分层窗口与模糊效果

时间:2014-12-11 21:13:22

标签: c# wpf blurry

我非常喜欢可以在iOS中看到的效果,其基本上看起来像是在当前视图顶部绘制的图层,使视觉内容模糊并将其用作背景。有没有办法在WPF中实现类似的东西?

iOS

我看到人们主要在窗口级别处理这种模糊/透明度,但我需要在窗口内。

我们说这是我窗口的内容。

<StackPanel HorizontalAlignment="Center" Orientation="Horizontal">
        <Image  Source="pack://application:,,,/Resources/Penguins.jpg"/>
        <Image  Source="pack://application:,,,/Resources/Penguins.jpg"/>
</StackPanel>

看起来像

No layer

现在我想在其上面绘制一些东西(而不是使用红色背景),在它下面的任何地方使用它并将其用作背景,保持它的内容不是blury。

    <DockPanel Margin="15" Background="Red">
        <StackPanel Orientation="Horizontal"  VerticalAlignment="Center" HorizontalAlignment="Center">
            <Label Content="Some label"/>
            <TextBox Width="100" Height="20"/>
        </StackPanel>
    </DockPanel>

Blur layer

1 个答案:

答案 0 :(得分:4)

<强>结果:

WPF with blurred background

  • 我们将在网格中使用分层。背景:您的主要应用内容。前景:您的伪对话框背景模糊。

  • 我们将背景放在边框中,并通过其名称引用此边框。这将在VisualBrush中使用,并提供我们的模糊图像。

  • 前景也是分层网格。背景:一个矩形,用画笔填充并使用模糊效果。前景:无论你想成为什么样的人。

    1. 添加对System.Windows.Interactivity

    2. 的引用
    3. 添加以下行为代码:

      using System;
      using System.Collections.Generic;
      using System.Linq;
      using System.Windows;
      using System.Windows.Controls;
      using System.Windows.Data;
      using System.Windows.Interactivity;
      using System.Windows.Media;
      using System.Windows.Media.Effects;
      using System.Windows.Shapes;
      
      namespace WpfApplication1
      {
          public class BlurBackgroundBehavior : Behavior<Shape>
          {
              public static readonly DependencyProperty BlurContainerProperty
                  = DependencyProperty.Register(
                                                "BlurContainer",
                                                typeof (UIElement),
                                                typeof (BlurBackgroundBehavior),
                                                new PropertyMetadata(OnContainerChanged));
      
              private static readonly DependencyProperty BrushProperty
                  = DependencyProperty.Register(
                                                "Brush",
                                                typeof (VisualBrush),
                                                typeof (BlurBackgroundBehavior), 
                                                new PropertyMetadata());
      
              private VisualBrush Brush
              {
                  get { return (VisualBrush) this.GetValue(BrushProperty); }
                  set { this.SetValue(BrushProperty, value); }
              }
      
              public UIElement BlurContainer
              {
                  get { return (UIElement) this.GetValue(BlurContainerProperty); }
                  set { this.SetValue(BlurContainerProperty, value); }
              }
      
              protected override void OnAttached()
              {
                  this.AssociatedObject.Effect = new BlurEffect
                                                 {
                                                     Radius = 80,
                                                     KernelType = KernelType.Gaussian,
                                                     RenderingBias = RenderingBias.Quality
                                                 };
      
                  this.AssociatedObject.SetBinding(Shape.FillProperty,
                                                   new Binding
                                                   {
                                                       Source = this,
                                                       Path = new PropertyPath(BrushProperty)
                                                   });
      
                  this.AssociatedObject.LayoutUpdated += (sender, args) => this.UpdateBounds();
                  this.UpdateBounds();
              }
      
              protected override void OnDetaching()
              {
                  BindingOperations.ClearBinding(this.AssociatedObject, Border.BackgroundProperty);
              }
      
              private static void OnContainerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
              {
                  ((BlurBackgroundBehavior) d).OnContainerChanged((UIElement) e.OldValue, (UIElement) e.NewValue);
              }
      
              private void OnContainerChanged(UIElement oldValue, UIElement newValue)
              {
                  if (oldValue != null)
                  {
                      oldValue.LayoutUpdated -= this.OnContainerLayoutUpdated;
                  }
      
                  if (newValue != null)
                  {
                      this.Brush = new VisualBrush(newValue)
                                   {
                                       ViewboxUnits = BrushMappingMode.Absolute
                                   };
      
                      newValue.LayoutUpdated += this.OnContainerLayoutUpdated;
                      this.UpdateBounds();
                  }
                  else
                  {
                      this.Brush = null;
                  }
              }
      
              private void OnContainerLayoutUpdated(object sender, EventArgs eventArgs)
              {
                  this.UpdateBounds();
              }
      
              private void UpdateBounds()
              {
                  if (this.AssociatedObject != null && this.BlurContainer != null && this.Brush != null)
                  {
                      Point difference = this.AssociatedObject.TranslatePoint(new Point(), this.BlurContainer);
                      this.Brush.Viewbox = new Rect(difference, this.AssociatedObject.RenderSize);
                  }
              }
          }
      }
      
    4. 在XAML中使用它,如下所示:

      <Grid>
      
          <Border x:Name="content">
              <Border.Background>
                  <ImageBrush ImageSource="bild1.jpg" />
              </Border.Background>
      
              <StackPanel>
                  <TextBox Width="200" Margin="10" />
                  <TextBox Width="200" Margin="10" />
                  <TextBox Width="200" Margin="10" />
              </StackPanel>
          </Border>
      
          <Grid Margin="59,63,46,110"> 
      
              <Rectangle ClipToBounds="True">
                  <i:Interaction.Behaviors>
                      <wpfApplication1:BlurBackgroundBehavior BlurContainer="{Binding ElementName=content}" />
                  </i:Interaction.Behaviors>
              </Rectangle>
      
              <TextBox VerticalAlignment="Center" Text="Blah" Width="200" Height="30" />
      
          </Grid>
      
      </Grid>