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Editorial Team
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Asked: 2026-05-15T08:57:53+00:00

I’m handling drag and drop events in a TreeView using PreviewMouseDown, PreviewMouseMove and PreviewMouseUp,

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I’m handling drag and drop events in a TreeView using PreviewMouseDown, PreviewMouseMove and PreviewMouseUp, however, there is an issue.

In my PreviewMouseDown handler, I set everything ready in case there’s a drag started (detected in the Move event), however I set e.Handled = true. This means that standard selection events don’t get generated on my tree!

What I want to be able to do in my Up event is to invoke the standard treeview selection changed event – except I cannot call events outside of the tree. So what’s the correct way to do this?

I have tried using the standard MouseDown, MouseMove and MouseUp events however there’s an issue with messing up my multiple selection feature that means I need to use the Preview version of those events.

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1 Answer

  1. Editorial Team

    My solution to this is to not use the Preview handlers, instead I use MouseDown, MouseMove and MouseUp.

    The sequence of events is:

    * MouseDown (set up for possible drag)
* SelectionChanged (remember any selection change)
* MouseMove (here we might go into a drag operation)
* MouseUp (if we went into a drag operation, all done, otherwise process the multiple selection stuff)
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