使用 CornerRadius 在边框内滚动内容

Question

我正在寻求有关 WPF 问题的帮助，我已经解决了一段时间了。我设计了一个选项卡视图，将选项卡移动到左侧并垂直显示它们。这些选项卡位于左上角和左下角带有圆角的边框内。

普通标签 http://gallery.me.com/theplatz/100006/TabGood.png?derivative=medium&source=web.png&type=medium&ver=12464623560001

滚动选项卡时我遇到了问题。内容实际上位于角的顶部，而不是圆角剪切滚动的内容，如下所示：

重叠选项卡 http://gallery.me.com/theplatz/100006/TabBad/web.png?ver=12464623500001

这是 XAML：

<Style x:Key="SidebarTabControl" TargetType="TabControl">
    <Setter Property="Background" Value="#FFC6D3DE" />
    <Setter Property="Padding" Value="0,20,0,0" />
    <Setter Property="TabStripPlacement" Value="Left" />
    <Setter Property="IsSynchronizedWithCurrentItem" Value="True" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type TabControl}">
                <Grid KeyboardNavigation.TabNavigation="Local">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="200" MinWidth="150" MaxWidth="400" />
                        <ColumnDefinition />
                    </Grid.ColumnDefinitions>

                <Border
                    CornerRadius="10,0,0,10"
                    Background="{TemplateBinding Background}">
                    <ScrollViewer Grid.Column="0"
                        VerticalScrollBarVisibility="Auto"
                        HorizontalScrollBarVisibility="Disabled"
                        ClipToBounds="True">
                        <Border Padding="{TemplateBinding Padding}">        
                        <TabPanel
                            IsItemsHost="True"
                            KeyboardNavigation.TabIndex="1"
                            Background="Transparent">
                        </TabPanel>
                        </Border>
                    </ScrollViewer>
                </Border>

                <ContentPresenter
                    Grid.Column="1"
                    Margin="0"
                    ContentSource="SelectedContent" />

                <GridSplitter Grid.Column="0"
                  HorizontalAlignment="Right"
                  VerticalAlignment="Stretch"
                  Background="{StaticResource SplitterBrush}" 
                  ShowsPreview="True"
                  Width="1" />
              </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<Style x:Key="SidebarTab" TargetType="TabItem">
    <Setter Property="Padding" Value="10,12,2,12" />
    <Setter Property="BorderThickness" Value="0,1,0,1" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type TabItem}">
                <Border Padding="{TemplateBinding Padding}" 
                    Name="tab" 
                    BorderThickness="{TemplateBinding BorderThickness}" 
                    BorderBrush="{StaticResource SidebarTabBorderBrush}">
                    <ContentPresenter Style="{StaticResource SidebarTabForegroundStyle}" Name="content" ContentSource="Header" />
                </Border>

                <ControlTemplate.Triggers>
                    <Trigger Property="IsSelected" Value="True">
                        <Setter TargetName="tab" Property="Background" Value="{StaticResource SidebarTabBackgroundBrushSelected}" />
                        <Setter TargetName="tab" Property="BorderBrush" Value="{StaticResource SidebarTabBorderBrushSelected}" />
                        <Setter TargetName="content" Property="Style" Value="{StaticResource SidebarTabForegroundStyleSelected}" />
                    </Trigger>
                    <Trigger Property="IsSelected" Value="False">
                        <Setter TargetName="tab" Property="Background" Value="{StaticResource SidebarTabBackgroundBrush}" />
                        <Setter TargetName="tab" Property="BorderBrush" Value="{StaticResource SidebarTabBorderBrush}" />
                        <Setter TargetName="content" Property="Style" Value="{StaticResource SidebarTabForegroundStyle}" />
                    </Trigger>
                </ControlTemplate.Triggers>

            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

关于我可以实现我正在寻找的目标的方法有什么想法吗？我尝试过一些 ZIndex 技巧，但这似乎不起作用。

Answer 1

为了实现我正在寻找的目标，我使用了找到的解决方案 这里, ，并对其进行修改以满足我的需要。这就是我最终得到的结果：

<Style x:Key="SidebarTabControl" TargetType="TabControl">
    <Setter Property="Background" Value="#FFC6D3DE" />
    <Setter Property="Padding" Value="0,20,0,20" />
    <Setter Property="TabStripPlacement" Value="Left" />
    <Setter Property="IsSynchronizedWithCurrentItem" Value="True" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type TabControl}">
                <Grid KeyboardNavigation.TabNavigation="Local">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="200" MinWidth="150" MaxWidth="400" />
                        <ColumnDefinition />
                    </Grid.ColumnDefinitions>

            <!-- Background of the sidebar and our clipping bounds -->
            <Border Grid.Column="0"
                CornerRadius="10,0,0,10"
                    Background="{TemplateBinding Background}"
                Name="mask" />

            <!-- Border necessary so that the top tab does not get clipped prematurely -->
            <Border Grid.Column="0" Background="Transparent">
                <!-- Add opacity mask to clip contents as they're scrolled -->
                <Border.OpacityMask>
                        <VisualBrush Visual="{Binding ElementName=mask}"/>
                </Border.OpacityMask>
                <ScrollViewer
                VerticalScrollBarVisibility="Visible"
                HorizontalScrollBarVisibility="Disabled">
                <Border Padding="{TemplateBinding Padding}">        
                        <TabPanel
                        IsItemsHost="True"
                        KeyboardNavigation.TabIndex="1"
                        Background="Transparent">
                    </TabPanel>
                </Border>
                 </ScrollViewer>
            </Border>

            <ContentPresenter
                Grid.Column="1"
                        Margin="0"
                        ContentSource="SelectedContent" />

            <GridSplitter Grid.Column="0"
                        HorizontalAlignment="Right"
                        VerticalAlignment="Stretch"
                        Background="{StaticResource SplitterBrush}" 
                        ShowsPreview="True"
                        Width="1" />
              </Grid>
        </ControlTemplate>
    </Setter.Value>
   </Setter>
</Style>

编辑： 我找到了第一个 TabItem 的裁剪问题的解决方案。将 ScrollView 嵌套在第二个边框内并将 OpacityMask 应用于此边框，而不是 ScrollView 解决了问题。此外，我必须显式地将Background="Transparent" 设置为应用OpacityMask 的边框，以免剪辑过早发生。

Answer 2

您可以在圆角的边框设置Clip匹配边框的轮廓的几何形状。

<Border>
    <Border.Clip>
        <RectangleGeometry Rect="..." RadiusX="..." RadiusY="..."/>
    </Border.Clip>
</Border>

请注意 - 因为你可能已经发现了 - 在ClipToBounds Border不会起作用，因为角落和圆形边缘之间的区域的是的在Border的界限，所以不会被限幅。