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改进的WPF MenuItem模板_wpf menuitem 样式

作者：小桥流水78 | 2024-06-26 05:54:46

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wpf menuitem 样式

为什么他们这么丑？

为什么菜单项看起来这么难看？我看看。首先，让我们创建没有任何图标的菜单：

这就是大多数人抱怨的：左边有一个视觉上空的单元格。它被设计成一个图标，但没有一个图标，这一切看起来都令人不安，就像无头骑士一样。首先，人们要求删除这个区域并放弃图标。有很多解决方案，我发现它们不令人满意。更重要的是，为什么要放弃图标？至少可以选择拥有它们会更好，但要有适当的渲染。

如果父菜单项的弹出区域中的所有或大多数菜单项都具有图标，则看起来会更好：

够好吗？一点也不！要查看问题，让我们放大菜单字体：

现在，图标无法正确呈现。在这里，我使用字符作为图标，为了简单起见，以及其他一些很好的理由，它确实有效。请注意，使用非默认字体大小时，表示字形的字符与菜单标题的字符不一致。如果我使用大小正好为16x16的位图字形，它总是适合的，但看起来与文本不一致。使用不同的图像大小时，会出现一些其他渲染问题，但通常，渲染任何具有较大尺寸的内容都永远不会准确。毋庸置疑，尝试匹配每个所需字体的大小将是一个非常糟糕的主意。这不仅完全不可靠，而且意味着要扼杀维护。

WPF Menu处理由任意类型的数据表示的MenuItem类型的文本菜单项和图标。

改进的外观

不是更好吗？

上图显示了我的最终结果。我故意把字体做得很大，以显示所有细节。在讨论问题和解决方案之前，让我们先看一下。完美吗？不，不是。首先，我不得不牺牲图标和标题区域之间的垂直分隔符。可以接受吗？由您决定。我想说，这种外观并不完全好，但仍然比没有修复要好。

对于那些选择不使用那些水平菜单分隔符的人来说，没有垂直分隔符从各方面来看都更好。此外，不同菜单项的图标以同一条垂直线为中心。

我测试了许多字体大小，甚至走到极端，以及不同的内容——一切正常。

现在，让我们讨论解决方案。

分析

当我查看Microsoft的默认WPF MenuItem模板时，我发现许多硬编码值会影响项目的大小和布局。很明显，该Menu控件被设计为与默认的固定字体和只有一个固定大小（16x16）的图标一起使用。换句话说，从我的角度来看，这是一个典型的临时布局示例——一个很大的设计错误。

但是，结构有点太复杂了，很容易被打破。我试图尽可能保守地修改它。首先，我发现在几个地方发现的16号是多余的，可以去掉。我还发现物品的高度是有限制的，限制等于22。我决定不删除它，而只是从Grid行大小中删除它。

最困难的问题是图标和标题区域之间的垂直分隔符。我决定放弃它并删除它，因为它的正确放置需要对一切进行彻底的重组。在默认的XAML代码中，三个Grid元素在同一个Grid.Raw中重叠，因此表示分隔符的Rectangle布局由硬编码Margins属性定义。我知道这是一个技巧，用于对齐几个堆叠菜单项的所有分隔符，但这是一种不好的做法。请注意，其他WPF控件（ListView，DataGrid）没有此问题。

