拖拽的实现
实现效果:左键自定义控件上的树节点,将信息拖拽到主窗体的文本框中
自定义控件: ----拖拽源
.cs中
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private void OnPreviewListBoxMouseMove(object sender, MouseEventArgs e) { Point pos = e.GetPosition(leftDataTree); //获取mListBox位置 HitTestResult result = VisualTreeHelper.HitTest(leftDataTree, pos); //获取mListBox信息 TreeViewItem listBoxItem = Utils.FindVisualParent<TreeViewItem>(result.VisualHit); //找到实际要拖拽的 if (listBoxItem == null || listBoxItem.DataContext != leftDataTree.SelectedItem || !(leftDataTree.SelectedItem is DataTreeModel)) return; if (((DataTreeModel)listBoxItem.DataContext).Parent == null) return; #region 复制效果 //DragDropAdorner adorner = new DragDropAdorner(listBoxItem); //mAdornerLayer = AdornerLayer.GetAdornerLayer(mTopLevelGrid); //mAdornerLayer.Add(adorner); #endregion DataTreeModel dataItem = listBoxItem.DataContext as DataTreeModel; DataObject dataObject = new DataObject(dataItem); System.Windows.DragDrop.DoDragDrop(leftDataTree, dataObject, DragDropEffects.Copy); //mAdornerLayer.Remove(adorner); //复制完后删除效果 }
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internal static class Utils { /// <summary> /// 复制 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="obj"></param> /// <returns></returns> public static T FindVisualParent<T>(DependencyObject obj) where T : class { while (obj != null) { if (obj is T) return obj as T; obj = VisualTreeHelper.GetParent(obj); } return null; } }
.xaml中
<TreeView Height="700" HorizontalAlignment="Left" x:Name="leftDataTree" VerticalAlignment="Top" Width="200" ItemsSource="{Binding DataTreeNode}" SelectedItemChanged="leftDataTree_SelectedItemChanged" >
主窗体: ----接收数据
.cs中
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private void OnDragOver(object sender, DragEventArgs e) { e.Handled = true; e.Effects = DragDropEffects.Copy; }
.xaml中
<TextBox Name="txtinfo" TextWrapping="Wrap" AllowDrop="True" PreviewDragOver="OnDragOver"/>
最后你会发现,其实拖拽源和接收数据是分开的,两个独立的功能块。用起来很爽。(但是有些第三方控件不支持拖拽,坑爹啊)