snippet138.java

Eclipse JAVA开发软件中SWT各控件范例源码

/*******************************************************************************
 * Copyright (c) 2000, 2004 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;
 
/*
 * example snippet: set icons with different resolutions
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.0
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet138 {
	public static void main(String[] args) {
		Display display = new Display();
		
		Image small = new Image(display, 16, 16);
		GC gc = new GC(small);
		gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
		gc.fillArc(0, 0, 16, 16, 45, 270);
		gc.dispose();
		
		Image large = new Image(display, 32, 32);
		gc = new GC(large);
		gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
		gc.fillArc(0, 0, 32, 32, 45, 270);
		gc.dispose();
		
		/* Provide different resolutions for icons to get
		 * high quality rendering wherever the OS needs 
		 * large icons. For example, the ALT+TAB window 
		 * on certain systems uses a larger icon.
		 */
		Shell shell = new Shell(display);
		shell.setText("Small and Large icons");
		shell.setImages(new Image[] {small, large});

		/* No large icon: the OS will scale up the
		 * small icon when it needs a large one.
		 */
		Shell shell2 = new Shell(display);
		shell2.setText("Small icon");
		shell2.setImage(small);
		
		shell.open();
		shell2.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		small.dispose();
		large.dispose();
		display.dispose();
	}
}