Module view

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Views are organized as a tree. A view might receive / send events and render itself.

The z-level of the n-th child of a view is less or equal to the z-level of its n+1-th child.

Events travel from the root to the leaves, only the leaf views will handle the root events, but any view can send events to its parent. From the events it receives from its children, a view resends the ones it doesn’t handle to its own parent. Hence an event sent from a child might bubble up to the root. If it reaches the root without being captured by any view, then it will be written to the main event channel and will be sent to every leaf in one of the next loop iterations.