| /******************************************************************************* |
| * Copyright (c) 2011, 2016 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<>(); |
| 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 = 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(currTouch.x, 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 = 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 (); |
| } |
| } |