Fill in touch example snippet.

1 files changed, 86 insertions, 11 deletions

diff --git a/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet352.java b/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet352.java
index e393cfadd5..f76fc873f3 100644
--- a/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet352.java
+++ b/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet352.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2010 IBM Corporation and others.
+ * 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
@@ -10,24 +10,99 @@
  *******************************************************************************/
 package org.eclipse.swt.snippets;
 
-/*
- * Touch example
+/* 
+ * 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 = 20;
+	
+	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.setTouchEventsEnabled(true);
+		c.setSize(800, 800);
+		c.addTouchListener(tl);
+		c.addPaintListener(pl);
 
-	public static void main(String [] args) {
-		Display display = new Display();
-		Shell shell = new Shell(display);
-		while (!shell.isDisposed()) {
-			if (!display.readAndDispatch()) display.sleep();
+		shell.setSize (800, 800);
+		shell.open ();
+		while (!shell.isDisposed ()) {
+			if (!display.readAndDispatch ()) display.sleep ();
 		}
-		display.dispose();
+		display.dispose ();
 	}
 }
\ No newline at end of file