cadmus_core/view/reader/

mod.rs

mod bottom_bar;
mod chapter_label;
mod margin_cropper;
mod results_bar;
mod results_label;
mod tool_bar;

use self::bottom_bar::BottomBar;
use self::margin_cropper::{MarginCropper, BUTTON_DIAMETER};
use self::results_bar::ResultsBar;
use self::tool_bar::ToolBar;
use super::top_bar::{TopBar, TopBarVariant};
use crate::color::{BLACK, WHITE};
use crate::context::Context;
use crate::device::CURRENT_DEVICE;
use crate::document::epub::EpubDocumentStatic;
use crate::document::html::HtmlDocument;
use crate::document::{
    annotations_as_html, bookmarks_as_html, toc_as_html, SimpleTocEntry, TocEntry, TocLocation,
};
use crate::document::{
    open, BoundedText, Document, Location, Neighbors, TextLocation, BYTES_PER_PAGE,
};
use crate::font::family_names;
use crate::font::Fonts;
use crate::framebuffer::{Framebuffer, Pixmap, UpdateMode};
use crate::frontlight::LightLevels;
use crate::geom::{halves, Axis, CycleDir, DiagDir, Dir, LinearDir, Region};
use crate::geom::{BorderSpec, Boundary, CornerSpec, Point, Rectangle, Vec2};
use crate::gesture::GestureEvent;
use crate::helpers::AsciiExtension;
use crate::input::{ButtonCode, ButtonStatus, DeviceEvent, FingerStatus};
use crate::metadata::{make_query, CroppingMargins, Margin};
use crate::metadata::{
    Annotation, FileInfo, Info, PageScheme, ReaderInfo, ScrollMode, TextAlign, ZoomMode,
};
use crate::metadata::{DEFAULT_CONTRAST_EXPONENT, DEFAULT_CONTRAST_GRAY};
use crate::settings::{
    guess_frontlight, BottomRightGestureAction, EastStripAction, FinishedAction,
    SouthEastCornerAction, SouthStripAction, WestStripAction,
};
use crate::settings::{
    DEFAULT_FONT_FAMILY, DEFAULT_LINE_HEIGHT, DEFAULT_MARGIN_WIDTH, DEFAULT_TEXT_ALIGN,
};
use crate::settings::{HYPHEN_PENALTY, STRETCH_TOLERANCE};
use crate::unit::{mm_to_px, scale_by_dpi};
use crate::view::common::{locate, locate_by_id, rlocate};
use crate::view::common::{toggle_battery_menu, toggle_clock_menu, toggle_main_menu};
use crate::view::filler::Filler;
use crate::view::keyboard::Keyboard;
use crate::view::menu::{Menu, MenuKind};
use crate::view::menu_entry::MenuEntry;
use crate::view::named_input::NamedInput;
use crate::view::notification::Notification;
use crate::view::search_bar::SearchBar;
use crate::view::{AppCmd, Bus, Event, Hub, RenderData, RenderQueue, ToggleEvent, View};
use crate::view::{EntryId, EntryKind, Id, SliderId, ViewId, ID_FEEDER};
use crate::view::{BIG_BAR_HEIGHT, SMALL_BAR_HEIGHT, THICKNESS_MEDIUM};
use chrono::Local;
use fxhash::{FxHashMap, FxHashSet};
use rand_core::Rng;
use regex::Regex;
use septem::prelude::*;
use septem::{Digit, Roman};
use std::collections::{BTreeMap, VecDeque};
use std::fs::OpenOptions;
use std::io::prelude::*;
use std::path::PathBuf;
use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering as AtomicOrdering;
use std::sync::{Arc, Mutex};
use std::thread;
use tracing::{debug, error, info, warn};

const HISTORY_SIZE: usize = 32;
const RECT_DIST_JITTER: f32 = 24.0;
const ANNOTATION_DRIFT: u8 = 0x44;
const HIGHLIGHT_DRIFT: u8 = 0x22;
const MEM_SCHEME: &str = "mem:";

pub struct Reader {
    id: Id,
    rect: Rectangle,
    children: Vec<Box<dyn View>>,
    doc: Arc<Mutex<Box<dyn Document>>>,
    cache: BTreeMap<usize, Resource>,         // Cached page pixmaps.
    chunks: Vec<RenderChunk>,                 // Chunks of pages being rendered.
    text: FxHashMap<usize, Vec<BoundedText>>, // Text of the current chunks.
    annotations: FxHashMap<usize, Vec<Annotation>>, // Annotations for the current chunks.
    noninverted_regions: FxHashMap<usize, Vec<Boundary>>,
    focus: Option<ViewId>,
    search: Option<Search>,
    search_direction: LinearDir,
    held_buttons: FxHashSet<ButtonCode>,
    selection: Option<Selection>,
    target_annotation: Option<[TextLocation; 2]>,
    history: VecDeque<usize>,
    state: State,
    info: Info,
    current_page: usize,
    pages_count: usize,
    view_port: ViewPort,
    contrast: Contrast,
    synthetic: bool,
    page_turns: usize,
    reflowable: bool,
    ephemeral: bool,
    finished: bool,
}

struct ViewPort {
    zoom_mode: ZoomMode,
    scroll_mode: ScrollMode,
    page_offset: Point, // Offset relative to the top left corner of a resource's frame.
    margin_width: i32,
}

impl Default for ViewPort {
    fn default() -> Self {
        ViewPort {
            zoom_mode: ZoomMode::FitToPage,
            scroll_mode: ScrollMode::Screen,
            page_offset: pt!(0, 0),
            margin_width: 0,
        }
    }
}

#[derive(Debug, Copy, Clone, Eq, PartialEq)]
enum State {
    Idle,
    Selection(i32),
    AdjustSelection,
}

struct Selection {
    start: TextLocation,
    end: TextLocation,
    anchor: TextLocation,
}

struct Resource {
    pixmap: Pixmap,
    frame: Rectangle, // The pixmap's rectangle minus the cropping margins.
    scale: f32,
}

#[derive(Debug, Clone)]
struct RenderChunk {
    location: usize,
    frame: Rectangle, // A subrectangle of the corresponding resource's frame.
    position: Point,
    scale: f32,
}

struct Search {
    query: String,
    highlights: BTreeMap<usize, Vec<Vec<Boundary>>>,
    running: Arc<AtomicBool>,
    current_page: usize,
    results_count: usize,
}

impl Default for Search {
    fn default() -> Self {
        Search {
            query: String::new(),
            highlights: BTreeMap::new(),
            running: Arc::new(AtomicBool::new(true)),
            current_page: 0,
            results_count: 0,
        }
    }
}

struct Contrast {
    exponent: f32,
    gray: f32,
}

impl Default for Contrast {
    fn default() -> Contrast {
        Contrast {
            exponent: DEFAULT_CONTRAST_EXPONENT,
            gray: DEFAULT_CONTRAST_GRAY,
        }
    }
}

fn scaling_factor(
    rect: &Rectangle,
    cropping_margin: &Margin,
    screen_margin_width: i32,
    dims: (f32, f32),
    zoom_mode: ZoomMode,
) -> f32 {
    if let ZoomMode::Custom(sf) = zoom_mode {
        return sf;
    }

    let (page_width, page_height) = dims;
    let surface_width = (rect.width() as i32 - 2 * screen_margin_width) as f32;
    let frame_width = (1.0 - (cropping_margin.left + cropping_margin.right)) * page_width;
    let width_ratio = surface_width / frame_width;
    match zoom_mode {
        ZoomMode::FitToPage => {
            let surface_height = (rect.height() as i32 - 2 * screen_margin_width) as f32;
            let frame_height = (1.0 - (cropping_margin.top + cropping_margin.bottom)) * page_height;
            let height_ratio = surface_height / frame_height;
            width_ratio.min(height_ratio)
        }
        ZoomMode::FitToWidth => width_ratio,
        ZoomMode::Custom(_) => unreachable!(),
    }
}

fn build_pixmap(rect: &Rectangle, doc: &mut dyn Document, location: usize) -> (Pixmap, usize) {
    let scale = scaling_factor(
        rect,
        &Margin::default(),
        0,
        doc.dims(location).unwrap(),
        ZoomMode::FitToPage,
    );
    doc.pixmap(
        Location::Exact(location),
        scale,
        CURRENT_DEVICE.color_samples(),
    )
    .unwrap()
}

fn find_cut(
    frame: &Rectangle,
    y_pos: i32,
    scale: f32,
    dir: LinearDir,
    lines: &[BoundedText],
) -> Option<i32> {
    let y_pos_u = y_pos as f32 / scale;
    let frame_u = frame.to_boundary() / scale;
    let mut rect_a: Option<Boundary> = None;
    let max_line_height = frame_u.height() / 10.0;

    for line in lines {
        if frame_u.contains(&line.rect)
            && line.rect.height() <= max_line_height
            && y_pos_u >= line.rect.min.y
            && y_pos_u < line.rect.max.y
        {
            rect_a = Some(line.rect);
            break;
        }
    }

    rect_a.map(|ra| {
        if dir == LinearDir::Backward {
            (scale * ra.min.y).floor() as i32
        } else {
            (scale * ra.max.y).ceil() as i32
        }
    })
}

fn word_separator(lang: &str) -> &'static str {
    let l = lang.to_ascii_lowercase();
    match l.as_str() {
        // https://en.wikipedia.org/wiki/Scriptio_continua
        // Japanese, Chinese, Burmese, Lao, Khmer, Thai, Bengali, Javanese, Sundanese.
        "ja" | "zh" | "my" | "lo" | "km" | "th" | "bn" | "jv" | "su" => "",
        _ => " ",
    }
}

impl Reader {
    pub fn new(
        rect: Rectangle,
        mut info: Info,
        hub: &Hub,
        context: &mut Context,
    ) -> Option<Reader> {
        let id = ID_FEEDER.next();
        let settings = &context.settings;
        let path = if !info.file.absolute_path.as_os_str().is_empty() {
            info.file.absolute_path.clone()
        } else {
            context.library.home.join(&info.file.path)
        };

        debug!(
            resolved_path = %path.display(),
            file_exists = path.exists(),
            "Opening document"
        );

        let doc = open(&path);
        if doc.is_none() {
            warn!(
                resolved_path = %path.display(),
                file_exists = path.exists(),
                "Failed to open document: open() returned None"
            );
        }
        doc.and_then(|mut doc| {
            let (width, height) = context.display.dims;
            let font_size = info
                .reader
                .as_ref()
                .and_then(|r| r.font_size)
                .unwrap_or(settings.reader.font_size);

            doc.layout(width, height, font_size, CURRENT_DEVICE.dpi);

            let margin_width = info
                .reader
                .as_ref()
                .and_then(|r| r.margin_width)
                .unwrap_or(settings.reader.margin_width);

            if margin_width != DEFAULT_MARGIN_WIDTH {
                doc.set_margin_width(margin_width);
            }

            let font_family = info
                .reader
                .as_ref()
                .and_then(|r| r.font_family.as_ref())
                .unwrap_or(&settings.reader.font_family);

            if font_family != DEFAULT_FONT_FAMILY {
                doc.set_font_family(font_family, &settings.reader.font_path);
            }

            let line_height = info
                .reader
                .as_ref()
                .and_then(|r| r.line_height)
                .unwrap_or(settings.reader.line_height);

            if (line_height - DEFAULT_LINE_HEIGHT).abs() > f32::EPSILON {
                doc.set_line_height(line_height);
            }

            let text_align = info
                .reader
                .as_ref()
                .and_then(|r| r.text_align)
                .unwrap_or(settings.reader.text_align);

            if text_align != DEFAULT_TEXT_ALIGN {
                doc.set_text_align(text_align);
            }

            let hyphen_penalty = settings.reader.paragraph_breaker.hyphen_penalty;

            if hyphen_penalty != HYPHEN_PENALTY {
                doc.set_hyphen_penalty(hyphen_penalty);
            }

            let stretch_tolerance = settings.reader.paragraph_breaker.stretch_tolerance;

            if stretch_tolerance != STRETCH_TOLERANCE {
                doc.set_stretch_tolerance(stretch_tolerance);
            }

            if settings.reader.ignore_document_css {
                doc.set_ignore_document_css(true);
            }

            let first_location = doc.resolve_location(Location::Exact(0));
            if first_location.is_none() {
                warn!(
                    resolved_path = %path.display(),
                    "Document opened but resolve_location(Exact(0)) returned None"
                );
            }
            let first_location = first_location?;

            let mut view_port = ViewPort::default();
            let mut contrast = Contrast::default();
            let pages_count = doc.pages_count();
            let current_page;

            // TODO: use get_or_insert_with?
            if let Some(ref mut r) = info.reader {
                r.opened = Local::now().naive_local();

                if r.finished {
                    r.finished = false;
                    r.current_page = first_location;
                    r.page_offset = None;
                }

                current_page = doc
                    .resolve_location(Location::Exact(r.current_page))
                    .unwrap_or(first_location);

                if let Some(zoom_mode) = r.zoom_mode {
                    view_port.zoom_mode = zoom_mode;
                }

                if let Some(scroll_mode) = r.scroll_mode {
                    view_port.scroll_mode = scroll_mode;
                } else {
                    view_port.scroll_mode = if settings.reader.continuous_fit_to_width {
                        ScrollMode::Screen
                    } else {
                        ScrollMode::Page
                    };
                }

                if let Some(page_offset) = r.page_offset {
                    view_port.page_offset = page_offset;
                }

                if !doc.is_reflowable() {
                    view_port.margin_width = mm_to_px(
                        r.screen_margin_width.unwrap_or(0) as f32,
                        CURRENT_DEVICE.dpi,
                    ) as i32;
                }

                if let Some(exponent) = r.contrast_exponent {
                    contrast.exponent = exponent;
                }

                if let Some(gray) = r.contrast_gray {
                    contrast.gray = gray;
                }
            } else {
                current_page = first_location;

                info.reader = Some(ReaderInfo {
                    current_page,
                    pages_count,
                    ..Default::default()
                });
            }

            let synthetic = doc.has_synthetic_page_numbers();
            let reflowable = doc.is_reflowable();

            if info.toc.is_none() {
                if let Some(toc) = doc.toc() {
                    let simple_toc: Vec<SimpleTocEntry> =
                        toc.iter().map(SimpleTocEntry::from).collect();
                    context
                        .library
                        .sync_toc(&info.file.path, simple_toc.clone());
                    info.toc = Some(simple_toc);
                }
            }

            info!("{}", info.file.path.display());

            hub.send(Event::Update(UpdateMode::Partial)).ok();

            Some(Reader {
                id,
                rect,
                children: Vec::new(),
                doc: Arc::new(Mutex::new(doc)),
                cache: BTreeMap::new(),
                chunks: Vec::new(),
                text: FxHashMap::default(),
                annotations: FxHashMap::default(),
                noninverted_regions: FxHashMap::default(),
                focus: None,
                search: None,
                search_direction: LinearDir::Forward,
                held_buttons: FxHashSet::default(),
                selection: None,
                target_annotation: None,
                history: VecDeque::new(),
                state: State::Idle,
                info,
                current_page,
                pages_count,
                view_port,
                synthetic,
                page_turns: 0,
                contrast,
                ephemeral: false,
                reflowable,
                finished: false,
            })
        })
    }

    pub fn from_html(
        rect: Rectangle,
        html: &str,
        link_uri: Option<&str>,
        hub: &Hub,
        context: &mut Context,
    ) -> Reader {
        let id = ID_FEEDER.next();

        let mut info = Info {
            file: FileInfo {
                path: PathBuf::from(MEM_SCHEME),
                kind: "html".to_string(),
                size: html.len() as u64,
                ..Default::default()
            },
            ..Default::default()
        };

        let mut doc = HtmlDocument::new_from_memory(html);
        let (width, height) = context.display.dims;
        let font_size = context.settings.reader.font_size;
        doc.layout(width, height, font_size, CURRENT_DEVICE.dpi);
        let pages_count = doc.pages_count();
        info.title = doc.title().unwrap_or_default();

        let mut current_page = 0;
        if let Some(link_uri) = link_uri {
            let mut loc = Location::Exact(0);
            while let Some((links, offset)) = doc.links(loc) {
                if links.iter().any(|link| link.text == link_uri) {
                    current_page = offset;
                    break;
                }
                loc = Location::Next(offset);
            }
        }

        hub.send(Event::Update(UpdateMode::Partial)).ok();

        Reader {
            id,
            rect,
            children: Vec::new(),
            doc: Arc::new(Mutex::new(Box::new(doc))),
            cache: BTreeMap::new(),
            chunks: Vec::new(),
            text: FxHashMap::default(),
            annotations: FxHashMap::default(),
            noninverted_regions: FxHashMap::default(),
            focus: None,
            search: None,
            search_direction: LinearDir::Forward,
            held_buttons: FxHashSet::default(),
            selection: None,
            target_annotation: None,
            history: VecDeque::new(),
            state: State::Idle,
            info,
            current_page,
            pages_count,
            view_port: ViewPort::default(),
            synthetic: true,
            page_turns: 0,
            contrast: Contrast::default(),
            ephemeral: true,
            reflowable: true,
            finished: false,
        }
    }

    #[cfg_attr(feature = "tracing", tracing::instrument(skip_all))]
    pub fn from_embedded_epub(
        rect: Rectangle,
        epub_bytes: &'static [u8],
        hub: &Hub,
        context: &mut Context,
    ) -> Option<Reader> {
        let id = ID_FEEDER.next();

        let mut doc = EpubDocumentStatic::new_from_static(epub_bytes).ok()?;

        let info = Info {
            file: FileInfo {
                path: PathBuf::from("mem:documentation.epub"),
                kind: "epub".to_string(),
                size: epub_bytes.len() as u64,
                ..Default::default()
            },
            title: doc.title().unwrap_or_default(),
            ..Default::default()
        };

        let (width, height) = context.display.dims;
        doc.layout(width, height, 7.0, CURRENT_DEVICE.dpi);
        doc.set_margin_width(mm_to_px(0.0, CURRENT_DEVICE.dpi) as i32);
        let pages_count = doc.pages_count();

        hub.send(Event::Update(UpdateMode::Partial)).ok();

