使用 Icon 绑定的菜单和子菜单

Question

我使用this 解决方案来绑定我的Menu，就像在这个例子中一样，我想知道如何将icon 添加到我的MenuItem。

在我的模型中，我还有一个名为 IsSelected 的属性，所以我尝试了这种方法：

<Menu.ItemTemplate>
      <HierarchicalDataTemplate DataType="{x:Type Menu:MenuItemViewModel}" ItemsSource="{Binding Path=MenuItems}">
      <StackPanel Orientation="Horizontal">
         <Image Source="pack://application:,,,/Resources/checked_lightslategray.ico"
                Width="12"
                Height="12"
                Margin="0,0,0,0">
                <Image.Style>
                    <Style TargetType="Image">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding Path=IsSelected}" Value="True">
                                   <Setter Property="Visibility" Value="Visible"/>
                            </DataTrigger>
                            <DataTrigger Binding="{Binding Path=IsSelected}" Value="False">
                                    <Setter Property="Visibility" Value="Collapsed"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Image.Style>
            </Image>
        <TextBlock Text="{Binding Description}" Margin="10,0,0,0"/>
        </StackPanel>
    </HierarchicalDataTemplate>
</Menu.ItemTemplate>

但正如你所见，这看起来很糟糕：

任何想法如何将此image 移动到我的MenuItem 左侧的图标位置？

编辑

这是我正在使用的样式：

<Style TargetType="{x:Type Menu}" x:Key="StandardMenu">
        <Style.Resources>
            <Style x:Key="{x:Static MenuItem.SeparatorStyleKey}" TargetType="Separator">
                <Setter Property="Height" Value="1"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="Separator">
                            <Border BorderBrush="{StaticResource MenuSeparatorBorderBrush}" BorderThickness="1" Margin="25,0,0,0"/>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
            <Style TargetType="{x:Type MenuItem}">
                <Setter Property="Foreground" Value="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType={x:Type Menu}}}"/>
                <Setter Property="FontSize" Value="{DynamicResource ApplicationFontSize}"/>
                <Setter Property="Command" Value="{Binding Command}"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type MenuItem}">
                            <!--Border 1-->
                            <Border x:Name="Border" Background="Transparent" BorderBrush="Transparent"  CornerRadius="2"
                                    BorderThickness="1" SnapsToDevicePixels="False">
                                <Grid x:Name="Grid">
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition x:Name="Col0" MinWidth="17" Width="Auto" SharedSizeGroup="MenuItemIconColumnGroup"/>
                                        <ColumnDefinition Width="Auto" SharedSizeGroup="MenuTextColumnGroup"/>
                                        <ColumnDefinition Width="Auto" SharedSizeGroup="MenuItemIGTColumnGroup"/>
                                        <ColumnDefinition x:Name="Col3" Width="14"/>
                                    </Grid.ColumnDefinitions>
                                    <ContentPresenter Grid.Column="0" x:Name="Icon" VerticalAlignment="Center" ContentSource="Icon"/>
                                    <ContentPresenter Grid.Column="1" Margin="{TemplateBinding Padding}" x:Name="HeaderHost" RecognizesAccessKey="True" ContentSource="Header" VerticalAlignment="Center"/>
                                    <ContentPresenter Grid.Column="2" Margin="8,1,8,1" x:Name="IGTHost" ContentSource="InputGestureText" VerticalAlignment="Center"/>
                                    <Grid Grid.Column="3" Margin="4,0,6,0" x:Name="ArrowPanel" VerticalAlignment="Center">
                                        <Path x:Name="ArrowPanelPath" HorizontalAlignment="Right" VerticalAlignment="Center" Fill="{TemplateBinding Foreground}" Data="M0,0 L0,8 L4,4 z"/>
                                    </Grid>
                                    <Popup IsOpen="{Binding Path=IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" 
                                           Placement="Right"
                                           HorizontalOffset="-1" 
                                           x:Name="SubMenuPopup"
                                           Focusable="false"
                                           PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}"
                                           AllowsTransparency="True">
                                        <Grid Margin="0,0,5,5">
                                            <!--Border 2-->
                                            <Border x:Name="SubMenuBorder" CornerRadius="5"
                                                    BorderBrush="{StaticResource MenuSeparatorBorderBrush}"
                                                    BorderThickness="1" 
                                                    Background="{StaticResource SubmenuItemBackground}" 
                                                    SnapsToDevicePixels="True">
                                                <Grid x:Name="SubMenu" Grid.IsSharedSizeScope="True" Margin="2">
                                                    <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Cycle"/>
                                                </Grid>
                                                <Border.Effect>
                                                    <DropShadowEffect ShadowDepth="2" Color="Black"/>
                                                </Border.Effect>
                                            </Border>
                                            <!--Border 3-->
                                            <Border Margin="1,0,0,0"
                                                    x:Name="TransitionBorder"
                                                    Width="0" 
                                                    Height="2" 
                                                    VerticalAlignment="Top"
                                                    HorizontalAlignment="Left" 
                                                    Background="{StaticResource SubmenuItemBackground}"
                                                    SnapsToDevicePixels="False"
                                                    BorderThickness="1" 
                                                    BorderBrush="{StaticResource SubmenuItemBackground}"/>
                                        </Grid>
                                    </Popup>
                                </Grid>
                            </Border>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </Style.Resources>
        <Setter Property="Background" Value="{StaticResource LightBackground}"/>
        <Setter Property="Foreground" Value="{StaticResource Foreground}"/>
    </Style>

