Question

我有一个带边框的WPF项目，使用以下样式。计划是让鼠标在边界上移动时发光效果淡入，在离开时淡出效果。

<Style x:Key="BorderGlow" TargetType="Border">
    <Style.Resources>
        <Storyboard x:Key="GlowOn">
            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(DropShadowEffect.Opacity)">
                <SplineDoubleKeyFrame KeyTime="0:0:0.3" Value="1"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
        <Storyboard x:Key="GlowOff">
            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(DropShadowEffect.Opacity)">
                <SplineDoubleKeyFrame KeyTime="0:0:0.3" Value="0"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
    </Style.Resources>

    <Setter Property="CornerRadius" Value="6,1,6,1" />
    <Setter Property="BorderBrush" Value="{StaticResource SelectedBorder}" />
    <Setter Property="BorderThickness" Value="1" />
    <Setter Property="Background" Value="{StaticResource DeselectedBackground}" />
    <Setter Property="RenderTransformOrigin" Value="0.5,0.5" />
    <Setter Property="TextBlock.Foreground" Value="{StaticResource SelectedForeground}" />

    <Setter Property="RenderTransform">
        <Setter.Value>
            <RotateTransform Angle="90"/>
        </Setter.Value>
    </Setter>

    <Setter Property="Effect">
        <Setter.Value>
            <DropShadowEffect ShadowDepth="0" BlurRadius="8" Color="#FFB0E9EF"/>
        </Setter.Value>
    </Setter>

    <Style.Triggers>
        <Trigger Property="IsMouseOver" Value="True">

            <Trigger.EnterActions>
                <BeginStoryboard Storyboard="{StaticResource GlowOn}"/>
            </Trigger.EnterActions>

            <Trigger.ExitActions>
                <BeginStoryboard Storyboard="{StaticResource GlowOff}"/>
            </Trigger.ExitActions>

        </Trigger>
    </Style.Triggers>
</Style>

问题是，没有任何反应！如果我在Storyboard TargetProperty中将“DropShadowEffect”更改为“UIElement”，则动画会起作用，但这会使整个控件失效。

如何淡化DropShadowEffect？

Answer 1

需要注意几点

1）您需要定位Border的实际属性 - 您实际上是在尝试定位Effect属性的值（DropShadowEffect），而不是属性本身。

2）您需要对PropertyPath的语法进行排序。

将Storyboard.Target属性更改为以下内容，您应该没问题：

Storyboard.TargetProperty="(Effect).Opacity"

编辑评论中指出的工作代码：

<Border BorderThickness="10" Height="100" Width="100">
    <Border.BorderBrush>
        <SolidColorBrush Color="Red"></SolidColorBrush>
    </Border.BorderBrush>
    <Border.Style>
        <Style TargetType="Border">
            <Style.Resources>
                <Storyboard x:Key="GlowOn">
                    <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" 
                          Storyboard.TargetProperty="(Effect).Opacity">
                        <SplineDoubleKeyFrame KeyTime="0:0:0.3" Value="1"/>
                    </DoubleAnimationUsingKeyFrames>
                </Storyboard>
                <Storyboard x:Key="GlowOff">
                    <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" 
                          Storyboard.TargetProperty="(Effect).Opacity">
                        <SplineDoubleKeyFrame KeyTime="0:0:0.3" Value="0"/>
                    </DoubleAnimationUsingKeyFrames>
                </Storyboard>
            </Style.Resources>

            <Setter Property="CornerRadius" Value="6,1,6,1" />
        <!--<Setter Property="BorderBrush"
                    Value="{StaticResource SelectedBorder}" />-->
            <Setter Property="BorderThickness" Value="1" />
        <!--<Setter Property="Background"
                    Value="{StaticResource DeselectedBackground}" />-->
            <Setter Property="RenderTransformOrigin" Value="0.5,0.5" />
        <!--<Setter Property="TextBlock.Foreground"
                    Value="{StaticResource SelectedForeground}" />-->

            <Setter Property="RenderTransform">
                <Setter.Value>
                    <RotateTransform Angle="90"/>
                </Setter.Value>
            </Setter>

            <Setter Property="Effect">
                <Setter.Value>
                    <DropShadowEffect ShadowDepth="20"
                                      BlurRadius="8"
                                      Color="#FFB0E9EF"/>
                </Setter.Value>
            </Setter>

            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">

                    <Trigger.EnterActions>
                        <BeginStoryboard
                              Storyboard="{StaticResource GlowOn}"/>
                    </Trigger.EnterActions>

                    <Trigger.ExitActions>
                        <BeginStoryboard
                              Storyboard="{StaticResource GlowOff}"/>
                    </Trigger.ExitActions>

                </Trigger>
            </Style.Triggers>

        </Style>
    </Border.Style>
</Border>

Answer 2

这是Simon回答的后续，其中我有一个ListView，其中Template的{{1}}项在ListViewItem上有一个DropShadow。长话短说，因为要覆盖Grid，所以所选项目和悬停不再起作用。为了使这些工作，我不得不修改ListViewItem，并且有两种方法可以访问Opacity，具体取决于其中一个。我在下面显示的...这是两个摘录的完整示例：

选择时设置

Effect

设置为<ListView.ItemContainerStyle> <Style TargetType="ListViewItem"> <Style.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Cursor" Value="Hand"/> </Trigger> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property="IsSelected" Value="true" /> <Condition Property="Selector.IsSelectionActive" Value="true" /> </MultiTrigger.Conditions> <Setter Property="FontWeight" Value="Bold" /> <Setter Property="Effect"> <Setter.Value> <DropShadowEffect Opacity="1"/> </Setter.Value> </Setter> </MultiTrigger> </Style.Triggers>

Grid.Triggers

如何设置DropShadowEffect的不透明度？

2 个答案: