我正在试验一个链接效果,并将其设置在图像控件(TestImage(上,如下所示:
private void TestImage_ImageOpened(object sender, RoutedEventArgs e)
{
/*
(input) Backdrop -> GaussianBlur -> |
ColorSource -> | Blend -> Saturation (output)
*/
var compositor = ElementCompositionPreview.GetElementVisual(this.TestImage).Compositor;
var blurEffect = new GaussianBlurEffect()
{
Name = "Blur",
BlurAmount = 10f,
BorderMode = EffectBorderMode.Hard,
Optimization = EffectOptimization.Balanced,
Source = new CompositionEffectSourceParameter("source"),
};
var colorEffect = new ColorSourceEffect
{
Name = "Tint",
};
var blendEffect = new BlendEffect
{
Background = blurEffect,
Foreground = colorEffect,
Mode = BlendEffectMode.Overlay,
};
var saturationEffect = new SaturationEffect
{
Name = "Saturation",
Source = blendEffect,
Saturation = 1.5f,
};
var factory = compositor.CreateEffectFactory(saturationEffect, new[]
{
"Blur.BlurAmount",
"Tint.Color",
"Saturation.Saturation",
});
var brush = factory.CreateBrush();
brush.SetSourceParameter("source", compositor.CreateBackdropBrush());
// Animatable properties
brush.Properties.InsertScalar("Blur.BlurAmount", 10f);
brush.Properties.InsertColor("Tint.Color", Color.FromArgb(128, 255, 0, 0));
brush.Properties.InsertScalar("Saturation.Saturation", 1.5f);
var sprite = compositor.CreateSpriteVisual();
sprite.Brush = brush;
sprite.Size = new Vector2((float)this.TestImage.ActualWidth, (float)this.TestImage.ActualHeight);
ElementCompositionPreview.SetElementChildVisual(this.TestImage, sprite);
}
我的目标是稍后检索该效果,以便我可以读取有关该效果的一些值。如何仅使用 TestImage 控件和合成图层获得效果?
我使用附加属性解决了我的问题,因为此功能本身不受支持:
internal static SpriteVisual GetSprite(DependencyObject obj) => (SpriteVisual)obj.GetValue(SpriteProperty);
internal static void SetSprite(DependencyObject obj, SpriteVisual value) => obj.SetValue(SpriteProperty, value);
/// <summary>
/// Composition Sprite attached to a FrameworkElement.
/// </summary>
internal static readonly DependencyProperty SpriteProperty =
DependencyProperty.RegisterAttached(
"Sprite",
typeof(SpriteVisual),
typeof(MyAnimations),
new PropertyMetadata(null));