DropShadow Класс

Определение

public ref class DropShadow sealed : CompositionShadow

/// [Windows.Foundation.Metadata.ContractVersion(Microsoft.Foundation.LiftedContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class DropShadow final : CompositionShadow

/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
/// [Windows.Foundation.Metadata.ContractVersion(Microsoft.Foundation.WindowsAppSDKContract, 65536)]
class DropShadow final : CompositionShadow

[Windows.Foundation.Metadata.ContractVersion(typeof(Microsoft.Foundation.LiftedContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class DropShadow : CompositionShadow

[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
[Windows.Foundation.Metadata.ContractVersion(typeof(Microsoft.Foundation.WindowsAppSDKContract), 65536)]
public sealed class DropShadow : CompositionShadow

Public NotInheritable Class DropShadow
Inherits CompositionShadow

Наследование

Object Platform::Object IInspectable CompositionObject CompositionShadow DropShadow

Атрибуты

ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Примеры

Простой DropShadow

private async void InitComposition()
{
  _compositor = ElementCompositionPreview.GetElementVisual(MyGrid).Compositor;
  _imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);

  //Create surface brush and load image
  CompositionSurfaceBrush surfaceBrush = _compositor.CreateSurfaceBrush();
  surfaceBrush.Surface = await _imageLoader.LoadImageFromUriAsync(new Uri("ms-appx:///Assets/cat.jpg"));

  //Create sprite visual
  SpriteVisual visual = _compositor.CreateSpriteVisual();
  visual.Brush = surfaceBrush;
  visual.Size = new Vector2(270, 200);

  //Create drop shadow
  DropShadow shadow = _compositor.CreateDropShadow();
  shadow.BlurRadius = 5;
  shadow.Offset = new Vector3(15, 15, -10);
  shadow.Color = Colors.DarkGray;

  //Associate shadow with visual
  visual.Shadow = shadow;
}         

DropShadow с анимациями

private async void InitComposition()
{
  _compositor = ElementCompositionPreview.GetElementVisual(MyGrid).Compositor;
  _imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);

  //Create surface brush and load image
  CompositionSurfaceBrush surfaceBrush = _compositor.CreateSurfaceBrush();
  surfaceBrush.Surface = await _imageLoader.LoadImageFromUriAsync(new Uri("ms-appx:///Assets/cat.jpg"));

  //Create sprite visual
  SpriteVisual visual = _compositor.CreateSpriteVisual();
  visual.Brush = surfaceBrush;
  visual.Size = new Vector2(270, 200);

  //Create drop shadow
  DropShadow shadow = _compositor.CreateDropShadow();
  shadow.BlurRadius = 5;
  shadow.Offset = new Vector3(15, 15, -10);
  shadow.Color = Colors.DarkGray;

  //Create animations
  ScalarKeyFrameAnimation blurAnimation = this.CreateBlurAnimation();
  Vector3KeyFrameAnimation offsetAnimation = this.CreateOffsetAnimation();

  //Apply animations
  shadow.StartAnimation("BlurRadius", blurAnimation);
  shadow.StartAnimation("Offset", offsetAnimation);

  //Associate shadow with visual
  visual.Shadow = shadow;
}

private ScalarKeyFrameAnimation CreateBlurAnimation()
{
  ScalarKeyFrameAnimation shadowBlurAnimation = _compositor.CreateScalarKeyFrameAnimation();
  shadowBlurAnimation.InsertKeyFrame(0.0f, 5.0f);
  shadowBlurAnimation.InsertKeyFrame(0.5f, 20.0f);
  shadowBlurAnimation.InsertKeyFrame(1.0f, 5.0f);
  shadowBlurAnimation.Duration = TimeSpan.FromSeconds(2);
  shadowBlurAnimation.IterationBehavior = AnimationIterationBehavior.Forever;

  return shadowBlurAnimation;
}

private Vector3KeyFrameAnimation CreateOffsetAnimation()
{
  Vector3 startOffset = new Vector3(15, 15, -10);
  Vector3 endOffset = new Vector3(30, 30, -20);

  Vector3KeyFrameAnimation offsetAnimation = _compositor.CreateVector3KeyFrameAnimation();
  offsetAnimation.InsertKeyFrame(0.0f, startOffset);
  offsetAnimation.InsertKeyFrame(0.5f, endOffset);
  offsetAnimation.InsertKeyFrame(1.0f, startOffset);
  offsetAnimation.Duration = TimeSpan.FromSeconds(2);
  offsetAnimation.IterationBehavior = AnimationIterationBehavior.Forever;

  return offsetAnimation;
}         

DropShadow с помощью CompositionDropShadowSourcePolicy наследует альфа от кисти визуального элемента

private async void InitComposition()
{
  _compositor = ElementCompositionPreview.GetElementVisual(MyGrid).Compositor;

  //Create surface brush and load image
  CompositionSurfaceBrush surfaceBrush = _compositor.CreateSurfaceBrush();
  surfaceBrush.Surface = LoadedImageSurface.StartLoadFromUri(new Uri("ms-appx:///Assets/circle.png"));

  //Create sprite visual
  SpriteVisual visual = _compositor.CreateSpriteVisual();
  visual.Brush = surfaceBrush;
  visual.Size = new Vector2(270, 200);

  //Create drop shadow
  DropShadow shadow = _compositor.CreateDropShadow();
  shadow.BlurRadius = 5;
  shadow.Offset = new Vector3(15, 15, -10);
  shadow.Color = Colors.DarkGray;

  //Specify mask policy for shadow
  shadow.SourcePolicy = CompositionDropShadowSourcePolicy.InheritFromVisualContent;

  //Associate shadow with visual
  visual.Shadow = shadow;
}         

Комментарии

DropShadows — это распространенный способ указания глубины в пользовательском интерфейсе приложения. Чтобы добавить DropShadow, создайте экземпляр DropShadow и подключите его с помощью . Свойство Shadow в SpriteVisual или LayerVisual.

Тени не обрезаются неявным набором клипа в визуальном элементе (в зависимости от размера визуального элемента). Тем не менее тени учитывают явно заданный клип в визуальном элементе с помощью свойства SpriteVisual.Clip.

Свойства

Методы

Применяется к

См. также раздел

• CompositionShadow
• IClosable