组合框项目模板和前景

发布于 2024-12-04 21:10:54 字数 972 浏览 1 评论 0原文

我有一个组合框，它绑定到我的视图模型中的字符串列表。我想做的是，如果我的 viewModel 中的属性为 true，则将组合框项的前景设置为不同的颜色：

<ComboBox x:Name="myComboBox" ItemsSource="{Binding Names}">
  <ComboBox.ItemTemplate>
    <DataTemplate>
      <TextBlock Text="{Binding ...}">
        <TextBlock.Style>
          <Style TargetType="{x:Type TextBlock}">
            <Style.Triggers>
              <DataTrigger Binding="{Binding IsActive}" Value="True">
                <Setter Property="Foreground" Value="Navy"/>
              </DataTrigger>
            </Style.Triggers>
          </Style>
        </TextBlock.Style>
      </TextBlock>
    </DataTemplate>
  </ComboBox.ItemTemplate>
</ComboBox>

我不确定将 TextBlock 的文本绑定到什么。我想要的只是显示字符串列表。我总是最终得到一个包含项目的下拉菜单，但它们不可见。我尝试删除风格触发器，认为也许我搞砸了，但这没有帮助。

我采取的方法正确吗？在搜索 IsActive 时，ComboBox.ItemTemplate 是否会正确查看我的 viewModel（即数据上下文），或者该绑定是否也不正确？

原文

I have a comboBox that is bound to a list of strings from my viewModel. What I am trying to do is have the foreground of a comboBox item be set to a different color if a property in my viewModel is true:

<ComboBox x:Name="myComboBox" ItemsSource="{Binding Names}">
  <ComboBox.ItemTemplate>
    <DataTemplate>
      <TextBlock Text="{Binding ...}">
        <TextBlock.Style>
          <Style TargetType="{x:Type TextBlock}">
            <Style.Triggers>
              <DataTrigger Binding="{Binding IsActive}" Value="True">
                <Setter Property="Foreground" Value="Navy"/>
              </DataTrigger>
            </Style.Triggers>
          </Style>
        </TextBlock.Style>
      </TextBlock>
    </DataTemplate>
  </ComboBox.ItemTemplate>
</ComboBox>

I am not sure what to bind the Text of the TextBlock to. All I want is to display the list of strings. I always end up with a dropdown that has the items but they are not visible. I tried removing the style trigger thinking that maybe I was screwing up there, but that didn't help.

Am I taking the right approach? Will the ComboBox.ItemTemplate correctly look at my viewModel (which is the data context) when searching for IsActive or is that binding incorrect as well?

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少女净妖师 2024-12-11 21:10:54

每个 ComboBoxItem 的 DataContext 都是一个字符串，因此

对于 TextBlock，请像 Text 一样绑定到 DataContext ="{Binding}

为了使 DataTrigger 能够找到 IsActive，请在绑定中使用 RelativeSource


    
        <数据模板>

The DataContext for each ComboBoxItem is a string so

For the TextBlock, bind to the DataContext like Text="{Binding}

For the DataTrigger to be able to find IsActive, use RelativeSource in the binding

<ComboBox x:Name="myComboBox" ItemsSource="{Binding Names}">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding}">
                <TextBlock.Style>
                    <Style TargetType="{x:Type TextBlock}">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type ComboBox}},
                                                           Path=DataContext.IsActive}"
                                         Value="True">
                                <Setter Property="Foreground" Value="Navy"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </TextBlock.Style>
            </TextBlock>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

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