如何为文本框创建<ContentPresenter>类占位符<ControlTemplate>

Question

我正在尝试为文本框设置控件模板并将数据绑定到它。问题是数据没有经过。我想因为我在<ControlTemplate>内有一个文本框标签，所以我需要以某种方式占位符。

<Style x:Key="TextBoxStyle" TargetType="TextBox"> 
    <Setter Property="Template"> 
     <Setter.Value> 
      <ControlTemplate TargetType="TextBox"> 
       <Grid x:Name="grid" Height="55" Background="White"> 
        <Rectangle Stroke="#FFD9D9D9" StrokeThickness="6"/> 
        <ContentPresenter x:Name="contentPresenterText" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="Black"/> 
       </Grid> 
      </ControlTemplate> 
     </Setter.Value> 
    </Setter> 
    </Style> 

所以我尝试通过添加一个<ContentPresenter>标签，但这将引发一个错误。

这里的文本框代码：

<TextBox x:Name="NameTextField" Grid.ColumnSpan="6" Grid.Column="1" TextWrapping="Wrap" Text="{Binding Name, Mode=TwoWay}" Margin="0" Style="{StaticResource TextBoxStyle}" /> 

谁能帮助我了解如何做到这一点。可以应用于数据绑定仍然可用的所有文本字段的通用模板？

更新：这是它指向的时候死机代码：

#if DEBUG && !DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION 
     UnhandledException += (sender, e) => 
     { 
      if (global::System.Diagnostics.Debugger.IsAttached) global::System.Diagnostics.Debugger.Break(); //highlights this 
     }; 
#endif 

Answer 1

首先，它是不是把一个ContentPresenter一个文本框的里面的一个好主意。

如果您使用控件模板，则应使用模板绑定来绑定实际组件属性。下面的代码展示了如何使用它，但据我所知，TextBox没有一个属性喜欢“Content”，所以你可以传递TextBox类的Text，Padding等的值，如图所示。

 <Setter Property="Template"> 
      <Setter.Value> 
       <ControlTemplate TargetType="TextBox"> 
        <Grid x:Name="RootElement"> 
         <!--TextBlock Text="{TemplateBinding Text}"/--> 
         <ContentPresenter Content="{TemplateBinding Padding}"/> 
        </Grid> 
       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 

输出是2,2,2,2 //默认情况下，ContentPresenter在TextBlock中显示它。

除此之外，你可以重写默认的东西，比如TextBox验证。如果你想扩展的东西，我建议覆盖默认样式，你可以通过在混合和编辑模板中右键单击一个文本框来做到这一点 - >编辑一个副本，它通过文本框状态为您生成当前模板，

默认模板是这样的，

<Style x:Key="TextBoxStyle1" TargetType="TextBox"> 
     <Setter Property="BorderThickness" Value="1"/> 
     <Setter Property="Background" Value="#FFFFFFFF"/> 
     <Setter Property="Foreground" Value="#FF000000"/> 
     <Setter Property="Padding" Value="2"/> 
     <Setter Property="BorderBrush"> 
      <Setter.Value> 
       <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> 
        <GradientStop Color="#FFA3AEB9" Offset="0"/> 
        <GradientStop Color="#FF8399A9" Offset="0.375"/> 
        <GradientStop Color="#FF718597" Offset="0.375"/> 
        <GradientStop Color="#FF617584" Offset="1"/> 
       </LinearGradientBrush> 
      </Setter.Value> 
     </Setter> 
     <Setter Property="Template"> 
      <Setter.Value> 
       <ControlTemplate TargetType="TextBox"> 
        <Grid x:Name="RootElement"> 
         <VisualStateManager.VisualStateGroups> 
          <VisualStateGroup x:Name="CommonStates"> 
           <VisualState x:Name="Normal"/> 
           <VisualState x:Name="MouseOver"> 
            <Storyboard> 
             <ColorAnimation Duration="0" To="#FF99C1E2" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="MouseOverBorder"/> 
            </Storyboard> 
           </VisualState> 
           <VisualState x:Name="Disabled"> 
            <Storyboard> 
             <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="DisabledVisualElement"/> 
            </Storyboard> 
           </VisualState> 
           <VisualState x:Name="ReadOnly"> 
            <Storyboard> 
             <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="ReadOnlyVisualElement"/> 
            </Storyboard> 
           </VisualState> 
          </VisualStateGroup> 
          <VisualStateGroup x:Name="FocusStates"> 
           <VisualState x:Name="Focused"> 
            <Storyboard> 
             <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisualElement"/> 
            </Storyboard> 
           </VisualState> 
           <VisualState x:Name="Unfocused"> 
            <Storyboard> 
             <DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisualElement"/> 
            </Storyboard> 
           </VisualState> 
          </VisualStateGroup> 
          <VisualStateGroup x:Name="ValidationStates"> 
           <VisualState x:Name="Valid"/> 
           <VisualState x:Name="InvalidUnfocused"> 
            <Storyboard> 
             <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ValidationErrorElement"> 
              <DiscreteObjectKeyFrame KeyTime="0"> 
               <DiscreteObjectKeyFrame.Value> 
                <Visibility>Visible</Visibility> 
               </DiscreteObjectKeyFrame.Value> 
              </DiscreteObjectKeyFrame> 
             </ObjectAnimationUsingKeyFrames> 
            </Storyboard> 
           </VisualState> 
           <VisualState x:Name="InvalidFocused"> 
            <Storyboard> 
             <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ValidationErrorElement"> 
              <DiscreteObjectKeyFrame KeyTime="0"> 
               <DiscreteObjectKeyFrame.Value> 
                <Visibility>Visible</Visibility> 
               </DiscreteObjectKeyFrame.Value> 
              </DiscreteObjectKeyFrame> 
             </ObjectAnimationUsingKeyFrames> 
             <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IsOpen" Storyboard.TargetName="validationTooltip"> 
              <DiscreteObjectKeyFrame KeyTime="0"> 
               <DiscreteObjectKeyFrame.Value> 
                <System:Boolean>True</System:Boolean> 
               </DiscreteObjectKeyFrame.Value> 
              </DiscreteObjectKeyFrame> 
             </ObjectAnimationUsingKeyFrames> 
            </Storyboard> 
           </VisualState> 
          </VisualStateGroup> 
         </VisualStateManager.VisualStateGroups> 
         <Border x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="1" Opacity="1"> 
          <Grid> 
           <Border x:Name="ReadOnlyVisualElement" Background="#5EC9C9C9" Opacity="0"/> 
           <Border x:Name="MouseOverBorder" BorderBrush="Transparent" BorderThickness="1"> 
            <ScrollViewer x:Name="ContentElement" BorderThickness="0" IsTabStop="False" Padding="{TemplateBinding Padding}"/> 
           </Border> 
          </Grid> 
         </Border> 
         <Border x:Name="DisabledVisualElement" BorderBrush="#A5F7F7F7" BorderThickness="{TemplateBinding BorderThickness}" Background="#A5F7F7F7" IsHitTestVisible="False" Opacity="0"/> 
         <Border x:Name="FocusVisualElement" BorderBrush="#FF6DBDD1" BorderThickness="{TemplateBinding BorderThickness}" IsHitTestVisible="False" Margin="1" Opacity="0"/> 
         <Border x:Name="ValidationErrorElement" BorderBrush="#FFDB000C" BorderThickness="1" CornerRadius="1" Visibility="Collapsed"> 
          <ToolTipService.ToolTip> 
           <ToolTip x:Name="validationTooltip" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}" Placement="Right" PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}" Template="{StaticResource ValidationToolTipTemplate}"> 
            <ToolTip.Triggers> 
             <EventTrigger RoutedEvent="Canvas.Loaded"> 
              <BeginStoryboard> 
               <Storyboard> 
                <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IsHitTestVisible" Storyboard.TargetName="validationTooltip"> 
                 <DiscreteObjectKeyFrame KeyTime="0"> 
                  <DiscreteObjectKeyFrame.Value> 
                   <System:Boolean>true</System:Boolean> 
                  </DiscreteObjectKeyFrame.Value> 
                 </DiscreteObjectKeyFrame> 
                </ObjectAnimationUsingKeyFrames> 
               </Storyboard> 
              </BeginStoryboard> 
             </EventTrigger> 
            </ToolTip.Triggers> 
           </ToolTip> 
          </ToolTipService.ToolTip> 
          <Grid Background="Transparent" HorizontalAlignment="Right" Height="12" Margin="1,-4,-4,0" VerticalAlignment="Top" Width="12"> 
           <Path Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 z" Fill="#FFDC000C" Margin="1,3,0,0"/> 
           <Path Data="M 0,0 L2,0 L 8,6 L8,8" Fill="#ffffff" Margin="1,3,0,0"/> 
          </Grid> 
         </Border> 
        </Grid> 
       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 
    </Style> 

加成取决于您的评论：

 <ControlTemplate x:Key="TextBoxControlTemplate1" TargetType="TextBox"> 
     <Grid x:Name="grid" Background="White"> 
       <Rectangle Stroke="#FFD9D9D9" StrokeThickness="26"/> 
       <ContentPresenter x:Name="contentPresenterText" HorizontalAlignment="Center" VerticalAlignment="Center" > 
        <TextBox Text="{TemplateBinding Text}"/> 
       </ContentPresenter> 
     </Grid> 
    </ControlTemplate>