これを行うにはいくつかの方法があります。IsLeaf
基になるビュー モデルのプロパティにバインドされたトリガーを使用して、コンテキスト メニューを適用する 1 つの方法を次に示します。
MainWindow.xaml:
<Window x:Class="WpfScratch.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Window.Resources>
<!-- the context menu for all tree view items -->
<ContextMenu x:Key="TreeViewItemContextMenu">
<MenuItem Header="Rename" />
<MenuItem Header="Delete" />
</ContextMenu>
<!-- the data template for all tree view items -->
<HierarchicalDataTemplate x:Key="TreeViewItemTemplate" ItemsSource="{Binding Nodes}">
<TextBlock x:Name="TextBlock" Text="{Binding Text}" />
<HierarchicalDataTemplate.Triggers>
<DataTrigger Binding="{Binding IsLeaf}" Value="True">
<Setter TargetName="TextBlock" Property="ContextMenu" Value="{StaticResource TreeViewItemContextMenu}" />
</DataTrigger>
</HierarchicalDataTemplate.Triggers>
</HierarchicalDataTemplate>
</Window.Resources>
<!-- the treeview -->
<TreeView DataContext="{Binding TreeView}"
ItemsSource="{Binding Nodes}"
ItemTemplate="{StaticResource TreeViewItemTemplate}">
</TreeView>
</Window>
MainWindow.xaml.cs:
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
DataContext = new MainWindowModel(
new MainWindowTreeViewModel(
new MainWindowTreeViewNodeModel(
"1",
new MainWindowTreeViewNodeModel("A"),
new MainWindowTreeViewNodeModel("B"),
new MainWindowTreeViewNodeModel("C")),
new MainWindowTreeViewNodeModel(
"2",
new MainWindowTreeViewNodeModel("A"),
new MainWindowTreeViewNodeModel("B"),
new MainWindowTreeViewNodeModel("C")),
new MainWindowTreeViewNodeModel(
"3",
new MainWindowTreeViewNodeModel("A"),
new MainWindowTreeViewNodeModel("B"),
new MainWindowTreeViewNodeModel("C"))));
}
}
MainWindowModel.cs:
public class MainWindowModel
{
public MainWindowModel(MainWindowTreeViewModel treeView)
{
TreeView = treeView;
}
public MainWindowTreeViewModel TreeView { get; private set; }
}
public class MainWindowTreeViewModel
{
public MainWindowTreeViewModel(params MainWindowTreeViewNodeModel[] nodes)
{
Nodes = nodes.ToList().AsReadOnly();
}
public ReadOnlyCollection<MainWindowTreeViewNodeModel> Nodes { get; private set; }
}
public class MainWindowTreeViewNodeModel
{
public MainWindowTreeViewNodeModel(string text, params MainWindowTreeViewNodeModel[] nodes)
{
Text = text;
Nodes = nodes.ToList().AsReadOnly();
}
public string Text { get; private set; }
public ReadOnlyCollection<MainWindowTreeViewNodeModel> Nodes { get; private set; }
public bool IsLeaf { get { return Nodes.Count == 0; } }
}