View Framework: Component lifecycle

Overview

To make development easier, and remove boilerplate, a lifecycle is provided, so that all views and screens can override a few methods to get accurate access to their perceived state on screen. the lifecycle methods are invoked as follows:

• initialize - invoked once, when _initializeView is called for the view, or the view is created by a TabController, or added to a NavController
• onFirstShow - invoked once, when the view first becomes visible
• onShow - can be invoked multiple times
• onHide - can be invoked multiple times
• onGainedFocus - called whenever the view or one of it's children gains focus
• onLostFocus - called whenever the view loses focus
• onAddedToAggregateView(aggregateView) - this view was added to an aggregate view
• onRemovedFromAggregateView(aggregateView) - this view was removed to an aggregate view