WPF事件触发器添加BlurEffect

Question

在某些情况下，我想给我的窗口添加一个模糊效果，所以我写了一个自定义窗口样式。-I写了一个自定义样式，因为我在模糊效果前面有按钮，在应用模糊效果时会变得可见，但是这些按钮不应该变得模糊。

我使用了以下代码来应用模糊：

<AdornerDecorator.Effect>
  <BlurEffect Radius="{Binding Path=(local:StandardWindowEventHandler.LockedOverlayVisibility),
                       Converter={StaticResource VisibilityToBlurConverter}}"
              KernelType="Gaussian" />
</AdornerDecorator.Effect>

，这很好，但是当我在我的TreeView中的时候，GPU在50%左右，即使半径是0。无模糊效应，约为2%。现在我不想再设置半径，而是整个模糊效果。

我试过这样做：

<AdornerDecorator.Triggers>
    <DataTrigger Binding="{Binding Path=(local:StandardWindowEventHandler.LockedOverlayVisibility)}"
                 Value="Visible">
            <Setter TargetName="PART_WindowAdornerDecorator"
                Property="Effect">
            <Setter.Value>
                <BlurEffect Radius="10" />
            </Setter.Value>
        </Setter>
    </DataTrigger>
</AdornerDecorator.Triggers>

不幸的是，触发器应该是事件触发器。如果我使事件触发器改变了我赢得的半径，是否有可能通过事件触发器添加模糊效果？

提前感谢

Answer 1

我找到了一个解决办法：

<Grid x:Name="Root_Grid"
  VerticalAlignment="Stretch">
<i:Interaction.Triggers>
    <i:EventTrigger EventName="Click"
                    SourceName="Button1">
        <window:SetBlurEffectAction />
    </i:EventTrigger>
    <i:EventTrigger EventName="Click"
                    SourceName="Button2">
        <window:SetBlurEffectAction />
    </i:EventTrigger>
</i:Interaction.Triggers>
<AdornerDecorator ClipToBounds="True"
                  x:Name="PART_WindowAdornerDecorator">
    <ContentPresenter x:Name="PART_RootContentPresenter"
                      ContentTemplate="{TemplateBinding ActualWindowTemplate}"
                      dxr:RibbonControlHelper.IsAutoHide="{TemplateBinding RibbonAutoHideMode}"
                      dxr:RibbonControlHelper.DisplayShowModeSelector="{TemplateBinding DisplayShowModeSelector}" />
</AdornerDecorator>

如您所见，Root_Grid是AdornerDecorator的父级。Button1和Button2是Root_Grid的一些孙辈。

public class SetBlurEffectAction : TriggerAction<DependencyObject> {
    protected override void Invoke(object parameter) {
        var e = parameter as RoutedEventArgs;
        // OriginalSource is one of the buttons
        var parent = e?.OriginalSource as UIElement;
        // get Grid (parent of AdornerDecorator)
        while(true) {
            if(parent == null) {
                return;
            }
            var grid = parent as Grid;
            if("Root_Grid".Equals(grid?.Name)) {
                break;
            }
            parent = VisualTreeHelper.GetParent(parent) as UIElement;
        }
        // apply blur to this AdornerDecorator
        var deco = ((Grid)parent).GetElementByName("PART_WindowAdornerDecorator") as AdornerDecorator;
        if(deco == null) {
            return;
        }
        // != collapsed because the property is not updated yet
        if(StandardWindowEventHandler.LockedOverlayVisibility != Visibility.Collapsed) {
            deco.Effect = null;
        } else {
            deco.Effect = new BlurEffect {
                KernelType = KernelType.Gaussian,
                Radius = 7
            };
        }
    }
}

StandardWindowEventHandler.LockedOverlayVisibility是一个静态属性，当按下其中一个按钮时该属性将被更新。