Fix #4214 - Update AttachedDropShadow visual on layout/visibility #4230
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michael-hawker
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ghost
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…ment layout changes and visibility changes
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@michael-hawker Update fixes all the scenarios I tested in my sample project. Thanks, Michael! |
| private static void BindSizeAndScale(CompositionObject source, UIElement target) | ||
| { | ||
| var visual = ElementCompositionPreview.GetElementVisual(target); | ||
| var bindSizeAnimation = source.Compositor.CreateExpressionAnimation($"{nameof(visual)}.Size * {nameof(visual)}.Scale.XY"); |
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Please tell me there was a document describing how to do this?
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Kind of? https://docs.microsoft.com/uwp/api/Windows.UI.Composition.ExpressionAnimation
I just asked @Sergio0694 😋. We have helpers in the Toolkit for this, but they're in the Animations package and we don't want to include references to that everywhere.
I also just copied this from the Media package from another internal method and tweaked it... But yeah it is a bit of black magic.
| @@ -166,6 +167,16 @@ protected internal override void OnElementContextUninitialized(AttachedShadowEle | |||
| _container.Children.Remove(context.SpriteVisual); | |||
| } | |||
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| context.SpriteVisual?.StopAnimation("Size"); | |||
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@Sergio0694 any other clean-up I need to do beyond this to clean-up the composition animation?
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Don't think so, the actual objects would just be disposed normally, we're not doing any specific cleanup in other places of the animation package either, it's mostly just fire and forget as usual. Stopping these animations is the only important bit because otherwise the composition layer will just keep them always active even if the XAML object is gone, but other than that we should be good 😄
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Fixes #4214
We weren't updating the shadow visual if the parent element's visibility changed or layout was effected by other elements.
PR Type
What is the current behavior?
In some scenarios the shadow wouldn't be updated by the changes to the parent element.
What is the new behavior?
Shadow is now updated in more scenarios (though maybe not all). We should properly handle
Visibility,Scale, and some changes due to Layout updates.Note: I tried with
Canvasfrom the implicit animation sample and it seems Canvas moving an object doesn't callLayoutUpdatedon that element... wonder if that's a framework bug (this was the closest open one I could find)? Otherwise, not sure how we detect that in the element...PR Checklist
Please check if your PR fulfills the following requirements:
Other information
@zateutsch you hadn't attached your sample project. Did you want to see if the Preview Package spit out by the CI works in your test project?