解决方案

此代码可用作单独的ResourceDictionary文件：


<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
 
        <SolidColorBrush x:Key="Menu.Static.Background" Color="#FFF0F0F0"/>
        <SolidColorBrush x:Key="Menu.Static.Border" Color="#FF999999"/>
        <SolidColorBrush x:Key="Menu.Static.Foreground" Color="#FF212121"/>
        <!-- SA!!! removed because it is unused: the element using it cannot be positioned correctly as menu font size increases
        <SolidColorBrush x:Key="Menu.Static.Separator" Color="#FFD7D7D7"/>
        -->
        <SolidColorBrush x:Key="Menu.Disabled.Foreground" Color="#FF707070"/>
        <SolidColorBrush x:Key="MenuItem.Selected.Background" Color="#3D26A0DA"/>
        <SolidColorBrush x:Key="MenuItem.Selected.Border" Color="#FF26A0DA"/>
        <SolidColorBrush x:Key="MenuItem.Highlight.Background" Color="#3D26A0DA"/>
        <SolidColorBrush x:Key="MenuItem.Highlight.Border" Color="#FF26A0DA"/>
        <SolidColorBrush x:Key="MenuItem.Highlight.Disabled.Background" Color="#0A000000"/>
        <SolidColorBrush x:Key="MenuItem.Highlight.Disabled.Border" Color="#21000000"/>
        <MenuScrollingVisibilityConverter x:Key="MenuScrollingVisibilityConverter"/>
        <Geometry x:Key="DownArrow">M 0,0 L 3.5,4 L 7,0 Z</Geometry>
        <Geometry x:Key="UpArrow">M 0,4 L 3.5,0 L 7,4 Z</Geometry>
        <Geometry x:Key="RightArrow">M 0,0 L 4,3.5 L 0,7 Z</Geometry>
        <Geometry x:Key="Checkmark">F1 M 10.0,1.2 L 4.7,9.1 L 4.5,9.1 L 0,5.2 L 1.3,3.5 L 4.3,6.1L 8.3,0 L 10.0,1.2 Z</Geometry>
        <Style x:Key="MenuScrollButton" BasedOn="{x:Null}" TargetType="{x:Type RepeatButton}">
            <Setter Property="ClickMode" Value="Hover"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type RepeatButton}">
                        <Border x:Name="templateRoot" Background="Transparent" BorderBrush="Transparent" BorderThickness="1" SnapsToDevicePixels="true">
                            <ContentPresenter HorizontalAlignment="Center" Margin="6" VerticalAlignment="Center"/>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="{ComponentResourceKey ResourceId=MenuScrollViewer, TypeInTargetAssembly={x:Type FrameworkElement}}" BasedOn="{x:Null}" TargetType="{x:Type ScrollViewer}">
            <Setter Property="HorizontalScrollBarVisibility" Value="Hidden"/>
            <Setter Property="VerticalScrollBarVisibility" Value="Auto"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ScrollViewer}">
                        <Grid SnapsToDevicePixels="true">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="Auto"/>
                            </Grid.RowDefinitions>
                            <Border Grid.Column="0" Grid.Row="1">
                                <ScrollContentPresenter CanContentScroll="{TemplateBinding CanContentScroll}" Margin="{TemplateBinding Padding}"/>
                            </Border>
                            <RepeatButton Command="{x:Static ScrollBar.LineUpCommand}" CommandTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}" Grid.Column="0" Focusable="false" Grid.Row="0" Style="{StaticResource MenuScrollButton}">
                                <RepeatButton.Visibility>
                                    <MultiBinding ConverterParameter="0" Converter="{StaticResource MenuScrollingVisibilityConverter}" FallbackValue="Visibility.Collapsed">
                                        <Binding Path="ComputedVerticalScrollBarVisibility" RelativeSource="{RelativeSource TemplatedParent}"/>
                                        <Binding Path="VerticalOffset" RelativeSource="{RelativeSource TemplatedParent}"/>
                                        <Binding Path="ExtentHeight" RelativeSource="{RelativeSource TemplatedParent}"/>
                                        <Binding Path="ViewportHeight" RelativeSource="{RelativeSource TemplatedParent}"/>
                                    </MultiBinding>
                                </RepeatButton.Visibility>
                                <Path Data="{StaticResource UpArrow}" Fill="{StaticResource Menu.Static.Foreground}"/>
                            </RepeatButton>
                            <RepeatButton Command="{x:Static ScrollBar.LineDownCommand}" CommandTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}" Grid.Column="0" Focusable="false" Grid.Row="2" Style="{StaticResource MenuScrollButton}">
                                <RepeatButton.Visibility>
                                    <MultiBinding ConverterParameter="100" Converter="{StaticResource MenuScrollingVisibilityConverter}" FallbackValue="Visibility.Collapsed">
                                        <Binding Path="ComputedVerticalScrollBarVisibility" RelativeSource="{RelativeSource TemplatedParent}"/>
                                        <Binding Path="VerticalOffset" RelativeSource="{RelativeSource TemplatedParent}"/>
                                        <Binding Path="ExtentHeight" RelativeSource="{RelativeSource TemplatedParent}"/>
                                        <Binding Path="ViewportHeight" RelativeSource="{RelativeSource TemplatedParent}"/>
