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/*******************************************************************************
* Copyright (c) 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.snippets;
/*
* Touch example: create a shell and listen for TouchEvents. Paint
* circles where the user touched.
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.7
*/
import java.util.*;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet352 {
private static class CircleInfo {
public CircleInfo(Point inCenter, Color inColor) {
this.center = inCenter;
this.color = inColor;
}
Point center;
Color color;
}
static Map<Long, CircleInfo> touchLocations = new HashMap<Long, CircleInfo>();
static int colorIndex = 0;
static final int PAINTABLE_COLORS = 15;
static final int CIRCLE_RADIUS = 40;
public static void main (String [] args) {
final Display display = new Display ();
final Shell shell = new Shell (display);
shell.setLayout(new FillLayout(SWT.HORIZONTAL));
shell.setText ("Touch demonstration");
TouchListener tl = new TouchListener() {
public void touch(TouchEvent e) {
Touch touches[] = e.touches;
for (int i = 0; i < touches.length; i++) {
Touch currTouch = touches[i];
if ((currTouch.state & (SWT.TOUCHSTATE_UP)) != 0) {
touchLocations.remove(currTouch.id);
} else {
CircleInfo info = touchLocations.get(currTouch.id);
Point newPoint = Display.getCurrent().map(null, (Control)e.widget, new Point((int)currTouch.x, (int)currTouch.y));
if (info == null) {
info = new CircleInfo(newPoint, display.getSystemColor((colorIndex + 2) % PAINTABLE_COLORS));
colorIndex++;
}
info.center = newPoint;
touchLocations.put(currTouch.id, info);
}
}
Control c = (Control)e.widget;
c.redraw();
}
};
PaintListener pl = new PaintListener() {
public void paintControl(PaintEvent e) {
Iterator<Map.Entry<Long, CircleInfo>> iter = touchLocations.entrySet().iterator();
while (iter.hasNext()) {
CircleInfo ci = iter.next().getValue();
e.gc.setBackground(ci.color);
e.gc.fillOval(ci.center.x - CIRCLE_RADIUS, ci.center.y - CIRCLE_RADIUS, CIRCLE_RADIUS * 2, CIRCLE_RADIUS * 2);
}
}
};
Canvas c = new Canvas(shell, SWT.NONE);
c.setTouchEnabled(true);
c.setSize(800, 800);
c.addTouchListener(tl);
c.addPaintListener(pl);
shell.setSize (800, 800);
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
}
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