C# 如何在接收焦点时使自定义控件的值可编辑

我创建了一个自定义WPF控件，它显示

Weight

属性的值，该属性为int。当用户单击自定义控件或控件获得焦点时，用户应该能够编辑Weight属性的值

为此，我尝试了以下方法：

• 如果控件处于“非活动”状态，将显示权重属性 在文本块中
• 如果控件获得焦点，则权重属性 将显示在文本框中

  <ResourceDictionary
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:local="clr-namespace:WpfCustomControlLibrary1">
  
  <Style TargetType="{x:Type local:CustomControl1}">
      <Style.Resources>
          <ControlTemplate x:Key="Control_Focused" >
              <Border Background="Green"
                          BorderBrush="Black"
                           CornerRadius="50" Width="40" Height="40">
                  <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
                     <TextBox Width="35"
                                  Text="{Binding Mode=TwoWay,Path=Model.Weight,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type local:CustomControl1}}
                                  ,Converter={x:Static local:CustomControl1.IntToStringConverter}}" />
  
                  </StackPanel>
              </Border>
          </ControlTemplate>
  
          <ControlTemplate x:Key="Control">
              <Border Background="Green"
                          BorderBrush="Black"
                         CornerRadius="50" Width="40" Height="40">
                  <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
                      <TextBlock x:Name="PART_TextBlockWeighted" Text="{Binding Mode=TwoWay,Path=Model.Weight,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type local:CustomControl1}}}" 
                                 HorizontalAlignment="Center" VerticalAlignment="Center" />
                  </StackPanel>
              </Border>
          </ControlTemplate>
  
  
      </Style.Resources>
      <Style.Triggers>
          <Trigger Property="IsFocused" Value="True">
              <Setter Property="Template" Value="{StaticResource Control_Focused}" ></Setter>
          </Trigger>
          <Trigger Property="IsFocused" Value="False">
              <Setter Property="Template" Value="{StaticResource Control}" ></Setter>
          </Trigger>
      </Style.Triggers>
  
  </Style>
  

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此自定义控件样式的问题在于，当用户单击文本框时，触发器将控件模板更改为TextBlock。如何解决此问题？

请尝试改用

IsKeyboardFocusWithin

属性。我相信这会满足你的需要

<Style.Triggers>
    <Trigger Property="IsKeyboardFocusWithin" Value="True">
        <Setter Property="Template" Value="{StaticResource Control_Focused}" ></Setter>
    </Trigger>
    <Trigger Property="IsKeyboardFocusWithin" Value="False">
        <Setter Property="Template" Value="{StaticResource Control}" ></Setter>
    </Trigger>
</Style.Triggers>

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为什么不只使用一个文本框，将不可编辑设置为

IsReadOnly=“True”

，如果需要，还可以为其提供不同的样式。