Answer 1

在图像样式触发器上，您已将图像可见性设置为折叠，这将释放图像所需的空间，并且当没有图像可见时内容将向左移动。

有两种方法可以解决这个问题。

选项 1： 而不是折叠的可见性，而是隐藏的可见性。

<Menu.ItemTemplate>
      <HierarchicalDataTemplate DataType="{x:Type Menu:MenuItemViewModel}" ItemsSource="{Binding Path=MenuItems}">
      <StackPanel Orientation="Horizontal">
         <Image Source="pack://application:,,,/Resources/checked_lightslategray.ico"
                Width="12"
                Height="12"
                Margin="0,0,0,0">
                <Image.Style>
                    <Style TargetType="Image">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding Path=IsSelected}" Value="True">
                                   <Setter Property="Visibility" Value="Visible"/>
                            </DataTrigger>
                            <DataTrigger Binding="{Binding Path=IsSelected}" Value="False">
                                    <Setter Property="Visibility" Value="Hidden"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Image.Style>
            </Image>
        <TextBlock Text="{Binding Description}" Margin="10,0,0,0"/>
        </StackPanel>
    </HierarchicalDataTemplate>
</Menu.ItemTemplate>

选项 2： - 使用标题属性来定义你的描述 - 用来定义你的形象

<HierarchicalDataTemplate  ItemsSource="{Binding Path=MenuItems}">
                        <MenuItem Header="{Binding Header}" ItemsSource="{Binding Path=MenuItems}" FontWeight="Bold">
                            <MenuItem.Icon>
                                <Image Source="pack://application:,,,/Resources/checked_lightslategray.ico">
                                    <Image.Style>
                                        <Style TargetType="Image">
                                            <Style.Triggers>
                                                <DataTrigger Binding="{Binding Path=IsSelected}" Value="True">
                                                    <Setter Property="Visibility" Value="Visible"/>
                                                </DataTrigger>
                                                <DataTrigger Binding="{Binding Path=IsSelected}" Value="False">
                                                    <Setter Property="Visibility" Value="Collapsed"/>
                                                </DataTrigger>
                                            </Style.Triggers>
                                        </Style>
                                    </Image.Style>
                                </Image>
                            </MenuItem.Icon>
                            <MenuItem.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <VirtualizingStackPanel Orientation="Horizontal"/>
                                </ItemsPanelTemplate>
                            </MenuItem.ItemsPanel>
                        </MenuItem>
                    </HierarchicalDataTemplate>

Answer 2

把这个放到你的Menu.Resources 并从StackPanel 中删除Image：

<Menu.Resources>
    <Image x:Key="img" x:Shared="false" Source="pack://application:,,,/Resources/checked_lightslategray.ico"/>
    <Style TargetType="MenuItem">
        <Style.Triggers>
            <DataTrigger Binding="{Binding IsSelected}" Value="true">
                <Setter Property="Icon" Value="{StaticResource img}"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>
</Menu.Resources>