更改ISMouseOver上的组合框边框按钮

Question

内部控件模板。触发器:

    <ControlTemplate.Triggers>
        <Trigger Property="UIElement.IsMouseOver" Value="True">
            <Setter Property="Panel.Background" TargetName="ButtonBorder" Value="Transparent"/>
            <Setter Property="Shape.Fill" TargetName="Arrow" Value="Gray"/>
        </Trigger>
        <Trigger Property="UIElement.IsMouseOver" Value="false">
            <Setter Property="Panel.Background" TargetName="ButtonBorder" Value="Transparent"/>
            <Setter Property="Shape.Fill" TargetName="Arrow" Value="Gainsboro"/>
        </Trigger>
        <Trigger Property="ToggleButton.IsChecked" Value="True">
            <Setter Property="Panel.Background" TargetName="ButtonBorder" Value="WhiteSmoke"/>
            <Setter Property="Shape.Fill" TargetName="Arrow" Value="#FF8D979E"/>
        </Trigger>
        <Trigger Property="UIElement.IsEnabled" Value="False">
            <Setter Property="Panel.Background" TargetName="Border" Value="{StaticResource ComboBoxDisabledBackgroundBrush}"/>
            <Setter Property="Panel.Background" TargetName="ButtonBorder" Value="{StaticResource ComboBoxDisabledBackgroundBrush}"/>
            <Setter Property="Border.BorderBrush" TargetName="ButtonBorder" Value="{StaticResource ComboBoxDisabledBorderBrush}"/>
            <Setter Property="TextElement.Foreground" Value="{StaticResource ComboBoxDisabledForegroundBrush}"/>
            <Setter Property="Shape.Fill" TargetName="Arrow" Value="#999"/>
        </Trigger>
    </ControlTemplate.Triggers>

在前2个触发器中，我尝试更改UIElement.IsMouseOver上的ComboBox边界，因此我尝试设置<Setter Property="BorderBrush" TargetName="Arrow" Value="Gray"/>，但似乎无法识别BorderBrush。

Answer 1

假设您的ControlTemplate是这样的:

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition />
        <ColumnDefinition Width="20" />
    </Grid.ColumnDefinitions>
    <Border Grid.ColumnSpan="2" Name="Border" ... />
    <Border Grid.Column="1" Name="ButtonBorder" ... />
    <Path Name="Arrow" Grid.Column="1" ... />
</Grid>

那么为了改变边框颜色，必须改变<Border Name="Border" ... >的BorderBrush属性。因此，您应该这样设置触发器:

<ControlTemplate.Triggers>
    <Trigger Property="UIElement.IsMouseOver" Value="True">
        <Setter Property="BorderBrush" TargetName="Border" Value="Red"/>
        <Setter Property="Shape.Fill" TargetName="Arrow" Value="Gainsboro"/>
    </Trigger>
    <Trigger Property="UIElement.IsMouseOver" Value="false">
        <Setter Property="BorderBrush" TargetName="Border" Value="Blue"/>
        <Setter Property="Shape.Fill" TargetName="Arrow" Value="Gray"/>
    </Trigger>