Stop iOS SetNeedsLayout propagation by looking at VisualElement computed Constraint#28479
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rmarinho merged 4 commits intodotnet:mainfrom Apr 14, 2025
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Hey there @albyrock87! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed. |
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This was referenced Apr 9, 2025
rmarinho
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Apr 11, 2025
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Description of Change
#26629 removed
SetNeedsLayoutpropagation via inheritance, this was needed to fix #24996.Unfortunately, this also removed the ability to intercept and stop propagation as needed.
This PR enhances what we've done in the previous one by giving the stop-propagation control back to the platform view by returning a boolean on
bool IPlatformMeasureInvalidationController.InvalidateMeasure(bool isPropagating).MauiViewnow looks at the computedinternal LayoutConstraint Constraint => ComputedConstraint | SelfConstraint;property to see whether the view has fixed constraints.This is achieved by checking whether we're propagating and
CrossPlatformLayout is IConstrainedView { HasFixedConstraints: true }.Pagenow implements that interface with a fixed=> trueso I've been able to remove the hardcoded stop propagation logicif (superview is ContentView { IsPage: true } or UIScrollView)completely.This fixes the attached issue because it allows (unfortunately only via reflection for now), to set
VisualElement.SelfConstrainttoFixed = 3on a node to stop the propagation.That said this automatically solves use cases where the user is setting
WidthRequestandHeightRequestto a fixed value.Issues Fixed
Fixes #28410