如何改变使用DrawingImage插入的图标的颜色

Question

我想改变鼠标悬停时图标的颜色。此图标将用于根菜单项。我使用的代码是:

<Style x:Key="MenuIcon" 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>

我想在鼠标悬停时将画笔的颜色从红色更改为白色。如何做到这一点?

MenuItemControlTemplate1在上述样式中的使用如下:

<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>
<Image Grid.Column="0" Source="{TemplateBinding Icon}"/>
<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="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>
</ControlTemplate.Triggers>
</ControlTemplate>

Answer 1

<Style x:Key="MenuIcon" TargetType="{x:Type MenuItem}">
<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.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType=MenuItem}, Path=IsMouseOver}" Value="True">
<Setter Property="Icon">
<Setter.Value>
<DrawingImage>
<DrawingImage.Drawing>
<GeometryDrawing Geometry="M6 36v-3h36v3Zm0-10.5v-3h36v3ZM6 15v-3h36v3Z" Brush="White"/>
</DrawingImage.Drawing>
</DrawingImage>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>

代替TargetType="{x:Type MenuItem}"
您需要放置MenuItem的父元素。例如，如果您的情况是这样的:

<Grid>
<MenuItem Style="{StaticResource MenuIcon}"/>
</Grid>

那么这样做:

<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType=Grid}, Path=IsMouseOver}" Value="True">
<Setter Property="Icon">
<Setter.Value>
<DrawingImage>
<DrawingImage.Drawing>
<GeometryDrawing Geometry="M6 36v-3h36v3Zm0-10.5v-3h36v3ZM6 15v-3h36v3Z" Brush="White"/>
</DrawingImage.Drawing>
</DrawingImage>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>