[framework] create animation from value listenable #108644
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The idea with this is that instead of: You can do: |
goderbauer
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Jul 29, 2022
| import 'package:flutter_test/flutter_test.dart'; | ||
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| void main() { | ||
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| /// | ||
| /// The returned animation will always have an animations status of | ||
| /// [AnimationStatus.forward]. The value of the provided listenable can | ||
| /// be optionally transformed using the [transformer] function. |
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Bonus points if you add the example from this comment here to showcase the API and how it can simplify things.
goderbauer
approved these changes
Jul 29, 2022
| /// }, | ||
| /// child: Container( | ||
| /// child: Text('Hello, Animation'), | ||
| /// ), |
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nit: the analyzer will hopefully tell you, but I think this is missing a closing ) for the ValueListenableBuilder?
| /// }) | ||
| /// child: Container( | ||
| /// child: Text('Hello, Animation'), | ||
| /// ), |
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I've noticed a number of patterns in a certain customer app, where there is a desire to animate some part of the UI (opacity for example) based on something that is available via a value listenable (scroll position). Because there is no easy way to create an animation from a value listenable, I see a lot of ValueListenableBuilders used to animate things that could be FadeTransitions. This has the distinct disadvantage of bypassing the repaint boundary mechanisms introduced into animated opacities.