diff --git a/src/Avalonia.Base/Rendering/Composition/CompositingRenderer.cs b/src/Avalonia.Base/Rendering/Composition/CompositingRenderer.cs index 98a6a3600e..38d9b34937 100644 --- a/src/Avalonia.Base/Rendering/Composition/CompositingRenderer.cs +++ b/src/Avalonia.Base/Rendering/Composition/CompositingRenderer.cs @@ -146,8 +146,18 @@ public class CompositingRenderer : IRendererWithCompositor return result == 0 ? lhs.index.CompareTo(rhs.index) : result; }); } - - if (compositionChildren.Count == visualChildren.Count) + + var childVisual = v.ChildCompositionVisual; + + // Check if the current visual somehow got migrated to another compositor + if (childVisual != null && childVisual.Compositor != v.CompositionVisual.Compositor) + childVisual = null; + + var expectedCount = visualChildren.Count; + if (childVisual != null) + expectedCount++; + + if (compositionChildren.Count == expectedCount) { bool mismatch = false; if (sortedChildren != null) @@ -167,6 +177,9 @@ public class CompositingRenderer : IRendererWithCompositor break; } + if (childVisual != null && + !ReferenceEquals(compositionChildren[compositionChildren.Count - 1], childVisual)) + mismatch = true; if (!mismatch) { @@ -193,6 +206,9 @@ public class CompositingRenderer : IRendererWithCompositor if (compositionChild != null) compositionChildren.Add(compositionChild); } + + if (childVisual != null) + compositionChildren.Add(childVisual); } private void UpdateCore() diff --git a/src/Avalonia.Base/Rendering/Composition/Compositor.Factories.cs b/src/Avalonia.Base/Rendering/Composition/Compositor.Factories.cs index 1a13d23acd..00fa7b3315 100644 --- a/src/Avalonia.Base/Rendering/Composition/Compositor.Factories.cs +++ b/src/Avalonia.Base/Rendering/Composition/Compositor.Factories.cs @@ -29,4 +29,7 @@ public partial class Compositor public ImplicitAnimationCollection CreateImplicitAnimationCollection() => new ImplicitAnimationCollection(this); public CompositionAnimationGroup CreateAnimationGroup() => new CompositionAnimationGroup(this); + + public CompositionSolidColorVisual CreateSolidColorVisual() => + new(this, new ServerCompositionSolidColorVisual(Server)); } \ No newline at end of file diff --git a/src/Avalonia.Base/Rendering/Composition/ElementCompositionPreview.cs b/src/Avalonia.Base/Rendering/Composition/ElementCompositionPreview.cs index 5bd8e4a4d3..b01321edd8 100644 --- a/src/Avalonia.Base/Rendering/Composition/ElementCompositionPreview.cs +++ b/src/Avalonia.Base/Rendering/Composition/ElementCompositionPreview.cs @@ -1,5 +1,8 @@ // Special license applies License.md +using System; +using Avalonia.VisualTree; + namespace Avalonia.Rendering.Composition; /// @@ -13,4 +16,22 @@ public static class ElementComposition /// /// public static CompositionVisual? GetElementVisual(Visual visual) => visual.CompositionVisual; + + /// + /// Sets a custom as the last child of the element’s visual tree. + /// + public static void SetElementChildVisual(Visual visual, CompositionVisual? compositionVisual) + { + if (compositionVisual != null && visual.CompositionVisual != null && + compositionVisual.Compositor != visual.CompositionVisual.Compositor) + throw new InvalidOperationException("Composition visuals belong to different compositor instances"); + + visual.ChildCompositionVisual = compositionVisual; + visual.GetVisualRoot()?.Renderer.RecalculateChildren(visual); + } + + /// + /// Retrieves a object previously set by a call to . + /// + public static CompositionVisual? GetElementChildVisual(Visual visual) => visual.ChildCompositionVisual; } diff --git a/src/Avalonia.Base/Rendering/Composition/Server/ServerCompositionSolidColorVisual.cs b/src/Avalonia.Base/Rendering/Composition/Server/ServerCompositionSolidColorVisual.cs new file mode 100644 index 0000000000..79abd7ee17 --- /dev/null +++ b/src/Avalonia.Base/Rendering/Composition/Server/ServerCompositionSolidColorVisual.cs @@ -0,0 +1,11 @@ +using Avalonia.Media.Immutable; + +namespace Avalonia.Rendering.Composition.Server; + +internal partial class ServerCompositionSolidColorVisual +{ + protected override void RenderCore(CompositorDrawingContextProxy canvas, Rect currentTransformedClip) + { + canvas.DrawRectangle(new ImmutableSolidColorBrush(Color), null, new Rect(0, 0, Size.X, Size.Y)); + } +} \ No newline at end of file diff --git a/src/Avalonia.Base/Visual.cs b/src/Avalonia.Base/Visual.cs index 29559a8618..d12eb1d138 100644 --- a/src/Avalonia.Base/Visual.cs +++ b/src/Avalonia.Base/Visual.cs @@ -292,6 +292,7 @@ namespace Avalonia protected IRenderRoot? VisualRoot => _visualRoot ?? (this as IRenderRoot); internal CompositionDrawListVisual? CompositionVisual { get; private set; } + internal CompositionVisual? ChildCompositionVisual { get; set; } public bool HasNonUniformZIndexChildren { get; private set; } diff --git a/src/Avalonia.Base/composition-schema.xml b/src/Avalonia.Base/composition-schema.xml index e0e177da44..6dfcb2e74d 100644 --- a/src/Avalonia.Base/composition-schema.xml +++ b/src/Avalonia.Base/composition-schema.xml @@ -27,6 +27,9 @@ + + +