        Some(Reader {
            id,
            rect,
            children: Vec::new(),
            doc: Arc::new(Mutex::new(Box::new(doc))),
            cache: BTreeMap::new(),
            chunks: Vec::new(),
            text: FxHashMap::default(),
            annotations: FxHashMap::default(),
            noninverted_regions: FxHashMap::default(),
            focus: None,
            search: None,
            search_direction: LinearDir::Forward,
            held_buttons: FxHashSet::default(),
            selection: None,
            target_annotation: None,
            history: VecDeque::new(),
            state: State::Idle,
            info,
            current_page: 0,
            pages_count,
            view_port: ViewPort::default(),
            synthetic: true,
            page_turns: 0,
            contrast: Contrast::default(),
            ephemeral: true,
            reflowable: true,
            finished: false,
        })
    }

    fn load_pixmap(&mut self, location: usize) {
        if self.cache.contains_key(&location) {
            return;
        }

        let mut doc = self.doc.lock().unwrap();
        let cropping_margin = self
            .info
            .reader
            .as_ref()
            .and_then(|r| r.cropping_margins.as_ref().map(|c| c.margin(location)))
            .cloned()
            .unwrap_or_default();
        let dims = doc.dims(location).unwrap_or((3.0, 4.0));
        let screen_margin_width = self.view_port.margin_width;
        let scale = scaling_factor(
            &self.rect,
            &cropping_margin,
            screen_margin_width,
            dims,
            self.view_port.zoom_mode,
        );
        if let Some((pixmap, _)) = doc.pixmap(
            Location::Exact(location),
            scale,
            CURRENT_DEVICE.color_samples(),
        ) {
            let frame = rect![
                (cropping_margin.left * pixmap.width as f32).ceil() as i32,
                (cropping_margin.top * pixmap.height as f32).ceil() as i32,
                ((1.0 - cropping_margin.right) * pixmap.width as f32).floor() as i32,
                ((1.0 - cropping_margin.bottom) * pixmap.height as f32).floor() as i32
            ];
            self.cache.insert(
                location,
                Resource {
                    pixmap,
                    frame,
                    scale,
                },
            );
        } else {
            let width = (dims.0 as f32 * scale).max(1.0) as u32;
            let height = (dims.1 as f32 * scale).max(1.0) as u32;
            let pixmap = Pixmap::empty(width, height, CURRENT_DEVICE.color_samples());
            let frame = pixmap.rect();
            self.cache.insert(
                location,
                Resource {
                    pixmap,
                    frame,
                    scale,
                },
            );
        }
    }

    fn load_text(&mut self, location: usize) {
        if self.text.contains_key(&location) {
            return;
        }

        let mut doc = self.doc.lock().unwrap();
        let loc = Location::Exact(location);
        let words = doc.words(loc).map(|(words, _)| words).unwrap_or_default();
        self.text.insert(location, words);
    }

    fn go_to_page(
        &mut self,
        location: usize,
        record: bool,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        let loc = {
            let mut doc = self.doc.lock().unwrap();
            doc.resolve_location(Location::Exact(location))
        };

        if let Some(location) = loc {
            if record {
                self.history.push_back(self.current_page);
                if self.history.len() > HISTORY_SIZE {
                    self.history.pop_front();
                }
            }

            if let Some(ref mut s) = self.search {
                s.current_page = s.highlights.range(..=location).count().saturating_sub(1);
            }

            self.current_page = location;
            self.view_port.page_offset = pt!(0);
            self.selection = None;
            self.state = State::Idle;
            self.update(None, hub, rq, context);
            self.update_bottom_bar(rq);

            if self.search.is_some() {
                self.update_results_bar(rq);
            }
        }
    }

    fn go_to_chapter(&mut self, dir: CycleDir, hub: &Hub, rq: &mut RenderQueue, context: &Context) {
        let current_page = self.current_page;
        let loc = {
            let mut doc = self.doc.lock().unwrap();
            if let Some(toc) = self.toc().or_else(|| doc.toc()) {
                let chap_offset = if dir == CycleDir::Previous {
                    doc.chapter(current_page, &toc)
                        .and_then(|(chap, _)| doc.resolve_location(chap.location.clone()))
                        .and_then(|chap_offset| {
                            if chap_offset < current_page {
                                Some(chap_offset)
                            } else {
                                None
                            }
                        })
                } else {
                    None
                };
                chap_offset.or_else(|| {
                    doc.chapter_relative(current_page, dir, &toc)
                        .and_then(|rel_chap| doc.resolve_location(rel_chap.location.clone()))
                })
            } else {
                None
            }
        };
        if let Some(location) = loc {
            self.go_to_page(location, true, hub, rq, context);
        }
    }

    fn text_location_range(&self) -> Option<[TextLocation; 2]> {
        let mut min_loc = None;
        let mut max_loc = None;
        for chunk in &self.chunks {
            for word in &self.text[&chunk.location] {
                let rect = (word.rect * chunk.scale).to_rect();
                if rect.overlaps(&chunk.frame) {
                    if let Some(ref mut min) = min_loc {
                        if word.location < *min {
                            *min = word.location;
                        }
                    } else {
                        min_loc = Some(word.location);
                    }
                    if let Some(ref mut max) = max_loc {
                        if word.location > *max {
                            *max = word.location;
                        }
                    } else {
                        max_loc = Some(word.location);
                    }
                }
            }
        }

        min_loc.and_then(|min| max_loc.map(|max| [min, max]))
    }

    fn go_to_bookmark(
        &mut self,
        dir: CycleDir,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        let loc_bkm = self.info.reader.as_ref().and_then(|r| match dir {
            CycleDir::Next => r.bookmarks.range(self.current_page + 1..).next().cloned(),
            CycleDir::Previous => r.bookmarks.range(..self.current_page).next_back().cloned(),
        });

        if let Some(location) = loc_bkm {
            self.go_to_page(location, true, hub, rq, context);
        }
    }

    fn go_to_annotation(
        &mut self,
        dir: CycleDir,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        let loc_annot = self.info.reader.as_ref().and_then(|r| match dir {
            CycleDir::Next => self.text_location_range().and_then(|[_, max]| {
                r.annotations
                    .iter()
                    .filter(|annot| annot.selection[0] > max)
                    .map(|annot| annot.selection[0])
                    .min()
                    .map(|tl| tl.location())
            }),
            CycleDir::Previous => self.text_location_range().and_then(|[min, _]| {
                r.annotations
                    .iter()
                    .filter(|annot| annot.selection[1] < min)
                    .map(|annot| annot.selection[1])
                    .max()
                    .map(|tl| tl.location())
            }),
        });

        if let Some(location) = loc_annot {
            self.go_to_page(location, true, hub, rq, context);
        }
    }

    fn go_to_last_page(&mut self, hub: &Hub, rq: &mut RenderQueue, context: &Context) {
        if let Some(location) = self.history.pop_back() {
            self.go_to_page(location, false, hub, rq, context);
        }
    }

    fn vertical_scroll(
        &mut self,
        delta_y: i32,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if delta_y == 0 || self.view_port.zoom_mode == ZoomMode::FitToPage || self.cache.is_empty()
        {
            return;
        }

        let mut next_top_offset = self.view_port.page_offset.y + delta_y;
        let mut location = self.current_page;

        match self.view_port.scroll_mode {
            ScrollMode::Screen => {
                let max_top_offset = self.cache[&location].frame.height().saturating_sub(1) as i32;

                if next_top_offset < 0 {
                    let mut doc = self.doc.lock().unwrap();
                    if let Some(previous_location) =
                        doc.resolve_location(Location::Previous(location))
                    {
                        if !self.cache.contains_key(&previous_location) {
                            return;
                        }
                        location = previous_location;
                        let frame = self.cache[&location].frame;
                        next_top_offset = (frame.height() as i32 + next_top_offset).max(0);
                    } else {
                        next_top_offset = 0;
                    }
                } else if next_top_offset > max_top_offset {
                    let mut doc = self.doc.lock().unwrap();
                    if let Some(next_location) = doc.resolve_location(Location::Next(location)) {
                        if !self.cache.contains_key(&next_location) {
                            return;
                        }
                        location = next_location;
                        let frame = self.cache[&location].frame;
                        let mto = frame.height().saturating_sub(1) as i32;
                        next_top_offset = (next_top_offset - max_top_offset - 1).min(mto);
                    } else {
                        next_top_offset = max_top_offset;
                    }
                }

                {
                    let Resource { frame, scale, .. } = *self.cache.get(&location).unwrap();
                    let mut doc = self.doc.lock().unwrap();
                    if let Some((lines, _)) = doc.lines(Location::Exact(location)) {
                        if let Some(mut y_pos) = find_cut(
                            &frame,
                            frame.min.y + next_top_offset,
                            scale,
                            LinearDir::Forward,
                            &lines,
                        ) {
                            y_pos = y_pos.clamp(frame.min.y, frame.max.y - 1);
                            next_top_offset = y_pos - frame.min.y;
                        }
                    }
                }
            }
            ScrollMode::Page => {
                let frame_height = self.cache[&location].frame.height() as i32;
                let available_height = self.rect.height() as i32 - 2 * self.view_port.margin_width;
                if frame_height > available_height {
                    next_top_offset = next_top_offset.max(0).min(frame_height - available_height);
                } else {
                    next_top_offset = self.view_port.page_offset.y;
                }
            }
        }

        let location_changed = location != self.current_page;
        if !location_changed && next_top_offset == self.view_port.page_offset.y {
            return;
        }

        self.view_port.page_offset.y = next_top_offset;
        self.current_page = location;
        self.update(None, hub, rq, context);

        if location_changed {
            if let Some(ref mut s) = self.search {
                s.current_page = s.highlights.range(..=location).count().saturating_sub(1);
            }
            self.update_bottom_bar(rq);
            if self.search.is_some() {
                self.update_results_bar(rq);
            }
        }
    }

    fn directional_scroll(
        &mut self,
        delta: Point,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if delta == pt!(0) || self.cache.is_empty() {
            return;
        }

        let Resource { frame, .. } = self.cache[&self.current_page];
        let next_page_offset = self.view_port.page_offset + delta;
        let vpw = self.rect.width() as i32 - 2 * self.view_port.margin_width;
        let vph = self.rect.height() as i32 - 2 * self.view_port.margin_width;
        let vprect = rect![pt!(0), pt!(vpw, vph)] + next_page_offset + frame.min;

        if vprect.overlaps(&frame) {
            self.view_port.page_offset = next_page_offset;
            self.update(None, hub, rq, context);
        }
    }

    fn go_to_neighbor(
        &mut self,
        dir: CycleDir,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if self.chunks.is_empty() {
            return;
        }

        let current_page = self.current_page;
        let page_offset = self.view_port.page_offset;

        let loc = {
            let neighloc = match dir {
                CycleDir::Previous => match self.view_port.zoom_mode {
                    ZoomMode::FitToPage => Location::Previous(current_page),
                    ZoomMode::FitToWidth => match self.view_port.scroll_mode {
                        ScrollMode::Screen => {
                            let first_chunk = self.chunks.first().cloned().unwrap();
                            let mut location = first_chunk.location;
                            let available_height =
                                self.rect.height() as i32 - 2 * self.view_port.margin_width;
                            let mut height = 0;

                            loop {
                                self.load_pixmap(location);
                                self.load_text(location);
                                let Resource { mut frame, .. } = self.cache[&location];
                                if location == first_chunk.location {
                                    frame.max.y = first_chunk.frame.min.y;
                                }
                                height += frame.height() as i32;
                                if height >= available_height {
                                    break;
                                }
                                let mut doc = self.doc.lock().unwrap();
                                if let Some(previous_location) =
                                    doc.resolve_location(Location::Previous(location))
                                {
                                    location = previous_location;
                                } else {
                                    break;
                                }
                            }

                            let mut next_top_offset = (height - available_height).max(0);
                            if height > available_height {
                                let Resource { frame, scale, .. } = self.cache[&location];
                                let mut doc = self.doc.lock().unwrap();
                                if let Some((lines, _)) = doc.lines(Location::Exact(location)) {
                                    if let Some(mut y_pos) = find_cut(
                                        &frame,
                                        frame.min.y + next_top_offset,
                                        scale,
                                        LinearDir::Forward,
                                        &lines,
                                    ) {
                                        y_pos = y_pos.clamp(frame.min.y, frame.max.y - 1);
                                        next_top_offset = y_pos - frame.min.y;
                                    }
                                }
                            }

                            self.view_port.page_offset.y = next_top_offset;
                            Location::Exact(location)
                        }
                        ScrollMode::Page => {
                            let available_height =
                                self.rect.height() as i32 - 2 * self.view_port.margin_width;
                            if self.view_port.page_offset.y > 0 {
                                self.view_port.page_offset.y =
                                    (self.view_port.page_offset.y - available_height).max(0);
                                Location::Exact(current_page)
                            } else {
                                let previous_location = self
                                    .doc
                                    .lock()
                                    .unwrap()
                                    .resolve_location(Location::Previous(current_page));
                                if let Some(location) = previous_location {
                                    self.load_pixmap(location);
                                    let frame = self.cache[&location].frame;
                                    self.view_port.page_offset.y =
                                        (frame.height() as i32 - available_height).max(0);
                                }
                                Location::Previous(current_page)
                            }
                        }
                    },
                    ZoomMode::Custom(_) => {
                        self.view_port.page_offset = pt!(0);
                        Location::Previous(current_page)
                    }
                },
                CycleDir::Next => match self.view_port.zoom_mode {
                    ZoomMode::FitToPage => Location::Next(current_page),
                    ZoomMode::FitToWidth => match self.view_port.scroll_mode {
                        ScrollMode::Screen => {
                            let &RenderChunk {
                                location, frame, ..
                            } = self.chunks.last().unwrap();
                            self.load_pixmap(location);
                            self.load_text(location);
                            let pixmap_frame = self.cache[&location].frame;
                            let next_top_offset = frame.max.y - pixmap_frame.min.y;
                            if next_top_offset == pixmap_frame.height() as i32 {
                                self.view_port.page_offset.y = 0;
                                Location::Next(location)
                            } else {
                                self.view_port.page_offset.y = next_top_offset;
                                Location::Exact(location)
                            }
                        }
                        ScrollMode::Page => {
                            let available_height =
                                self.rect.height() as i32 - 2 * self.view_port.margin_width;
                            let frame_height = self.cache[&current_page].frame.height() as i32;
                            let next_top_offset = self.view_port.page_offset.y + available_height;
                            if frame_height < available_height || next_top_offset == frame_height {
                                self.view_port.page_offset.y = 0;
                                Location::Next(current_page)
                            } else {
                                self.view_port.page_offset.y =
                                    next_top_offset.min(frame_height - available_height);
                                Location::Exact(current_page)
                            }
                        }
                    },
                    ZoomMode::Custom(_) => {
                        self.view_port.page_offset = pt!(0);
                        Location::Next(current_page)
                    }
                },
            };
            let mut doc = self.doc.lock().unwrap();
            doc.resolve_location(neighloc)
        };
        match loc {
            Some(location)
                if location != current_page || self.view_port.page_offset != page_offset =>
            {
                if let Some(ref mut s) = self.search {
                    s.current_page = s.highlights.range(..=location).count().saturating_sub(1);
                }

                self.current_page = location;
                self.selection = None;
                self.state = State::Idle;
                self.update(None, hub, rq, context);
                self.update_bottom_bar(rq);

                if self.search.is_some() {
                    self.update_results_bar(rq);
                }
            }
            _ => match dir {
                CycleDir::Next => {
                    self.finished = true;
                    let action = if self.ephemeral {
                        FinishedAction::Notify
                    } else {
                        context
                            .settings
                            .libraries
                            .get(context.settings.selected_library)
                            .and_then(|lib| lib.finished)
                            .unwrap_or(context.settings.reader.finished)
                    };
                    match action {
                        FinishedAction::Notify => {
                            let notif = Notification::new(
                                None,
                                "No next page.".to_string(),
                                false,
                                hub,
                                rq,
                                context,
                            );
                            self.children.push(Box::new(notif) as Box<dyn View>);
                        }
                        FinishedAction::Close => {
                            self.quit(context);
                            hub.send(Event::Back).ok();
                        }
                        FinishedAction::GoToNext => {
                            let next = self
                                .info
                                .fp
                                .and_then(|fp| context.library.next_book_after(fp));

                            self.quit(context);

                            match next {
                                Some(next_info) => {
                                    hub.send(Event::Open(Box::new(next_info))).ok();
                                }
                                None => {
                                    hub.send(Event::Back).ok();
                                }
                            }
                        }
                    }
                }
                CycleDir::Previous => {
                    let notif = Notification::new(
                        None,
                        "No previous page.".to_string(),
                        false,
                        hub,
                        rq,
                        context,
                    );
                    self.children.push(Box::new(notif) as Box<dyn View>);
                }
            },
        }
    }

    fn go_to_results_page(
        &mut self,
        index: usize,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        let mut loc = None;
        if let Some(ref mut s) = self.search {
            if index < s.highlights.len() {
                s.current_page = index;
                loc = Some(*s.highlights.keys().nth(index).unwrap());
            }
        }
        if let Some(location) = loc {
            self.current_page = location;
            self.view_port.page_offset = pt!(0, 0);
            self.selection = None;
            self.state = State::Idle;
            self.update_results_bar(rq);
            self.update_bottom_bar(rq);
            self.update(None, hub, rq, context);
        }
    }

    fn go_to_results_neighbor(
        &mut self,
        dir: CycleDir,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        let loc = self.search.as_ref().and_then(|s| match dir {
            CycleDir::Next => s
                .highlights
                .range(self.current_page + 1..)
                .next()
                .map(|e| *e.0),
            CycleDir::Previous => s
                .highlights
                .range(..self.current_page)
                .next_back()
                .map(|e| *e.0),
        });
        if let Some(location) = loc {
            if let Some(ref mut s) = self.search {
                s.current_page = s.highlights.range(..=location).count().saturating_sub(1);
            }
            self.view_port.page_offset = pt!(0, 0);
            self.current_page = location;
            self.update_results_bar(rq);
            self.update_bottom_bar(rq);
            self.update(None, hub, rq, context);
        }
    }

    fn update_bottom_bar(&mut self, rq: &mut RenderQueue) {
        if let Some(index) = locate::<BottomBar>(self) {
            let current_page = self.current_page;
            let mut doc = self.doc.lock().unwrap();
            let rtoc = self.toc().or_else(|| doc.toc());
            let chapter = rtoc.as_ref().and_then(|toc| doc.chapter(current_page, toc));
            let title = chapter.map(|(c, _)| c.title.clone()).unwrap_or_default();
            let progress = chapter.map(|(_, p)| p).unwrap_or_default();
            let bottom_bar = self.children[index]
                .as_mut()
                .downcast_mut::<BottomBar>()
                .unwrap();
            let neighbors = Neighbors {
                previous_page: doc.resolve_location(Location::Previous(current_page)),
                next_page: doc.resolve_location(Location::Next(current_page)),
            };
            bottom_bar.update_chapter_label(title, progress, rq);
            bottom_bar.update_page_label(self.current_page, self.pages_count, rq);
            bottom_bar.update_icons(&neighbors, rq);
        }
    }

    fn update_tool_bar(&mut self, rq: &mut RenderQueue, context: &mut Context) {
        if let Some(index) = locate::<ToolBar>(self) {
            let tool_bar = self.children[index]
                .as_mut()
                .downcast_mut::<ToolBar>()
                .unwrap();
            let settings = &context.settings;
            if self.reflowable {
                let font_family = self
                    .info
                    .reader
                    .as_ref()
                    .and_then(|r| r.font_family.clone())
                    .unwrap_or_else(|| settings.reader.font_family.clone());
                tool_bar.update_font_family(font_family, rq);
                let font_size = self
                    .info
                    .reader
                    .as_ref()
                    .and_then(|r| r.font_size)
                    .unwrap_or(settings.reader.font_size);
                tool_bar.update_font_size_slider(font_size, rq);
                let text_align = self
                    .info
                    .reader
                    .as_ref()
                    .and_then(|r| r.text_align)
                    .unwrap_or(settings.reader.text_align);
                tool_bar.update_text_align_icon(text_align, rq);
                let line_height = self
                    .info
                    .reader
                    .as_ref()
                    .and_then(|r| r.line_height)
                    .unwrap_or(settings.reader.line_height);
                tool_bar.update_line_height(line_height, rq);
            } else {
                tool_bar.update_contrast_exponent_slider(self.contrast.exponent, rq);
                tool_bar.update_contrast_gray_slider(self.contrast.gray, rq);
            }
            let reflowable = self.reflowable;
            let margin_width = self
                .info
                .reader
                .as_ref()
                .and_then(|r| {
                    if reflowable {
                        r.margin_width
                    } else {
                        r.screen_margin_width
                    }
                })
                .unwrap_or_else(|| {
                    if reflowable {
                        settings.reader.margin_width
                    } else {
                        0
                    }
                });
            tool_bar.update_margin_width(margin_width, rq);
        }
    }

    fn update_results_bar(&mut self, rq: &mut RenderQueue) {
        if self.search.is_none() {
            return;
        }
        let (count, current_page, pages_count) = {
            let s = self.search.as_ref().unwrap();
            (s.results_count, s.current_page, s.highlights.len())
        };
        if let Some(index) = locate::<ResultsBar>(self) {
            let results_bar = self.child_mut(index).downcast_mut::<ResultsBar>().unwrap();
            results_bar.update_results_label(count, rq);
            results_bar.update_page_label(current_page, pages_count, rq);
            results_bar.update_icons(current_page, pages_count, rq);
        }
    }

    #[inline]
    fn update_noninverted_regions(&mut self, inverted: bool) {
        self.noninverted_regions.clear();
        if inverted {
            for chunk in &self.chunks {
                if let Some((images, _)) = self
                    .doc
                    .lock()
                    .unwrap()
                    .images(Location::Exact(chunk.location))
                {
                    self.noninverted_regions.insert(chunk.location, images);
                }
            }
        }
    }

    #[inline]
    fn update_annotations(&mut self) {
        self.annotations.clear();
        if let Some(annotations) = self
            .info
            .reader
            .as_ref()
            .map(|r| &r.annotations)
            .filter(|a| !a.is_empty())
        {
            for chunk in &self.chunks {
                let words = &self.text[&chunk.location];
                if words.is_empty() {
                    continue;
                }
                for annot in annotations {
                    let [start, end] = annot.selection;
                    if (start >= words[0].location && start <= words[words.len() - 1].location)
                        || (end >= words[0].location && end <= words[words.len() - 1].location)
                    {
                        self.annotations
                            .entry(chunk.location)
                            .or_insert_with(Vec::new)
                            .push(annot.clone());
                    }
                }
            }
        }
    }

    fn update(
        &mut self,
        update_mode: Option<UpdateMode>,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        self.page_turns += 1;
        let update_mode = update_mode.unwrap_or_else(|| {
            let pair = context
                .settings
                .reader
                .refresh_rate
                .by_kind
                .get(&self.info.file.kind)
                .unwrap_or_else(|| &context.settings.reader.refresh_rate.global);
            let refresh_rate = if context.fb.inverted() {
                pair.inverted
            } else {
                pair.regular
            };
            if refresh_rate == 0 || self.page_turns % (refresh_rate as usize) != 0 {
                UpdateMode::Partial
            } else {
                UpdateMode::Full
            }
        });

        self.chunks.clear();
        let mut location = self.current_page;
        let smw = self.view_port.margin_width;

        match self.view_port.zoom_mode {
            ZoomMode::FitToPage => {
                self.load_pixmap(location);
                self.load_text(location);
                let Resource { frame, scale, .. } = self.cache[&location];
                let dx = smw + ((self.rect.width() - frame.width()) as i32 - 2 * smw) / 2;
                let dy = smw + ((self.rect.height() - frame.height()) as i32 - 2 * smw) / 2;
                self.chunks.push(RenderChunk {
                    frame,
                    location,
                    position: pt!(dx, dy),
                    scale,
                });
            }
            ZoomMode::FitToWidth => match self.view_port.scroll_mode {
                ScrollMode::Screen => {
                    let available_height = self.rect.height() as i32 - 2 * smw;
                    let mut height = 0;
                    while height < available_height {
                        self.load_pixmap(location);
                        self.load_text(location);
                        let Resource {
                            mut frame, scale, ..
                        } = self.cache[&location];
                        if location == self.current_page {
                            frame.min.y += self.view_port.page_offset.y;
                        }
                        let position = pt!(smw, smw + height);
                        self.chunks.push(RenderChunk {
                            frame,
                            location,
                            position,
                            scale,
                        });
                        height += frame.height() as i32;
                        if let Ok(mut doc) = self.doc.lock() {
                            if let Some(next_location) =
                                doc.resolve_location(Location::Next(location))
                            {
                                location = next_location;
                            } else {
                                break;
                            }
                        }
                    }
                    if height > available_height {
                        if let Some(last_chunk) = self.chunks.last_mut() {
                            last_chunk.frame.max.y -= height - available_height;
                            let mut doc = self.doc.lock().unwrap();
                            if let Some((lines, _)) =
                                doc.lines(Location::Exact(last_chunk.location))
                            {
                                let pixmap_frame = self.cache[&last_chunk.location].frame;
                                if let Some(mut y_pos) = find_cut(
                                    &pixmap_frame,
                                    last_chunk.frame.max.y,
                                    last_chunk.scale,
                                    LinearDir::Backward,
                                    &lines,
                                ) {
                                    y_pos = y_pos.clamp(pixmap_frame.min.y, pixmap_frame.max.y - 1);
                                    last_chunk.frame.max.y = y_pos;
                                }
                            }
                        }
                        let actual_height: i32 =
                            self.chunks.iter().map(|c| c.frame.height() as i32).sum();
                        let dy = (available_height - actual_height) / 2;
                        for chunk in &mut self.chunks {
                            chunk.position.y += dy;
                        }
                    }
                }
                ScrollMode::Page => {
                    self.load_pixmap(location);
                    self.load_text(location);
                    let available_height = self.rect.height() as i32 - 2 * smw;
                    let Resource {
                        mut frame, scale, ..
                    } = self.cache[&location];
                    frame.min.y += self.view_port.page_offset.y;
                    frame.max.y = (frame.min.y + available_height).min(frame.max.y);
                    let position = pt!(smw, smw + (available_height - frame.height() as i32) / 2);
                    self.chunks.push(RenderChunk {
                        frame,
                        location,
                        position,
                        scale,
                    });
                }
            },
            ZoomMode::Custom(_) => {
                self.load_pixmap(location);
                self.load_text(location);
                let Resource { frame, scale, .. } = self.cache[&location];
                let vpw = self.rect.width() as i32 - 2 * smw;
                let vph = self.rect.height() as i32 - 2 * smw;
                let vpr = rect![pt!(0), pt!(vpw, vph)] + self.view_port.page_offset + frame.min;
                if let Some(rect) = frame.intersection(&vpr) {
                    let position = pt!(smw) + rect.min - vpr.min;
                    self.chunks.push(RenderChunk {
                        frame: rect,
                        location,
                        position,
                        scale,
                    });
                }
            }
        }

        rq.add(RenderData::new(self.id, self.rect, update_mode));
        let first_location = self.chunks.first().map(|c| c.location).unwrap();
        let last_location = self.chunks.last().map(|c| c.location).unwrap();

        while self.cache.len() > 3 {
            let left_count = self.cache.range(..first_location).count();
            let right_count = self.cache.range(last_location + 1..).count();
            let extremum = if left_count >= right_count {
                self.cache.keys().next().cloned().unwrap()
            } else {
                self.cache.keys().next_back().cloned().unwrap()
            };
            self.cache.remove(&extremum);
        }

        self.update_annotations();
        self.update_noninverted_regions(context.fb.inverted());

        if self.view_port.zoom_mode == ZoomMode::FitToPage
            || self.view_port.zoom_mode == ZoomMode::FitToWidth
        {
            let doc2 = self.doc.clone();
            let hub2 = hub.clone();
            thread::spawn(move || {
                let mut doc = doc2.lock().unwrap();
                if let Some(next_location) = doc.resolve_location(Location::Next(last_location)) {
                    hub2.send(Event::LoadPixmap(next_location)).ok();
                }
            });
            let doc3 = self.doc.clone();
            let hub3 = hub.clone();
            thread::spawn(move || {
                let mut doc = doc3.lock().unwrap();
                if let Some(previous_location) =
                    doc.resolve_location(Location::Previous(first_location))
                {
                    hub3.send(Event::LoadPixmap(previous_location)).ok();
                }
            });
        }
    }

    fn search(&mut self, text: &str, query: Regex, hub: &Hub, rq: &mut RenderQueue) {
        let s = Search {
            query: text.to_string(),
            ..Default::default()
        };

        let hub2 = hub.clone();
        let doc2 = Arc::clone(&self.doc);
        let running = Arc::clone(&s.running);
        let current_page = self.current_page;
        let search_direction = self.search_direction;
        let ws = word_separator(&self.info.language);

        thread::spawn(move || {
            let mut loc = Location::Exact(current_page);
            let mut started = false;

            loop {
                if !running.load(AtomicOrdering::Relaxed) {
                    break;
                }

                let mut doc = doc2.lock().unwrap();
                let mut text = String::new();
                let mut rects = BTreeMap::new();

                if let Some(location) = doc.resolve_location(loc) {
                    if location == current_page && started {
                        break;
                    }
                    if let Some((ref words, _)) = doc.words(Location::Exact(location)) {
                        for word in words {
                            if !running.load(AtomicOrdering::Relaxed) {
                                break;
                            }
                            if text.ends_with('\u{00AD}') {
                                text.pop();
                            } else if !text.ends_with('-') && !text.is_empty() {
                                text.push_str(ws);
                            }
                            rects.insert(text.len(), word.rect);
                            text += &word.text;
                        }
                        for m in query.find_iter(&text) {
                            if let Some((first, _)) = rects.range(..=m.start()).next_back() {
                                let mut match_rects = Vec::new();
                                for (_, rect) in rects.range(*first..m.end()) {
                                    match_rects.push(*rect);
                                }
                                hub2.send(Event::SearchResult(location, match_rects)).ok();
                            }
                        }
                    }
                    loc = match search_direction {
                        LinearDir::Forward => Location::Next(location),
                        LinearDir::Backward => Location::Previous(location),
                    };
                } else {
                    loc = match search_direction {
                        LinearDir::Forward => Location::Exact(0),
                        LinearDir::Backward => Location::Exact(doc.pages_count() - 1),
                    };
                }

                started = true;
            }

            running.store(false, AtomicOrdering::Relaxed);
            hub2.send(Event::EndOfSearch).ok();
        });

        if self.search.is_some() {
            self.render_results(rq);
        }

        self.search = Some(s);
    }

    fn toggle_keyboard(
        &mut self,
        enable: bool,
        id: Option<ViewId>,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate::<Keyboard>(self) {
            if enable {
                return;
            }

            let mut rect = *self.child(index).rect();
            rect.absorb(self.child(index - 1).rect());

            if index == 1 {
                rect.absorb(self.child(index + 1).rect());
                self.children.drain(index - 1..=index + 1);
                rq.add(RenderData::expose(rect, UpdateMode::Gui));
            } else {
                self.children.drain(index - 1..=index);

                let start_index = locate::<TopBar>(self).map(|index| index + 2).unwrap_or(0);
                let y_min = self.child(start_index).rect().min.y;
                let delta_y = rect.height() as i32;

                for i in start_index..index - 1 {
                    let shifted_rect = *self.child(i).rect() + pt!(0, delta_y);
                    self.child_mut(i).resize(shifted_rect, hub, rq, context);
                    rq.add(RenderData::new(
                        self.child(i).id(),
                        shifted_rect,
                        UpdateMode::Gui,
                    ));
                }

                let rect = rect![self.rect.min.x, y_min, self.rect.max.x, y_min + delta_y];
                rq.add(RenderData::expose(rect, UpdateMode::Gui));
            }

            context.kb_rect = Rectangle::default();
            hub.send(Event::Focus(None)).ok();
        } else {
            if !enable {
                return;
            }

            let dpi = CURRENT_DEVICE.dpi;
            let (small_height, big_height) = (
                scale_by_dpi(SMALL_BAR_HEIGHT, dpi) as i32,
                scale_by_dpi(BIG_BAR_HEIGHT, dpi) as i32,
            );
            let thickness = scale_by_dpi(THICKNESS_MEDIUM, dpi) as i32;
            let (small_thickness, big_thickness) = halves(thickness);

            let mut kb_rect = rect![
                self.rect.min.x,
                self.rect.max.y - (small_height + 3 * big_height) as i32 + big_thickness,
                self.rect.max.x,
                self.rect.max.y - small_height - small_thickness
            ];

            let number = matches!(
                id,
                Some(ViewId::GoToPageInput)
                    | Some(ViewId::GoToResultsPageInput)
                    | Some(ViewId::NamePageInput)
            );

            let index = rlocate::<Filler>(self).unwrap_or(0);

            if index == 0 {
                let separator = Filler::new(
                    rect![
                        self.rect.min.x,
                        kb_rect.max.y,
                        self.rect.max.x,
                        kb_rect.max.y + thickness
                    ],
                    BLACK,
                );
                self.children
                    .insert(index, Box::new(separator) as Box<dyn View>);
            }

            let keyboard = Keyboard::new(&mut kb_rect, number, context);
            self.children
                .insert(index, Box::new(keyboard) as Box<dyn View>);

            let separator = Filler::new(
                rect![
                    self.rect.min.x,
                    kb_rect.min.y - thickness,
                    self.rect.max.x,
                    kb_rect.min.y
                ],
                BLACK,
            );
            self.children
                .insert(index, Box::new(separator) as Box<dyn View>);

            if index == 0 {
                for i in index..index + 3 {
                    rq.add(RenderData::new(
                        self.child(i).id(),
                        *self.child(i).rect(),
                        UpdateMode::Gui,
                    ));
                }
            } else {
                for i in index..index + 2 {
                    rq.add(RenderData::new(
                        self.child(i).id(),
                        *self.child(i).rect(),
                        UpdateMode::Gui,
                    ));
                }

                let delta_y = kb_rect.height() as i32 + thickness;
                let start_index = locate::<TopBar>(self).map(|index| index + 2).unwrap_or(0);

                for i in start_index..index {
                    let shifted_rect = *self.child(i).rect() + pt!(0, -delta_y);
                    self.child_mut(i).resize(shifted_rect, hub, rq, context);
                    rq.add(RenderData::new(
                        self.child(i).id(),
                        shifted_rect,
                        UpdateMode::Gui,
                    ));
                }
            }
        }
    }

    fn toggle_tool_bar(&mut self, enable: bool, rq: &mut RenderQueue, context: &mut Context) {
        if let Some(index) = locate::<ToolBar>(self) {
            if enable {
                return;
            }

            let mut rect = *self.child(index).rect();
            rect.absorb(self.child(index - 1).rect());
            self.children.drain(index - 1..=index);
            rq.add(RenderData::expose(rect, UpdateMode::Gui));
        } else {
            if !enable {
                return;
            }

            let dpi = CURRENT_DEVICE.dpi;
            let big_height = scale_by_dpi(BIG_BAR_HEIGHT, dpi) as i32;
            let tb_height = 2 * big_height;

            let sp_rect = *self.child(2).rect() - pt!(0, tb_height as i32);

            let tool_bar = ToolBar::new(
                rect![
                    self.rect.min.x,
                    sp_rect.max.y,
                    self.rect.max.x,
                    sp_rect.max.y + tb_height as i32
                ],
                self.reflowable,
                self.info.reader.as_ref(),
                &context.settings.reader,
            );
            self.children.insert(2, Box::new(tool_bar) as Box<dyn View>);

            let separator = Filler::new(sp_rect, BLACK);
            self.children
                .insert(2, Box::new(separator) as Box<dyn View>);
        }
    }

    fn toggle_results_bar(&mut self, enable: bool, rq: &mut RenderQueue, _context: &mut Context) {
        if let Some(index) = locate::<ResultsBar>(self) {
            if enable {
                return;
            }

            let mut rect = *self.child(index).rect();
            rect.absorb(self.child(index - 1).rect());
            self.children.drain(index - 1..=index);
            rq.add(RenderData::expose(rect, UpdateMode::Gui));
        } else {
            if !enable {
                return;
            }

            let dpi = CURRENT_DEVICE.dpi;
            let thickness = scale_by_dpi(THICKNESS_MEDIUM, dpi) as i32;
            let small_height = scale_by_dpi(SMALL_BAR_HEIGHT, dpi) as i32;
            let index = locate::<TopBar>(self).map(|index| index + 2).unwrap_or(0);

            let sp_rect = *self.child(index).rect() - pt!(0, small_height);
            let y_min = sp_rect.max.y;
            let mut rect = rect![
                self.rect.min.x,
                y_min,
                self.rect.max.x,
                y_min + small_height - thickness
            ];

            if let Some(ref s) = self.search {
                let results_bar = ResultsBar::new(
                    rect,
                    s.current_page,
                    s.highlights.len(),
                    s.results_count,
                    !s.running.load(AtomicOrdering::Relaxed),
                );
                self.children
                    .insert(index, Box::new(results_bar) as Box<dyn View>);
                let separator = Filler::new(sp_rect, BLACK);
                self.children
                    .insert(index, Box::new(separator) as Box<dyn View>);
                rect.absorb(&sp_rect);
                rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
            }
        }
    }

    fn toggle_search_bar(
        &mut self,
        enable: bool,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate::<SearchBar>(self) {
            if enable {
                return;
            }

            if let Some(ViewId::ReaderSearchInput) = self.focus {
                self.toggle_keyboard(false, None, hub, rq, context);
            }

            if self.child(0).is::<TopBar>() {
                self.toggle_bars(Some(false), hub, rq, context);
            } else {
                let mut rect = *self.child(index).rect();
                rect.absorb(self.child(index - 1).rect());
                rect.absorb(self.child(index + 1).rect());
                self.children.drain(index - 1..=index + 1);
                rq.add(RenderData::expose(rect, UpdateMode::Gui));
            }
        } else {
            if !enable {
                return;
            }

            self.toggle_tool_bar(false, rq, context);

            let dpi = CURRENT_DEVICE.dpi;
            let thickness = scale_by_dpi(THICKNESS_MEDIUM, dpi) as i32;
            let (small_thickness, big_thickness) = halves(thickness);
            let small_height = scale_by_dpi(SMALL_BAR_HEIGHT, dpi) as i32;
            let index = locate::<TopBar>(self).map(|index| index + 2).unwrap_or(0);

            if index == 0 {
                let sp_rect = rect![
                    self.rect.min.x,
                    self.rect.max.y - small_height - small_thickness,
                    self.rect.max.x,
                    self.rect.max.y - small_height + big_thickness
                ];
                let separator = Filler::new(sp_rect, BLACK);
                self.children
                    .insert(index, Box::new(separator) as Box<dyn View>);
            }

            let sp_rect = rect![
                self.rect.min.x,
                self.rect.max.y - 2 * small_height - small_thickness,
                self.rect.max.x,
                self.rect.max.y - 2 * small_height + big_thickness
            ];
            let y_min = sp_rect.max.y;
            let rect = rect![
                self.rect.min.x,
                y_min,
                self.rect.max.x,
                y_min + small_height - thickness
            ];
            let search_bar = SearchBar::new(rect, ViewId::ReaderSearchInput, "", "", context);
            self.children
                .insert(index, Box::new(search_bar) as Box<dyn View>);

            let separator = Filler::new(sp_rect, BLACK);
            self.children
                .insert(index, Box::new(separator) as Box<dyn View>);

            rq.add(RenderData::new(
                self.child(index).id(),
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            rq.add(RenderData::new(
                self.child(index + 1).id(),
                *self.child(index + 1).rect(),
                UpdateMode::Gui,
            ));

            if index == 0 {
                rq.add(RenderData::new(
                    self.child(index + 2).id(),
                    *self.child(index + 2).rect(),
                    UpdateMode::Gui,
                ));
            }

            self.toggle_keyboard(true, Some(ViewId::ReaderSearchInput), hub, rq, context);
            hub.send(Event::Focus(Some(ViewId::ReaderSearchInput))).ok();
        }
    }

    fn toggle_bars(
        &mut self,
        enable: Option<bool>,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(top_index) = locate::<TopBar>(self) {
            if let Some(true) = enable {
                return;
            }

            if let Some(bottom_index) = locate::<BottomBar>(self) {
                let mut top_rect = *self.child(top_index).rect();
                top_rect.absorb(self.child(top_index + 1).rect());
                let mut bottom_rect = *self.child(bottom_index).rect();
                for i in top_index + 2..bottom_index {
                    bottom_rect.absorb(self.child(i).rect());
                }

                self.children.drain(top_index..=bottom_index);

                rq.add(RenderData::expose(top_rect, UpdateMode::Gui));
                rq.add(RenderData::expose(bottom_rect, UpdateMode::Gui));
                hub.send(Event::Focus(None)).ok();
            }
        } else {
            if let Some(false) = enable {
                return;
            }

            let dpi = CURRENT_DEVICE.dpi;
            let thickness = scale_by_dpi(THICKNESS_MEDIUM, dpi) as i32;
            let (small_thickness, big_thickness) = halves(thickness);
            let (small_height, big_height) = (
                scale_by_dpi(SMALL_BAR_HEIGHT, dpi) as i32,
                scale_by_dpi(BIG_BAR_HEIGHT, dpi) as i32,
            );

            let mut doc = self.doc.lock().unwrap();
            let mut index = 0;

            let top_bar = TopBar::new(
                rect![
                    self.rect.min.x,
                    self.rect.min.y,
                    self.rect.max.x,
                    self.rect.min.y + small_height - small_thickness
                ],
                TopBarVariant::Back,
                self.info.title(),
                context,
            );

            self.children
                .insert(index, Box::new(top_bar) as Box<dyn View>);
            index += 1;

