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Strech animation for CupertinoSliverNavigationBar #62298

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#110127
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Strech animation for CupertinoSliverNavigationBar#62298
#110127
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P3Issues that are less important to the Flutter projecta: animationAnimation APIsa: fidelityMatching the OEM platforms bettera: qualityA truly polished experiencec: new featureNothing broken; request for a new capabilityc: proposalA detailed proposal for a change to Flutterf: cupertinoflutter/packages/flutter/cupertino repositoryf: scrollingViewports, list views, slivers, etc.frameworkflutter/packages/flutter repository. See also f: labels.platform-iosiOS applications specifically
@tidann

Description

@tidann
tidann
opened on Jul 26, 2020

Use case

On iOS 13, the Sliver Navigation Bar "stretchs" when overscrolling. This is also a feature in Material Design, with the stretch property of SliverNavigationBar associated with FlexibleSpaceBar 's stretchModes. However this feature is not included in the CupertinoSliverNavigationBar class in Flutter.

Proposal

Add this type of stretch animation to CupertinoSliverNavigationBar.
Illustrations :

Current behaviour

current_behaviour

Expected behaviour

expected_behaviour

Material equivalent

material_equivalent

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    P3Issues that are less important to the Flutter projecta: animationAnimation APIsa: fidelityMatching the OEM platforms bettera: qualityA truly polished experiencec: new featureNothing broken; request for a new capabilityc: proposalA detailed proposal for a change to Flutterf: cupertinoflutter/packages/flutter/cupertino repositoryf: scrollingViewports, list views, slivers, etc.frameworkflutter/packages/flutter repository. See also f: labels.platform-iosiOS applications specifically

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