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POWPF - treeview - drag and drop and contextmenu issue
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  1. POWPF - treeview - drag and drop and contextmenu issue
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    copied!<p>I have a TreeView. I set a ContextMenu on the TreeViewItems. When I open the ContextMenu by rightclicking on an item and select another item (while the ContextMenu is open) I expect the just clicked item to get selected without doing anything. Instead the Framework thinks that I want to drag the item on which the ContextMenu was opened and therefor calls the Drop handler. How can I solve this problem. Thanks</p> <pre><code> private void TreeViewPreviewMouseMove(object sender, MouseEventArgs e) { if (e.LeftButton == MouseButtonState.Pressed &amp;&amp; !_isDragging) { var position = e.GetPosition(sender as IInputElement); if (Math.Abs(position.X - _startPoint.X) &gt; SystemParameters.MinimumHorizontalDragDistance || Math.Abs(position.Y - _startPoint.Y) &gt; SystemParameters.MinimumVerticalDragDistance) { StartDrag(); } } } private void TreeViewPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { _startPoint = e.GetPosition(sender as IInputElement); } private void TemplateTreeViewDrop(object sender, DragEventArgs e) { if (_isDragging &amp;&amp; (e.Source as TreeView) != null) { dragQuestion = e.Data.GetData(typeof(QuestionListItem)) as QuestionListItem; dropQuestion = GetItemAtLocation(e.GetPosition(TemplateTreeView)); if (dragQuestion != null &amp;&amp; dropQuestion != null &amp;&amp; dragQuestion!=dropQuestion) { viewModel.MoveQuestion(dragQuestion, dropQuestion); } } e.Handled = true; dragQuestion = null; } private void StartDrag() { var temp = TemplateTreeView.SelectedItem as QuestionListItem; if(temp == null) return; _isDragging = true; var data = new DataObject(temp); DragDrop.DoDragDrop(TemplateTreeView, data, DragDropEffects.Move); _isDragging = false; } </code></pre>
 

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