            let separator = Filler::new(
                rect![
                    self.rect.min.x,
                    self.rect.min.y + small_height - small_thickness,
                    self.rect.max.x,
                    self.rect.min.y + small_height + big_thickness
                ],
                BLACK,
            );
            self.children
                .insert(index, Box::new(separator) as Box<dyn View>);
            index += 1;

            if let Some(ref s) = self.search {
                if let Some(sindex) = rlocate::<SearchBar>(self) {
                    index = sindex + 2;
                } else {
                    let separator = Filler::new(
                        rect![
                            self.rect.min.x,
                            self.rect.max.y - 3 * small_height - small_thickness,
                            self.rect.max.x,
                            self.rect.max.y - 3 * small_height + big_thickness
                        ],
                        BLACK,
                    );
                    self.children
                        .insert(index, Box::new(separator) as Box<dyn View>);
                    index += 1;

                    let results_bar = ResultsBar::new(
                        rect![
                            self.rect.min.x,
                            self.rect.max.y - 3 * small_height + big_thickness,
                            self.rect.max.x,
                            self.rect.max.y - 2 * small_height - small_thickness
                        ],
                        s.current_page,
                        s.highlights.len(),
                        s.results_count,
                        !s.running.load(AtomicOrdering::Relaxed),
                    );
                    self.children
                        .insert(index, Box::new(results_bar) as Box<dyn View>);
                    index += 1;

                    let separator = Filler::new(
                        rect![
                            self.rect.min.x,
                            self.rect.max.y - 2 * small_height - small_thickness,
                            self.rect.max.x,
                            self.rect.max.y - 2 * small_height + big_thickness
                        ],
                        BLACK,
                    );
                    self.children
                        .insert(index, Box::new(separator) as Box<dyn View>);
                    index += 1;

                    let search_bar = SearchBar::new(
                        rect![
                            self.rect.min.x,
                            self.rect.max.y - 2 * small_height + big_thickness,
                            self.rect.max.x,
                            self.rect.max.y - small_height - small_thickness
                        ],
                        ViewId::ReaderSearchInput,
                        "",
                        &s.query,
                        context,
                    );
                    self.children
                        .insert(index, Box::new(search_bar) as Box<dyn View>);
                    index += 1;
                }
            } else {
                let tb_height = 2 * big_height;
                let separator = Filler::new(
                    rect![
                        self.rect.min.x,
                        self.rect.max.y - (small_height + tb_height) as i32 - small_thickness,
                        self.rect.max.x,
                        self.rect.max.y - (small_height + tb_height) as i32 + big_thickness
                    ],
                    BLACK,
                );
                self.children
                    .insert(index, Box::new(separator) as Box<dyn View>);
                index += 1;

                let tool_bar = ToolBar::new(
                    rect![
                        self.rect.min.x,
                        self.rect.max.y - (small_height + tb_height) as i32 + big_thickness,
                        self.rect.max.x,
                        self.rect.max.y - small_height - small_thickness
                    ],
                    self.reflowable,
                    self.info.reader.as_ref(),
                    &context.settings.reader,
                );
                self.children
                    .insert(index, Box::new(tool_bar) as Box<dyn View>);
                index += 1;
            }

            let separator = Filler::new(
                rect![
                    self.rect.min.x,
                    self.rect.max.y - small_height - small_thickness,
                    self.rect.max.x,
                    self.rect.max.y - small_height + big_thickness
                ],
                BLACK,
            );
            self.children
                .insert(index, Box::new(separator) as Box<dyn View>);
            index += 1;

            let neighbors = Neighbors {
                previous_page: doc.resolve_location(Location::Previous(self.current_page)),
                next_page: doc.resolve_location(Location::Next(self.current_page)),
            };

            let bottom_bar = BottomBar::new(
                rect![
                    self.rect.min.x,
                    self.rect.max.y - small_height + big_thickness,
                    self.rect.max.x,
                    self.rect.max.y
                ],
                doc.as_mut(),
                self.toc(),
                self.current_page,
                self.pages_count,
                &neighbors,
                self.synthetic,
            );
            self.children
                .insert(index, Box::new(bottom_bar) as Box<dyn View>);

            for i in 0..=index {
                rq.add(RenderData::new(
                    self.child(i).id(),
                    *self.child(i).rect(),
                    UpdateMode::Gui,
                ));
            }
        }
    }

    fn toggle_margin_cropper(
        &mut self,
        enable: bool,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate::<MarginCropper>(self) {
            if enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if !enable {
                return;
            }

            self.toggle_bars(Some(false), hub, rq, context);

            let dpi = CURRENT_DEVICE.dpi;
            let padding = scale_by_dpi(BUTTON_DIAMETER / 2.0, dpi) as i32;
            let pixmap_rect = rect![self.rect.min + pt!(padding), self.rect.max - pt!(padding)];

            let margin = self
                .info
                .reader
                .as_ref()
                .and_then(|r| {
                    r.cropping_margins
                        .as_ref()
                        .map(|c| c.margin(self.current_page))
                })
                .cloned()
                .unwrap_or_default();

            let mut doc = self.doc.lock().unwrap();
            let (pixmap, _) = build_pixmap(&pixmap_rect, doc.as_mut(), self.current_page);

            let margin_cropper = MarginCropper::new(self.rect, pixmap, &margin, context);
            rq.add(RenderData::new(
                margin_cropper.id(),
                *margin_cropper.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(margin_cropper) as Box<dyn View>);
        }
    }

    fn toggle_edit_note(
        &mut self,
        text: Option<String>,
        enable: Option<bool>,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::EditNote) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);

            if self
                .focus
                .map(|focus_id| focus_id == ViewId::EditNoteInput)
                .unwrap_or(false)
            {
                self.toggle_keyboard(false, None, hub, rq, context);
            }
        } else {
            if let Some(false) = enable {
                return;
            }

            let mut edit_note = NamedInput::new(
                "Note".to_string(),
                ViewId::EditNote,
                ViewId::EditNoteInput,
                32,
                context,
            );
            if let Some(text) = text.as_ref() {
                edit_note.set_text(text, &mut RenderQueue::new(), context);
            }

            rq.add(RenderData::new(
                edit_note.id(),
                *edit_note.rect(),
                UpdateMode::Gui,
            ));
            hub.send(Event::Focus(Some(ViewId::EditNoteInput))).ok();

            self.children.push(Box::new(edit_note) as Box<dyn View>);
        }
    }

    fn toggle_name_page(
        &mut self,
        enable: Option<bool>,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::NamePage) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);

            if self
                .focus
                .map(|focus_id| focus_id == ViewId::NamePageInput)
                .unwrap_or(false)
            {
                self.toggle_keyboard(false, None, hub, rq, context);
            }
        } else {
            if let Some(false) = enable {
                return;
            }

            let name_page = NamedInput::new(
                "Name page".to_string(),
                ViewId::NamePage,
                ViewId::NamePageInput,
                4,
                context,
            );
            rq.add(RenderData::new(
                name_page.id(),
                *name_page.rect(),
                UpdateMode::Gui,
            ));
            hub.send(Event::Focus(Some(ViewId::NamePageInput))).ok();

            self.children.push(Box::new(name_page) as Box<dyn View>);
        }
    }

    fn toggle_go_to_page(
        &mut self,
        enable: Option<bool>,
        id: ViewId,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        let (text, input_id) = if id == ViewId::GoToPage {
            ("Go to page", ViewId::GoToPageInput)
        } else {
            ("Go to results page", ViewId::GoToResultsPageInput)
        };

        if let Some(index) = locate_by_id(self, id) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);

            if self
                .focus
                .map(|focus_id| focus_id == input_id)
                .unwrap_or(false)
            {
                self.toggle_keyboard(false, None, hub, rq, context);
            }
        } else {
            if let Some(false) = enable {
                return;
            }

            let go_to_page = NamedInput::new(text.to_string(), id, input_id, 4, context);
            rq.add(RenderData::new(
                go_to_page.id(),
                *go_to_page.rect(),
                UpdateMode::Gui,
            ));
            hub.send(Event::Focus(Some(input_id))).ok();

            self.children.push(Box::new(go_to_page) as Box<dyn View>);
        }
    }

    pub fn toggle_annotation_menu(
        &mut self,
        annot: &Annotation,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::AnnotationMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let sel = annot.selection;
            let mut entries = Vec::new();

            if annot.note.is_empty() {
                entries.push(EntryKind::Command(
                    "Remove Highlight".to_string(),
                    EntryId::RemoveAnnotation(sel),
                ));
                entries.push(EntryKind::Separator);
                entries.push(EntryKind::Command(
                    "Add Note".to_string(),
                    EntryId::EditAnnotationNote(sel),
                ));
            } else {
                entries.push(EntryKind::Command(
                    "Remove Annotation".to_string(),
                    EntryId::RemoveAnnotation(sel),
                ));
                entries.push(EntryKind::Separator);
                entries.push(EntryKind::Command(
                    "Edit Note".to_string(),
                    EntryId::EditAnnotationNote(sel),
                ));
                entries.push(EntryKind::Command(
                    "Remove Note".to_string(),
                    EntryId::RemoveAnnotationNote(sel),
                ));
            }

            let selection_menu = Menu::new(
                rect,
                ViewId::AnnotationMenu,
                MenuKind::Contextual,
                entries,
                context,
            );
            rq.add(RenderData::new(
                selection_menu.id(),
                *selection_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(selection_menu) as Box<dyn View>);
        }
    }

    pub fn toggle_selection_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::SelectionMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }
            let mut entries = vec![
                EntryKind::Command("Highlight".to_string(), EntryId::HighlightSelection),
                EntryKind::Command("Add Note".to_string(), EntryId::AnnotateSelection),
            ];

            entries.push(EntryKind::Separator);
            entries.push(EntryKind::Command(
                "Define".to_string(),
                EntryId::DefineSelection,
            ));
            entries.push(EntryKind::Command(
                "Search".to_string(),
                EntryId::SearchForSelection,
            ));

            if self
                .info
                .reader
                .as_ref()
                .map_or(false, |r| !r.page_names.is_empty())
            {
                entries.push(EntryKind::Command(
                    "Go To".to_string(),
                    EntryId::GoToSelectedPageName,
                ));
            }

            entries.push(EntryKind::Separator);
            entries.push(EntryKind::Command(
                "Adjust Selection".to_string(),
                EntryId::AdjustSelection,
            ));

            let selection_menu = Menu::new(
                rect,
                ViewId::SelectionMenu,
                MenuKind::Contextual,
                entries,
                context,
            );
            rq.add(RenderData::new(
                selection_menu.id(),
                *selection_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(selection_menu) as Box<dyn View>);
        }
    }

    pub fn toggle_title_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::TitleMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let zoom_mode = self.view_port.zoom_mode;
            let scroll_mode = self.view_port.scroll_mode;
            let sf = if let ZoomMode::Custom(sf) = zoom_mode {
                sf
            } else {
                1.0
            };

            let mut entries = if self.reflowable {
                vec![EntryKind::SubMenu(
                    "Zoom Mode".to_string(),
                    vec![
                        EntryKind::RadioButton(
                            "Fit to Page".to_string(),
                            EntryId::SetZoomMode(ZoomMode::FitToPage),
                            zoom_mode == ZoomMode::FitToPage,
                        ),
                        EntryKind::RadioButton(
                            format!("Custom ({:.1}%)", 100.0 * sf),
                            EntryId::SetZoomMode(ZoomMode::Custom(sf)),
                            zoom_mode == ZoomMode::Custom(sf),
                        ),
                    ],
                )]
            } else {
                vec![EntryKind::SubMenu(
                    "Zoom Mode".to_string(),
                    vec![
                        EntryKind::RadioButton(
                            "Fit to Page".to_string(),
                            EntryId::SetZoomMode(ZoomMode::FitToPage),
                            zoom_mode == ZoomMode::FitToPage,
                        ),
                        EntryKind::RadioButton(
                            "Fit to Width".to_string(),
                            EntryId::SetZoomMode(ZoomMode::FitToWidth),
                            zoom_mode == ZoomMode::FitToWidth,
                        ),
                        EntryKind::RadioButton(
                            format!("Custom ({:.1}%)", 100.0 * sf),
                            EntryId::SetZoomMode(ZoomMode::Custom(sf)),
                            zoom_mode == ZoomMode::Custom(sf),
                        ),
                    ],
                )]
            };

            entries.push(EntryKind::SubMenu(
                "Scroll Mode".to_string(),
                vec![
                    EntryKind::RadioButton(
                        "Screen".to_string(),
                        EntryId::SetScrollMode(ScrollMode::Screen),
                        scroll_mode == ScrollMode::Screen,
                    ),
                    EntryKind::RadioButton(
                        "Page".to_string(),
                        EntryId::SetScrollMode(ScrollMode::Page),
                        scroll_mode == ScrollMode::Page,
                    ),
                ],
            ));

            if self.ephemeral {
                entries.push(EntryKind::Command("Save".to_string(), EntryId::Save));
            }

            if self
                .info
                .reader
                .as_ref()
                .map_or(false, |r| !r.annotations.is_empty())
            {
                entries.push(EntryKind::Command(
                    "Annotations".to_string(),
                    EntryId::Annotations,
                ));
            }

            if self
                .info
                .reader
                .as_ref()
                .map_or(false, |r| !r.bookmarks.is_empty())
            {
                entries.push(EntryKind::Command(
                    "Bookmarks".to_string(),
                    EntryId::Bookmarks,
                ));
            }

            if !entries.is_empty() {
                entries.push(EntryKind::Separator);
            }

            entries.push(EntryKind::CheckBox(
                "Apply Dithering".to_string(),
                EntryId::ToggleDithered,
                context.fb.dithered(),
            ));

            let mut title_menu = Menu::new(
                rect,
                ViewId::TitleMenu,
                MenuKind::DropDown,
                entries,
                context,
            );
            title_menu
                .child_mut(1)
                .downcast_mut::<MenuEntry>()
                .unwrap()
                .set_disabled(zoom_mode != ZoomMode::FitToWidth, rq);

            rq.add(RenderData::new(
                title_menu.id(),
                *title_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children.push(Box::new(title_menu) as Box<dyn View>);
        }
    }

    fn toggle_font_family_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::FontFamilyMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let mut families = family_names(&context.settings.reader.font_path)
                .map_err(|e| error!("Can't get family names: {:#}.", e))
                .unwrap_or_default();
            let current_family = self
                .info
                .reader
                .as_ref()
                .and_then(|r| r.font_family.clone())
                .unwrap_or_else(|| context.settings.reader.font_family.clone());
            families.insert(DEFAULT_FONT_FAMILY.to_string());
            let entries = families
                .iter()
                .map(|f| {
                    EntryKind::RadioButton(
                        f.clone(),
                        EntryId::SetFontFamily(f.clone()),
                        *f == current_family,
                    )
                })
                .collect();
            let font_family_menu = Menu::new(
                rect,
                ViewId::FontFamilyMenu,
                MenuKind::DropDown,
                entries,
                context,
            );
            rq.add(RenderData::new(
                font_family_menu.id(),
                *font_family_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(font_family_menu) as Box<dyn View>);
        }
    }

    fn toggle_font_size_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::FontSizeMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let font_size = self
                .info
                .reader
                .as_ref()
                .and_then(|r| r.font_size)
                .unwrap_or(context.settings.reader.font_size);
            let min_font_size = context.settings.reader.font_size / 2.0;
            let max_font_size = 3.0 * context.settings.reader.font_size / 2.0;
            let entries = (0..=20)
                .filter_map(|v| {
                    let fs = font_size - 1.0 + v as f32 / 10.0;
                    if fs >= min_font_size && fs <= max_font_size {
                        Some(EntryKind::RadioButton(
                            format!("{:.1}", fs),
                            EntryId::SetFontSize(v),
                            (fs - font_size).abs() < 0.05,
                        ))
                    } else {
                        None
                    }
                })
                .collect();
            let font_size_menu = Menu::new(
                rect,
                ViewId::FontSizeMenu,
                MenuKind::Contextual,
                entries,
                context,
            );
            rq.add(RenderData::new(
                font_size_menu.id(),
                *font_size_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(font_size_menu) as Box<dyn View>);
        }
    }

    fn toggle_text_align_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::TextAlignMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let text_align = self
                .info
                .reader
                .as_ref()
                .and_then(|r| r.text_align)
                .unwrap_or(context.settings.reader.text_align);
            let choices = [
                TextAlign::Justify,
                TextAlign::Left,
                TextAlign::Right,
                TextAlign::Center,
            ];
            let entries = choices
                .iter()
                .map(|v| {
                    EntryKind::RadioButton(
                        v.to_string(),
                        EntryId::SetTextAlign(*v),
                        text_align == *v,
                    )
                })
                .collect();
            let text_align_menu = Menu::new(
                rect,
                ViewId::TextAlignMenu,
                MenuKind::Contextual,
                entries,
                context,
            );
            rq.add(RenderData::new(
                text_align_menu.id(),
                *text_align_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(text_align_menu) as Box<dyn View>);
        }
    }

    fn toggle_line_height_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::LineHeightMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let line_height = self
                .info
                .reader
                .as_ref()
                .and_then(|r| r.line_height)
                .unwrap_or(context.settings.reader.line_height);
            let entries = (0..=10)
                .map(|x| {
                    let lh = 1.0 + x as f32 / 10.0;
                    EntryKind::RadioButton(
                        format!("{:.1}", lh),
                        EntryId::SetLineHeight(x),
                        (lh - line_height).abs() < 0.05,
                    )
                })
                .collect();
            let line_height_menu = Menu::new(
                rect,
                ViewId::LineHeightMenu,
                MenuKind::DropDown,
                entries,
                context,
            );
            rq.add(RenderData::new(
                line_height_menu.id(),
                *line_height_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(line_height_menu) as Box<dyn View>);
        }
    }

    fn toggle_contrast_exponent_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::ContrastExponentMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let entries = (0..=8)
                .map(|x| {
                    let e = 1.0 + x as f32 / 2.0;
                    EntryKind::RadioButton(
                        format!("{:.1}", e),
                        EntryId::SetContrastExponent(x),
                        (e - self.contrast.exponent).abs() < f32::EPSILON,
                    )
                })
                .collect();
            let contrast_exponent_menu = Menu::new(
                rect,
                ViewId::ContrastExponentMenu,
                MenuKind::DropDown,
                entries,
                context,
            );
            rq.add(RenderData::new(
                contrast_exponent_menu.id(),
                *contrast_exponent_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(contrast_exponent_menu) as Box<dyn View>);
        }
    }

    fn toggle_contrast_gray_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::ContrastGrayMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let entries = (1..=6)
                .map(|x| {
                    let g = ((1 << 8) - (1 << (8 - x))) as f32;
                    EntryKind::RadioButton(
                        format!("{:.1}", g),
                        EntryId::SetContrastGray(x),
                        (g - self.contrast.gray).abs() < f32::EPSILON,
                    )
                })
                .collect();
            let contrast_gray_menu = Menu::new(
                rect,
                ViewId::ContrastGrayMenu,
                MenuKind::DropDown,
                entries,
                context,
            );
            rq.add(RenderData::new(
                contrast_gray_menu.id(),
                *contrast_gray_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(contrast_gray_menu) as Box<dyn View>);
        }
    }

    fn toggle_margin_width_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::MarginWidthMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let reflowable = self.reflowable;
            let margin_width = self
                .info
                .reader
                .as_ref()
                .and_then(|r| {
                    if reflowable {
                        r.margin_width
                    } else {
                        r.screen_margin_width
                    }
                })
                .unwrap_or_else(|| {
                    if reflowable {
                        context.settings.reader.margin_width
                    } else {
                        0
                    }
                });
            let min_margin_width = context.settings.reader.min_margin_width;
            let max_margin_width = context.settings.reader.max_margin_width;
            let entries = (min_margin_width..=max_margin_width)
                .map(|mw| {
                    EntryKind::RadioButton(
                        format!("{}", mw),
                        EntryId::SetMarginWidth(mw),
                        mw == margin_width,
                    )
                })
                .collect();
            let margin_width_menu = Menu::new(
                rect,
                ViewId::MarginWidthMenu,
                MenuKind::DropDown,
                entries,
                context,
            );
            rq.add(RenderData::new(
                margin_width_menu.id(),
                *margin_width_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(margin_width_menu) as Box<dyn View>);
        }
    }

