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我正在尝试使用触发器更改 WPF 选项卡项的标题文本块的前景文本颜色。这适用于大多数（更简单的）场景，但不适用于全局样式的 TextBlocks。

所以这个简单的“鼠标悬停”触发器可以改变前景色：

<Style x:Key="testTabItemStyle1" TargetType="{x:Type TabItem}">
<Setter Property="Foreground" Value="Black"/>
<Setter Property="Background" Value="White"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Stretch"/>
<Setter Property="Template">
   <Setter.Value>
     <ControlTemplate TargetType="{x:Type TabItem}">
       <Grid SnapsToDevicePixels="true">
         <Border x:Name="Bd" Background="White" BorderBrush="Gray" BorderThickness="1,1,1,0">
            <ContentPresenter HorizontalAlignment="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" x:Name="Content" VerticalAlignment="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" ContentSource="Header"/>
         </Border>
       </Grid>
       <ControlTemplate.Triggers>
         <Trigger Property="IsMouseOver" Value="true">
           <Setter Property="Background" TargetName="Bd" Value="Black"/>
           <Setter Property="Foreground" Value="False"/>
         </Trigger>
       </ControlTemplate.Triggers>
     </ControlTemplate>
   </Setter.Value>
</Setter>
</Style>

问题是，当在 App.xaml 中对 TextBlocks 进行全局样式设置时（为了保持一致的外观），前景不会改变，但会保留全局样式的前景色。这就是我的 TextBlocks 的样式：

    <Style TargetType="{x:Type TextBlock}">
        <Setter Property="FontFamily" Value="Arial"/>
        <Setter Property="Foreground" Value="Brown"/>
        <Setter Property="Margin" Value="4,0,4,0"/>
        <Setter Property="TextTrimming" Value="CharacterEllipsis"/>
        <Setter Property="TextWrapping" Value="NoWrap"/>
        <Setter Property="VerticalAlignment" Value="Center"/>
    </Style>

所以我的问题是明确定义的样式分配（在 TabItem 的触发器中）不应该优先吗？更重要的是，如何在不单独为所有文本块分配样式但让 TabItem 文本块按预期更改颜色的情况下解决此问题？

非常感谢

新台币

4

4 回答 4

1

为我工作。只需要改变这个：

<Setter Property="Foreground" Value="False"/>

对此：

<Setter Property="Foreground" Value="White"/>
于 2009-07-15T08:58:21.497 回答
0

您将 TabItem 的前景色设置为红色，而不是 TextBlock。也许 TextBox 样式不是从 TabItem 继承的，因为用户设置的隐式样式优先于触发器设置器。

尝试将绑定添加到 TextBlock 的父 TabItem Foreground 属性。

编辑

像这样

Foreground="{Binding RelativeSource={RelativeSource AncestorType={x:Type TabItem}, AncestorLevel=1}, Path=Foreground}"
于 2009-07-15T09:33:55.357 回答
0

我的意思是这样的：

<TabItem Header="Summary" x:Name="TabSummary" IsSelected="True" Style="{DynamicResource testTabItemStyle1}">
     <Border x:Name="TabSummaryBody" Margin="-5,-5,-5,-5">
             <StackPanel Margin="0,30,0,0" HorizontalAlignment="Center">
                   <TextBlock Text="Please select a document using the tree view on your right to show its properties." 
                              FontSize="16"
                              Foreground="{Binding RelativeSource={RelativeSource AncestorType={x:Type TabItem}, AncestorLevel=1}, Path=Foreground}"/>
             </StackPanel>
     </Border>
</TabItem>

Binding 找到父 TabItem 并绑定到其 Foreground 属性。

于 2009-07-15T10:32:19.543 回答
0

Many thanks for your help, you successfully steered me to the right direction.

My intention was to alter the TabItem's text (Created by WPF's ContentPresenter) as opposed to the TextBlock within the tab which is declared in XAML and can easily change colour.

The problem was with the global style taking precedence. And as the TextBlock is created by WPF rather than declared by me, I could not access it.

The solution was to specify the ContentPresenter Resources, as such:

<ControlTemplate TargetType="{x:Type TabItem}">
 <Grid SnapsToDevicePixels="true">
  <Border x:Name="Bd" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" Padding="{TemplateBinding Padding}">
   <ContentPresenter HorizontalAlignment="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" x:Name="Content" VerticalAlignment="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentSource="Header" RecognizesAccessKey="True">
   <ContentPresenter.Resources>
    <Style TargetType="{x:Type TextBlock}">
         <Setter Property="Foreground" Value="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType={x:Type TabItem}}}"/>
    </Style>
   </ContentPresenter.Resources>
  </ContentPresenter>
  </Border>
 </Grid>

As you can see I have set the TextBlock style within the ContentPresenter resources. So obviously now any TextBlocks within the ContentPresenter shall use the parent's Foreground property and this will take precedence due to value coercion, solving my problem.

Many thanks to all,

NT

于 2009-07-15T10:40:46.110 回答