修改选项卡控件的标头

Question

所以我在运行时直接将我的视图添加到TabControl的项目集合中(而不是在它们周围创建TabItems并将这些TabItems添加到TabControl)。视图暴露了一个名为HasChanges的属性(包装同名的ViewModel属性)，我想绑定到TabItem的头部，以显示一个星号(*)标志来识别未保存更改的选项卡，就像VS一样。我已经尝试过使用DataTemplates，但在DataTemplate中访问视图对象有困难。正确的做法是什么?以下是我的几个尝试之一:

<TabControl.ItemTemplate>
    <DataTemplate DataType="UserControl">
        <StackPanel Orientation="Horizontal" Margin="0" Height="22">
            <TextBlock VerticalAlignment="Center" Text="{Binding HeaderText, RelativeSource={RelativeSource AncestorType=UserControl}}" />
            <TextBlock Text="*" Visibility="{Binding HasChanges, RelativeSource={RelativeSource Mode=TemplatedParent}, Converter={StaticResource B2VConverter}}" />
        </StackPanel>
    </DataTemplate>
</TabControl.ItemTemplate>

请注意，我正在为两个TextBlock s尝试两种不同的绑定方法，其中没有一种工作。我的视图继承自UserControl和暴露属性HasChanges和HeaderText。

Answer 1

OK。我自己解决的。对于任何想要实现类似vs的关闭按钮和未保存的更改星号的人来说，这里是模板:

<TabControl.ItemContainerStyle>
    <Style TargetType="{x:Type TabItem}">
        <Setter Property="HeaderTemplate" >
            <Setter.Value>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal" Margin="0" Height="22">
                        <TextBlock VerticalAlignment="Center" Text="{Binding RelativeSource={RelativeSource AncestorType=TabItem}, Path=Content.HeaderText}" />
                        <TextBlock Text=" *" ToolTip="Has unsaved changes" Visibility="{Binding Content.DataContext.HasChanges, RelativeSource={RelativeSource AncestorType=TabItem}, Converter={StaticResource B2VConverter}}" />
                        <Button Style="{StaticResource {x:Static ToolBar.ButtonStyleKey}}" Width="18" Height="18" 
                                Margin="6,0,0,0" Padding="0" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" HorizontalAlignment="Center" 
                                Command="{Binding DataContext.TabClosingCommand, RelativeSource={RelativeSource AncestorType={x:Type Window}}}"
                                CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=UserControl}}"
                                VerticalAlignment="Center" Focusable="False">
                            <Grid Margin="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
                                <Line StrokeThickness="3" StrokeStartLineCap="Round"  StrokeEndLineCap="Round" Stroke="Gray" X1="1" Y1="1" X2="9" Y2="9" HorizontalAlignment="Center" VerticalAlignment="Center" />
                                <Line StrokeThickness="3" StrokeStartLineCap="Round" StrokeEndLineCap="Round" Stroke="Gray" X1="1" Y1="9" X2="9" Y2="1" HorizontalAlignment="Center" VerticalAlignment="Center" />
                            </Grid>
                        </Button>
                    </StackPanel>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</TabControl.ItemContainerStyle>

生成一个基于图形的按钮，外观是平面的。您的视图必须实现布尔HasChanges和HeaderText属性，另外您需要在您的资源部分定义一个BooleanToVisibilityConverter，命名为B2VConverter。