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Signal layout request when CollectionView is in a layout #13612
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hartez
added
the
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jsuarezruiz
approved these changes
Feb 2, 2021
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The failing tests seem to be unrelated ( |
The iOS 14 failures in the Bugzilla tests are unrelated, but the iOS 13 test failure is definitely real; looking into it now. |
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Closing this in favor of #13640. |
samhouts
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Description of Change
#13370 added a watch for the IsVisible property change to signal a layout request to the UICollectionView control. Since it was 4.8 and using the old deferred layout resolution, there was no need to signal to Forms layouts that a layout update was necessary, as a re-layout due to the IsVisible change was already on the queue.
In 5.0 layout resolution is on-demand, so the UICollectionView's LayoutIfNeeded must be called to signal that a full layout is due. These changes add that call, and automated tests to verify that visibility changes work for a CollectionView inside of a Layout where the visibility is determined by a DataTrigger or IValueConverter.
Issues Resolved
IsVisiblemodified via a binding/trigger #13551API Changes
None
Platforms Affected
Behavioral/Visual Changes
None
Before/After Screenshots
Not applicable
Testing Procedure
Automated UI test
PR Checklist