问题描述
有没有人知道如何在TabItem或TabControl中设置触发器，这些触发器将仅根据TabItem的放置/方向来更改TabItem内部边框的CornerRadius？这是我要修复的图片：
您应该注意两组选项卡，左上一组带有文本“ Cell browser”，而下一组。查看它，可以看到底部TabItem的角半径对于TabItems的旋转是不正确的。当它们应该向下时，它们被倒转了。有谁知道如何根据标签条的位置更改TabItems的拐角半径？我已经知道我可以为每个特定方向创建不同的样式，例如当放置位置为“左”，“底部”等时的样式。但是，我宁愿只使用一种样式。
在下面的xaml中，tabitem声明中有一个边框，简称为“边框”。这就是我希望通过触发器进行更改的方式。我只是不知道如何从tabcontrol样式访问它，或者可以选择从tabitem样式触发器执行相同操作，并以某种方式检测当前方向。
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:VoidwalkerEngine.Editor.Resources.Themes.Styles">
<Style x:Key="VoidwalkerTabControlStyle" targettype="{x:Type TabControl}">
<Setter Property="Padding" Value="2" />
<Setter Property="HorizontalContentAlignment" Value="Center" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="BorderBrush" Value="#3f3f46" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate targettype="{x:Type TabControl}">
<Grid
x:Name="templateRoot"
Background="#181818"
ClipToBounds="true"
KeyboardNavigation.TabNavigation="Local"
SnapsToDevicePixels="true">
<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>
<TabPanel
x:Name="headerPanel"
Grid.Row="0"
Grid.Column="0"
Margin="0"
Panel.ZIndex="1"
Background="Transparent"
IsItemsHost="true"
KeyboardNavigation.TabIndex="1" />
<Border
x:Name="contentPanel"
Grid.Row="1"
Grid.Column="0"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
KeyboardNavigation.DirectionalNavigation="Contained"
KeyboardNavigation.TabIndex="2"
KeyboardNavigation.TabNavigation="Local">
<ContentPresenter
x:Name="PART_SelectedContentHost"
Margin="0"
ContentSource="SelectedContent"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="TabStripPlacement" Value="Bottom">
<Setter TargetName="headerPanel" Property="Grid.Row" Value="1" />
<Setter TargetName="contentPanel" Property="Grid.Row" Value="0" />
<Setter TargetName="RowDeFinition0" Property="Height" Value="*" />
<Setter TargetName="RowDeFinition1" Property="Height" Value="Auto" />
<Setter TargetName="headerPanel" Property="Margin" Value="0" />
</Trigger>
<Trigger Property="TabStripPlacement" Value="Left">
<Setter TargetName="headerPanel" Property="Grid.Row" Value="0" />
<Setter TargetName="contentPanel" Property="Grid.Row" Value="0" />
<Setter TargetName="headerPanel" Property="Grid.Column" Value="0" />
<Setter TargetName="contentPanel" Property="Grid.Column" Value="1" />
<Setter TargetName="ColumnDeFinition0" Property="Width" Value="Auto" />
<Setter TargetName="ColumnDeFinition1" Property="Width" Value="*" />
<Setter TargetName="RowDeFinition0" Property="Height" Value="*" />
<Setter TargetName="RowDeFinition1" Property="Height" Value="0" />
<Setter TargetName="headerPanel" Property="Margin" Value="0" />
<Setter TargetName="headerPanel" Property="VerticalAlignment" Value="Top" />
<Setter TargetName="headerPanel" Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="270" />
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="TabStripPlacement" Value="Right">
<Setter TargetName="headerPanel" Property="Grid.Row" Value="0" />
<Setter TargetName="contentPanel" Property="Grid.Row" Value="0" />
<Setter TargetName="headerPanel" Property="Grid.Column" Value="1" />
<Setter TargetName="contentPanel" Property="Grid.Column" Value="0" />
<Setter TargetName="ColumnDeFinition0" Property="Width" Value="*" />
<Setter TargetName="ColumnDeFinition1" Property="Width" Value="Auto" />
<Setter TargetName="RowDeFinition0" Property="Height" Value="*" />
<Setter TargetName="RowDeFinition1" Property="Height" Value="0" />
<Setter TargetName="headerPanel" Property="Margin" Value="0" />
<Setter TargetName="headerPanel" Property="VerticalAlignment" Value="Top" />
<Setter TargetName="headerPanel" Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="90" />
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter TargetName="templateRoot" Property="TextElement.Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="VoidwalkerTabItemStyle" targettype="{x:Type TabItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate targettype="{x:Type TabItem}">
<Grid x:Name="Root">
<Border
x:Name="Border"
Margin="0"
Background="Yellow"
BorderBrush="Red"
BorderThickness="1,1,0"
CornerRadius="1,0">
<TextBlock
x:Name="ContentSite"
Margin="12,2,12,2"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Text="{TemplateBinding Header}" />
</Border>
</Grid>
<ControlTemplate.Triggers>
<Trigger SourceName="ContentSite" Property="IsMouSEOver" Value="True">
<Setter TargetName="ContentSite" Property="Foreground" Value="{DynamicResource GlobalAccentSolidColorBrush}" />
</Trigger>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Panel.ZIndex" Value="100" />
<Setter TargetName="Border" Property="Background" Value="#444444" />
<Setter TargetName="Border" Property="BorderBrush" Value="#444444" />
<Setter Property="Foreground" Value="#eeeeee" />
</Trigger>
<Trigger Property="IsSelected" Value="False">
<Setter Property="Foreground" Value="#a4a4a4" />
<Setter TargetName="Border" Property="Background" Value="#373737" />
<Setter TargetName="Border" Property="BorderBrush" Value="#2b2b2b" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
解决方法
当TabStripPlacement设置为CornerRadius时，Bottom是错误的。这样做的原因是，在这种情况下标题面板不会旋转，因为那样一来内容将被上下颠倒显示。
您可以将触发器添加到TabItem控件模板中，该模板将根据该模板翻转拐角半径。 TabStripPlacement属性在TabControl和TabItem上均可用。
<Trigger Property="TabStripPlacement" Value="{x:Static Dock.Bottom}">
<Setter TargetName="Border" Property="CornerRadius" Value="0,1,1"/>
</Trigger>
另一种替代方法是将Border旋转180°以使拐角半径正确，然后将其ContentSite旋转180°以使其旋转反向而不是 上下颠倒显示。
<Trigger Property="TabStripPlacement" Value="Bottom">
<Setter TargetName="Border" Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="180"/>
</Setter.Value>
</Setter>
<Setter TargetName="ContentSite" Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="180"/>
</Setter.Value>
</Setter>
</Trigger>
将这两个备用触发器中的任何一个粘贴到TabItem控制模板Triggers部分中。