Question

我想在treevieew上拖一并放下treeview拖曳

TreeView之一

<TreeView Name="tvMain" FontSize="14"  Grid.Row="2" Background="#FFF9F9F9"  >
                <TreeView.ItemContainerStyle>
                    <Style TargetType="{x:Type TreeViewItem}">
                        <EventSetter Event="MouseDoubleClick" Handler="TreeView_MouseDoubleClick" />
                        <EventSetter Event="MouseRightButtonDown" Handler="TreeView_MouseRightClick" />
                    </Style>
                </TreeView.ItemContainerStyle>
                    <TreeView.ItemTemplate>
                    <HierarchicalDataTemplate >
                        <StackPanel  Orientation="Horizontal">
                                <Image DragDrop.DragOver="Image_DragOver" Margin="2" Width="14" Height="14" Source="{Binding Path=ImageUrl}" HorizontalAlignment="Right" VerticalAlignment="Center" ></Image>
                            <TextBlock Margin="2" Text="{Binding Path=Name}"  MinWidth="280" Width="{Binding Path=SizeOfName}" VerticalAlignment="Center"  />
                            <TextBlock Name="lb_params" Text="{Binding Params}" Width="{Binding Path=SizeParams}" VerticalAlignment="Center" TextAlignment="Center"/>

                        </StackPanel>
                    </HierarchicalDataTemplate>
                </TreeView.ItemTemplate>
            </TreeView>

TreeView拖曳

<TreeView Name="tvMain"  FontSize="14"  Grid.Row="2" Background="#FFF9F9F9"  >
                <TreeView.ItemContainerStyle>
                    <Style TargetType="{x:Type TreeViewItem}">
                        <EventSetter Event="MouseDoubleClick" Handler="TreeView_MouseDoubleClick" />
                        <EventSetter Event="MouseRightButtonDown" Handler="TreeView_MouseRightClick" />
                    </Style>
                </TreeView.ItemContainerStyle>
                <TreeView.ItemTemplate>
                    <HierarchicalDataTemplate >
                        <StackPanel Orientation="Horizontal">
                            <Image Margin="2" Width="14" Height="14" Source="{Binding Path=ImageUrl}" HorizontalAlignment="Right" VerticalAlignment="Center" ></Image>
                            <TextBlock  Margin="2" Text="{Binding Path=Name}"  Width="{Binding Path=SizeOfName}" VerticalAlignment="Center"  />
                            <TextBlock Name="lb_params" Text="{Binding Params}" Width="{Binding Path=SizeParams}" VerticalAlignment="Center" TextAlignment="Center"/>

                        </StackPanel>
                    </HierarchicalDataTemplate>
                </TreeView.ItemTemplate>
            </TreeView>

我有两个树视图我想在treeview中拖一，然后在wpf中拖曳treeview拖曳？

Answer 1

要在TreeView控件中启用拖放功能：

设置TreeView两个控件的属性AllowDrop =“ True”。

在TreeView控件中声明三个事件，即“ MouseDown”，“ MouseMove”， “ DragOver”和“ Drop”事件。

<treeview.itemcontainerstyle>
   <style targettype="{x:Type TreeViewItem}">
     <EventSetter Event="TreeViewItem.DragOver"  Handler="treeView_DragOver"/>
     <EventSetter Event="TreeViewItem.Drop" Handler="treeView_Drop"/>
     <EventSetter Event="TreeViewItem.MouseMove" Handler="treeView_MouseMove"/> 
     <EventSetter Event="TreeViewItem.MouseDown" Handler="treeView_MouseDown"/>
  </style> 
</treeview.itemcontainerstyle>

并为xaml.cs文件中的所有事件定义事件处理程序

删除代码可能会对您有所帮助。

  private void treeView_MouseMove(object sender, MouseEventArgs e)
  {
       try
       { 
          e.Effects = DragDropEffects.None;
  e.Handled = true;
  TreeViewItem TargetItem = GetNearestContainer
      (e.OriginalSource as UIElement);
  if (TargetItem != null && draggedItem != null )
  {
      _target = TargetItem;
      e.Effects = DragDropEffects.Move;
  } } catch (Exception) { }}

如何在wpf中创建拖放？

1 个答案: