Ağaçtaki düğümü seçin Sağda MVVM'yi tıklatın

Question

Sağ tıklamada ağaç görünümünde bir düğüm seçmek istiyorum. MVVM desenini kullanıyorum ve bunu kod arkasında yapmak istemiyorum. İşte ağaç görünümü için benim XAML.

<TreeView Margin="5,0,0,5" ItemsSource="{Binding TreePads}"> 
<TreeView.ItemContainerStyle > 
    <Style TargetType="{x:Type TreeViewItem}"> 
     <Setter Property="IsSelected" Value="{Binding DataContext.IsSelected, Mode=TwoWay, RelativeSource={RelativeSource Self}}" /> 
     <Setter Property="ContextMenu"> 
      <Setter.Value> 
       <ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}" > 
        <MenuItem IsEnabled="{Binding RenameMenuEnabled}" Header="Rename" Command="{Binding RenameCommand}" /> 
       </ContextMenu> 
      </Setter.Value> 
     </Setter> 
     <Style.Triggers> 
      <Trigger Property="IsSelected" Value="True"> 
      </Trigger> 
     </Style.Triggers> 
    </Style> 
</TreeView.ItemContainerStyle > 
<TreeView.Resources> 
    <HierarchicalDataTemplate DataType="{x:Type vm:TreePad}" ItemsSource="{Binding Members, Mode=TwoWay}"> 
     <StackPanel Orientation="Horizontal"> 
      <TextBlock Text="{Binding PadName}"/> 
     </StackPanel> 
    </HierarchicalDataTemplate> 
</TreeView.Resources> 

Answer 1

Bir DependencyProperty tanımlayabiliriz. Aşağıda, bunu başarmak için bir bağımlılık özelliği kullanan bir örnek uygulama paylaştım.

TreeViewExtension.cs

using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Input; 
using System.Windows.Media; 

namespace WpfApplication1 
{ 
    public static class TreeViewExtension 
    { 
     public static readonly DependencyProperty SelectItemOnRightClickProperty = DependencyProperty.RegisterAttached(
      "SelectItemOnRightClick", 
      typeof(bool), 
      typeof(TreeViewExtension), 
      new UIPropertyMetadata(false, OnSelectItemOnRightClickChanged)); 

     public static bool GetSelectItemOnRightClick(DependencyObject d) 
     { 
      return (bool)d.GetValue(SelectItemOnRightClickProperty); 
     } 

     public static void SetSelectItemOnRightClick(DependencyObject d, bool value) 
     { 
      d.SetValue(SelectItemOnRightClickProperty, value); 
     } 

     private static void OnSelectItemOnRightClickChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
     { 
      bool selectItemOnRightClick = (bool)e.NewValue; 

      TreeView treeView = d as TreeView; 
      if (treeView != null) 
      { 
       if (selectItemOnRightClick) 
        treeView.PreviewMouseRightButtonDown += OnPreviewMouseRightButtonDown; 
       else 
        treeView.PreviewMouseRightButtonDown -= OnPreviewMouseRightButtonDown; 
      } 
     } 

     private static void OnPreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e) 
     { 
      TreeViewItem treeViewItem = VisualUpwardSearch(e.OriginalSource as DependencyObject); 

      if (treeViewItem != null) 
      { 
       treeViewItem.Focus(); 
       e.Handled = true; 
      } 
     } 

     public static TreeViewItem VisualUpwardSearch(DependencyObject source) 
     { 
      while (source != null && !(source is TreeViewItem)) 
       source = VisualTreeHelper.GetParent(source); 

      return source as TreeViewItem; 
     } 
    } 
} 

XAML:

<Window x:Class="WpfApplication1.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:mvvmhelper="clr-namespace:WpfApplication1" 
     Title="MainWindow" Height="350" Width="525"> 
    <Grid> 
     <TreeView mvvmhelper:TreeViewExtension.SelectItemOnRightClick="true"> 
      <TreeViewItem Header="One"/> 
      <TreeViewItem Header="Two"/> 

      <TreeViewItem Header="Three"/> 
      <TreeView.ContextMenu> 
       <ContextMenu> 
        <MenuItem Header="Menu1"/> 
        <MenuItem Header="Menu2"/> 
       </ContextMenu> 
      </TreeView.ContextMenu> 
     </TreeView> 
    </Grid> 
</Window> 

Answer 2

kullanabilirsiniz etkileşim

xmlns:interactive="http://schemas.microsoft.com/expression/2010/interactivity" 

xaml:

<TreeView x:Name="TreeView" HorizontalAlignment="Left" Height="373" Margin="13,15,0,0" VerticalAlignment="Top" Width="373" Background="#29292f" 
        Foreground="White" BorderBrush="Transparent" BorderThickness="0" ItemsSource="{Binding EmtRoot}" FontSize="24" > 
      <interactive:Interaction.Triggers> 
       <interactive:EventTrigger EventName="SelectedItemChanged"> 
        <interactive:InvokeCommandAction Command="{Binding SelectItemCommand}" CommandParameter="{Binding ElementName=TreeView,Path=SelectedItem}"/> 
       </interactive:EventTrigger> 
      </interactive:Interaction.Triggers> 
      <TreeView.Resources> 
       <HierarchicalDataTemplate DataType="{x:Type models:EmtRootModel}" ItemsSource="{Binding Entities}"> 
        <TextBlock Text="Root" Foreground="White" ContextMenu="{StaticResource ContextMenuLevel0}"/> 
       </HierarchicalDataTemplate> 
       <HierarchicalDataTemplate DataType="{x:Type models:EntityModel}" ItemsSource="{Binding Slides}"> 
        <TextBlock Text="{Binding EntityName}" Foreground="White" ContextMenu="{StaticResource ContextMenuLevel1}"/> 
       </HierarchicalDataTemplate> 
       <DataTemplate DataType="{x:Type models:SlideModel}"> 
        <StackPanel Orientation="Horizontal" ContextMenu="{StaticResource ContextMenuLevel2}"> 
         <StackPanel.InputBindings> 
          <MouseBinding MouseAction="RightClick" 
               Command="{Binding ElementName=Emt,Path=DataContext.TreeViewRightClickCommand}" CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=TreeViewItem}}"/> 
         </StackPanel.InputBindings> 
         <TextBlock Text="{Binding SlideName}" Foreground="White"> 
          <TextBlock.InputBindings> 
           <MouseBinding MouseAction="LeftDoubleClick" 
               Command="{Binding ElementName=Emt,Path=DataContext.SlideDoubleClickCommand}" CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=TextBlock},Path=DataContext}"/> 
          </TextBlock.InputBindings> 
         </TextBlock> 
         <CheckBox IsChecked="{Binding IsChecked}" Foreground="White" /> 
        </StackPanel> 
       </DataTemplate> 
      </TreeView.Resources> 
     </TreeView> 

.210

Ve ViewModel:

private void ExecuteTreeViewRightClickCommand(object obj) 
     { 
      ((TreeViewItem)obj).IsSelected = true; 
      SelectedSlide = ((TreeViewItem)obj).Header as SlideModel; 
     }