Question

我有一个带有关闭按钮（用X表示）的自定义TabItem，因此可以轻松关闭。在此选项卡中，我想放置一个图像或边框项，它以左上角的关闭按钮为中心

此控件模板是

 <ControlTemplate TargetType="{x:Type local:CloseableTabItem}">
      <Grid SnapsToDevicePixels="true">
        <Border x:Name="Bd" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" >
          <DockPanel x:Name="ContentPanel">
            <Button x:Name="PART_Close" Panel.ZIndex="1" HorizontalAlignment="Right" Margin="0,1,1,0" VerticalAlignment="Top" Width="16" Height="16" DockPanel.Dock="Right" Style="{DynamicResource CloseableTabItemButtonStyle}" ToolTip="Close Tab">
              <Path x:Name="Path" Stretch="Fill" StrokeThickness="0.5" Stroke="#FF333333" Fill="#FF969696" Data="F1 M 2.28484e-007,1.33331L 1.33333,0L 4.00001,2.66669L 6.66667,6.10352e-005L 8,1.33331L 5.33334,4L 8,6.66669L 6.66667,8L 4,5.33331L 1.33333,8L 1.086e-007,6.66669L 2.66667,4L 2.28484e-007,1.33331 Z " HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
            </Button>
            <ContentPresenter Panel.ZIndex="0" x:Name="Content" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentSource="Header" RecognizesAccessKey="True" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="{TemplateBinding Padding}"/>
          </DockPanel>
        </Border>
      </Grid>

（控制触发器已被删除）要将Border / Image插入该选项卡标题，请使用以下

<TabControl Margin="0" TabStripPlacement="Left">
        <local:CloseableTabItem>
            <local:CloseableTabItem.Header>
                <Border Height="50" Width="50" Background="Red" BorderThickness="1" BorderBrush="Black" Margin="5" />
            </local:CloseableTabItem.Header>    
        </local:CloseableTabItem>
  </TabControl>

使用此我得到以下结果：

alt text http://lloydsparkes.co.uk/files/CloseTab.png

看起来Button正在限制Border元素的宽度，因此它没有达到我设置的全宽（设置为50x50，因此应该是正方形）。我试图把它们放到不同的Z级别，但它似乎没有像我预期的那样工作。

所以问题是，如何让按钮覆盖边框控件，而按钮不会影响边框控件的大小？

Answer 1

这种行为是因为DockPanel在这里：

<DockPanel x:Name="ContentPanel">
        <Button x:Name="PART_Close" Panel.ZIndex="1" HorizontalAlignment="Right" Margin="0,1,1,0" VerticalAlignment="Top" Width="16" Height="16" DockPanel.Dock="Right" Style="{DynamicResource CloseableTabItemButtonStyle}" ToolTip="Close Tab">
          <Path x:Name="Path" Stretch="Fill" StrokeThickness="0.5" Stroke="#FF333333" Fill="#FF969696" Data="F1 M 2.28484e-007,1.33331L 1.33333,0L 4.00001,2.66669L 6.66667,6.10352e-005L 8,1.33331L 5.33334,4L 8,6.66669L 6.66667,8L 4,5.33331L 1.33333,8L 1.086e-007,6.66669L 2.66667,4L 2.28484e-007,1.33331 Z " HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
        </Button>
        <ContentPresenter Panel.ZIndex="0" x:Name="Content" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" ContentSource="Header" RecognizesAccessKey="True" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="{TemplateBinding Padding}"/>
      </DockPanel>

移除停靠面板并根据需要调整属性，问题将得到解决。

WPF用按钮覆盖图像

1 个答案: