bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/gestures/Capture.java

/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.internal.gestures;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.widgets.Control;

public final class Capture {

	private List captureListeners;
	private boolean capturing;
	private Control control;
	private int data;

	private MouseListener mouseListener = new MouseListener() {
		public void mouseDoubleClick(MouseEvent mouseEvent) {
		}

		public void mouseDown(MouseEvent mouseEvent) {
			if (!capturing) {
				capturing = true;
				data = mouseEvent.stateMask;
				pen = mouseEvent.button;
				points.clear();
				points.add(new Point(mouseEvent.x, mouseEvent.y));
				control.addMouseMoveListener(mouseMoveListener);
			}
		}

		public void mouseUp(MouseEvent mouseEvent) {
			if (capturing && mouseEvent.button == pen) {
				control.removeMouseMoveListener(mouseMoveListener);
				points.add(new Point(mouseEvent.x, mouseEvent.y));
				CaptureEvent captureEvent =
					CaptureEvent.create(
						data,
						pen,
						(Point[]) points.toArray(new Point[points.size()]));
				capturing = false;
				data = 0;
				pen = 0;
				points.clear();
				Iterator iterator = captureListeners.iterator();

				while (iterator.hasNext())
					((ICaptureListener) iterator.next()).capture(captureEvent);
			}
		}
	};

	private MouseMoveListener mouseMoveListener = new MouseMoveListener() {
		public void mouseMove(MouseEvent mouseEvent) {
			if (capturing)
				points.add(new Point(mouseEvent.x, mouseEvent.y));
		}
	};
	private int pen;
	private List points = new ArrayList();

	public Capture() {
	}

	public void addCaptureListener(ICaptureListener captureListener) {
		if (captureListener == null)
			throw new NullPointerException();

		if (captureListeners == null)
			captureListeners = new ArrayList();

		if (!captureListeners.contains(captureListener))
			captureListeners.add(captureListener);
	}

	public Control getControl() {
		return control;
	}

	public void removeCaptureListener(ICaptureListener captureListener) {
		if (captureListener == null)
			throw new NullPointerException();

		if (captureListeners != null)
			captureListeners.remove(captureListener);
	}

	public void setControl(Control control) {
		if (this.control != control) {
			if (this.control != null) {
				control.removeMouseMoveListener(mouseMoveListener);
				control.removeMouseListener(mouseListener);
			}

			this.control = control;
			capturing = false;
			data = 0;
			pen = 0;
			points.clear();

			if (this.control != null)
				control.addMouseListener(mouseListener);
		}
	}
}