                                    </MultiBinding>
                                </RepeatButton.Visibility>
                                <Path Data="{StaticResource DownArrow}" Fill="{StaticResource Menu.Static.Foreground}"/>
                            </RepeatButton>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <ControlTemplate x:Key="{ComponentResourceKey ResourceId=TopLevelItemTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}" TargetType="{x:Type MenuItem}">
            <Border x:Name="templateRoot" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="true">
                <Grid VerticalAlignment="Center">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>
                    <ContentPresenter x:Name="Icon" ContentSource="Icon" HorizontalAlignment="Center" Margin="3" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center" />
                    <Path x:Name="GlyphPanel" Data="{StaticResource Checkmark}" FlowDirection="LeftToRight" Fill="{StaticResource Menu.Static.Foreground}" Margin="3" VerticalAlignment="Center" Visibility="Collapsed"/>
                    <ContentPresenter ContentSource="Header" Grid.Column="1" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                </Grid>
            </Border>
            <ControlTemplate.Triggers>
                <Trigger Property="Icon" Value="{x:Null}">
                    <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                </Trigger>
                <Trigger Property="IsChecked" Value="true">
                    <Setter Property="Visibility" TargetName="GlyphPanel" Value="Visible"/>
                    <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                </Trigger>
                <Trigger Property="IsHighlighted" Value="True">
                    <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Background}"/>
                    <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Border}"/>
                </Trigger>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="{StaticResource Menu.Disabled.Foreground}"/>
                    <Setter Property="Fill" TargetName="GlyphPanel" Value="{StaticResource Menu.Disabled.Foreground}"/>
                </Trigger>
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsHighlighted" Value="True"/>
                        <Condition Property="IsEnabled" Value="False"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Disabled.Background}"/>
                    <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Disabled.Border}"/>
                </MultiTrigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
        <ControlTemplate x:Key="{ComponentResourceKey ResourceId=TopLevelHeaderTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}" TargetType="{x:Type MenuItem}">
            <Border x:Name="templateRoot" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="true">
                <Grid VerticalAlignment="Center">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>
                    <ContentPresenter x:Name="Icon" ContentSource="Icon" HorizontalAlignment="Center" Margin="3" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center" />
                    <Path x:Name="GlyphPanel" Data="{StaticResource Checkmark}" FlowDirection="LeftToRight" Fill="{TemplateBinding Foreground}" Margin="3" VerticalAlignment="Center" Visibility="Collapsed"/>
                    <ContentPresenter ContentSource="Header" Grid.Column="1" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                    <Popup x:Name="PART_Popup" AllowsTransparency="true" Focusable="false" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" Placement="Bottom" PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}" PlacementTarget="{Binding ElementName=templateRoot}">
                        <Border x:Name="SubMenuBorder" Background="{StaticResource Menu.Static.Background}" BorderBrush="{StaticResource Menu.Static.Border}" BorderThickness="1" 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>
                                    <!-- SA!!! removed because it cannot be positioned correctly as menu font size increases
                                    <Rectangle Fill="{StaticResource Menu.Static.Separator}" HorizontalAlignment="Left" Margin="29,2,0,2" Width="1"/>
                                    -->
                                    <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="Icon" Value="{x:Null}">
                    <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                </Trigger>
                <Trigger Property="IsChecked" Value="true">
                    <Setter Property="Visibility" TargetName="GlyphPanel" Value="Visible"/>
                    <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                </Trigger>
                <Trigger Property="IsHighlighted" Value="True">
                    <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Background}"/>
                    <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Border}"/>
