如何从 TreeView ContextMenu 获取 MenuItem 单击事件

发布于 2024-07-27 14:18:26 字数 1664 浏览 3 评论 0原文

我将 TreeViewItems 插入到 TreeView 控件中，并在插入时设置每个项目的样式。我根据要插入的节点 (TreeViewItem) 的类型分配不同的样式（在 XAML 中预定义）。一些样式包括上下文菜单。

我的问题是我无法在 MenuItems 上使用 Click="MyHandler"；我收到错误“根元素需要 ax:Class 属性来支持 XAML 文件中的事件处理程序。” 显然 Style 块中的元素都不是根元素。

任何建议都非常感激。

XAML：

<Style x:Key="Terrain" TargetType="{x:Type TreeViewItem}">
   <Setter Property="HeaderTemplate">
      <Setter.Value>
         <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <Canvas Background="{DynamicResource Terrain_icon}" />
                 <TextBlock Text="{Binding}" />
                 <StackPanel.ContextMenu>
                    <ContextMenu> 
                       <MenuItem Header="Edit..." Click="MyHandler"/> <!-- Error -->
                       <MenuItem Header="Add..."/>
                       <MenuItem Header="Delete"/>
                    </ContextMenu> 
                 </StackPanel.ContextMenu>
             </StackPanel>
          </DataTemplate>
        </Setter.Value>
     </Setter>
 </Style>

C#：

private void InsertTerrainNode(object sender, System.Windows.RoutedEventArgs e)
{
   // Add the new item under the first-level TreeViewItem
   TreeViewItem tvi = myTree.ItemContainerGenerator.ContainerFromItem(myTree.Items[0]) as TreeViewItem;
   TreeViewItem newTerrainNode = new TreeViewItem();
   newTerrainNode.Header = "Terrain";
   newTerrainNode.Style = (Style)this.FindResource("Terrain");
   tvi.Items.Insert(0,newTerrainNode);
}

原文

I am inserting TreeViewItems into a TreeView control and setting the style for each at the time of insertion. I am assigning different styles (predefined in XAML), depending on the type of node (TreeViewItem) I want to insert. Some of the styles include a ContextMenu.

My problem is that I am unable to use Click="MyHandler" on the MenuItems; I get an error "root element requires a x:Class attribute to support event handlers in the XAML file." and apparently none of the elements within the Style block are root elements.

Any suggestions much appreciated.

XAML:

<Style x:Key="Terrain" TargetType="{x:Type TreeViewItem}">
   <Setter Property="HeaderTemplate">
      <Setter.Value>
         <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <Canvas Background="{DynamicResource Terrain_icon}" />
                 <TextBlock Text="{Binding}" />
                 <StackPanel.ContextMenu>
                    <ContextMenu> 
                       <MenuItem Header="Edit..." Click="MyHandler"/> <!-- Error -->
                       <MenuItem Header="Add..."/>
                       <MenuItem Header="Delete"/>
                    </ContextMenu> 
                 </StackPanel.ContextMenu>
             </StackPanel>
          </DataTemplate>
        </Setter.Value>
     </Setter>
 </Style>

C#:

private void InsertTerrainNode(object sender, System.Windows.RoutedEventArgs e)
{
   // Add the new item under the first-level TreeViewItem
   TreeViewItem tvi = myTree.ItemContainerGenerator.ContainerFromItem(myTree.Items[0]) as TreeViewItem;
   TreeViewItem newTerrainNode = new TreeViewItem();
   newTerrainNode.Header = "Terrain";
   newTerrainNode.Style = (Style)this.FindResource("Terrain");
   tvi.Items.Insert(0,newTerrainNode);
}

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轻拂→两袖风尘 2024-08-03 14:18:26

使用命令，创建一个从 ICommand 派生的类，在该类中声明可以访问用户控件并且可以在 xaml 中访问并使用该命令绑定按钮。请参阅此处详细信息

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分分钟 2024-08-03 14:18:26

另一种选择是在创建 TreeViewItem 时将 MenuItem.Click 事件的事件处理程序添加到该 TreeViewItem 中。

private void InsertTerrainNode(object sender, System.Windows.RoutedEventArgs e)
{
    // Add the new item under the first-level TreeViewItem
    TreeViewItem tvi = myTree.ItemContainerGenerator.ContainerFromItem(myTree.Items[0]) as TreeViewItem;
    TreeViewItem newTerrainNode = new TreeViewItem();
    newTerrainNode.Header = "Terrain";
    newTerrainNode.Style = (Style)this.FindResource("Terrain");
    newTerrainNode.AddHandler(MenuItem.Click, OnTreeItemContextMenuClicked);
    tvi.Items.Insert(0,newTerrainNode);
}

private void OnTreeItemContextMenuClicked(object sender, RoutedEventArgs e)
{
    // Handle the ContextMenu item click here
    // e.OriginalSource can be used to get the ContextMenu item clicked if needed.
}

Another option is to add an event handler for the MenuItem.Click event to the TreeViewItem as you create it.

private void InsertTerrainNode(object sender, System.Windows.RoutedEventArgs e)
{
    // Add the new item under the first-level TreeViewItem
    TreeViewItem tvi = myTree.ItemContainerGenerator.ContainerFromItem(myTree.Items[0]) as TreeViewItem;
    TreeViewItem newTerrainNode = new TreeViewItem();
    newTerrainNode.Header = "Terrain";
    newTerrainNode.Style = (Style)this.FindResource("Terrain");
    newTerrainNode.AddHandler(MenuItem.Click, OnTreeItemContextMenuClicked);
    tvi.Items.Insert(0,newTerrainNode);
}

private void OnTreeItemContextMenuClicked(object sender, RoutedEventArgs e)
{
    // Handle the ContextMenu item click here
    // e.OriginalSource can be used to get the ContextMenu item clicked if needed.
}

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