用于子控件的WPF鼠标悬停触发效果

Question

可以说我有这段代码:

<Window>
    <Window.Resources>
        <Color x:Key="MyColor"
               A="255"
               R="152"
               G="152"
               B="152" />
        <DropShadowEffect x:Key="MyEffect" 
                          ShadowDepth="0"
                          Color="{StaticResource MyColor}"
                          BlurRadius="10" />
        <Style x:Key="MyGridStyle"
               TargetType="{x:Type Grid}">
            <Setter Property="Height"
                    Value="200" />
            <Setter Property="Width"
                    Value="200" />
            <Style.Resources>
                <Style TargetType="{x:Type TextBlock}">
                    <Setter Property="Width"
                            Value="100" />
                </Style>
                <Style TargetType="{x:Type Image}">
                    <Setter Property="Height"
                            Value="100" />
                    <Setter Property="Width"
                            Value="100" />
                </Style>
            </Style.Resources>
            <Style.Triggers>
                <Trigger Property="IsMouseOver"
                         Value="true">
                    <!-- How do I apply my effect when this grid is hovered over to Image and TextBox, but not the grid itself? -->
                </Trigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid Style="{StaticResource MyGridStyle}">
        <Grid.RowDefinitions>
            <RowDefinition />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <Image Grid.Row="0"
               Grid.Column="0"
               Source="image.png" />
        <TextBlock Grid.Row="0"
                   Grid.Column="0"
                   Text="Hover Over Me" />
    </Grid>
</Window>

基本上我有一个应用于网格的样式,表示其中的任何TextBlock或Image应该是一定大小的样式.

我想在网格上创建一个Trigger,它会将效果应用于网格中的所有TextBlocks和Images,但不会应用于Grid本身.

我可以将Trigger直接应用于TextBlock和/或Image,但效果仅分别在每个元素上发生.我需要对Grid中的任何TextBlock和/或Image产生影响,尽管我在哪个内部子元素上空盘旋.

谁能帮我这个？

Answer 1

你可以反过来做.也就是说,添加DataTriggers到Image和TextBlock并使其触发IsMouseOver为始祖Grid.

注意:如果您希望在鼠标结束后立即触发此效果,Grid则需要设置Background为值,例如Transparent.默认情况下,在命中测试中不使用Backgroundis null和this值.

<Style x:Key="MyGridStyle" TargetType="{x:Type Grid}">
    <!--<Setter Property="Background" Value="Transparent"/>-->
    <Setter Property="Height" Value="200" />
    <Setter Property="Width" Value="200" />
    <Style.Resources>
        <Style TargetType="{x:Type TextBlock}">
            <Setter Property="Width" Value="200" />
            <Style.Triggers>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType=Grid},
                                               Path=IsMouseOver}" Value="True">
                    <Setter Property="Effect" Value="{StaticResource MyEffect}"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
        <Style TargetType="{x:Type Image}">
            <Setter Property="Height" Value="200" />
            <Setter Property="Width" Value="200" />
            <Style.Triggers>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType=Grid},
                                               Path=IsMouseOver}" Value="True">
                    <Setter Property="Effect" Value="{StaticResource MyEffect}"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Style.Resources>
</Style>