Java tutorial
/******************************************************************************* * 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 *******************************************************************************/ /* * Control example snippet: a dynamic gradient * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ * * @since 3.2 */ import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; public class GradientDynamic { static Image oldImage; public static void main(String[] args) { final Display display = new Display(); final Shell shell = new Shell(display); shell.setBackgroundMode(SWT.INHERIT_DEFAULT); shell.addListener(SWT.Resize, new Listener() { public void handleEvent(Event event) { Rectangle rect = shell.getClientArea(); Image newImage = new Image(display, Math.max(1, rect.width), 1); GC gc = new GC(newImage); gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE)); gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE)); gc.fillGradientRectangle(rect.x, rect.y, rect.width, 1, false); gc.dispose(); shell.setBackgroundImage(newImage); if (oldImage != null) { oldImage.dispose(); } oldImage = newImage; } }); shell.pack(); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } if (oldImage != null) oldImage.dispose(); display.dispose(); } }