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定义ContextMenu样式

1. 定义字典文件

   <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   
       <!--阿里矢量库的图标-->
       <FontFamily x:Key="Iconfont">
           /Assets/Fonts/#iconfont
       </FontFamily>
       
       
       
       <!--  Separator  -->
       <Style x:Key="SeparatorStyle" TargetType="{x:Type Separator}">
           <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType="{x:Type Separator}">
                       <Border Height="0.7" Background="#ededef" />
                   </ControlTemplate>
               </Setter.Value>
           </Setter>
       </Style>
   
       <!--  Outer menu items  -->
       <Style TargetType="{x:Type MenuItem}">
           <Style.Triggers>
               <Trigger Property="IsHighlighted" Value="False">
                   <Setter Property="Height" Value="35" />
               </Trigger>
               <Trigger Property="IsHighlighted" Value="True">
                   <Setter Property="Height" Value="35" />
               </Trigger>
               <Trigger Property="IsEnabled" Value="False">
                   <Setter Property="Foreground" Value="#98989c" />
               </Trigger>
               <Trigger Property="IsEnabled" Value="True">
                   <Setter Property="Foreground" Value="#010101" />
               </Trigger>
           </Style.Triggers>
       </Style>
   
       <!--  Outer menu  -->
       <Style TargetType="{x:Type ContextMenu}">
           <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType="{x:Type ContextMenu}">
                       <!--  Here is where you change the border thickness to zero on the menu  -->
                       <Border Padding="5"  Width="{TemplateBinding Width}">
                           <Border.Effect>
                               <DropShadowEffect Color="#1e1e1e00" ShadowDepth="0" BlurRadius="5" Opacity="0.1" Direction="0"/>
                           </Border.Effect>
                           <Border x:Name="Border" CornerRadius="5" Padding="0 5">
                               <StackPanel
                                   ClipToBounds="True"
                                   IsItemsHost="True"
                                   KeyboardNavigation.DirectionalNavigation="Cycle"
                                   Orientation="Vertical" />
                           </Border>
                       </Border>
                       <ControlTemplate.Triggers>
                           <Trigger Property="IsMouseOver" Value="true">
                               <Setter TargetName="Border" Property="Background" Value="#ffffff" />
                           </Trigger>
                       </ControlTemplate.Triggers>
                   </ControlTemplate>
               </Setter.Value>
           </Setter>
       </Style>
   
       <!--  SubmenuItem  -->
       <ControlTemplate x:Key="{x:Static MenuItem.SubmenuItemTemplateKey}" TargetType="{x:Type MenuItem}">
           <Border Name="Border" Background="Transparent" ClipToBounds="True">
               <Grid>
                   <StackPanel Orientation="Horizontal" >
                       <TextBlock Text="{TemplateBinding Icon}" FontSize="16" Margin="10 0 10 0" Foreground="#595959"
                              FontFamily="{DynamicResource Iconfont}" VerticalAlignment="Center"/>
                       <TextBlock Text="{TemplateBinding Header}" 
                                  FontSize="14" VerticalAlignment="Center" 
                                  TextTrimming="CharacterEllipsis" 
                                  MaxWidth="150"
                                  ToolTip="{TemplateBinding Header}"/>
                   </StackPanel>
                   <TextBlock x:Name="Checkabled" Text="&#xeaf1;" FontSize="14" 
                              VerticalAlignment="Center" 
                              FontFamily="{DynamicResource Iconfont}" 
                              Visibility="Collapsed" 
                              Foreground="red" HorizontalAlignment="Right" Margin="0 0 10 0"/>
               </Grid>
           </Border>
           <ControlTemplate.Triggers>
               <Trigger Property="IsHighlighted" Value="true">
                   <Setter TargetName="Border" Property="Background" Value="#f2f2f2" />
               </Trigger>
               <Trigger Property="IsEnabled" Value="false">
                   <Setter Property="Foreground" Value="#0f3c5a" />
               </Trigger>
               <Trigger Property="IsCheckable" Value="true">
                   <Setter Property="Visibility" TargetName="Checkabled" Value="Visible" />
               </Trigger>
           </ControlTemplate.Triggers>
       </ControlTemplate>
   
       <!--  SubmenuHeader  -->
       <ControlTemplate x:Key="{x:Static MenuItem.SubmenuHeaderTemplateKey}" TargetType="{x:Type MenuItem}">
           <Border Name="Border">
               <Grid Background="Transparent">
                   <StackPanel Orientation="Horizontal">
                       <TextBlock Text="{TemplateBinding Icon}" FontSize="16" Margin="10 0 10 0" Foreground="#595959"
                           FontFamily="{DynamicResource Iconfont}" VerticalAlignment="Center"/>
                       <TextBlock Text="{TemplateBinding Header}" FontSize="14" VerticalAlignment="Center"/>
                   </StackPanel>
                   <TextBlock Text="&#xe629;" 
                              FontSize="10"
                              VerticalAlignment="Center" 
                              HorizontalAlignment="Right" 
                              Margin="0 0 10 0" FontFamily="{DynamicResource Iconfont}"/>
                   <Popup
                       Name="Popup"
                       AllowsTransparency="True"
                       Focusable="False"
                       Width="{TemplateBinding Width}"
                       HorizontalOffset="-5"
                       IsOpen="{TemplateBinding IsSubmenuOpen}"
                       Placement="Right"
                       PopupAnimation="Fade">
                       <StackPanel Orientation="Horizontal">
                           <Border Width="5" Height="35" Background="White" Opacity="0.01"/>
                           <Border Padding="5">
                               <Border.Effect>
                                   <DropShadowEffect Color="#1e1e1e00" ShadowDepth="0" BlurRadius="5" Opacity="0.1" Direction="0"/>
                               </Border.Effect>
                               <Border Width="{TemplateBinding Width}"
                                   Name="SubmenuBorder"
                                   Background="White">
                                   <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Cycle" />
                               </Border>
                           </Border>
                       </StackPanel>
                   </Popup>
               </Grid>
           </Border>
   
           <ControlTemplate.Triggers>
               <Trigger Property="IsHighlighted" Value="true">
                   <Setter TargetName="Border" Property="Background" Value="#f2f2f2" />
               </Trigger>
               <Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="True">
                   <Setter TargetName="SubmenuBorder" Property="CornerRadius" Value="4" />
                   <Setter TargetName="SubmenuBorder" Property="Padding" Value="0,3,0,3" />
               </Trigger>
               <Trigger Property="IsEnabled" Value="false">
                   <Setter Property="Foreground" Value="#0f3c5a" />
               </Trigger>
           </ControlTemplate.Triggers>
       </ControlTemplate>
   </ResourceDictionary>

2. 使用

   <MenuItem Header="完整模式" Icon="&#xe64c;">
       <MenuItem Header="完整模式" Width="150" Icon="&#xe64c;"/>
       <MenuItem Header="mini模式" Width="150" Icon="&#xe64e;"/>
       <MenuItem Header="最小化" Width="150" Icon="&#xe65a;"/>
   </MenuItem>
   <MenuItem Header="打开桌面歌曲" Icon="&#xe61d;"/>
   <MenuItem Header="锁定桌面歌词" Icon="&#xe669;"/>