                </Trigger>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="{StaticResource Menu.Disabled.Foreground}"/>
                    <Setter Property="Fill" TargetName="GlyphPanel" Value="{StaticResource Menu.Disabled.Foreground}"/>
                </Trigger>
                <Trigger Property="ScrollViewer.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>
        <ControlTemplate x:Key="{ComponentResourceKey ResourceId=SubmenuItemTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}" TargetType="{x:Type MenuItem}">
            <Border x:Name="templateRoot" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="true">
                <Grid Margin="-1">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition MinWidth="22" SharedSizeGroup="MenuItemIconColumnGroup" Width="Auto"/>
                        <ColumnDefinition Width="13"/>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="30"/>
                        <ColumnDefinition SharedSizeGroup="MenuItemIGTColumnGroup" Width="Auto"/>
                        <ColumnDefinition Width="20"/>
                    </Grid.ColumnDefinitions>
                    <ContentPresenter x:Name="Icon" ContentSource="Icon" HorizontalAlignment="Center" Margin="3" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center" />
                    <Border x:Name="GlyphPanel" Background="{StaticResource MenuItem.Selected.Background}" BorderBrush="{StaticResource MenuItem.Selected.Border}" BorderThickness="1" ClipToBounds="False" HorizontalAlignment="Center" Height="22" Margin="-1,0,0,0" VerticalAlignment="Center" Visibility="Hidden" Width="22">
                        <Path x:Name="Glyph" Data="{StaticResource Checkmark}" FlowDirection="LeftToRight" Fill="{StaticResource Menu.Static.Foreground}" Height="11" Width="10"/>
                    </Border>
                    <ContentPresenter x:Name="menuHeaderContainer" ContentSource="Header" Grid.Column="2" HorizontalAlignment="Left" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center"/>
                    <TextBlock x:Name="menuGestureText" Grid.Column="4" Margin="{TemplateBinding Padding}" Opacity="0.7" Text="{TemplateBinding InputGestureText}" VerticalAlignment="Center"/>
                </Grid>
            </Border>
            <ControlTemplate.Triggers>
                <Trigger Property="Icon" Value="{x:Null}">
                    <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                </Trigger>
                <Trigger Property="IsChecked" Value="True">
                    <Setter Property="Visibility" TargetName="GlyphPanel" Value="Visible"/>
                    <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                </Trigger>
                <Trigger Property="IsHighlighted" Value="True">
                    <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Background}"/>
                    <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Border}"/>
                </Trigger>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="{StaticResource Menu.Disabled.Foreground}"/>
                    <Setter Property="Fill" TargetName="Glyph" Value="{StaticResource Menu.Disabled.Foreground}"/>
                </Trigger>
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsHighlighted" Value="True"/>
                        <Condition Property="IsEnabled" Value="False"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="Background" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Disabled.Background}"/>
                    <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Disabled.Border}"/>
                </MultiTrigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
        <ControlTemplate x:Key="{ComponentResourceKey ResourceId=SubmenuHeaderTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}" TargetType="{x:Type MenuItem}">
            <Border x:Name="templateRoot" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="true">
                <Grid Margin="-1">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition MinWidth="22" SharedSizeGroup="MenuItemIconColumnGroup" Width="Auto"/>
                        <ColumnDefinition Width="13"/>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="30"/>
                        <ColumnDefinition SharedSizeGroup="MenuItemIGTColumnGroup" Width="Auto"/>
                        <ColumnDefinition Width="20"/>
                    </Grid.ColumnDefinitions>
                    <ContentPresenter x:Name="Icon" ContentSource="Icon" HorizontalAlignment="Center" Margin="3" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center" />
                    <Border x:Name="GlyphPanel" Background="{StaticResource MenuItem.Highlight.Background}" BorderBrush="{StaticResource MenuItem.Highlight.Border}" BorderThickness="1" Height="22" Margin="-1,0,0,0" VerticalAlignment="Center" Visibility="Hidden" Width="22">
                        <Path x:Name="Glyph" Data="{DynamicResource Checkmark}" FlowDirection="LeftToRight" Fill="{StaticResource Menu.Static.Foreground}" Height="11" Width="9"/>
                    </Border>