    fn toggle_page_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::PageMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let has_name = self
                .info
                .reader
                .as_ref()
                .map_or(false, |r| r.page_names.contains_key(&self.current_page));

            let mut entries = vec![EntryKind::Command("Name".to_string(), EntryId::SetPageName)];
            if has_name {
                entries.push(EntryKind::Command(
                    "Remove Name".to_string(),
                    EntryId::RemovePageName,
                ));
            }
            let names = self
                .info
                .reader
                .as_ref()
                .map(|r| {
                    r.page_names
                        .iter()
                        .map(|(i, s)| EntryKind::Command(s.to_string(), EntryId::GoTo(*i)))
                        .collect::<Vec<EntryKind>>()
                })
                .unwrap_or_default();
            if !names.is_empty() {
                entries.push(EntryKind::Separator);
                entries.push(EntryKind::SubMenu("Go To".to_string(), names));
            }

            let page_menu = Menu::new(rect, ViewId::PageMenu, MenuKind::DropDown, entries, context);
            rq.add(RenderData::new(
                page_menu.id(),
                *page_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children.push(Box::new(page_menu) as Box<dyn View>);
        }
    }

    fn toggle_margin_cropper_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::MarginCropperMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let current_page = self.current_page;
            let is_split = self
                .info
                .reader
                .as_ref()
                .and_then(|r| r.cropping_margins.as_ref().map(CroppingMargins::is_split));

            let mut entries = vec![
                EntryKind::RadioButton(
                    "Any".to_string(),
                    EntryId::ApplyCroppings(current_page, PageScheme::Any),
                    is_split.is_some() && !is_split.unwrap(),
                ),
                EntryKind::RadioButton(
                    "Even/Odd".to_string(),
                    EntryId::ApplyCroppings(current_page, PageScheme::EvenOdd),
                    is_split.is_some() && is_split.unwrap(),
                ),
            ];

            let is_applied = self
                .info
                .reader
                .as_ref()
                .map(|r| r.cropping_margins.is_some())
                .unwrap_or(false);
            if is_applied {
                entries.extend_from_slice(&[
                    EntryKind::Separator,
                    EntryKind::Command("Remove".to_string(), EntryId::RemoveCroppings),
                ]);
            }

            let margin_cropper_menu = Menu::new(
                rect,
                ViewId::MarginCropperMenu,
                MenuKind::DropDown,
                entries,
                context,
            );
            rq.add(RenderData::new(
                margin_cropper_menu.id(),
                *margin_cropper_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children
                .push(Box::new(margin_cropper_menu) as Box<dyn View>);
        }
    }

    fn toggle_search_menu(
        &mut self,
        rect: Rectangle,
        enable: Option<bool>,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(index) = locate_by_id(self, ViewId::SearchMenu) {
            if let Some(true) = enable {
                return;
            }

            rq.add(RenderData::expose(
                *self.child(index).rect(),
                UpdateMode::Gui,
            ));
            self.children.remove(index);
        } else {
            if let Some(false) = enable {
                return;
            }

            let entries = vec![
                EntryKind::RadioButton(
                    "Forward".to_string(),
                    EntryId::SearchDirection(LinearDir::Forward),
                    self.search_direction == LinearDir::Forward,
                ),
                EntryKind::RadioButton(
                    "Backward".to_string(),
                    EntryId::SearchDirection(LinearDir::Backward),
                    self.search_direction == LinearDir::Backward,
                ),
            ];

            let search_menu = Menu::new(
                rect,
                ViewId::SearchMenu,
                MenuKind::Contextual,
                entries,
                context,
            );
            rq.add(RenderData::new(
                search_menu.id(),
                *search_menu.rect(),
                UpdateMode::Gui,
            ));
            self.children.push(Box::new(search_menu) as Box<dyn View>);
        }
    }

    fn set_font_size(
        &mut self,
        font_size: f32,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if Arc::strong_count(&self.doc) > 1 {
            return;
        }

        if let Some(ref mut r) = self.info.reader {
            r.font_size = Some(font_size);
        }

        let (width, height) = context.display.dims;
        {
            let mut doc = self.doc.lock().unwrap();

            doc.layout(width, height, font_size, CURRENT_DEVICE.dpi);

            if self.synthetic {
                let current_page = self.current_page.min(doc.pages_count() - 1);
                if let Some(location) = doc.resolve_location(Location::Exact(current_page)) {
                    self.current_page = location;
                }
            } else {
                let ratio = doc.pages_count() / self.pages_count;
                self.pages_count = doc.pages_count();
                self.current_page = (ratio * self.current_page).min(self.pages_count - 1);
            }
        }

        self.cache.clear();
        self.text.clear();
        self.update(None, hub, rq, context);
        self.update_tool_bar(rq, context);
        self.update_bottom_bar(rq);
    }

    fn set_text_align(
        &mut self,
        text_align: TextAlign,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if Arc::strong_count(&self.doc) > 1 {
            return;
        }

        if let Some(ref mut r) = self.info.reader {
            r.text_align = Some(text_align);
        }

        {
            let mut doc = self.doc.lock().unwrap();
            doc.set_text_align(text_align);

            if self.synthetic {
                let current_page = self.current_page.min(doc.pages_count() - 1);
                if let Some(location) = doc.resolve_location(Location::Exact(current_page)) {
                    self.current_page = location;
                }
            } else {
                self.pages_count = doc.pages_count();
                self.current_page = self.current_page.min(self.pages_count - 1);
            }
        }

        self.cache.clear();
        self.text.clear();
        self.update(None, hub, rq, context);
        self.update_tool_bar(rq, context);
        self.update_bottom_bar(rq);
    }

    fn set_font_family(
        &mut self,
        font_family: &str,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if Arc::strong_count(&self.doc) > 1 {
            return;
        }

        if let Some(ref mut r) = self.info.reader {
            r.font_family = Some(font_family.to_string());
        }

        {
            let mut doc = self.doc.lock().unwrap();
            let font_path = if font_family == DEFAULT_FONT_FAMILY {
                "fonts"
            } else {
                &context.settings.reader.font_path
            };

            doc.set_font_family(font_family, font_path);

            if self.synthetic {
                let current_page = self.current_page.min(doc.pages_count() - 1);
                if let Some(location) = doc.resolve_location(Location::Exact(current_page)) {
                    self.current_page = location;
                }
            } else {
                self.pages_count = doc.pages_count();
                self.current_page = self.current_page.min(self.pages_count - 1);
            }
        }

        self.cache.clear();
        self.text.clear();
        self.update(None, hub, rq, context);
        self.update_tool_bar(rq, context);
        self.update_bottom_bar(rq);
    }

    fn set_line_height(
        &mut self,
        line_height: f32,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if Arc::strong_count(&self.doc) > 1 {
            return;
        }

        if let Some(ref mut r) = self.info.reader {
            r.line_height = Some(line_height);
        }

        {
            let mut doc = self.doc.lock().unwrap();
            doc.set_line_height(line_height);

            if self.synthetic {
                let current_page = self.current_page.min(doc.pages_count() - 1);
                if let Some(location) = doc.resolve_location(Location::Exact(current_page)) {
                    self.current_page = location;
                }
            } else {
                self.pages_count = doc.pages_count();
                self.current_page = self.current_page.min(self.pages_count - 1);
            }
        }

        self.cache.clear();
        self.text.clear();
        self.update(None, hub, rq, context);
        self.update_tool_bar(rq, context);
        self.update_bottom_bar(rq);
    }

    fn set_margin_width(
        &mut self,
        width: i32,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if Arc::strong_count(&self.doc) > 1 {
            return;
        }

        if let Some(ref mut r) = self.info.reader {
            if self.reflowable {
                r.margin_width = Some(width);
            } else {
                if width == 0 {
                    r.screen_margin_width = None;
                } else {
                    r.screen_margin_width = Some(width);
                }
            }
        }

        if self.reflowable {
            let mut doc = self.doc.lock().unwrap();
            doc.set_margin_width(width);

            if self.synthetic {
                let current_page = self.current_page.min(doc.pages_count() - 1);
                if let Some(location) = doc.resolve_location(Location::Exact(current_page)) {
                    self.current_page = location;
                }
            } else {
                self.pages_count = doc.pages_count();
                self.current_page = self.current_page.min(self.pages_count - 1);
            }
        } else {
            let next_margin_width = mm_to_px(width as f32, CURRENT_DEVICE.dpi) as i32;
            if self.view_port.zoom_mode == ZoomMode::FitToWidth {
                // Apply the scale change.
                let ratio = (self.rect.width() as i32 - 2 * next_margin_width) as f32
                    / (self.rect.width() as i32 - 2 * self.view_port.margin_width) as f32;
                self.view_port.page_offset.y = (self.view_port.page_offset.y as f32 * ratio) as i32;
            } else {
                // Keep the center still.
                self.view_port.page_offset += pt!(next_margin_width - self.view_port.margin_width);
            }
            self.view_port.margin_width = next_margin_width;
        }

        self.text.clear();
        self.cache.clear();
        self.update(None, hub, rq, context);
        self.update_tool_bar(rq, context);
        self.update_bottom_bar(rq);
    }

    fn toggle_bookmark(&mut self, rq: &mut RenderQueue) {
        if let Some(ref mut r) = self.info.reader {
            if !r.bookmarks.insert(self.current_page) {
                r.bookmarks.remove(&self.current_page);
            }
        }
        let dpi = CURRENT_DEVICE.dpi;
        let thickness = scale_by_dpi(3.0, dpi) as u16;
        let radius = mm_to_px(0.4, dpi) as i32 + thickness as i32;
        let center = pt!(self.rect.max.x - 5 * radius, self.rect.min.y + 5 * radius);
        let rect = Rectangle::from_disk(center, radius);
        rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
    }

    fn set_contrast_exponent(
        &mut self,
        exponent: f32,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(ref mut r) = self.info.reader {
            r.contrast_exponent = Some(exponent);
        }
        self.contrast.exponent = exponent;
        self.update(None, hub, rq, context);
        self.update_tool_bar(rq, context);
    }

    fn set_contrast_gray(
        &mut self,
        gray: f32,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if let Some(ref mut r) = self.info.reader {
            r.contrast_gray = Some(gray);
        }
        self.contrast.gray = gray;
        self.update(None, hub, rq, context);
        self.update_tool_bar(rq, context);
    }

    fn set_zoom_mode(
        &mut self,
        zoom_mode: ZoomMode,
        reset_page_offset: bool,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        if self.view_port.zoom_mode == zoom_mode {
            return;
        }

        if let Some(index) = locate_by_id(self, ViewId::TitleMenu) {
            self.child_mut(index)
                .child_mut(1)
                .downcast_mut::<MenuEntry>()
                .unwrap()
                .set_disabled(zoom_mode != ZoomMode::FitToWidth, rq);
        }

        self.view_port.zoom_mode = zoom_mode;
        if reset_page_offset {
            self.view_port.page_offset = pt!(0, 0);
        }
        self.cache.clear();
        self.update(None, hub, rq, context);
    }

    fn set_scroll_mode(
        &mut self,
        scroll_mode: ScrollMode,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        if self.view_port.scroll_mode == scroll_mode
            || self.view_port.zoom_mode != ZoomMode::FitToWidth
        {
            return;
        }
        self.view_port.scroll_mode = scroll_mode;
        self.view_port.page_offset = pt!(0, 0);
        self.update(None, hub, rq, context);
    }

    fn crop_margins(
        &mut self,
        index: usize,
        margin: &Margin,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &Context,
    ) {
        if self.view_port.zoom_mode != ZoomMode::FitToPage {
            let Resource { pixmap, frame, .. } = self.cache.get(&index).unwrap();
            let offset = frame.min + self.view_port.page_offset;
            let x_ratio = offset.x as f32 / pixmap.width as f32;
            let y_ratio = offset.y as f32 / pixmap.height as f32;
            let dims = {
                let doc = self.doc.lock().unwrap();
                doc.dims(index).unwrap()
            };
            let scale = scaling_factor(
                &self.rect,
                margin,
                self.view_port.margin_width,
                dims,
                self.view_port.zoom_mode,
            );
            if x_ratio >= margin.left && x_ratio <= (1.0 - margin.right) {
                self.view_port.page_offset.x = (scale * (x_ratio - margin.left) * dims.0) as i32;
            } else {
                self.view_port.page_offset.x = 0;
            }
            if y_ratio >= margin.top && y_ratio <= (1.0 - margin.bottom) {
                self.view_port.page_offset.y = (scale * (y_ratio - margin.top) * dims.1) as i32;
            } else {
                self.view_port.page_offset.y = 0;
            }
        }
        if let Some(r) = self.info.reader.as_mut() {
            if r.cropping_margins.is_none() {
                r.cropping_margins = Some(CroppingMargins::Any(Margin::default()));
            }
            for c in r.cropping_margins.iter_mut() {
                *c.margin_mut(index) = margin.clone();
            }
        }
        self.cache.clear();
        self.update(None, hub, rq, context);
    }

    fn toc(&self) -> Option<Vec<TocEntry>> {
        let mut index = 0;
        self.info
            .toc
            .as_ref()
            .map(|simple_toc| self.toc_aux(simple_toc, &mut index))
    }

    fn toc_aux(&self, simple_toc: &[SimpleTocEntry], index: &mut usize) -> Vec<TocEntry> {
        let mut toc = Vec::new();
        for entry in simple_toc {
            *index += 1;
            match entry {
                SimpleTocEntry::Leaf(title, location)
                | SimpleTocEntry::Container(title, location, _) => {
                    let current_title = title.clone();
                    let current_location = match location {
                        TocLocation::Uri(uri) if uri.starts_with('\'') => self
                            .find_page_by_name(&uri[1..])
                            .map(Location::Exact)
                            .unwrap_or_else(|| location.clone().into()),
                        _ => location.clone().into(),
                    };
                    let current_index = *index;
                    let current_children = if let SimpleTocEntry::Container(_, _, children) = entry
                    {
                        self.toc_aux(children, index)
                    } else {
                        Vec::new()
                    };
                    toc.push(TocEntry {
                        title: current_title,
                        location: current_location,
                        index: current_index,
                        children: current_children,
                    });
                }
            }
        }
        toc
    }

    fn find_page_by_name(&self, name: &str) -> Option<usize> {
        self.info.reader.as_ref().and_then(|r| {
            if let Ok(a) = name.parse::<u32>() {
                r.page_names
                    .iter()
                    .filter_map(|(i, s)| s.parse::<u32>().ok().map(|b| (b, i)))
                    .filter(|(b, _)| *b <= a)
                    .max_by(|x, y| x.0.cmp(&y.0))
                    .map(|(b, i)| *i + (a - b) as usize)
            } else if let Some(a) = name.chars().next().and_then(|c| c.to_alphabetic_digit()) {
                r.page_names
                    .iter()
                    .filter_map(|(i, s)| {
                        s.chars()
                            .next()
                            .and_then(|c| c.to_alphabetic_digit())
                            .map(|c| (c, i))
                    })
                    .filter(|(b, _)| *b <= a)
                    .max_by(|x, y| x.0.cmp(&y.0))
                    .map(|(b, i)| *i + (a - b) as usize)
            } else if let Ok(a) = Roman::from_str(name) {
                r.page_names
                    .iter()
                    .filter_map(|(i, s)| Roman::from_str(s).ok().map(|b| (*b, i)))
                    .filter(|(b, _)| *b <= *a)
                    .max_by(|x, y| x.0.cmp(&y.0))
                    .map(|(b, i)| *i + (*a - b) as usize)
            } else {
                None
            }
        })
    }

    fn text_excerpt(&self, sel: [TextLocation; 2]) -> Option<String> {
        let [start, end] = sel;
        let parts = self
            .text
            .values()
            .flatten()
            .filter(|bnd| bnd.location >= start && bnd.location <= end)
            .map(|bnd| bnd.text.as_str())
            .collect::<Vec<&str>>();

        if parts.is_empty() {
            return None;
        }

        let ws = word_separator(&self.info.language);
        let mut text = parts[0].to_string();

        for p in &parts[1..] {
            if text.ends_with('\u{00AD}') {
                text.pop();
            } else if !text.ends_with('-') {
                text.push_str(ws);
            }
            text += p;
        }

        Some(text)
    }

    fn selected_text(&self) -> Option<String> {
        self.selection
            .as_ref()
            .and_then(|sel| self.text_excerpt([sel.start, sel.end]))
    }

    fn text_rect(&self, sel: [TextLocation; 2]) -> Option<Rectangle> {
        let [start, end] = sel;
        let mut result: Option<Rectangle> = None;

        for chunk in &self.chunks {
            if let Some(words) = self.text.get(&chunk.location) {
                for word in words {
                    if word.location >= start && word.location <= end {
                        let rect =
                            (word.rect * chunk.scale).to_rect() - chunk.frame.min + chunk.position;
                        if let Some(ref mut r) = result {
                            r.absorb(&rect);
                        } else {
                            result = Some(rect);
                        }
                    }
                }
            }
        }

        result
    }

    fn render_results(&self, rq: &mut RenderQueue) {
        for chunk in &self.chunks {
            if let Some(groups) = self
                .search
                .as_ref()
                .and_then(|s| s.highlights.get(&chunk.location))
            {
                for rects in groups {
                    let mut rect_opt: Option<Rectangle> = None;
                    for rect in rects {
                        let rect =
                            (*rect * chunk.scale).to_rect() - chunk.frame.min + chunk.position;
                        if let Some(ref mut r) = rect_opt {
                            r.absorb(&rect);
                        } else {
                            rect_opt = Some(rect);
                        }
                    }
                    if let Some(rect) = rect_opt {
                        rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                    }
                }
            }
        }
    }

    fn selection_rect(&self) -> Option<Rectangle> {
        self.selection
            .as_ref()
            .and_then(|sel| self.text_rect([sel.start, sel.end]))
    }

    fn find_annotation_ref(&mut self, sel: [TextLocation; 2]) -> Option<&Annotation> {
        self.info.reader.as_ref().and_then(|r| {
            r.annotations
                .iter()
                .find(|a| a.selection[0] == sel[0] && a.selection[1] == sel[1])
        })
    }

    fn find_annotation_mut(&mut self, sel: [TextLocation; 2]) -> Option<&mut Annotation> {
        self.info.reader.as_mut().and_then(|r| {
            r.annotations
                .iter_mut()
                .find(|a| a.selection[0] == sel[0] && a.selection[1] == sel[1])
        })
    }

    fn reseed(&mut self, rq: &mut RenderQueue, context: &mut Context) {
        if let Some(index) = locate::<TopBar>(self) {
            if let Some(top_bar) = self.child_mut(index).downcast_mut::<TopBar>() {
                top_bar.reseed(rq, context);
            }
        }

        rq.add(RenderData::new(self.id, self.rect, UpdateMode::Gui));
    }

    fn quit(&mut self, context: &mut Context) {
        if let Some(ref mut s) = self.search {
            s.running.store(false, AtomicOrdering::Relaxed);
        }

        if self.ephemeral {
            return;
        }

        if let Some(ref mut r) = self.info.reader {
            r.current_page = self.current_page;
            r.pages_count = self.pages_count;
            r.finished = self.finished;
            r.dithered = context.fb.dithered();

            if self.view_port.zoom_mode == ZoomMode::FitToPage {
                r.zoom_mode = None;
                r.page_offset = None;
            } else {
                r.zoom_mode = Some(self.view_port.zoom_mode);
                r.page_offset = Some(self.view_port.page_offset);
            }

            if self.view_port.zoom_mode == ZoomMode::FitToWidth {
                r.scroll_mode = Some(self.view_port.scroll_mode);
            } else {
                r.scroll_mode = None;
            }

            r.rotation = Some(CURRENT_DEVICE.to_canonical(context.display.rotation));

            if (self.contrast.exponent - DEFAULT_CONTRAST_EXPONENT).abs() > f32::EPSILON {
                r.contrast_exponent = Some(self.contrast.exponent);
                if (self.contrast.gray - DEFAULT_CONTRAST_GRAY).abs() > f32::EPSILON {
                    r.contrast_gray = Some(self.contrast.gray);
                } else {
                    r.contrast_gray = None;
                }
            } else {
                r.contrast_exponent = None;
                r.contrast_gray = None;
            }

