Class TreeDragSourceEffect

All Implemented Interfaces:
EventListener, DragSourceListener, SWTEventListener

public class TreeDragSourceEffect extends DragSourceEffect
This class provides default implementations to display a source image when a drag is initiated from a Tree.

Classes that wish to provide their own source image for a Tree can extend TreeDragSourceEffect class and override the TreeDragSourceEffect.dragStart method and set the field DragSourceEvent.image with their own image.

Subclasses that override any methods of this class must call the corresponding super method to get the default drag under effect implementation.
Since:
3.3
See Also:
  • Constructor Details

    • TreeDragSourceEffect

      public TreeDragSourceEffect(Tree tree)
      Creates a new TreeDragSourceEffect to handle drag effect from the specified Tree.
      Parameters:
      tree - the Tree that the user clicks on to initiate the drag
  • Method Details

    • dragFinished

      public void dragFinished(DragSourceEvent event)
      This implementation of dragFinished disposes the image that was created in TreeDragSourceEffect.dragStart. Subclasses that override this method should call super.dragFinished(event) to dispose the image in the default implementation.
      Specified by:
      dragFinished in interface DragSourceListener
      Overrides:
      dragFinished in class DragSourceAdapter
      Parameters:
      event - the information associated with the drag finished event
      See Also:
    • dragStart

      public void dragStart(DragSourceEvent event)
      This implementation of dragStart will create a default image that will be used during the drag. The image should be disposed when the drag is completed in the TreeDragSourceEffect.dragFinished method. Subclasses that override this method should call super.dragStart(event) to use the image from the default implementation.
      Specified by:
      dragStart in interface DragSourceListener
      Overrides:
      dragStart in class DragSourceAdapter
      Parameters:
      event - the information associated with the drag start event
      See Also: