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Normal Topic DragDrop in Treeview (Read 2424 times)
Lonnie Nunweiler
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DragDrop in Treeview
Feb 26th, 2018 at 9:12pm
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I am evaluating the Diagramming tools for winforms.  So far it looks very complete and easy to use.

However, I need to be able to drag and drop from a BufferedTreeView which is used in the DockControl sample for the directory display.

There does not seem to be a DragDropEnabled property.  What am I missing or is the control missing dragdrop?
  
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Slavcho
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Re: DragDrop in Treeview
Reply #1 - Feb 27th, 2018 at 6:56am
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There's a DiagramView.AllowDrop property inherited from base Control class, and also DragOver and DragDrop events. These are shown in WorkflowDesigner sample project. You can convert from drag-and-drop screen coordinates to diagram's MeasureUnit ones like this -

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// DragEventArgs gives us the screen coordinates of a point
// so convert them to the diagram logical coordinate system
Point clientPoint = view.PointToClient(new Point(e.X, e.Y));
PointF diagramPoint = view.ClientToDoc(clientPoint);


and then e.g. create new nodes at that location or look for existing ones there.

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Slavcho
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Re: DragDrop in Treeview
Reply #2 - Feb 27th, 2018 at 8:25am
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I see now the BufferedTreeView control you are referring to is a subclass of TreeView in our sample project. You can use standard drag-and-drop methods again to start dragging from it, e.g. handle MouseDown, call TreeNode node = tree.GetNodeAt(e.X, e.Y); to find element at mouse position and then tree.DoDragDrop(...) to initiate the operation. For example see http://www.java2s.com/Code/CSharp/GUI-Windows-Form/DraganddropTreeNode.htm

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Slavcho
  
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Lonnie Nunweiler
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Re: DragDrop in Treeview
Reply #3 - Mar 17th, 2018 at 5:46am
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I did finally purchase a license, and do not regret it at all.

I also discovered that the BufferedTreeView is only a simple subclass of the standard .net Treeview. I can easily get drag and drop going, but I really need Multiple Select, which I have code for, so no problem ..... unless you have another way to build an Explorer style Directory Tree. Grin
  
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Re: DragDrop in Treeview
Reply #4 - Mar 19th, 2018 at 9:40am
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Hi,

There's the Microsoft.VisualBasic.Compatibility.VB6.DirListBox included in .NET if you'll actually be displaying a directory tree. You could also build diagrams for directory trees, e.g. as in DirTree and TreeMap sample projects, or radial layout step in the demo Wink

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Slavcho
  
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