WPF垂直TabItem边框问题

Question

我刚刚开始使用 WPF，在左侧显示 TabControl 并将 TabItem 文本标题旋转 90 度后，我遇到了视觉问题。

问题是 TabItem 标头的顶部边框未显示。 代码是这样的：

<Window x:Class="WPF_Exemplo1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="675" Width="900" ResizeMode="NoResize" WindowStyle="None" WindowState="Maximized">
    <Grid>
        <TabControl Margin="12,85.74,98.601,167.193" Name="tabControl1" TabStripPlacement="Left">
            <TabItem Name="tabItem1" FlowDirection="LeftToRight" FontSize="22" Height="60">
                <TabItem.Header>
                    <StackPanel Orientation="Horizontal">
                        <Image Height="40" Width="40" Margin="20,0,0,0" VerticalAlignment="Center"></Image>
                        <TextBlock Margin="25,0,25,0" VerticalAlignment="Center">Item 1</TextBlock>
                    </StackPanel>
                </TabItem.Header>
                <TabItem.LayoutTransform>
                    <TransformGroup>
                        <RotateTransform Angle="-90"/>
                    </TransformGroup>
                </TabItem.LayoutTransform>
                <Grid />
            </TabItem>
        </TabControl>
    </Grid>
</Window>

Answer 1

默认情况下，选项卡项目在选择时会隐藏其右边框。 这会创建一个与选项卡内容混合的视觉外观。 但是，由于您将选项卡项目旋转了 90 度，因此它不再用于此目的。 为了获得正确的视觉反应，您需要编辑 TabItem 的 ControlTemplate。 最简单的方法是从模板的副本开始（如果您有 Blend，则只需转到“编辑模板副本”）。 如果您没有 Blend，那么您可以使用我的 Blend 版本（如下）创建的默认资源。 然后编辑正确的边框属性以创建您想要的视觉效果。

<Window.Resources>
    <Style x:Key="TabItemFocusVisual">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Rectangle SnapsToDevicePixels="true" Margin="3,3,3,1" Stroke="Black" StrokeDashArray="1 2" StrokeThickness="1"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <SolidColorBrush x:Key="TabControlNormalBorderBrush" Color="#8C8E94"/>
    <LinearGradientBrush x:Key="ButtonNormalBackground" EndPoint="0,1" StartPoint="0,0">
        <GradientStop Color="#F3F3F3" Offset="0"/>
        <GradientStop Color="#EBEBEB" Offset="0.5"/>
        <GradientStop Color="#DDDDDD" Offset="0.5"/>
        <GradientStop Color="#CDCDCD" Offset="1"/>
    </LinearGradientBrush>
    <LinearGradientBrush x:Key="TabItemHotBackground" EndPoint="0,1" StartPoint="0,0">
        <GradientStop Color="#EAF6FD" Offset="0.15"/>
        <GradientStop Color="#D9F0FC" Offset=".5"/>
        <GradientStop Color="#BEE6FD" Offset=".5"/>
        <GradientStop Color="#A7D9F5" Offset="1"/>
    </LinearGradientBrush>
    <SolidColorBrush x:Key="TabItemSelectedBackground" Color="#F9F9F9"/>
    <SolidColorBrush x:Key="TabItemHotBorderBrush" Color="#3C7FB1"/>
    <SolidColorBrush x:Key="TabItemDisabledBackground" Color="#F4F4F4"/>
    <SolidColorBrush x:Key="TabItemDisabledBorderBrush" Color="#FFC9C7BA"/>
    <Style x:Key="TabItemStyle1" TargetType="{x:Type TabItem}">
        <Setter Property="FocusVisualStyle" Value="{StaticResource TabItemFocusVisual}"/>
        <Setter Property="Foreground" Value="Black"/>
        <Setter Property="Padding" Value="6,1,6,1"/>
        <Setter Property="BorderBrush" Value="{StaticResource TabControlNormalBorderBrush}"/>
        <Setter Property="Background" Value="{StaticResource ButtonNormalBackground}"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="Stretch"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TabItem}">
                    <Grid SnapsToDevicePixels="true">
                        <Border x:Name="Bd" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" Padding="{TemplateBinding Padding}">
                            <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" HorizontalAlignment="{Binding Path=HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" x:Name="Content" VerticalAlignment="{Binding Path=VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" ContentSource="Header" RecognizesAccessKey="True"/>
                        </Border>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter Property="Background" TargetName="Bd" Value="{StaticResource TabItemHotBackground}"/>
                        </Trigger>
                        <Trigger Property="IsSelected" Value="true">
                            <Setter Property="Panel.ZIndex" Value="1"/>
                            <Setter Property="Background" TargetName="Bd" Value="{StaticResource TabItemSelectedBackground}"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="false"/>
                                <Condition Property="IsMouseOver" Value="true"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="BorderBrush" TargetName="Bd" Value="{StaticResource TabItemHotBorderBrush}"/>
                        </MultiTrigger>
                        <Trigger Property="TabStripPlacement" Value="Bottom">
                            <Setter Property="BorderThickness" TargetName="Bd" Value="1,0,1,1"/>
                        </Trigger>
                        <Trigger Property="TabStripPlacement" Value="Left">
                            <Setter Property="BorderThickness" TargetName="Bd" Value="1,1,0,1"/>
                        </Trigger>
                        <Trigger Property="TabStripPlacement" Value="Right">
                            <Setter Property="BorderThickness" TargetName="Bd" Value="0,1,1,1"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="true"/>
                                <Condition Property="TabStripPlacement" Value="Top"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Margin" Value="-2,-2,-2,-1"/>
                            <Setter Property="Margin" TargetName="Content" Value="0,0,0,1"/>
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="true"/>
                                <Condition Property="TabStripPlacement" Value="Bottom"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Margin" Value="-2,-1,-2,-2"/>
                            <Setter Property="Margin" TargetName="Content" Value="0,1,0,0"/>
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="true"/>
                                <Condition Property="TabStripPlacement" Value="Left"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Margin" Value="-2,-2,-1,-2"/>
                            <Setter Property="Margin" TargetName="Content" Value="0,0,1,0"/>
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="true"/>
                                <Condition Property="TabStripPlacement" Value="Right"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Margin" Value="-1,-2,-2,-2"/>
                            <Setter Property="Margin" TargetName="Content" Value="1,0,0,0"/>
                        </MultiTrigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Background" TargetName="Bd" Value="{StaticResource TabItemDisabledBackground}"/>
                            <Setter Property="BorderBrush" TargetName="Bd" Value="{StaticResource TabItemDisabledBorderBrush}"/>
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>