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/*******************************************************************************
* Copyright (c) 2000, 2018 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
/**
* This class provides default implementations to display a source image
* when a drag is initiated from a Table
.
*
* Classes that wish to provide their own source image for a Table
can
* extend the TableDragSourceEffect
class, override the
* TableDragSourceEffect.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 source effect implementation.
*
* @see DragSourceEffect
* @see DragSourceEvent
* @see Sample code and further information
*
* @since 3.3
*/
public class TableDragSourceEffect extends DragSourceEffect {
Image dragSourceImage = null;
/**
* Creates a new TableDragSourceEffect
to handle drag effect
* from the specified Table
.
*
* @param table the Table
that the user clicks on to initiate the drag
*/
public TableDragSourceEffect(Table table) {
super(table);
}
/**
* This implementation of dragFinished
disposes the image
* that was created in TableDragSourceEffect.dragStart
.
*
* Subclasses that override this method should call super.dragFinished(event)
* to dispose the image in the default implementation.
*
* @param event the information associated with the drag finished event
*/
@Override
public void dragFinished(DragSourceEvent event) {
if (dragSourceImage != null) dragSourceImage.dispose();
dragSourceImage = null;
}
/**
* 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 TableDragSourceEffect.dragFinished
* method.
*
* Subclasses that override this method should call super.dragStart(event)
* to use the image from the default implementation.
*
* @param event the information associated with the drag start event
*/
@Override
public void dragStart(DragSourceEvent event) {
event.image = getDragSourceImage(event);
}
Image getDragSourceImage(DragSourceEvent event) {
if (dragSourceImage != null) dragSourceImage.dispose();
dragSourceImage = TreeTableCommon.getDragSourceImage(control);
return dragSourceImage;
}
}
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