bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/common/org/eclipse/swt/dnd/DragSourceEvent.java

/*******************************************************************************
 * Copyright (c) 2000, 2011 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.events.TypedEvent;
import org.eclipse.swt.graphics.*;

/**
 * The DragSourceEvent contains the event information passed in the methods of the DragSourceListener.
 *
 * @see DragSourceListener
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 */
public class DragSourceEvent extends TypedEvent {
	/**
	 * The operation that was performed.
	 * @see DND#DROP_NONE
	 * @see DND#DROP_MOVE
	 * @see DND#DROP_COPY
	 * @see DND#DROP_LINK
	 * @see DND#DROP_TARGET_MOVE
	 */
 	public int detail;

 	/**
 	 * In dragStart, the doit field determines if the drag and drop operation
 	 * should proceed; in dragFinished, the doit field indicates whether
 	 * the operation was performed successfully.
 	 * <p></p>
 	 * In dragStart:
 	 * <p>Flag to determine if the drag and drop operation should proceed.
 	 * The application can set this value to false to prevent the drag from starting.
 	 * Set to true by default.</p>
 	 * <p>In dragSetData:</p>
 	 * <p>This will be set to true when the call to dragSetData is made.  Set it to
 	 * false to cancel the drag.</p>
 	 * <p>In dragFinished:</p>
 	 * <p>Flag to indicate if the operation was performed successfully.
 	 * True if the operation was performed successfully.</p>
 	 */
 	public boolean doit;

	/**
	 * In dragStart, the x coordinate (relative to the control) of the
	 * position the mouse went down to start the drag.
	 *
	 * @since 3.2
	 */
 	public int x;
 	/**
	 * In dragStart, the y coordinate (relative to the control) of the
	 * position the mouse went down to start the drag.
	 *
	 * @since 3.2
	 */
 	public int y;

 	/**
	 * The type of data requested.
	 * Data provided in the data field must be of the same type.
 	 */
	public TransferData dataType;

	/**
	 * The drag source image to be displayed during the drag.
	 * <p>A value of null indicates that no drag image will be displayed.</p>
	 * <p>The default value is null.</p>
	 *
	 * @since 3.3
	 */
	public Image image;

	/**
	 * In dragStart, the x offset (relative to the image) where the drag source image will be displayed.
	 *
	 * @since 3.5
	 */
 	public int offsetX;
	/**
	 * In dragStart, the y offset (relative to the image) where the drag source image will be displayed.
	 *
	 * @since 3.5
	 */
 	public int offsetY;

	static final long serialVersionUID = 3257002142513770808L;

/**
 * Constructs a new instance of this class based on the
 * information in the given untyped event.
 *
 * @param e the untyped event containing the information
 */
public DragSourceEvent(DNDEvent e) {
	super(e);
	this.data = e.data;
	this.detail = e.detail;
	this.doit = e.doit;
	this.dataType = e.dataType;
	this.x = e.x;
	this.y = e.y;
	this.image = e.image;
	this.offsetX = e.offsetX;
	this.offsetY = e.offsetY;
}
void updateEvent(DNDEvent e) {
	e.widget = this.widget;
	e.time = this.time;
	e.data = this.data;
	e.detail = this.detail;
	e.doit = this.doit;
	e.dataType = this.dataType;
	e.x = this.x;
	e.y = this.y;
	e.image = this.image;
	e.offsetX = this.offsetX;
	e.offsetY = this.offsetY;
}
/**
 * Returns a string containing a concise, human-readable
 * description of the receiver.
 *
 * @return a string representation of the event
 */
@Override
public String toString() {
	String string = super.toString ();
	return string.substring (0, string.length() - 1) // remove trailing '}'
		+ " operation=" + detail
		+ " type=" + (dataType != null ? dataType.type : 0)
		+ " doit=" + doit
		+ "}";
}
}