            context.library.sync_reader_info(&self.info.file.path, r);
        }
    }

    fn scale_page(
        &mut self,
        center: Point,
        factor: f32,
        hub: &Hub,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) {
        if self.cache.is_empty() {
            return;
        }

        let current_factor = if let ZoomMode::Custom(sf) = self.view_port.zoom_mode {
            sf
        } else {
            self.cache[&self.current_page].scale
        };

        if let Some(chunk) = self.chunks.iter().find(|chunk| {
            let chunk_rect = chunk.frame - chunk.frame.min + chunk.position;
            chunk_rect.includes(center)
        }) {
            let smw = self.view_port.margin_width;
            let frame = self.cache[&chunk.location].frame;
            self.current_page = chunk.location;
            self.view_port.page_offset = Point::from(
                factor * Vec2::from(center - chunk.position + chunk.frame.min - frame.min),
            ) - pt!(
                self.rect.width() as i32 / 2 - smw,
                self.rect.height() as i32 / 2 - smw
            );

            self.set_zoom_mode(
                ZoomMode::Custom(current_factor * factor),
                false,
                hub,
                rq,
                context,
            );
        }
    }
}

impl View for Reader {
    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, hub, _bus, rq, context), fields(event = ?evt), ret(level=tracing::Level::TRACE)))]
    fn handle_event(
        &mut self,
        evt: &Event,
        hub: &Hub,
        _bus: &mut Bus,
        rq: &mut RenderQueue,
        context: &mut Context,
    ) -> bool {
        match *evt {
            Event::Gesture(GestureEvent::Rotate { quarter_turns, .. }) if quarter_turns != 0 => {
                let (_, dir) = CURRENT_DEVICE.mirroring_scheme();
                let n = (4 + (context.display.rotation - dir * quarter_turns)) % 4;
                hub.send(Event::Select(EntryId::Rotate(n))).ok();
                true
            }
            Event::Gesture(GestureEvent::Swipe { dir, start, end })
                if self.rect.includes(start) =>
            {
                match self.view_port.zoom_mode {
                    ZoomMode::FitToPage | ZoomMode::FitToWidth => {
                        match dir {
                            Dir::West => self.go_to_neighbor(CycleDir::Next, hub, rq, context),
                            Dir::East => self.go_to_neighbor(CycleDir::Previous, hub, rq, context),
                            Dir::South | Dir::North => {
                                self.vertical_scroll(start.y - end.y, hub, rq, context)
                            }
                        };
                    }
                    ZoomMode::Custom(_) => {
                        match dir {
                            Dir::West | Dir::East => {
                                self.directional_scroll(pt!(start.x - end.x, 0), hub, rq, context)
                            }
                            Dir::South | Dir::North => {
                                self.directional_scroll(pt!(0, start.y - end.y), hub, rq, context)
                            }
                        };
                    }
                }
                true
            }
            Event::Gesture(GestureEvent::SlantedSwipe { start, end, .. })
                if self.rect.includes(start) =>
            {
                if let ZoomMode::Custom(_) = self.view_port.zoom_mode {
                    self.directional_scroll(start - end, hub, rq, context);
                }
                true
            }
            Event::Gesture(GestureEvent::Spread {
                axis: Axis::Horizontal,
                center,
                ..
            }) if self.rect.includes(center) => {
                if !self.reflowable {
                    self.set_zoom_mode(ZoomMode::FitToWidth, true, hub, rq, context);
                }
                true
            }
            Event::Gesture(GestureEvent::Pinch {
                axis: Axis::Horizontal,
                center,
                ..
            }) if self.rect.includes(center) => {
                self.set_zoom_mode(ZoomMode::FitToPage, true, hub, rq, context);
                true
            }
            Event::Gesture(GestureEvent::Spread {
                axis: Axis::Vertical,
                center,
                ..
            }) if self.rect.includes(center) => {
                if !self.reflowable {
                    self.set_scroll_mode(ScrollMode::Screen, hub, rq, context);
                }
                true
            }
            Event::Gesture(GestureEvent::Pinch {
                axis: Axis::Vertical,
                center,
                ..
            }) if self.rect.includes(center) => {
                if !self.reflowable {
                    self.set_scroll_mode(ScrollMode::Page, hub, rq, context);
                }
                true
            }
            Event::Gesture(GestureEvent::Spread {
                axis: Axis::Diagonal,
                center,
                factor,
            })
            | Event::Gesture(GestureEvent::Pinch {
                axis: Axis::Diagonal,
                center,
                factor,
            }) if factor.is_finite() && self.rect.includes(center) => {
                self.scale_page(center, factor, hub, rq, context);
                true
            }
            Event::Gesture(GestureEvent::Arrow { dir, .. }) => {
                match dir {
                    Dir::West => {
                        if self.search.is_none() {
                            self.go_to_chapter(CycleDir::Previous, hub, rq, context);
                        } else {
                            self.go_to_results_page(0, hub, rq, context);
                        }
                    }
                    Dir::East => {
                        if self.search.is_none() {
                            self.go_to_chapter(CycleDir::Next, hub, rq, context);
                        } else {
                            let last_page = self.search.as_ref().unwrap().highlights.len() - 1;
                            self.go_to_results_page(last_page, hub, rq, context);
                        }
                    }
                    Dir::North => {
                        self.search_direction = LinearDir::Backward;
                        self.toggle_search_bar(true, hub, rq, context);
                    }
                    Dir::South => {
                        self.search_direction = LinearDir::Forward;
                        self.toggle_search_bar(true, hub, rq, context);
                    }
                }
                true
            }
            Event::Gesture(GestureEvent::Corner { dir, .. }) => {
                match dir {
                    DiagDir::NorthWest => self.go_to_bookmark(CycleDir::Previous, hub, rq, context),
                    DiagDir::NorthEast => self.go_to_bookmark(CycleDir::Next, hub, rq, context),
                    DiagDir::SouthEast => match context.settings.reader.bottom_right_gesture {
                        BottomRightGestureAction::ToggleDithered => {
                            hub.send(Event::Select(EntryId::ToggleDithered)).ok();
                        }
                        BottomRightGestureAction::ToggleInverted => {
                            hub.send(Event::Select(EntryId::ToggleInverted)).ok();
                        }
                    },
                    DiagDir::SouthWest => {
                        if context.settings.frontlight_presets.len() > 1 {
                            if context.settings.frontlight {
                                let lightsensor_level = if CURRENT_DEVICE.has_lightsensor() {
                                    context.lightsensor.level().ok()
                                } else {
                                    None
                                };
                                if let Some(ref frontlight_levels) = guess_frontlight(
                                    lightsensor_level,
                                    &context.settings.frontlight_presets,
                                ) {
                                    let LightLevels { intensity, warmth } = *frontlight_levels;
                                    context.frontlight.set_intensity(intensity);
                                    context.frontlight.set_warmth(warmth);
                                }
                            }
                        } else {
                            hub.send(Event::ToggleFrontlight).ok();
                        }
                    }
                };
                true
            }
            Event::Gesture(GestureEvent::MultiCorner { dir, .. }) => {
                match dir {
                    DiagDir::NorthWest => {
                        self.go_to_annotation(CycleDir::Previous, hub, rq, context)
                    }
                    DiagDir::NorthEast => self.go_to_annotation(CycleDir::Next, hub, rq, context),
                    _ => (),
                }
                true
            }
            Event::Gesture(GestureEvent::Cross(_)) => {
                self.quit(context);
                hub.send(Event::Back).ok();
                true
            }
            Event::Gesture(GestureEvent::Diamond(_)) => {
                self.toggle_bars(None, hub, rq, context);
                true
            }
            Event::Gesture(GestureEvent::HoldButtonShort(code, ..)) => {
                match code {
                    ButtonCode::Backward => {
                        self.go_to_chapter(CycleDir::Previous, hub, rq, context)
                    }
                    ButtonCode::Forward => self.go_to_chapter(CycleDir::Next, hub, rq, context),
                    _ => (),
                }
                self.held_buttons.insert(code);
                true
            }
            Event::Device(DeviceEvent::Button {
                code,
                status: ButtonStatus::Released,
                ..
            }) => {
                if !self.held_buttons.remove(&code) {
                    match code {
                        ButtonCode::Backward => {
                            if self.search.is_none() {
                                self.go_to_neighbor(CycleDir::Previous, hub, rq, context);
                            } else {
                                self.go_to_results_neighbor(CycleDir::Previous, hub, rq, context);
                            }
                        }
                        ButtonCode::Forward => {
                            if self.search.is_none() {
                                self.go_to_neighbor(CycleDir::Next, hub, rq, context);
                            } else {
                                self.go_to_results_neighbor(CycleDir::Next, hub, rq, context);
                            }
                        }
                        _ => (),
                    }
                }
                true
            }
            Event::Device(DeviceEvent::Finger {
                position,
                status: FingerStatus::Motion,
                id,
                ..
            }) if self.state == State::Selection(id) => {
                let mut nearest_word = None;
                let mut dmin = u32::MAX;
                let dmax =
                    (scale_by_dpi(RECT_DIST_JITTER, CURRENT_DEVICE.dpi) as i32).pow(2) as u32;
                let mut rects = Vec::new();

                for chunk in &self.chunks {
                    for word in &self.text[&chunk.location] {
                        let rect =
                            (word.rect * chunk.scale).to_rect() - chunk.frame.min + chunk.position;
                        rects.push((rect, word.location));
                        let d = position.rdist2(&rect);
                        if d < dmax && d < dmin {
                            dmin = d;
                            nearest_word = Some(word.clone());
                        }
                    }
                }

                let selection = self.selection.as_mut().unwrap();

                if let Some(word) = nearest_word {
                    let old_start = selection.start;
                    let old_end = selection.end;
                    let (start, end) = word.location.min_max(selection.anchor);

                    if start == old_start && end == old_end {
                        return true;
                    }

                    let (start_low, start_high) = old_start.min_max(start);
                    let (end_low, end_high) = old_end.min_max(end);

                    if start_low != start_high {
                        if let Some(mut i) = rects.iter().position(|(_, loc)| *loc == start_low) {
                            let mut rect = rects[i].0;
                            while rects[i].1 < start_high {
                                let next_rect = rects[i + 1].0;
                                if rect.max.y.min(next_rect.max.y) - rect.min.y.max(next_rect.min.y)
                                    > rect.height().min(next_rect.height()) as i32 / 2
                                {
                                    if rects[i + 1].1 == start_high {
                                        if rect.min.x < next_rect.min.x {
                                            rect.max.x = next_rect.min.x;
                                        } else {
                                            rect.min.x = next_rect.max.x;
                                        }
                                        rect.min.y = rect.min.y.min(next_rect.min.y);
                                        rect.max.y = rect.max.y.max(next_rect.max.y);
                                    } else {
                                        rect.absorb(&next_rect);
                                    }
                                } else {
                                    rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                                    rect = next_rect;
                                }
                                i += 1;
                            }
                            rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                        }
                    }

                    if end_low != end_high {
                        if let Some(mut i) = rects.iter().rposition(|(_, loc)| *loc == end_high) {
                            let mut rect = rects[i].0;
                            while rects[i].1 > end_low {
                                let prev_rect = rects[i - 1].0;
                                if rect.max.y.min(prev_rect.max.y) - rect.min.y.max(prev_rect.min.y)
                                    > rect.height().min(prev_rect.height()) as i32 / 2
                                {
                                    if rects[i - 1].1 == end_low {
                                        if rect.min.x > prev_rect.min.x {
                                            rect.min.x = prev_rect.max.x;
                                        } else {
                                            rect.max.x = prev_rect.min.x;
                                        }
                                        rect.min.y = rect.min.y.min(prev_rect.min.y);
                                        rect.max.y = rect.max.y.max(prev_rect.max.y);
                                    } else {
                                        rect.absorb(&prev_rect);
                                    }
                                } else {
                                    rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                                    rect = prev_rect;
                                }
                                i -= 1;
                            }
                            rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                        }
                    }

                    selection.start = start;
                    selection.end = end;
                }
                true
            }
            Event::Device(DeviceEvent::Finger {
                status: FingerStatus::Up,
                position,
                id,
                ..
            }) if self.state == State::Selection(id) => {
                self.state = State::Idle;
                let radius = scale_by_dpi(24.0, CURRENT_DEVICE.dpi) as i32;
                self.toggle_selection_menu(
                    Rectangle::from_disk(position, radius),
                    Some(true),
                    rq,
                    context,
                );
                true
            }
            Event::Gesture(GestureEvent::Tap(center))
                if self.state == State::AdjustSelection && self.rect.includes(center) =>
            {
                let mut found = None;
                let mut dmin = u32::MAX;
                let dmax =
                    (scale_by_dpi(RECT_DIST_JITTER, CURRENT_DEVICE.dpi) as i32).pow(2) as u32;
                let mut rects = Vec::new();

                for chunk in &self.chunks {
                    for word in &self.text[&chunk.location] {
                        let rect =
                            (word.rect * chunk.scale).to_rect() - chunk.frame.min + chunk.position;
                        rects.push((rect, word.location));
                        let d = center.rdist2(&rect);
                        if d < dmax && d < dmin {
                            dmin = d;
                            found = Some((word.clone(), rects.len() - 1));
                        }
                    }
                }

                let selection = self.selection.as_mut().unwrap();

                if let Some((word, index)) = found {
                    let old_start = selection.start;
                    let old_end = selection.end;

                    let (start, end) = if word.location <= old_start {
                        (word.location, old_end)
                    } else if word.location >= old_end {
                        (old_start, word.location)
                    } else {
                        let (start_index, end_index) = (
                            rects.iter().position(|(_, loc)| *loc == old_start),
                            rects.iter().position(|(_, loc)| *loc == old_end),
                        );
                        match (start_index, end_index) {
                            (Some(s), Some(e)) => {
                                if index - s > e - index {
                                    (old_start, word.location)
                                } else {
                                    (word.location, old_end)
                                }
                            }
                            (Some(..), None) => (word.location, old_end),
                            (None, Some(..)) => (old_start, word.location),
                            (None, None) => (old_start, old_end),
                        }
                    };

                    if start == old_start && end == old_end {
                        return true;
                    }

                    let (start_low, start_high) = old_start.min_max(start);
                    let (end_low, end_high) = old_end.min_max(end);

                    if start_low != start_high {
                        if let Some(mut i) = rects.iter().position(|(_, loc)| *loc == start_low) {
                            let mut rect = rects[i].0;
                            while i < rects.len() - 1 && rects[i].1 < start_high {
                                let next_rect = rects[i + 1].0;
                                if rect.min.y < next_rect.max.y && next_rect.min.y < rect.max.y {
                                    if rects[i + 1].1 == start_high {
                                        if rect.min.x < next_rect.min.x {
                                            rect.max.x = next_rect.min.x;
                                        } else {
                                            rect.min.x = next_rect.max.x;
                                        }
                                        rect.min.y = rect.min.y.min(next_rect.min.y);
                                        rect.max.y = rect.max.y.max(next_rect.max.y);
                                    } else {
                                        rect.absorb(&next_rect);
                                    }
                                } else {
                                    rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                                    rect = next_rect;
                                }
                                i += 1;
                            }
                            rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                        }
                    }

                    if end_low != end_high {
                        if let Some(mut i) = rects.iter().rposition(|(_, loc)| *loc == end_high) {
                            let mut rect = rects[i].0;
                            while i > 0 && rects[i].1 > end_low {
                                let prev_rect = rects[i - 1].0;
                                if rect.min.y < prev_rect.max.y && prev_rect.min.y < rect.max.y {
                                    if rects[i - 1].1 == end_low {
                                        if rect.min.x > prev_rect.min.x {
                                            rect.min.x = prev_rect.max.x;
                                        } else {
                                            rect.max.x = prev_rect.min.x;
                                        }
                                        rect.min.y = rect.min.y.min(prev_rect.min.y);
                                        rect.max.y = rect.max.y.max(prev_rect.max.y);
                                    } else {
                                        rect.absorb(&prev_rect);
                                    }
                                } else {
                                    rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                                    rect = prev_rect;
                                }
                                i -= 1;
                            }
                            rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                        }
                    }

                    selection.start = start;
                    selection.end = end;
                }
                true
            }
            Event::Gesture(GestureEvent::Tap(center)) if self.rect.includes(center) => {
                if self.focus.is_some() {
                    return true;
                }

                let mut nearest_link = None;
                let mut dmin = u32::MAX;
                let dmax =
                    (scale_by_dpi(RECT_DIST_JITTER, CURRENT_DEVICE.dpi) as i32).pow(2) as u32;

                for chunk in &self.chunks {
                    let (links, _) = self
                        .doc
                        .lock()
                        .ok()
                        .and_then(|mut doc| doc.links(Location::Exact(chunk.location)))
                        .unwrap_or((Vec::new(), 0));
                    for link in links {
                        let rect =
                            (link.rect * chunk.scale).to_rect() - chunk.frame.min + chunk.position;
                        let d = center.rdist2(&rect);
                        if d < dmax && d < dmin {
                            dmin = d;
                            nearest_link = Some(link.clone());
                        }
                    }
                }

                if let Some(link) = nearest_link.take() {
                    let pdf_page = Regex::new(r"^#page=(\d+).*$").unwrap();
                    let djvu_page = Regex::new(r"^#([+-])?(\d+)$").unwrap();
                    let toc_page = Regex::new(r"^@(.+)$").unwrap();
                    if let Some(caps) = toc_page.captures(&link.text) {
                        let loc_opt = if caps[1].chars().all(|c| c.is_digit(10)) {
                            caps[1].parse::<usize>().map(Location::Exact).ok()
                        } else {
                            Some(Location::Uri(caps[1].to_string()))
                        };
                        if let Some(location) = loc_opt {
                            self.quit(context);
                            hub.send(Event::Back).ok();
                            hub.send(Event::GoToLocation(location)).ok();
                        }
                    } else if let Some(caps) = pdf_page.captures(&link.text) {
                        if let Ok(index) = caps[1].parse::<usize>() {
                            self.go_to_page(index.saturating_sub(1), true, hub, rq, context);
                        }
                    } else if let Some(caps) = djvu_page.captures(&link.text) {
                        if let Ok(mut index) = caps[2].parse::<usize>() {
                            let prefix = caps.get(1).map(|m| m.as_str());
                            match prefix {
                                Some("-") => index = self.current_page.saturating_sub(index),
                                Some("+") => index += self.current_page,
                                _ => index = index.saturating_sub(1),
                            }
                            self.go_to_page(index, true, hub, rq, context);
                        }
                    } else {
                        let mut doc = self.doc.lock().unwrap();
                        let loc = Location::LocalUri(self.current_page, link.text.clone());
                        if let Some(location) = doc.resolve_location(loc) {
                            hub.send(Event::GoTo(location)).ok();
                        } else if link.text.starts_with("https:") || link.text.starts_with("http:")
                        {
                            if let Some(path) = context.settings.external_urls_queue.as_ref() {
                                if let Ok(mut file) =
                                    OpenOptions::new().create(true).append(true).open(path)
                                {
                                    if let Err(e) = writeln!(file, "{}", link.text) {
                                        error!("Couldn't write to {}: {:#}.", path.display(), e);
                                    } else {
                                        let message = format!("Queued {}.", link.text);
                                        let notif = Notification::new(
                                            None, message, false, hub, rq, context,
                                        );
                                        self.children.push(Box::new(notif) as Box<dyn View>);
                                    }
                                }
                            }
                        } else {
                            error!("Can't resolve URI: {}.", link.text);
                        }
                    }
                    return true;
                }

                if let ZoomMode::Custom(_) = self.view_port.zoom_mode {
                    let dx = self.rect.width() as i32 - 2 * self.view_port.margin_width;
                    let dy = self.rect.height() as i32 - 2 * self.view_port.margin_width;
                    match Region::from_point(
                        center,
                        self.rect,
                        context.settings.reader.strip_width,
                        context.settings.reader.corner_width,
                    ) {
                        Region::Corner(diag_dir) => match diag_dir {
                            DiagDir::NorthEast => {
                                self.directional_scroll(pt!(dx, -dy), hub, rq, context)
                            }
                            DiagDir::SouthEast => {
                                self.directional_scroll(pt!(dx, dy), hub, rq, context)
                            }
                            DiagDir::SouthWest => {
                                self.directional_scroll(pt!(-dx, dy), hub, rq, context)
                            }
                            DiagDir::NorthWest => {
                                self.directional_scroll(pt!(-dx, -dy), hub, rq, context)
                            }
                        },
                        Region::Strip(dir) => match dir {
                            Dir::North => self.directional_scroll(pt!(0, -dy), hub, rq, context),
                            Dir::East => self.directional_scroll(pt!(dx, 0), hub, rq, context),
                            Dir::South => self.directional_scroll(pt!(0, dy), hub, rq, context),
                            Dir::West => self.directional_scroll(pt!(-dx, 0), hub, rq, context),
                        },
                        Region::Center => self.toggle_bars(None, hub, rq, context),
                    }

                    return true;
                }

                match Region::from_point(
                    center,
                    self.rect,
                    context.settings.reader.strip_width,
                    context.settings.reader.corner_width,
                ) {
                    Region::Corner(diag_dir) => match diag_dir {
                        DiagDir::NorthWest => self.go_to_last_page(hub, rq, context),
                        DiagDir::NorthEast => self.toggle_bookmark(rq),
                        DiagDir::SouthEast => {
                            if self.search.is_none() {
                                match context.settings.reader.south_east_corner {
                                    SouthEastCornerAction::GoToPage => {
                                        hub.send(Event::Toggle(ToggleEvent::View(
                                            ViewId::GoToPage,
                                        )))
                                        .ok();
                                    }
                                    SouthEastCornerAction::NextPage => {
                                        self.go_to_neighbor(CycleDir::Next, hub, rq, context);
                                    }
                                }
                            } else {
                                self.go_to_neighbor(CycleDir::Next, hub, rq, context);
                            }
                        }
                        DiagDir::SouthWest => {
                            if self.search.is_none() {
                                if self.ephemeral
                                    && self.info.file.path == PathBuf::from(MEM_SCHEME)
                                {
                                    self.quit(context);
                                    hub.send(Event::Back).ok();
                                } else {
                                    hub.send(Event::Show(ViewId::TableOfContents)).ok();
                                }
                            } else {
                                self.go_to_neighbor(CycleDir::Previous, hub, rq, context);
                            }
                        }
                    },
                    Region::Strip(dir) => match dir {
                        Dir::West => {
                            if self.search.is_none() {
                                match context.settings.reader.west_strip {
                                    WestStripAction::PreviousPage => {
                                        self.go_to_neighbor(CycleDir::Previous, hub, rq, context);
                                    }
                                    WestStripAction::NextPage => {
                                        self.go_to_neighbor(CycleDir::Next, hub, rq, context);
                                    }
                                    WestStripAction::None => (),
                                }
                            } else {
                                self.go_to_results_neighbor(CycleDir::Previous, hub, rq, context);
                            }
                        }
                        Dir::East => {
                            if self.search.is_none() {
                                match context.settings.reader.east_strip {
                                    EastStripAction::PreviousPage => {
                                        self.go_to_neighbor(CycleDir::Previous, hub, rq, context);
                                    }
                                    EastStripAction::NextPage => {
                                        self.go_to_neighbor(CycleDir::Next, hub, rq, context);
                                    }
                                    EastStripAction::None => (),
                                }
                            } else {
                                self.go_to_results_neighbor(CycleDir::Next, hub, rq, context);
                            }
                        }
                        Dir::South => match context.settings.reader.south_strip {
                            SouthStripAction::ToggleBars => {
                                self.toggle_bars(None, hub, rq, context);
                            }
                            SouthStripAction::NextPage => {
                                self.go_to_neighbor(CycleDir::Next, hub, rq, context);
                            }
                        },
                        Dir::North => self.toggle_bars(None, hub, rq, context),
                    },
                    Region::Center => self.toggle_bars(None, hub, rq, context),
                }

                true
            }
            Event::Gesture(GestureEvent::HoldFingerShort(center, id))
                if self.rect.includes(center) =>
            {
                if self.focus.is_some() {
                    return true;
                }

                let mut found = None;
                let mut dmin = u32::MAX;
                let dmax =
                    (scale_by_dpi(RECT_DIST_JITTER, CURRENT_DEVICE.dpi) as i32).pow(2) as u32;

                if let Some(rect) = self.selection_rect() {
                    let d = center.rdist2(&rect);
                    if d < dmax {
                        self.state = State::Idle;
                        let radius = scale_by_dpi(24.0, CURRENT_DEVICE.dpi) as i32;
                        self.toggle_selection_menu(
                            Rectangle::from_disk(center, radius),
                            Some(true),
                            rq,
                            context,
                        );
                    }
                    return true;
                }

                for chunk in &self.chunks {
                    for word in &self.text[&chunk.location] {
                        let rect =
                            (word.rect * chunk.scale).to_rect() - chunk.frame.min + chunk.position;
                        let d = center.rdist2(&rect);
                        if d < dmax && d < dmin {
                            dmin = d;
                            found = Some((word.clone(), rect));
                        }
                    }
                }

                if let Some((nearest_word, rect)) = found {
                    let anchor = nearest_word.location;
                    if let Some(annot) = self
                        .annotations
                        .values()
                        .flatten()
                        .find(|annot| anchor >= annot.selection[0] && anchor <= annot.selection[1])
                        .cloned()
                    {
                        let radius = scale_by_dpi(24.0, CURRENT_DEVICE.dpi) as i32;
                        self.toggle_annotation_menu(
                            &annot,
                            Rectangle::from_disk(center, radius),
                            Some(true),
                            rq,
                            context,
                        );
                    } else {
                        self.selection = Some(Selection {
                            start: anchor,
                            end: anchor,
                            anchor,
                        });
                        self.state = State::Selection(id);
                        rq.add(RenderData::new(self.id, rect, UpdateMode::Fast));
                    }
                }

                true
            }
            Event::Gesture(GestureEvent::HoldFingerLong(center, _))
                if self.rect.includes(center) =>
            {
                if let Some(text) = self.selected_text() {
                    let query = text
                        .trim_matches(|c: char| !c.is_alphanumeric())
                        .to_string();
                    let language = self.info.language.clone();
                    hub.send(Event::Select(EntryId::Launch(AppCmd::Dictionary {
                        query,
                        language,
                    })))
                    .ok();
                }
                self.selection = None;
                self.state = State::Idle;
                true
            }
            Event::Update(mode) => {
                self.update(Some(mode), hub, rq, context);
                true
            }
            Event::LoadPixmap(location) => {
                self.load_pixmap(location);
                true
            }
            Event::Submit(ViewId::GoToPageInput, ref text) => {
                let re = Regex::new(r#"^([-+'])?(.+)$"#).unwrap();
                if let Some(caps) = re.captures(text) {
                    let prefix = caps.get(1).map(|m| m.as_str());
                    if prefix == Some("'") {
                        if let Some(location) = self.find_page_by_name(&caps[2]) {
                            self.go_to_page(location, true, hub, rq, context);
                        }
                    } else {
                        if text == "_" {
                            let location =
                                (context.rng.next_u64() % self.pages_count as u64) as usize;
                            self.go_to_page(location, true, hub, rq, context);
                        } else if text == "(" {
                            self.go_to_page(0, true, hub, rq, context);
                        } else if text == ")" {
                            self.go_to_page(
                                self.pages_count.saturating_sub(1),
                                true,
                                hub,
                                rq,
                                context,
                            );
                        } else if let Some(percent) = text.strip_suffix('%') {
                            if let Ok(number) = percent.parse::<f64>() {
                                let location =
                                    (number.max(0.0).min(100.0) / 100.0 * self.pages_count as f64)
                                        .round() as usize;
                                self.go_to_page(location, true, hub, rq, context);
                            }
                        } else if let Ok(number) = caps[2].parse::<f64>() {
                            let location = {
                                let bpp = if self.synthetic { BYTES_PER_PAGE } else { 1.0 };
                                let mut index = (number * bpp).max(0.0).round() as usize;
                                match prefix {
                                    Some("-") => index = self.current_page.saturating_sub(index),
                                    Some("+") => index += self.current_page,
                                    _ => index = index.saturating_sub(1 / (bpp as usize)),
                                }
                                index
                            };
                            self.go_to_page(location, true, hub, rq, context);
                        }
                    }
                }
                true
            }
            Event::Submit(ViewId::GoToResultsPageInput, ref text) => {
                if let Ok(index) = text.parse::<usize>() {
                    self.go_to_results_page(index.saturating_sub(1), hub, rq, context);
                }
                true
            }
            Event::Submit(ViewId::NamePageInput, ref text) => {
                if !text.is_empty() {
                    if let Some(ref mut r) = self.info.reader {
                        r.page_names.insert(self.current_page, text.to_string());
                    }
                }
                self.toggle_keyboard(false, None, hub, rq, context);
                true
            }
            Event::Submit(ViewId::EditNoteInput, ref note) => {
                let selection = self.selection.take().map(|sel| [sel.start, sel.end]);

                if let Some(sel) = selection {
                    let text = self.text_excerpt(sel).unwrap();
                    if let Some(r) = self.info.reader.as_mut() {
                        r.annotations.push(Annotation {
                            selection: sel,
                            note: note.to_string(),
                            text,
                            modified: Local::now().naive_local(),
                        });
                    }
                    if let Some(rect) = self.text_rect(sel) {
                        rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                    }
                } else {
                    if let Some(sel) = self.target_annotation.take() {
                        if let Some(annot) = self.find_annotation_mut(sel) {
                            annot.note = note.to_string();
                            annot.modified = Local::now().naive_local();
                        }
                        if let Some(rect) = self.text_rect(sel) {
                            rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                        }
                    }
                }

                self.update_annotations();
                self.toggle_keyboard(false, None, hub, rq, context);
                true
            }
            Event::Submit(ViewId::ReaderSearchInput, ref text) => {
                match make_query(text) {
                    Some(query) => {
                        self.search(text, query, hub, rq);
                        self.toggle_keyboard(false, None, hub, rq, context);
                        self.toggle_results_bar(true, rq, context);
                    }
                    None => {
                        let notif = Notification::new(
                            None,
                            "Invalid search query.".to_string(),
                            false,
                            hub,
                            rq,
                            context,
                        );
                        self.children.push(Box::new(notif) as Box<dyn View>);
                    }
                }
                true
            }
            Event::Page(dir) => {
                self.go_to_neighbor(dir, hub, rq, context);
                true
            }
            Event::GoTo(location) | Event::Select(EntryId::GoTo(location)) => {
                self.go_to_page(location, true, hub, rq, context);
                true
            }
            Event::GoToLocation(ref location) => {
                let offset_opt = {
                    let mut doc = self.doc.lock().unwrap();
                    doc.resolve_location(location.clone())
                };
                if let Some(offset) = offset_opt {
                    self.go_to_page(offset, true, hub, rq, context);
                }
                true
            }
            Event::Chapter(dir) => {
                self.go_to_chapter(dir, hub, rq, context);
                true
            }
            Event::ResultsPage(dir) => {
                self.go_to_results_neighbor(dir, hub, rq, context);
                true
            }
            Event::CropMargins(ref margin) => {
                let current_page = self.current_page;
                self.crop_margins(current_page, margin.as_ref(), hub, rq, context);
                true
            }
            Event::Toggle(ToggleEvent::View(ViewId::TopBottomBars)) => {
                self.toggle_bars(None, hub, rq, context);
                true
            }
            Event::Toggle(ToggleEvent::View(ViewId::GoToPage)) => {
                self.toggle_go_to_page(None, ViewId::GoToPage, hub, rq, context);
                true
            }
            Event::Toggle(ToggleEvent::View(ViewId::GoToResultsPage)) => {
                self.toggle_go_to_page(None, ViewId::GoToResultsPage, hub, rq, context);
                true
            }
            Event::Slider(SliderId::FontSize, font_size, FingerStatus::Up) => {
                self.set_font_size(font_size, hub, rq, context);
                true
            }
            Event::Slider(SliderId::ContrastExponent, exponent, FingerStatus::Up) => {
                self.set_contrast_exponent(exponent, hub, rq, context);
                true
            }
            Event::Slider(SliderId::ContrastGray, gray, FingerStatus::Up) => {
                self.set_contrast_gray(gray, hub, rq, context);
                true
            }
            Event::ToggleNear(ViewId::TitleMenu, rect) => {
                self.toggle_title_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::MainMenu, rect) => {
                toggle_main_menu(self, rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::BatteryMenu, rect) => {
                toggle_battery_menu(self, rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::ClockMenu, rect) => {
                toggle_clock_menu(self, rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::MarginCropperMenu, rect) => {
                self.toggle_margin_cropper_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::SearchMenu, rect) => {
                self.toggle_search_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::FontFamilyMenu, rect) => {
                self.toggle_font_family_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::FontSizeMenu, rect) => {
                self.toggle_font_size_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::TextAlignMenu, rect) => {
                self.toggle_text_align_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::MarginWidthMenu, rect) => {
                self.toggle_margin_width_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::LineHeightMenu, rect) => {
                self.toggle_line_height_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::ContrastExponentMenu, rect) => {
                self.toggle_contrast_exponent_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::ContrastGrayMenu, rect) => {
                self.toggle_contrast_gray_menu(rect, None, rq, context);
                true
            }
            Event::ToggleNear(ViewId::PageMenu, rect) => {
                self.toggle_page_menu(rect, None, rq, context);
                true
            }
            Event::Close(ViewId::MainMenu) => {
                toggle_main_menu(self, Rectangle::default(), Some(false), rq, context);
                true
            }
            Event::Close(ViewId::SearchBar) => {
                self.toggle_results_bar(false, rq, context);
                self.toggle_search_bar(false, hub, rq, context);
                if let Some(ref mut s) = self.search {
                    s.running.store(false, AtomicOrdering::Relaxed);
                    self.render_results(rq);
                    self.search = None;
                }
                true
            }
            Event::Close(ViewId::GoToPage) => {
                self.toggle_go_to_page(Some(false), ViewId::GoToPage, hub, rq, context);
                true
            }
            Event::Close(ViewId::GoToResultsPage) => {
                self.toggle_go_to_page(Some(false), ViewId::GoToResultsPage, hub, rq, context);
                true
            }
            Event::Close(ViewId::SelectionMenu) => {
                if self.state == State::Idle && self.target_annotation.is_none() {
                    if let Some(rect) = self.selection_rect() {
                        self.selection = None;
                        rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                    }
                }
                false
            }
            Event::Close(ViewId::EditNote) => {
                self.toggle_edit_note(None, Some(false), hub, rq, context);
                if let Some(rect) = self.selection_rect() {
                    self.selection = None;
                    rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                }
                self.target_annotation = None;
                false
            }
            Event::Close(ViewId::NamePage) => {
                self.toggle_keyboard(false, None, hub, rq, context);
                false
            }
            Event::Show(ViewId::TableOfContents) => {
                {
                    self.toggle_bars(Some(false), hub, rq, context);
                }
                let mut doc = self.doc.lock().unwrap();
                if let Some(toc) = self
                    .toc()
                    .or_else(|| doc.toc())
                    .filter(|toc| !toc.is_empty())
                {
                    let chap = doc.chapter(self.current_page, &toc).map(|(c, _)| c);
                    let chap_index = chap.map_or(usize::MAX, |chap| chap.index);
                    let html = toc_as_html(&toc, chap_index);
                    let link_uri = chap.and_then(|chap| match chap.location {
                        Location::Uri(ref uri) => Some(format!("@{}", uri)),
                        Location::Exact(offset) => Some(format!("@{}", offset)),
                        _ => None,
                    });
                    hub.send(Event::OpenHtml(html, link_uri)).ok();
                }
                true
            }
            Event::Select(EntryId::Annotations) => {
                self.toggle_bars(Some(false), hub, rq, context);
                let mut starts = self
                    .annotations
                    .values()
                    .flatten()
                    .map(|annot| annot.selection[0])
                    .collect::<Vec<TextLocation>>();
                starts.sort();
                let active_range = starts.first().cloned().zip(starts.last().cloned());
                if let Some(mut annotations) =
                    self.info.reader.as_ref().map(|r| &r.annotations).cloned()
                {
                    annotations.sort_by(|a, b| a.selection[0].cmp(&b.selection[0]));
                    let html = annotations_as_html(&annotations, active_range);
                    let link_uri = annotations
                        .iter()
                        .filter(|annot| annot.selection[0].location() <= self.current_page)
                        .max_by_key(|annot| annot.selection[0])
                        .map(|annot| format!("@{}", annot.selection[0].location()));
                    hub.send(Event::OpenHtml(html, link_uri)).ok();
                }
                true
            }
            Event::Select(EntryId::Bookmarks) => {
                self.toggle_bars(Some(false), hub, rq, context);
                if let Some(bookmarks) = self.info.reader.as_ref().map(|r| &r.bookmarks) {
                    let html = bookmarks_as_html(bookmarks, self.current_page, self.synthetic);
                    let link_uri = bookmarks
                        .range(..=self.current_page)
                        .next_back()
                        .map(|index| format!("@{}", index));
                    hub.send(Event::OpenHtml(html, link_uri)).ok();
                }
                true
            }
            Event::Show(ViewId::SearchBar) => {
                self.toggle_search_bar(true, hub, rq, context);
                true
            }
            Event::Show(ViewId::MarginCropper) => {
                self.toggle_margin_cropper(true, hub, rq, context);
                true
            }
            Event::Close(ViewId::MarginCropper) => {
                self.toggle_margin_cropper(false, hub, rq, context);
                true
            }
            Event::SearchResult(location, ref rects) => {
                if self.search.is_none() {
                    return true;
                }

                let mut results_count = 0;

                if let Some(ref mut s) = self.search {
                    let pages_count = s.highlights.len();
                    s.highlights
                        .entry(location)
                        .or_insert_with(Vec::new)
                        .push(rects.clone());
                    s.results_count += 1;
                    results_count = s.results_count;
                    if results_count > 1
                        && location <= self.current_page
                        && s.highlights.len() > pages_count
                    {
                        s.current_page += 1;
                    }
                }

                self.update_results_bar(rq);

                if results_count == 1 {
                    self.toggle_results_bar(false, rq, context);
                    self.toggle_search_bar(false, hub, rq, context);
                    self.go_to_page(location, true, hub, rq, context);
                } else if location == self.current_page {
                    self.update(None, hub, rq, context);
                }

                true
            }
            Event::EndOfSearch => {
                let results_count = self
                    .search
                    .as_ref()
                    .map(|s| s.results_count)
                    .unwrap_or(usize::MAX);
                if results_count == 0 {
                    let notif = Notification::new(
                        None,
                        "No search results.".to_string(),
                        false,
                        hub,
                        rq,
                        context,
                    );
                    self.children.push(Box::new(notif) as Box<dyn View>);
                    self.toggle_search_bar(true, hub, rq, context);
                    hub.send(Event::Focus(Some(ViewId::ReaderSearchInput))).ok();
                }
                true
            }
            Event::Select(EntryId::AnnotateSelection) => {
                self.toggle_edit_note(None, Some(true), hub, rq, context);
                true
            }
            Event::Select(EntryId::HighlightSelection) => {
                if let Some(sel) = self.selection.take() {
                    let text = self.text_excerpt([sel.start, sel.end]).unwrap();
                    if let Some(r) = self.info.reader.as_mut() {
                        r.annotations.push(Annotation {
                            selection: [sel.start, sel.end],
                            note: String::new(),
                            text,
                            modified: Local::now().naive_local(),
                        });
                    }
                    if let Some(rect) = self.text_rect([sel.start, sel.end]) {
                        rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                    }
                    self.update_annotations();
                }

