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/*******************************************************************************
* Copyright (c) 2007, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.cocoa.*;
import org.eclipse.swt.widgets.*;
/**
* This class provides default implementations to display a source image
* when a drag is initiated from a <code>Tree</code>.
*
* <p>Classes that wish to provide their own source image for a <code>Tree</code> can
* extend <code>TreeDragSourceEffect</code> class and override the <code>TreeDragSourceEffect.dragStart</code>
* method and set the field <code>DragSourceEvent.image</code> with their own image.</p>
*
* Subclasses that override any methods of this class must call the corresponding
* <code>super</code> method to get the default drag under effect implementation.
*
* @see DragSourceEffect
* @see DragSourceEvent
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.3
*/
public class TreeDragSourceEffect extends DragSourceEffect {
Image dragSourceImage = null;
/**
* Creates a new <code>TreeDragSourceEffect</code> to handle drag effect
* from the specified <code>Tree</code>.
*
* @param tree the <code>Tree</code> that the user clicks on to initiate the drag
*/
public TreeDragSourceEffect(Tree tree) {
super(tree);
}
/**
* This implementation of <code>dragFinished</code> disposes the image
* that was created in <code>TreeDragSourceEffect.dragStart</code>.
*
* Subclasses that override this method should call <code>super.dragFinished(event)</code>
* to dispose the image in the default implementation.
*
* @param event the information associated with the drag finished event
*/
public void dragFinished(DragSourceEvent event) {
if (dragSourceImage != null) dragSourceImage.dispose();
dragSourceImage = null;
}
/**
* 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
*/
public void dragStart(DragSourceEvent event) {
event.image = getDragSourceImage(event);
}
Image getDragSourceImage(DragSourceEvent event) {
if (dragSourceImage != null) dragSourceImage.dispose();
dragSourceImage = null;
NSPoint point = new NSPoint();
int /*long*/ ptr = OS.malloc(NSPoint.sizeof);
OS.memmove(ptr, point, NSPoint.sizeof);
NSEvent nsEvent = NSApplication.sharedApplication().currentEvent();
NSTableView widget = (NSTableView)control.view;
NSImage nsImage = widget.dragImageForRowsWithIndexes(widget.selectedRowIndexes(), widget.tableColumns(), nsEvent, ptr);
OS.memmove(point, ptr, NSPoint.sizeof);
OS.free(ptr);
//TODO: Image representation wrong???
Image image = Image.cocoa_new(control.getDisplay(), SWT.BITMAP, nsImage);
dragSourceImage = image;
nsImage.retain();
event.offsetX = (int)point.x;
event.offsetY = (int)point.y;
return image;
}
}
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