我正在开发一个 WPF 用户控件，该控件本质上是一个经过改进的 Expander 控件。为了让控件在Windows Classic或Aero主题上运行时看起来相同，我设法设置了一个几乎模仿Aero上/下箭头的控件模板。
“向下”箭头看起来与它应该的完全一样。但是“向上”箭头被 [似乎是] 2 个像素切掉了，这使它看起来有点圆润，我想解决这个问题：
这是完整的<Path>标记：
<Path x:Name="arrow"
Margin="0,5,0,0"
Stroke="SteelBlue"
Data="M 0 5 L 5 0 L 10 5"
StrokeThickness="2"
Height="10" Width="10" />
我想知道要更改什么才能取回我的两个像素-我尝试调整边距和高度，但没有运气。我敢肯定，这只是缺少一点点调整，只是无法弄清楚到底是什么以及在哪里。任何人？
我还需要弄清楚为什么顶部边框看起来弯曲......但这超出了这个问题的范围！
编辑- 这里有足够的标记来重现风格；将样式NormalExpander应用于Expander控件，您应该看到我所看到的...
<Style x:Key="ExpanderDownHeaderStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border Padding="{TemplateBinding Padding}">
<Grid SnapsToDevicePixels="False" Height="25">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="40"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Ellipse x:Name="circle" HorizontalAlignment="Center" Height="19" Stroke="SteelBlue" VerticalAlignment="Center" Width="19"/>
<Path x:Name="arrow" Margin="0,5,0,0" Stroke="SteelBlue" Data="M 0 5 L 5 0 L 10 5" StrokeThickness="2" Height="10" Width="10" />
<!-- down arrow: M 0 0 L 5 5 L 10 0 -->
<ContentPresenter Grid.Column="1" HorizontalAlignment="Left" RecognizesAccessKey="True" SnapsToDevicePixels="True" VerticalAlignment="Center"/>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="Stroke" TargetName="circle" Value="#FF3C7FB1"/>
<Setter Property="Stroke" TargetName="arrow" Value="#222"/>
</Trigger>
<Trigger Property="IsPressed" Value="true">
<Setter Property="Stroke" TargetName="circle" Value="#FF526C7B"/>
<Setter Property="StrokeThickness" TargetName="circle" Value="1.5"/>
<Setter Property="Stroke" TargetName="arrow" Value="DarkBlue"/>
</Trigger>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Data" TargetName="arrow" Value="M 0 5 L 5 0 L 10 5" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="NormalExpander" TargetType="Expander">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Expander}">
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="3" SnapsToDevicePixels="true">
<DockPanel>
<ToggleButton x:Name="HeaderSite" ContentTemplate="{TemplateBinding HeaderTemplate}" ContentTemplateSelector="{TemplateBinding HeaderTemplateSelector}" Content="{TemplateBinding Header}" DockPanel.Dock="Top" Foreground="{TemplateBinding Foreground}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" MinWidth="0" MinHeight="0" Padding="{TemplateBinding Padding}" Style="{StaticResource ExpanderDownHeaderStyle}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
<ContentPresenter x:Name="ExpandSite" DockPanel.Dock="Bottom" Focusable="false" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" Visibility="Collapsed" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</DockPanel>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="true">
<Setter Property="Visibility" TargetName="ExpandSite" Value="Visible"/>
</Trigger>
<Trigger Property="ExpandDirection" Value="Up">
<Setter Property="DockPanel.Dock" TargetName="ExpandSite" Value="Top"/>
<Setter Property="DockPanel.Dock" TargetName="HeaderSite" Value="Bottom"/>
<Setter Property="Style" TargetName="HeaderSite" Value="{StaticResource ExpanderUpHeaderStyle}"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>