                true
            }
            Event::Select(EntryId::DefineSelection) => {
                if let Some(text) = self.selected_text() {
                    let query = text
                        .trim_matches(|c: char| !c.is_alphanumeric())
                        .to_string();
                    let language = self.info.language.clone();
                    hub.send(Event::Select(EntryId::Launch(AppCmd::Dictionary {
                        query,
                        language,
                    })))
                    .ok();
                }
                self.selection = None;
                true
            }
            Event::Select(EntryId::SearchForSelection) => {
                if let Some(text) = self.selected_text() {
                    let text = text.trim_matches(|c: char| !c.is_alphanumeric());
                    match make_query(text) {
                        Some(query) => {
                            self.search(text, query, hub, rq);
                        }
                        None => {
                            let notif = Notification::new(
                                None,
                                "Invalid search query.".to_string(),
                                false,
                                hub,
                                rq,
                                context,
                            );
                            self.children.push(Box::new(notif) as Box<dyn View>);
                        }
                    }
                }
                if let Some(rect) = self.selection_rect() {
                    rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                }
                self.selection = None;
                true
            }
            Event::Select(EntryId::GoToSelectedPageName) => {
                if let Some(loc) = self.selected_text().and_then(|text| {
                    let end = text
                        .find(|c: char| {
                            !c.is_ascii_digit()
                                && Digit::from_char(c).is_err()
                                && !c.is_ascii_uppercase()
                        })
                        .unwrap_or_else(|| text.len());
                    self.find_page_by_name(&text[..end])
                }) {
                    self.go_to_page(loc, true, hub, rq, context);
                }
                if let Some(rect) = self.selection_rect() {
                    rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                }
                self.selection = None;
                true
            }
            Event::Select(EntryId::AdjustSelection) => {
                self.state = State::AdjustSelection;
                true
            }
            Event::Select(EntryId::EditAnnotationNote(sel)) => {
                let text = self
                    .find_annotation_ref(sel)
                    .map(|annot| annot.note.clone());
                self.toggle_edit_note(text, Some(true), hub, rq, context);
                self.target_annotation = Some(sel);
                true
            }
            Event::Select(EntryId::RemoveAnnotationNote(sel)) => {
                if let Some(annot) = self.find_annotation_mut(sel) {
                    annot.note.clear();
                    annot.modified = Local::now().naive_local();
                    self.update_annotations();
                }
                if let Some(rect) = self.text_rect(sel) {
                    rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                }
                true
            }
            Event::Select(EntryId::RemoveAnnotation(sel)) => {
                if let Some(annotations) = self.info.reader.as_mut().map(|r| &mut r.annotations) {
                    annotations.retain(|annot| {
                        annot.selection[0] != sel[0] || annot.selection[1] != sel[1]
                    });
                    self.update_annotations();
                }
                if let Some(rect) = self.text_rect(sel) {
                    rq.add(RenderData::new(self.id, rect, UpdateMode::Gui));
                }
                true
            }
            Event::Select(EntryId::SetZoomMode(zoom_mode)) => {
                self.set_zoom_mode(zoom_mode, true, hub, rq, context);
                true
            }
            Event::Select(EntryId::SetScrollMode(scroll_mode)) => {
                self.set_scroll_mode(scroll_mode, hub, rq, context);
                true
            }
            Event::Select(EntryId::Save) => {
                let name = format!(
                    "{}-{}.{}",
                    self.info.title.to_lowercase().replace(' ', "_"),
                    Local::now().format("%Y%m%d_%H%M%S"),
                    self.info.file.kind
                );
                let doc = self.doc.lock().unwrap();
                let msg = match doc.save(&name) {
                    Err(e) => format!("{}", e),
                    Ok(()) => format!("Saved {}.", name),
                };
                let notif = Notification::new(None, msg, false, hub, rq, context);
                self.children.push(Box::new(notif) as Box<dyn View>);
                true
            }
            Event::Select(EntryId::ApplyCroppings(index, scheme)) => {
                self.info.reader.as_mut().map(|r| {
                    if r.cropping_margins.is_none() {
                        r.cropping_margins = Some(CroppingMargins::Any(Margin::default()));
                    }
                    r.cropping_margins.as_mut().map(|c| c.apply(index, scheme))
                });
                true
            }
            Event::Select(EntryId::RemoveCroppings) => {
                if let Some(r) = self.info.reader.as_mut() {
                    r.cropping_margins = None;
                }
                self.cache.clear();
                self.update(None, hub, rq, context);
                true
            }
            Event::Select(EntryId::SearchDirection(dir)) => {
                self.search_direction = dir;
                true
            }
            Event::Select(EntryId::SetFontFamily(ref font_family)) => {
                self.set_font_family(font_family, hub, rq, context);
                true
            }
            Event::Select(EntryId::SetTextAlign(text_align)) => {
                self.set_text_align(text_align, hub, rq, context);
                true
            }
            Event::Select(EntryId::SetFontSize(v)) => {
                let font_size = self
                    .info
                    .reader
                    .as_ref()
                    .and_then(|r| r.font_size)
                    .unwrap_or(context.settings.reader.font_size);
                let font_size = font_size - 1.0 + v as f32 / 10.0;
                self.set_font_size(font_size, hub, rq, context);
                true
            }
            Event::Select(EntryId::SetMarginWidth(width)) => {
                self.set_margin_width(width, hub, rq, context);
                true
            }
            Event::Select(EntryId::SetLineHeight(v)) => {
                let line_height = 1.0 + v as f32 / 10.0;
                self.set_line_height(line_height, hub, rq, context);
                true
            }
            Event::Select(EntryId::SetContrastExponent(v)) => {
                let exponent = 1.0 + v as f32 / 2.0;
                self.set_contrast_exponent(exponent, hub, rq, context);
                true
            }
            Event::Select(EntryId::SetContrastGray(v)) => {
                let gray = ((1 << 8) - (1 << (8 - v))) as f32;
                self.set_contrast_gray(gray, hub, rq, context);
                true
            }
            Event::Select(EntryId::SetPageName) => {
                self.toggle_name_page(None, hub, rq, context);
                true
            }
            Event::Select(EntryId::RemovePageName) => {
                if let Some(ref mut r) = self.info.reader {
                    r.page_names.remove(&self.current_page);
                }
                true
            }
            Event::Select(EntryId::ToggleInverted) => {
                self.update_noninverted_regions(!context.fb.inverted());
                false
            }
            Event::Reseed => {
                self.reseed(rq, context);
                true
            }
            Event::ToggleFrontlight => {
                if let Some(index) = locate::<TopBar>(self) {
                    self.child_mut(index)
                        .downcast_mut::<TopBar>()
                        .unwrap()
                        .update_frontlight_icon(rq, context);
                }
                true
            }
            Event::Device(DeviceEvent::Button {
                code: ButtonCode::Home,
                status: ButtonStatus::Pressed,
                ..
            }) => {
                self.quit(context);
                hub.send(Event::Back).ok();
                true
            }
            Event::Select(EntryId::Quit)
            | Event::Select(EntryId::Reboot)
            | Event::Select(EntryId::Restart)
            | Event::Back
            | Event::Suspend => {
                self.quit(context);
                false
            }
            Event::Focus(v) => {
                if self.focus != v {
                    if let Some(ViewId::ReaderSearchInput) = v {
                        self.toggle_results_bar(false, rq, context);
                        if let Some(ref mut s) = self.search {
                            s.running.store(false, AtomicOrdering::Relaxed);
                        }
                        self.render_results(rq);
                        self.search = None;
                    }
                    self.focus = v;
                    if v.is_some() {
                        self.toggle_keyboard(true, v, hub, rq, context);
                    }
                }
                true
            }
            _ => false,
        }
    }

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, fb, _fonts), fields(rect = ?rect)))]
    fn render(&self, fb: &mut dyn Framebuffer, rect: Rectangle, _fonts: &mut Fonts) {
        fb.draw_rectangle(&rect, WHITE);

        for chunk in &self.chunks {
            let Resource {
                ref pixmap, scale, ..
            } = self.cache[&chunk.location];
            let chunk_rect = chunk.frame - chunk.frame.min + chunk.position;

            if let Some(region_rect) = rect.intersection(&chunk_rect) {
                let chunk_frame = region_rect - chunk.position + chunk.frame.min;
                let chunk_position = region_rect.min;
                fb.draw_framed_pixmap_contrast(
                    pixmap,
                    &chunk_frame,
                    chunk_position,
                    self.contrast.exponent,
                    self.contrast.gray,
                );

                if let Some(rects) = self.noninverted_regions.get(&chunk.location) {
                    for r in rects {
                        let rect = (*r * scale).to_rect() - chunk.frame.min + chunk.position;
                        if let Some(ref image_rect) = rect.intersection(&region_rect) {
                            fb.invert_region(image_rect);
                        }
                    }
                }

                if let Some(groups) = self
                    .search
                    .as_ref()
                    .and_then(|s| s.highlights.get(&chunk.location))
                {
                    for rects in groups {
                        let mut last_rect: Option<Rectangle> = None;
                        for r in rects {
                            let rect = (*r * scale).to_rect() - chunk.frame.min + chunk.position;
                            if let Some(ref search_rect) = rect.intersection(&region_rect) {
                                fb.invert_region(search_rect);
                            }
                            if let Some(last) = last_rect {
                                if rect.max.y.min(last.max.y) - rect.min.y.max(last.min.y)
                                    > rect.height().min(last.height()) as i32 / 2
                                    && (last.max.x < rect.min.x || rect.max.x < last.min.x)
                                {
                                    let space = if last.max.x < rect.min.x {
                                        rect![
                                            last.max.x,
                                            (last.min.y + rect.min.y) / 2,
                                            rect.min.x,
                                            (last.max.y + rect.max.y) / 2
                                        ]
                                    } else {
                                        rect![
                                            rect.max.x,
                                            (last.min.y + rect.min.y) / 2,
                                            last.min.x,
                                            (last.max.y + rect.max.y) / 2
                                        ]
                                    };
                                    if let Some(ref res_rect) = space.intersection(&region_rect) {
                                        fb.invert_region(res_rect);
                                    }
                                }
                            }
                            last_rect = Some(rect);
                        }
                    }
                }

                if let Some(annotations) = self.annotations.get(&chunk.location) {
                    for annot in annotations {
                        let drift = if annot.note.is_empty() {
                            HIGHLIGHT_DRIFT
                        } else {
                            ANNOTATION_DRIFT
                        };
                        let [start, end] = annot.selection;
                        if let Some(text) = self.text.get(&chunk.location) {
                            let mut last_rect: Option<Rectangle> = None;
                            for word in text
                                .iter()
                                .filter(|w| w.location >= start && w.location <= end)
                            {
                                let rect = (word.rect * scale).to_rect() - chunk.frame.min
                                    + chunk.position;
                                if let Some(ref sel_rect) = rect.intersection(&region_rect) {
                                    fb.shift_region(sel_rect, drift);
                                }
                                if let Some(last) = last_rect {
                                    // Are `rect` and `last` on the same line?
                                    if rect.max.y.min(last.max.y) - rect.min.y.max(last.min.y)
                                        > rect.height().min(last.height()) as i32 / 2
                                        && (last.max.x < rect.min.x || rect.max.x < last.min.x)
                                    {
                                        let space = if last.max.x < rect.min.x {
                                            rect![
                                                last.max.x,
                                                (last.min.y + rect.min.y) / 2,
                                                rect.min.x,
                                                (last.max.y + rect.max.y) / 2
                                            ]
                                        } else {
                                            rect![
                                                rect.max.x,
                                                (last.min.y + rect.min.y) / 2,
                                                last.min.x,
                                                (last.max.y + rect.max.y) / 2
                                            ]
                                        };
                                        if let Some(ref sel_rect) = space.intersection(&region_rect)
                                        {
                                            fb.shift_region(sel_rect, drift);
                                        }
                                    }
                                }
                                last_rect = Some(rect);
                            }
                        }
                    }
                }

                if let Some(sel) = self.selection.as_ref() {
                    if let Some(text) = self.text.get(&chunk.location) {
                        let mut last_rect: Option<Rectangle> = None;
                        for word in text
                            .iter()
                            .filter(|w| w.location >= sel.start && w.location <= sel.end)
                        {
                            let rect =
                                (word.rect * scale).to_rect() - chunk.frame.min + chunk.position;
                            if let Some(ref sel_rect) = rect.intersection(&region_rect) {
                                fb.invert_region(sel_rect);
                            }
                            if let Some(last) = last_rect {
                                if rect.max.y.min(last.max.y) - rect.min.y.max(last.min.y)
                                    > rect.height().min(last.height()) as i32 / 2
                                    && (last.max.x < rect.min.x || rect.max.x < last.min.x)
                                {
                                    let space = if last.max.x < rect.min.x {
                                        rect![
                                            last.max.x,
                                            (last.min.y + rect.min.y) / 2,
                                            rect.min.x,
                                            (last.max.y + rect.max.y) / 2
                                        ]
                                    } else {
                                        rect![
                                            rect.max.x,
                                            (last.min.y + rect.min.y) / 2,
                                            last.min.x,
                                            (last.max.y + rect.max.y) / 2
                                        ]
                                    };
                                    if let Some(ref sel_rect) = space.intersection(&region_rect) {
                                        fb.invert_region(sel_rect);
                                    }
                                }
                            }
                            last_rect = Some(rect);
                        }
                    }
                }
            }
        }

        if self
            .info
            .reader
            .as_ref()
            .map_or(false, |r| r.bookmarks.contains(&self.current_page))
        {
            let dpi = CURRENT_DEVICE.dpi;
            let thickness = scale_by_dpi(3.0, dpi) as u16;
            let radius = mm_to_px(0.4, dpi) as i32 + thickness as i32;
            let center = pt!(self.rect.max.x - 5 * radius, self.rect.min.y + 5 * radius);
            fb.draw_rounded_rectangle_with_border(
                &Rectangle::from_disk(center, radius),
                &CornerSpec::Uniform(radius),
                &BorderSpec {
                    thickness,
                    color: WHITE,
                },
                &BLACK,
            );
        }
    }

    fn render_rect(&self, rect: &Rectangle) -> Rectangle {
        rect.intersection(&self.rect).unwrap_or(self.rect)
    }

    fn resize(&mut self, rect: Rectangle, hub: &Hub, rq: &mut RenderQueue, context: &mut Context) {
        if !self.children.is_empty() {
            let dpi = CURRENT_DEVICE.dpi;
            let thickness = scale_by_dpi(THICKNESS_MEDIUM, dpi) as i32;
            let (small_thickness, big_thickness) = halves(thickness);
            let (small_height, big_height) = (
                scale_by_dpi(SMALL_BAR_HEIGHT, dpi) as i32,
                scale_by_dpi(BIG_BAR_HEIGHT, dpi) as i32,
            );
            let mut floating_layer_start = 0;

            self.children.retain(|child| !child.is::<Menu>());

            if self.children[0].is::<TopBar>() {
                let top_bar_rect = rect![
                    rect.min.x,
                    rect.min.y,
                    rect.max.x,
                    small_height - small_thickness
                ];
                self.children[0].resize(top_bar_rect, hub, rq, context);
                let separator_rect = rect![
                    rect.min.x,
                    small_height - small_thickness,
                    rect.max.x,
                    small_height + big_thickness
                ];
                self.children[1].resize(separator_rect, hub, rq, context);
            } else if self.children[0].is::<Filler>() {
                let mut index = 1;
                if self.children[index].is::<SearchBar>() {
                    let sb_rect = rect![
                        rect.min.x,
                        rect.max.y - (3 * big_height + 2 * small_height) as i32 + big_thickness,
                        rect.max.x,
                        rect.max.y - (3 * big_height + small_height) as i32 - small_thickness
                    ];
                    self.children[index].resize(sb_rect, hub, rq, context);
                    self.children[index - 1].resize(
                        rect![
                            rect.min.x,
                            sb_rect.min.y - thickness,
                            rect.max.x,
                            sb_rect.min.y
                        ],
                        hub,
                        rq,
                        context,
                    );
                    index += 2;
                }
                if self.children[index].is::<Keyboard>() {
                    let kb_rect = rect![
                        rect.min.x,
                        rect.max.y - (small_height + 3 * big_height) as i32 + big_thickness,
                        rect.max.x,
                        rect.max.y - small_height - small_thickness
                    ];
                    self.children[index].resize(kb_rect, hub, rq, context);
                    self.children[index + 1].resize(
                        rect![
                            rect.min.x,
                            kb_rect.max.y,
                            rect.max.x,
                            kb_rect.max.y + thickness
                        ],
                        hub,
                        rq,
                        context,
                    );
                    let kb_rect = *self.children[index].rect();
                    self.children[index - 1].resize(
                        rect![
                            rect.min.x,
                            kb_rect.min.y - thickness,
                            rect.max.x,
                            kb_rect.min.y
                        ],
                        hub,
                        rq,
                        context,
                    );
                    index += 2;
                }
                floating_layer_start = index;
            }

            if let Some(mut index) = locate::<BottomBar>(self) {
                floating_layer_start = index + 1;
                let separator_rect = rect![
                    rect.min.x,
                    rect.max.y - small_height - small_thickness,
                    rect.max.x,
                    rect.max.y - small_height + big_thickness
                ];
                self.children[index - 1].resize(separator_rect, hub, rq, context);
                let bottom_bar_rect = rect![
                    rect.min.x,
                    rect.max.y - small_height + big_thickness,
                    rect.max.x,
                    rect.max.y
                ];
                self.children[index].resize(bottom_bar_rect, hub, rq, context);

                index -= 2;

                while index > 2 {
                    let bar_height = if self.children[index].is::<ToolBar>() {
                        2 * big_height
                    } else if self.children[index].is::<Keyboard>() {
                        3 * big_height
                    } else {
                        small_height
                    } as i32;

                    let y_max = self.children[index + 1].rect().min.y;
                    let bar_rect = rect![
                        rect.min.x,
                        y_max - bar_height + thickness,
                        rect.max.x,
                        y_max
                    ];
                    self.children[index].resize(bar_rect, hub, rq, context);
                    let y_max = self.children[index].rect().min.y;
                    let sp_rect = rect![rect.min.x, y_max - thickness, rect.max.x, y_max];
                    self.children[index - 1].resize(sp_rect, hub, rq, context);

                    index -= 2;
                }
            }

            for i in floating_layer_start..self.children.len() {
                self.children[i].resize(rect, hub, rq, context);
            }
        }

        match self.view_port.zoom_mode {
            ZoomMode::FitToWidth => {
                // Apply the scale change.
                let ratio = (rect.width() as i32 - 2 * self.view_port.margin_width) as f32
                    / (self.rect.width() as i32 - 2 * self.view_port.margin_width) as f32;
                self.view_port.page_offset.y = (self.view_port.page_offset.y as f32 * ratio) as i32;
            }
            ZoomMode::Custom(_) => {
                // Keep the center still.
                self.view_port.page_offset += pt!(
                    self.rect.width() as i32 - rect.width() as i32,
                    self.rect.height() as i32 - rect.height() as i32
                ) / 2;
            }
            _ => (),
        }

        self.rect = rect;

        if self.reflowable {
            let font_size = self
                .info
                .reader
                .as_ref()
                .and_then(|r| r.font_size)
                .unwrap_or(context.settings.reader.font_size);
            let mut doc = self.doc.lock().unwrap();
            doc.layout(rect.width(), rect.height(), font_size, CURRENT_DEVICE.dpi);
            let current_page = self.current_page.min(doc.pages_count() - 1);
            if let Some(location) = doc.resolve_location(Location::Exact(current_page)) {
                self.current_page = location;
            }
            self.text.clear();
        }

        self.cache.clear();
        self.update(Some(UpdateMode::Full), hub, rq, context);
    }

    fn might_rotate(&self) -> bool {
        self.search.is_none()
    }

    fn is_background(&self) -> bool {
        true
    }

    fn rect(&self) -> &Rectangle {
        &self.rect
    }

    fn rect_mut(&mut self) -> &mut Rectangle {
        &mut self.rect
    }

    fn children(&self) -> &Vec<Box<dyn View>> {
        &self.children
    }

    fn children_mut(&mut self) -> &mut Vec<Box<dyn View>> {
        &mut self.children
    }

    fn id(&self) -> Id {
        self.id
    }
}