TreeDragSourceEffect.dragStart

This implementation of <code>dragStart</code> will create a default image that will be used during the drag. The image should be disposed when the drag is completed in the <code>TreeDragSourceEffect.dragFinished</code> method.

Subclasses that override this method should call <code>super.dragStart(event)</code> to use the image from the default implementation.

@param event the information associated with the drag start event

class TreeDragSourceEffect
override
void
dragStart

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