| /******************************************************************************* |
| * Copyright (c) 2000, 2005 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; |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * Region snippet: Create non-rectangular shell from an image with transparency |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| * |
| * @since 3.2 |
| */ |
| public class Snippet219 { |
| public static void main(String[] args) { |
| final Display display = new Display (); |
| final Image image = display.getSystemImage(SWT.ICON_INFORMATION); |
| final Shell shell = new Shell (display, SWT.NO_TRIM); |
| Region region = new Region(); |
| final ImageData imageData = image.getImageData(); |
| if (imageData.alphaData != null) { |
| Rectangle pixel = new Rectangle(0, 0, 1, 1); |
| for (int y = 0; y < imageData.height; y++) { |
| for (int x = 0; x < imageData.width; x++) { |
| if (imageData.getAlpha(x, y) == 255) { |
| pixel.x = imageData.x + x; |
| pixel.y = imageData.y + y; |
| region.add(pixel); |
| } |
| } |
| } |
| } else { |
| ImageData mask = imageData.getTransparencyMask(); |
| Rectangle pixel = new Rectangle(0, 0, 1, 1); |
| for (int y = 0; y < mask.height; y++) { |
| for (int x = 0; x < mask.width; x++) { |
| if (mask.getPixel(x, y) != 0) { |
| pixel.x = imageData.x + x; |
| pixel.y = imageData.y + y; |
| region.add(pixel); |
| } |
| } |
| } |
| } |
| shell.setRegion(region); |
| |
| Listener l = new Listener() { |
| int startX, startY; |
| public void handleEvent(Event e) { |
| if (e.type == SWT.KeyDown && e.character == SWT.ESC) { |
| shell.dispose(); |
| } |
| if (e.type == SWT.MouseDown && e.button == 1) { |
| startX = e.x; |
| startY = e.y; |
| } |
| if (e.type == SWT.MouseMove && (e.stateMask & SWT.BUTTON1) != 0) { |
| Point p = shell.toDisplay(e.x, e.y); |
| p.x -= startX; |
| p.y -= startY; |
| shell.setLocation(p); |
| } |
| if (e.type == SWT.Paint) { |
| e.gc.drawImage(image, imageData.x, imageData.y); |
| } |
| } |
| }; |
| shell.addListener(SWT.KeyDown, l); |
| shell.addListener(SWT.MouseDown, l); |
| shell.addListener(SWT.MouseMove, l); |
| shell.addListener(SWT.Paint, l); |
| |
| shell.setSize(imageData.x + imageData.width, imageData.y + imageData.height); |
| shell.open (); |
| while (!shell.isDisposed ()) { |
| if (!display.readAndDispatch ()) display.sleep (); |
| } |
| region.dispose(); |
| image.dispose (); |
| display.dispose (); |
| } |
| } |