12

如何使用分层数据模板在 wpf 中显示树视图项的上下文菜单？如何仅为 CountryTemplate 显示上下文菜单：

  <HierarchicalDataTemplate  x:Key="DispTemplate">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="{Binding Path=Label}" Style="{StaticResource TreeTextStyle}" ToolTip="{Binding Path=Description}" Tag="{Binding Path=Tag}">
            </TextBlock>
        </StackPanel>
    </HierarchicalDataTemplate>
    <HierarchicalDataTemplate  x:Key="BuildingTemplate"  ItemsSource="{Binding Path=Building}" ItemTemplate="{StaticResource BuildingTemplate}">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="{Binding Path=Label}" Style="{StaticResource TreeTextStyle}" ToolTip="{Binding Path=Description}"/>
        </StackPanel>
    </HierarchicalDataTemplate>
    <HierarchicalDataTemplate  x:Key="CityTemplate"  ItemsSource="{Binding Path=City}" ItemTemplate="{StaticResource CityTemplate}">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="{Binding Path=Label}" Style="{StaticResource TreeTextStyle}" ToolTip="{Binding Path=Description}"/>
        </StackPanel>
    </HierarchicalDataTemplate>
    <HierarchicalDataTemplate x:Key="CountryTemplate" ItemsSource="{Binding Path=Country}" ItemTemplate="{StaticResource CountryTemplate}">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="{Binding Path=RootName}" Style="{StaticResource TreeTextStyle}" ToolTip="{Binding Path=Description}"/>
        </StackPanel>
    </HierarchicalDataTemplate>
4

4 回答 4

16

您还可以将 添加ContextMenu到数据模板中的任何可视子项中，例如：

<HierarchicalDataTemplate x:Key="CountryTemplate" ItemsSource="{Binding Path=Country}" ItemTemplate="{StaticResource CountryTemplate}">
    <StackPanel Orientation="Horizontal">
        <StackPanel.ContextMenu>
            <ContextMenu>
                 <MenuItem Header="Header" Command="{Binding Command}"/> <!--This command should be in the data context (each country item)-->
            </ContextMenu>
        </StackPanel.ContextMenu>
        <TextBlock Text="{Binding Path=RootName}" Style="{StaticResource TreeTextStyle}" ToolTip="{Binding Path=Description}"/>
    </StackPanel>
</HierarchicalDataTemplate>
于 2012-11-16T19:39:44.700 回答
5

上下文菜单无法尽可能干净地工作的原因之一是因为默认情况下，它们与其他所有内容位于不同的可视化树中，因此DataContext无法找到。

关键的见解是创建一个<Style>定义上下文菜单的样式，然后将该样式附加到目标元素，从而连接上下文菜单。这会将上下文菜单转换为与您想要的默认值对齐的可视树。DataContext

首先，创建样式：

<UserControl.Resources>                                                                                                                        
    <ResourceDictionary>

        <!-- For the context menu to work, we must shift it into a style, which means that the context menu is now in a
        visual tree that is more closely related to the current data context. All we have to do then is set the style, 
        which hooks up the context menu. -->
        <Style x:Key="ContextMenuStyle" TargetType="{x:Type StackPanel}">
            <Setter Property="ContextMenu" Value="{DynamicResource TreeViewContextMenu}"/>
        </Style>
        <ContextMenu x:Key="TreeViewContextMenu">
            <MenuItem Header="Test" Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.CmdDisplayDetailsGraph}"/>
        </ContextMenu>

然后，将上下文菜单连接到您想要的任何位置，而不会遇到由不同的视觉树引起的问题。

示例 1：

<HierarchicalDataTemplate DataType="{x:Type snapshot:Details}" ItemsSource="{Binding DetailsList}">
    <StackPanel Orientation="Vertical" Style="{StaticResource ContextMenuStyle}">
        <ContentPresenter Content="{Binding}" ContentTemplate="{Binding View.DefaultDataRowTemplate}" />
</StackPanel>

示例 2：

<DataTemplate DataType="{x:Type snapshot:InstrumentDetails}">
  <StackPanel Orientation="Vertical" Style="{StaticResource ContextMenuStyle}">                 
      <Grid HorizontalAlignment="Stretch" VerticalAlignment="Center">
于 2015-02-03T23:12:19.167 回答
3 
<HierarchicalDataTemplate x:Key="CountryTemplate" ItemsSource="{Binding Path=Country}" ItemContainerStyle="{StaticResource CountryTemplateItemContainerStyle}" ItemTemplate="{StaticResource CountryTemplate}">
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="{Binding Path=RootName}" Style="{StaticResource TreeTextStyle}" ToolTip="{Binding Path=Description}" />
                        </StackPanel>
</HierarchicalDataTemplate>


<Style x:Key="CountryTemplateItemContainerStyle" TargetType="{x:Type TreeViewItem}">
<Setter Property="ContextMenu" Value="{DynamicResource TreeViewContextMenu}"/>
</Style>
 <ContextMenu x:Key="TreeViewContextMenu">
        <MenuItem .../>
 </ContextMenu>

如您所见，您可以在 HierarchicalDataTemplate 的 Itemcontainerstyle 中添加上下文菜单

于 2012-11-16T17:04:18.673 回答
3

基本上我想出了这个

<HierarchicalDataTemplate  x:Key="ChildTemplate">
            <StackPanel Orientation="Horizontal">
                <StackPanel.ContextMenu>
                    <ContextMenu>
                        <MenuItem Header="Copy" CommandParameter="{Binding CopyTag}">
                        </MenuItem>
                        <MenuItem Header="Paste" CommandParameter="{Binding PasteTag}">
                        </MenuItem>
                        <ContextMenu.ItemContainerStyle>
                            <Style TargetType="MenuItem">
                                <Setter Property="Command" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.CopyPaste}"/>
                            </Style>
                        </ContextMenu.ItemContainerStyle>
                    </ContextMenu>
                </StackPanel.ContextMenu>
                <Image Source="/Images/Child.png" Stretch="None" VerticalAlignment="Center" HorizontalAlignment="Center" Style="{StaticResource TreeIconStyle}"/>
                <TextBlock Text="{Binding Path=Label}" Style="{StaticResource TreeTextStyle}" ToolTip="{Binding Path=Description}" Tag="{Binding Path=Tag}">
                </TextBlock>
            </StackPanel>
        </HierarchicalDataTemplate>

并具有用于复制和粘贴的单独参数，以区分单个命令中的复制和粘贴。

于 2012-11-19T22:56:20.007 回答