LayoutExample.java

/*******************************************************************************
 * 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.examples.layoutexample;

import java.text.MessageFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ShellAdapter;
import org.eclipse.swt.events.ShellEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TabFolder;
import org.eclipse.swt.widgets.TabItem;

public class LayoutExample {
	private static ResourceBundle	resourceBundle	= ResourceBundle.getBundle("examples_layout");

	/**
	 * Invokes as a standalone program.
	 */
	public static void main(String[] args) {
		final Display display = new Display();
		final Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
		new LayoutExample(shell);
		shell.setText(LayoutExample.getResourceString("window.title"));
		shell.addShellListener(new ShellAdapter() {
			public void shellClosed(ShellEvent e) {
				Shell[] shells = display.getShells();
				for (int i = 0; i < shells.length; i++)
					if (shells[i] != shell)
						shells[i].close();
			}
		});
		shell.open();
		while (!shell.isDisposed())
			if (!display.readAndDispatch())
				display.sleep();
	}

	/**
	 * Gets a string from the resource bundle. We don't want to crash because of a missing String. Returns the key if
	 * not found.
	 */
	static String getResourceString(String key) {
		try {
			return LayoutExample.resourceBundle.getString(key);
		} catch (MissingResourceException e) {
			return key;
		} catch (NullPointerException e) {
			return "!" + key + "!";
		}
	}

	/**
	 * Gets a string from the resource bundle and binds it with the given arguments. If the key is not found, return the
	 * key.
	 */
	static String getResourceString(String key, Object[] args) {
		try {
			return MessageFormat.format(LayoutExample.getResourceString(key), args);
		} catch (MissingResourceException e) {
			return key;
		} catch (NullPointerException e) {
			return "!" + key + "!";
		}
	}

	private TabFolder	tabFolder;

	/**
	 * Creates an instance of a LayoutExample embedded inside the supplied parent Composite.
	 * 
	 * @param parent
	 *            the container of the example
	 */
	public LayoutExample(Composite parent) {
		tabFolder = new TabFolder(parent, SWT.NONE);
		Tab[] tabs = new Tab[] { new FillLayoutTab(this), new RowLayoutTab(this), new GridLayoutTab(this),
				new FormLayoutTab(this), };
		for (int i = 0; i < tabs.length; i++) {
			TabItem item = new TabItem(tabFolder, SWT.NONE);
			item.setText(tabs[i].getTabText());
			item.setControl(tabs[i].createTabFolderPage(tabFolder));
		}
	}

	/**
	 * Disposes of all resources associated with a particular instance of the LayoutExample.
	 */
	public void dispose() {
		tabFolder = null;
	}

	/**
	 * Grabs input focus.
	 */
	public void setFocus() {
		tabFolder.setFocus();
	}
}