BasicScribbleView.java

/*******************************************************************************
 * Copyright (c) 2006 IBM, Inc and Composent, Inc. 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: Chris Aniszczyk <zx@us.ibm.com> - initial API and implementation
 ******************************************************************************/
package org.eclipse.ecf.tutorial.scribbleshare;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.ui.part.ViewPart;

public class BasicScribbleView extends ViewPart {

	private Display display;
	private Canvas canvas;
	
	public void createPartControl(Composite parent) {
		canvas = new Canvas(parent, SWT.NONE);
		display = parent.getDisplay();
		canvas.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
		Listener listener = new Listener () {
			int lastX = 0, lastY = 0;
			public void handleEvent (Event event) {
				switch (event.type) {
				case SWT.MouseMove:
					if ((event.stateMask & SWT.BUTTON1) == 0) break;
					GC gc = new GC(canvas);
					gc.drawLine(lastX, lastY, event.x, event.y);
					gc.dispose();
				case SWT.MouseDown:
					lastX = event.x;
					lastY = event.y;
					break;
				}
			}
		};
		canvas.addListener(SWT.MouseDown, listener);
		canvas.addListener(SWT.MouseMove, listener);
	}

	public void setFocus() {
		canvas.setFocus();
	}

}