WPF TabControl - 当TabItem可见性更改时选择不同的选项卡

Question

我有一个TabControl在UserControl一个视图模型的支持,以及Visibility标签项目之一,必将对视图模型的属性.

<TabControl x:Name="myTabControl">
    <TabItem Header="Tab 1" />
    <TabItem Header="Tab 2" Visibility="{Binding HasData, Converter={StaticResource boolToVisibilityConverter}}"/>
</TabControl>

当Visibility的TabItem变化,它缩短(隐藏)的TabItem报头,但是它继续显示其内容.

我想TabControl,以切换到可视选项卡时,其他选项卡是隐藏的,并且有点惊讶地发现,它不会自动发生.

将事件处理程序附加到节目的SelectionChanged事件上TabControl,TabItem.IsSelected(和TabControl.SelectedItem)在TabItem.Visibility更改时甚至不受影响(这是一个错误吗？!).

我试过了两个属性触发器:

    <!-- This doesn't compile because of TargetName on the Setter, think you can only use it in Control Templates.
         I don't know how to refer to the parent TabControl from within the TabItem style. -->
    <TabControl.ItemContainerStyle>
        <Style TargetType="{x:Type TabItem}" BasedOn="{StaticResource {x:Type TabItem}}">
            <Style.Triggers>
                <Trigger Property="Visibility" Value="Collapsed">
                    <Setter TargetName="myTabControl" Property="SelectedIndex" Value="0" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </TabControl.ItemContainerStyle>

和数据触发器:

    <!-- This doesn't quite work, it affects the Visibility of the TabItem's content too -->
    <TabControl.Style>
        <Style TargetType="{x:Type TabControl}" BasedOn="{StaticResource {x:Type TabControl}}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=SelectedItem.Visibility, ElementName=tabControl}" 
                             Value="Collapsed">
                    <Setter Property="SelectedIndex" Value="0" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TabControl.Style>

我无法让触发器工作,并且VisibilityChanged我无法处理任何事件,所以我有点卡住并会感激一些帮助.

Answer 1

TabItem 类有一个可以使用的 IsVisibleChanged 事件。