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Can I change the cursor during DnD? [message #645571]

Fri, 17 December 2010 22:20

Eclipse User

I am dragging a Java IType from the Package Explorer to onto my diagram. Depending on the EditPart underneath, I would like show different cursors if dropping is possible. I have looked into various places that deal with cursors (AbstractTool, Control, EditPartViewer), but none of the cursor-related methods are executed when a drag is in progress. Is there any way to change the cursor?

Re: Can I change the cursor during DnD? [message #645594 is a reply to message #645571]

Sat, 18 December 2010 08:33

Eclipse User

Take a look at DragEditsPartTracker and its superclass SelectEditPartsTracker. They provide a means to "calculate" cursors during a drag operation.

Re: Can I change the cursor during DnD? [message #645598 is a reply to message #645594]

Sat, 18 December 2010 09:43

Eclipse User

SelectEditPartsTracker is a subclass of AbstractTool, which I already investigated. I put breakpoints into the calculateCursor() methods, but they are not executed when I drag something from the Package Explorer. The only thing I see executed is EditPolicy.getCommand(), and the cursor does change when null is returned. However, I failed to find any code that actually changes the cursor afterwards. I couldn't even find a reference to org.eclipse.swt.graphics.Cursor in the org.eclipse.swt.dnd package.

[Updated on: Sat, 18 December 2010 09:57] by Moderator

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