                    <ContentPresenter ContentSource="Header" Grid.Column="2" HorizontalAlignment="Left" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center"/>
                    <TextBlock Grid.Column="4" Margin="{TemplateBinding Padding}" Opacity="0.7" Text="{TemplateBinding InputGestureText}" VerticalAlignment="Center"/>
                    <Path x:Name="RightArrow" Grid.Column="5" Data="{StaticResource RightArrow}" Fill="{StaticResource Menu.Static.Foreground}" HorizontalAlignment="Left" Margin="10,0,0,0" VerticalAlignment="Center"/>
                    <Popup x:Name="PART_Popup" AllowsTransparency="true" Focusable="false" HorizontalOffset="-2" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" Placement="Right" PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}" VerticalOffset="-3">
                        <Border x:Name="SubMenuBorder" Background="{StaticResource Menu.Static.Background}" BorderBrush="{StaticResource Menu.Static.Border}" BorderThickness="1" 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>
                                    <Rectangle Fill="{DynamicResource {x:Static SystemColors.ControlDarkBrushKey}}" HorizontalAlignment="Left" Margin="29,2,0,2" Width="1"/>
                                    <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="Icon" Value="{x:Null}">
                    <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                </Trigger>
                <Trigger Property="IsChecked" Value="True">
                    <Setter Property="Visibility" TargetName="GlyphPanel" Value="Visible"/>
                    <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                </Trigger>
                <Trigger Property="IsHighlighted" Value="True">
                    <Setter Property="Background" TargetName="templateRoot" Value="Transparent"/>
                    <Setter Property="BorderBrush" TargetName="templateRoot" Value="{StaticResource MenuItem.Highlight.Border}"/>
                </Trigger>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="TextElement.Foreground" TargetName="templateRoot" Value="{StaticResource Menu.Disabled.Foreground}"/>
                    <Setter Property="Fill" TargetName="Glyph" Value="{StaticResource Menu.Disabled.Foreground}"/>
                    <Setter Property="Fill" TargetName="RightArrow" Value="{StaticResource Menu.Disabled.Foreground}"/>
                </Trigger>
                <Trigger Property="ScrollViewer.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>
        <Style x:Key="MenuItemStyle1" TargetType="{x:Type MenuItem}">
            <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
            <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="BorderBrush" Value="Transparent"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
            <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
            <Setter Property="Template" Value="{DynamicResource {ComponentResourceKey ResourceId=SubmenuItemTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}}"/>
            <Style.Triggers>
                <Trigger Property="Role" Value="TopLevelHeader">
                    <Setter Property="Background" Value="Transparent"/>
                    <Setter Property="BorderBrush" Value="Transparent"/>
                    <Setter Property="Foreground" Value="{StaticResource Menu.Static.Foreground}"/>
                    <Setter Property="Template" Value="{DynamicResource {ComponentResourceKey ResourceId=TopLevelHeaderTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}}"/>
                    <Setter Property="Padding" Value="6,0"/>
                </Trigger>
                <Trigger Property="Role" Value="TopLevelItem">
                    <Setter Property="Background" Value="{StaticResource Menu.Static.Background}"/>
                    <Setter Property="BorderBrush" Value="{StaticResource Menu.Static.Border}"/>
                    <Setter Property="Foreground" Value="{StaticResource Menu.Static.Foreground}"/>
                    <Setter Property="Template" Value="{DynamicResource {ComponentResourceKey ResourceId=TopLevelItemTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}}"/>
                    <Setter Property="Padding" Value="6,0"/>
                </Trigger>
                <Trigger Property="Role" Value="SubmenuHeader">
                    <Setter Property="Template" Value="{DynamicResource {ComponentResourceKey ResourceId=SubmenuHeaderTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}}"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </ResourceDictionary>

无需引用在此资源字典中创建的样式。使用菜单将其包含在XAML中就足够了。然后，此资源字典将影响应用程序的所有项目。

请注意，可以使用以下ResourceDictionary.MergedDictionaries将资源字典包含在XAML中，请参阅文档文章合并的资源字典（WPF .NET）。

源资源字典不仅可以作为文件合并到XAML中，还可以作为资源或单独生成的程序集，使用对引用的程序集项目的程序集资源的引用。这可以通过使用包URI方案来实现，请参阅文档文章 WPF中的包URI。

测试

此解决方案在具有不同内容和字体大小的.NET 5到.NET 7上进行了测试。

结论

该解决方案确实有效。但是，它的目标是最小的修复，而没有尝试引入从根本上改进的结构。我对其进行了彻底的测试，该解决方案提供了比MenuItem默认模板更好的结果。

https://www.codeproject.com/Tips/5367587/Improved-WPF-MenuItem-Template

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