Package org.eclipse.swt.dnd

Class TreeDragSourceEffect

java.lang.Object

org.eclipse.swt.dnd.DragSourceAdapter

org.eclipse.swt.dnd.DragSourceEffect

org.eclipse.swt.dnd.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:

• DragSourceEffect
• DragSourceEvent
• Sample code and further information

Constructor Summary

Constructors

Constructor	Description
TreeDragSourceEffect(Tree tree)	Creates a new TreeDragSourceEffect to handle drag effect from the specified Tree.

Method Summary

Modifier and Type	Method	Description
void	dragFinished(DragSourceEvent event)	This implementation of dragFinished disposes the image that was created in TreeDragSourceEffect.dragStart.
void	dragStart(DragSourceEvent event)	This implementation of dragStart will create a default image that will be used during the drag.

Methods inherited from class org.eclipse.swt.dnd.DragSourceEffect

getControl

Methods inherited from class org.eclipse.swt.dnd.DragSourceAdapter

dragSetData

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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:

• DragSourceEvent

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:

• DragSourceEvent