如何使用控件模板在菜单项中插入图标

Question

我的GUI包含一个下拉菜单。根菜单项只包含一个图标。我想在下面的控制模板中插入一个图标("M6 36v-3h36v3Zm0-10.5v-3h36v3ZM6 15v-3h36v3Z")。我无法使用用户定义的控件模板在菜单项中插入图标。如何做到这一点?

<ControlTemplate x:Key="MenuItemControlTemplate1" TargetType="{x:Type MenuItem}">
<Border x:Name="templateRoot" 
BorderBrush="#535353" 
CornerRadius="3" 
BorderThickness="1" 
Background="{TemplateBinding Background}" 
SnapsToDevicePixels="True">
<Grid VerticalAlignment="Center">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ContentPresenter ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" Grid.Column="1" ContentStringFormat="{TemplateBinding HeaderStringFormat}" ContentSource="Header" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
<Popup x:Name="PART_Popup"  AllowsTransparency="True" Focusable="False" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}" Placement="Bottom" HorizontalOffset="-2">
<Border x:Name="SubMenuBorder" BorderBrush="#595959" BorderThickness="1" Background="#3A3A3A" Padding="2">
<ScrollViewer x:Name="SubMenuScrollViewer" Style="{DynamicResource {ComponentResourceKey ResourceId=MenuScrollViewer, TypeInTargetAssembly={x:Type FrameworkElement}}}">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect" Fill="{Binding Background, ElementName=SubMenuBorder}" Height="{Binding ActualHeight, ElementName=SubMenuBorder}" Width="{Binding ActualWidth, ElementName=SubMenuBorder}"/>
</Canvas>
<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Cycle" Grid.IsSharedSizeScope="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.TabNavigation="Cycle"/>
</Grid>
</ScrollViewer>
</Border>
</Popup>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSuspendingPopupAnimation" Value="True">
<Setter Property="PopupAnimation" TargetName="PART_Popup" Value="None"/>
</Trigger>
<Trigger Property="IsHighlighted" Value="True">
<Setter Property="Background" TargetName="templateRoot" Value="{StaticResource DarkBrush}"/>
<Setter Property="BorderBrush" TargetName="templateRoot" Value="#2C2C2C"/>
<Setter Property="BorderThickness" TargetName="templateRoot" Value="1"></Setter>
</Trigger>
<Trigger Property="CanContentScroll" SourceName="SubMenuScrollViewer" Value="False">
<Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="{Binding VerticalOffset, ElementName=SubMenuScrollViewer}"/>
<Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="{Binding HorizontalOffset, ElementName=SubMenuScrollViewer}"/>
</Trigger>
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Setter TargetName="templateRoot" Property="Background" Value="{StaticResource Clicked}" />
<Setter Property="Header" Value="Test" />
<Setter Property="BorderBrush" Value="#2C2C2C"></Setter>
<Setter Property="BorderThickness" Value="1"></Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>

Answer 1

在ContentPresenter之前插入<Image Grid.Column="0" Source="{TemplateBinding Icon}"/>，并设置MenuItem.Icon属性为对Image.Source有效的对象

在路径数据的情况下，您可以使用DrawingImage并使用此ControlTemplate创建一个样式，如下所示。

<Style x:Key="HamburgerMenuItemStyle" TargetType="{x:Type MenuItem}">
<Setter Property="Template" Value="{StaticResource MenuItemControlTemplate1}"/>
<Setter Property="Icon">
<Setter.Value>
<DrawingImage>
<DrawingImage.Drawing>
<GeometryDrawing Geometry="M6 36v-3h36v3Zm0-10.5v-3h36v3ZM6 15v-3h36v3Z"
Brush="Red"/>
</DrawingImage.Drawing>
</DrawingImage>
</Setter.Value>
</Setter>
</Style>