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| Original file line number | Diff line number | Diff line change |
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| <ResourceDictionary | ||
| xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | ||
| xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | ||
| xmlns:local="using:AIDevGallery.Controls"> | ||
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| <Style BasedOn="{StaticResource DefaultOpacityMaskViewStyle}" TargetType="local:OpacityMaskView" /> | ||
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| <Style x:Key="DefaultOpacityMaskViewStyle" TargetType="local:OpacityMaskView"> | ||
| <Setter Property="IsTabStop" Value="False" /> | ||
| <Setter Property="HorizontalContentAlignment" Value="Left" /> | ||
| <Setter Property="VerticalContentAlignment" Value="Top" /> | ||
| <Setter Property="Template"> | ||
| <Setter.Value> | ||
| <ControlTemplate TargetType="local:OpacityMaskView"> | ||
| <Grid | ||
| x:Name="PART_RootGrid" | ||
| HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" | ||
| VerticalAlignment="{TemplateBinding VerticalContentAlignment}"> | ||
| <Border | ||
| x:Name="PART_MaskContainer" | ||
| Child="{TemplateBinding OpacityMask}" | ||
| IsHitTestVisible="False" /> | ||
| <ContentPresenter | ||
| x:Name="PART_ContentPresenter" | ||
| Content="{TemplateBinding Content}" | ||
| ContentTemplate="{TemplateBinding ContentTemplate}" /> | ||
| </Grid> | ||
| </ControlTemplate> | ||
| </Setter.Value> | ||
| </Setter> | ||
| </Style> | ||
| </ResourceDictionary> |
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| @@ -0,0 +1,105 @@ | ||
| // Copyright (c) Microsoft Corporation. All rights reserved. | ||
| // Licensed under the MIT License. | ||
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| using Microsoft.UI.Composition; | ||
| using Microsoft.UI.Xaml; | ||
| using Microsoft.UI.Xaml.Controls; | ||
| using Microsoft.UI.Xaml.Hosting; | ||
| using Microsoft.UI.Xaml.Media; | ||
| using System.Numerics; | ||
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| namespace AIDevGallery.Controls; | ||
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| /// <summary> | ||
| /// A control that applies an opacity mask to its content. | ||
| /// </summary> | ||
| [TemplatePart(Name = RootGridTemplateName, Type = typeof(Grid))] | ||
| [TemplatePart(Name = MaskContainerTemplateName, Type = typeof(Border))] | ||
| [TemplatePart(Name = ContentPresenterTemplateName, Type = typeof(ContentPresenter))] | ||
| public partial class OpacityMaskView : ContentControl | ||
| { | ||
| // This is from Windows Community Toolkit Labs: https://github.com/CommunityToolkit/Labs-Windows/pull/491 | ||
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| /// <summary> | ||
| /// Identifies the <see cref="OpacityMask"/> property. | ||
| /// </summary> | ||
| public static readonly DependencyProperty OpacityMaskProperty = | ||
| DependencyProperty.Register(nameof(OpacityMask), typeof(UIElement), typeof(OpacityMaskView), new PropertyMetadata(null, OnOpacityMaskChanged)); | ||
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| private const string ContentPresenterTemplateName = "PART_ContentPresenter"; | ||
| private const string MaskContainerTemplateName = "PART_MaskContainer"; | ||
| private const string RootGridTemplateName = "PART_RootGrid"; | ||
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| private readonly Compositor _compositor = CompositionTarget.GetCompositorForCurrentThread(); | ||
| private CompositionBrush? _mask; | ||
| private CompositionMaskBrush? _maskBrush; | ||
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| /// <summary> | ||
| /// Initializes a new instance of the <see cref="OpacityMaskView"/> class. | ||
| /// Creates a new instance of the <see cref="OpacityMaskView"/> class. | ||
| /// </summary> | ||
| public OpacityMaskView() | ||
| { | ||
| DefaultStyleKey = typeof(OpacityMaskView); | ||
| } | ||
|
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| /// <summary> | ||
| /// Gets or sets a <see cref="UIElement"/> as the opacity mask that is applied to alpha-channel masking for the rendered content of the content. | ||
| /// </summary> | ||
| public UIElement? OpacityMask | ||
| { | ||
| get => (UIElement?)GetValue(OpacityMaskProperty); | ||
| set => SetValue(OpacityMaskProperty, value); | ||
| } | ||
|
|
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| /// <inheritdoc /> | ||
| protected override void OnApplyTemplate() | ||
| { | ||
| base.OnApplyTemplate(); | ||
|
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| Grid rootGrid = (Grid)GetTemplateChild(RootGridTemplateName); | ||
| ContentPresenter contentPresenter = (ContentPresenter)GetTemplateChild(ContentPresenterTemplateName); | ||
| Border maskContainer = (Border)GetTemplateChild(MaskContainerTemplateName); | ||
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| _maskBrush = _compositor.CreateMaskBrush(); | ||
| _maskBrush.Source = GetVisualBrush(contentPresenter); | ||
| _mask = GetVisualBrush(maskContainer); | ||
| _maskBrush.Mask = OpacityMask is null ? null : _mask; | ||
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| SpriteVisual redirectVisual = _compositor.CreateSpriteVisual(); | ||
| redirectVisual.RelativeSizeAdjustment = Vector2.One; | ||
| redirectVisual.Brush = _maskBrush; | ||
| ElementCompositionPreview.SetElementChildVisual(rootGrid, redirectVisual); | ||
| } | ||
|
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| private static CompositionBrush GetVisualBrush(UIElement element) | ||
| { | ||
| Visual visual = ElementCompositionPreview.GetElementVisual(element); | ||
|
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| Compositor compositor = visual.Compositor; | ||
|
|
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| CompositionVisualSurface visualSurface = compositor.CreateVisualSurface(); | ||
| visualSurface.SourceVisual = visual; | ||
| ExpressionAnimation sourceSizeAnimation = compositor.CreateExpressionAnimation($"{nameof(visual)}.Size"); | ||
| sourceSizeAnimation.SetReferenceParameter(nameof(visual), visual); | ||
| visualSurface.StartAnimation(nameof(visualSurface.SourceSize), sourceSizeAnimation); | ||
|
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| CompositionSurfaceBrush brush = compositor.CreateSurfaceBrush(visualSurface); | ||
|
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| visual.Opacity = 0; | ||
|
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| return brush; | ||
| } | ||
|
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| private static void OnOpacityMaskChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) | ||
| { | ||
| OpacityMaskView self = (OpacityMaskView)d; | ||
| if (self._maskBrush is not { } maskBrush) | ||
| { | ||
| return; | ||
| } | ||
|
|
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| UIElement? opacityMask = (UIElement?)e.NewValue; | ||
| maskBrush.Mask = opacityMask is null ? null : self._mask; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1 +1,2 @@ | ||
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| <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" /> |
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