带有单行 TabPanel 和溢出面板的 TabControl

Question

我想将 WPF TabControl 的功能更改为仅生成一行，并为每个其他项目创建一个溢出弹出窗口（如 ToolBar / ToolBarOverflowPanel）。目前在 VisualStudio 中显示选项卡的方式相同。

这是我得到的：

<Style TargetType="TabControl">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="TabControl">
                <Grid KeyboardNavigation.TabNavigation="Local">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="*" />
                    </Grid.RowDefinitions>
                    <controls:OneLineTabPanel x:Name="HeaderPanel"
                                              Grid.Row="0"
                                              Panel.ZIndex="1"
                                              Margin="0"
                                              KeyboardNavigation.TabIndex="1"
                                              Background="Transparent">
                    </controls:OneLineTabPanel>
                 ......

我现在尝试更改 TabPanel（用于显示 headers），但我无法更改其模板（因为它派生自 TabPanel）。所以我尝试从其他控件派生，但是我根本看不到任何项目。

如何让我自己的 ItemsControl 与 TabControl 一起工作？

Answer 1

您需要覆盖整个 TabControl 模板。
幸运的是，使用 Visual Studio 很容易提取模板副本（在文档大纲 window 中右键单击 TabControl 元素 -> 编辑模板 -> 编辑副本）。

在默认的 TabControl 模板中，HeaderPanel 定义如下：

<TabPanel x:Name="HeaderPanel" Grid.Column="0" IsItemsHost="true" Margin="2,2,2,0" Grid.Row="0" KeyboardNavigation.TabIndex="1" Panel.ZIndex="1"/>

主要思想是通过设置 IsItemsHost="true" 不将 TabControl.Items 绑定到 Panel 控件，而是绑定到完全另一种控件类型。例如，要绑定到具有开箱即用的溢出按钮功能的工具栏：

<ToolBar x:Name="HeaderPanel" ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Items}"/>

这里是带有工具栏作为 header 面板的 TabControl 模板的完整示例：

<TabControl>
    <TabControl.Template>
        <ControlTemplate TargetType="{x:Type TabControl}">
            <Grid ClipToBounds="true" SnapsToDevicePixels="true" KeyboardNavigation.TabNavigation="Local">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition x:Name="ColumnDefinition0"/>
                    <ColumnDefinition x:Name="ColumnDefinition1" Width="0"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition x:Name="RowDefinition0" Height="Auto"/>
                    <RowDefinition x:Name="RowDefinition1" Height="*"/>
                </Grid.RowDefinitions>

                <!--this will do the trick!!!-->
                <ToolBar x:Name="HeaderPanel" ItemsSource="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Items}"/>

                <Border x:Name="ContentPanel" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.Column="0" KeyboardNavigation.DirectionalNavigation="Contained" Grid.Row="1" KeyboardNavigation.TabIndex="2" KeyboardNavigation.TabNavigation="Local">
                    <ContentPresenter x:Name="PART_SelectedContentHost" ContentSource="SelectedContent" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                </Border>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="TabStripPlacement" Value="Bottom">
                    <Setter Property="Grid.Row" TargetName="HeaderPanel" Value="1"/>
                    <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0"/>
                    <Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
                    <Setter Property="Height" TargetName="RowDefinition1" Value="Auto"/>
                    <Setter Property="Margin" TargetName="HeaderPanel" Value="2,0,2,2"/>
                </Trigger>
                <Trigger Property="TabStripPlacement" Value="Left">
                    <Setter Property="Grid.Row" TargetName="HeaderPanel" Value="0"/>
                    <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0"/>
                    <Setter Property="Grid.Column" TargetName="HeaderPanel" Value="0"/>
                    <Setter Property="Grid.Column" TargetName="ContentPanel" Value="1"/>
                    <Setter Property="Width" TargetName="ColumnDefinition0" Value="Auto"/>
                    <Setter Property="Width" TargetName="ColumnDefinition1" Value="*"/>
                    <Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
                    <Setter Property="Height" TargetName="RowDefinition1" Value="0"/>
                    <Setter Property="Margin" TargetName="HeaderPanel" Value="2,2,0,2"/>
                </Trigger>
                <Trigger Property="TabStripPlacement" Value="Right">
                    <Setter Property="Grid.Row" TargetName="HeaderPanel" Value="0"/>
                    <Setter Property="Grid.Row" TargetName="ContentPanel" Value="0"/>
                    <Setter Property="Grid.Column" TargetName="HeaderPanel" Value="1"/>
                    <Setter Property="Grid.Column" TargetName="ContentPanel" Value="0"/>
                    <Setter Property="Width" TargetName="ColumnDefinition0" Value="*"/>
                    <Setter Property="Width" TargetName="ColumnDefinition1" Value="Auto"/>
                    <Setter Property="Height" TargetName="RowDefinition0" Value="*"/>
                    <Setter Property="Height" TargetName="RowDefinition1" Value="0"/>
                    <Setter Property="Margin" TargetName="HeaderPanel" Value="0,2,2,2"/>
                </Trigger>
                <Trigger Property="IsEnabled" Value="false">
                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </TabControl.Template>
</TabControl>

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