我希望 Headers 不会太混乱，不完全确定如何描述它 . 无论如何！
我有一个hierarchyDataTemplates的树视图，如下所示;
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type WPFFM:AssetCategoryViewModel}" ItemsSource="{Binding Path= Children}" >
<StackPanel Orientation="Horizontal" AllowDrop="True" Drop="StackPanel_Drop" DragEnter="StackPanel_DragEnter">
<TextBlock Text= "{Binding Description}" ContextMenu="{StaticResource assetOverviewContextMenu}"/>
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type WPFFM:AssetViewModel}" ItemsSource="{Binding Children}" >
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" HorizontalAlignment="Stretch" ContextMenu="{StaticResource assetContextMenu}"
PreviewMouseLeftButtonDown="Asset_PreviewMouseLeftButtonDown" PreviewMouseMove="Asset_PreviewMouseMove" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.Resources>
我已经在类别 Headers 上将AllowDrop设置为true，并且我已经设置了一些处理以在两者之间拖动资产 . 这是我的拖拽代码;
private void Asset_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
startPoint = e.GetPosition(null);
}
private void Asset_PreviewMouseMove(object sender, MouseEventArgs e)
{
// Get the current mouse position
Point mousePos = e.GetPosition(null);
Vector diff = startPoint - mousePos;
if (e.LeftButton == MouseButtonState.Pressed &&
Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance)
{
TextBlock parentMenu = sender as TextBlock;
AssetViewModel assetViewModelToSend = ((AssetViewModel)parentMenu.DataContext);
// Initialize the drag & drop operation
DataObject dragData = new DataObject("myFormat", assetViewModelToSend);
DragDrop.DoDragDrop(parentMenu, dragData, DragDropEffects.Move);
}
}
下降;
private void StackPanel_Drop(object sender, DragEventArgs e)
{
//TextBlock parentMenu = e as TextBlock;
//AssetCategoryViewModel assetCat = ((AssetCategoryViewModel)parentMenu.DataContext);
//MessageBox.Show(parentMenu.Text);
if (e.Data.GetDataPresent("myFormat"))
{
AssetViewModel modelBeingSent = e.Data.GetData("myFormat") as AssetViewModel;
MessageBox.Show(modelBeingSent.Description);
}
}
private void StackPanel_DragEnter(object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent("myFormat") ||
sender == e.Source)
{
e.Effects = DragDropEffects.None;
}
}
这工作正常，我可以从dragEventArgs获取我的viewmodel并拖动它们，但是我需要找到我正在拖动它的新类别viewmodel，但是你如何得到放置目标数据？它可能是发件人或args中的某些内容吗？
编辑：为清楚起见，这是我的观点图片 . 拖动源将是子（笔记本电脑），放置目标将是类别（硬件等） .
2 回答
在StackPanel_Drop方法中，e.OriginalSource对象应该是放置目标 . 您应该能够从中获得所需的信息 .
条件是：
AND为MouseButtonState.Pressed和OR为其他两个条件！