Transition arguments about acorn HOT 3 CLOSED

For now, Bravo will not provide any specific mechanism to pass information about transition animations through the library. Developers can easily provide their own static data structures to share data, or store data directly in the view.

The Bravo notes app implementation shows how this could be done.

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The main usage for this is shared element transitions where an animation starts at a specific clicked item, such as the one below. For this specific animation, the coordinates and size of the specific view are needed.

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Passing transition arguments from the UI layer through the presentation layer back to the UI layer may be an option for this. An arbitrary key-value map can be used to store the necessary information the Transition implementation needs.

This causes the View to know about the details of the Transition however: what are the exact values the transition needs (x, y, width, height) instead of a more generic "this view was clicked". Passing a View instance through the presentation layer may cause a whole set of leaking problems to arise.

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