WPF - 从样式设置器 ControlTemplate 内部访问父控件

发布于 2024-10-07 20:28:51 字数 1065 浏览 4 评论 0原文

当使控件不可修改时，我们将它们显示为 TextBox 以保持一致的样式。问题是 ComboBox 可以包含任何类型的数据，因此绑定 ControlTemplate TextBox 的 Text 属性并不像使用 那样简单>所选项目。

<Style TargetType="{x:Type ComboBox}">
        <Style.Triggers>
            <Trigger Property="IsReadOnly" Value="True">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate>
                            <TextBox Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}, Path=????, Converter={StaticResource ResourceKey=ComboToTextConverter}, UpdateSourceTrigger=PropertyChanged}" />
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Trigger>
        </Style.Triggers>
    </Style>

我的想法是使用 Converter 并发送整个 ComboBox，以便它可以由 Converter 代码处理。有办法做到这一点吗？

欢迎任何其他建议！

原文

When making controls non-amendable we display them as a TextBox to keep a consistent style. The problem is that a ComboBox can have any type of data so binding the Text property of the ControlTemplate TextBox is not as simple as using SelectedItem.

<Style TargetType="{x:Type ComboBox}">
        <Style.Triggers>
            <Trigger Property="IsReadOnly" Value="True">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate>
                            <TextBox Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}, Path=????, Converter={StaticResource ResourceKey=ComboToTextConverter}, UpdateSourceTrigger=PropertyChanged}" />
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Trigger>
        </Style.Triggers>
    </Style>

The idea I have is to use a Converter and send the whole ComboBox so it can be handled by the Converter code. Is there anyway to do this?

Any other suggestions are welcome!

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柠檬色的秋千 2024-10-14 20:28:51

您需要使用 SelectedValue 和 SelectedValuePath 属性：

<Style TargetType="ComboBox" x:Key="cStyle">
<Style.Triggers>
  <Trigger Property="IsReadOnly" Value="True">
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="ComboBox">
          <TextBox Text="{Binding RelativeSource=
                   {RelativeSource TemplatedParent}, 
                   Path=SelectedValue}" />
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Trigger>
</Style.Triggers>

现在，这是您的 ComboBox，

<ComboBox Name="cbox" ItemsSource="{Binding}" 
        Style="{StaticResource cStyle}" 
        SelectedValuePath="SomeText" 
        DisplayMemberPath="SomeText" />

当您在 ComboBox 上将 IsReadOnly 属性设置为 true 时，它会变成 TextBox将选定的值作为其文本。

you need to use the SelectedValue and SelectedValuePath properties:

<Style TargetType="ComboBox" x:Key="cStyle">
<Style.Triggers>
  <Trigger Property="IsReadOnly" Value="True">
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="ComboBox">
          <TextBox Text="{Binding RelativeSource=
                   {RelativeSource TemplatedParent}, 
                   Path=SelectedValue}" />
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Trigger>
</Style.Triggers>

and heres your ComboBox

<ComboBox Name="cbox" ItemsSource="{Binding}" 
        Style="{StaticResource cStyle}" 
        SelectedValuePath="SomeText" 
        DisplayMemberPath="SomeText" />

now when you set the IsReadOnly property to true on the ComboBox, it turns into a TextBox with the selected value as its text.

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