/*******************************************************************************
 * 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 Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.examples.controlexample;


import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

import java.text.*;
import java.util.*;

public class ControlExample {
	private static ResourceBundle resourceBundle =
		ResourceBundle.getBundle("examples_control");
	private ShellTab shellTab;
	private TabFolder tabFolder;
	Image images[];

	static final int ciClosedFolder = 0, ciOpenFolder = 1, ciTarget = 2;
	static final String[] imageLocations = {
		"closedFolder.gif",
		"openFolder.gif",
		"target.gif" };

	boolean startup = true;

	/**
	 * Creates an instance of a ControlExample embedded inside
	 * the supplied parent Composite.
	 * 
	 * @param parent the container of the example
	 */
	public ControlExample(Composite parent) {
		initResources();
		tabFolder = new TabFolder (parent, SWT.NONE);
		Tab [] tabs = createTabs();
		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));
		    item.setData (tabs [i]);
		}
		startup = false;
	}

	/**
	 * Answers the set of example Tabs
	 */
	Tab[] createTabs() {
		return new Tab [] {
			new ButtonTab (this),
			new CanvasTab (this),
			new ComboTab (this),
			new CoolBarTab (this),
			new DialogTab (this),
			new GroupTab (this),
			new LabelTab (this),
			new ListTab (this),
			new ProgressBarTab (this),
			new SashTab (this),
			shellTab = new ShellTab(this),
			new SliderTab (this),
			new TabFolderTab (this),
			new TableTab (this),
			new TextTab (this),
			new ToolBarTab (this),
			new TreeTab (this),
		};
	}

	/**
	 * Disposes of all resources associated with a particular
	 * instance of the ControlExample.
	 */	
	public void dispose() {
		/*
		 * Destroy any shells that may have been created
		 * by the Shells tab.  When a shell is disposed,
		 * all child shells are also disposed.  Therefore
		 * it is necessary to check for disposed shells
		 * in the shells list to avoid disposing a shell
		 * twice.
		 */
		if (shellTab != null) shellTab.closeAllShells ();
		shellTab = null;
		tabFolder = null;
		freeResources();
	}

	/**
	 * Frees the resources
	 */
	void freeResources() {
		if (images != null) {
			for (int i = 0; i < images.length; ++i) {
				final Image image = images[i];
				if (image != null) image.dispose();
			}
			images = null;
		}
	}
	
	/**
	 * 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 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(getResourceString(key), args);
		} catch (MissingResourceException e) {
			return key;
		} catch (NullPointerException e) {
			return "!" + key + "!";
		}
	}

	/**
	 * Loads the resources
	 */
	void initResources() {
		final Class clazz = ControlExample.class;
		if (resourceBundle != null) {
			try {
				if (images == null) {
					images = new Image[imageLocations.length];
					
					for (int i = 0; i < imageLocations.length; ++i) {
						ImageData source = new ImageData(clazz.getResourceAsStream(
							imageLocations[i]));
						ImageData mask = source.getTransparencyMask();
						images[i] = new Image(null, source, mask);
					}
				}
				return;
			} catch (Throwable t) {
			}
		}
		String error = (resourceBundle != null) ?
			getResourceString("error.CouldNotLoadResources") :
			"Unable to load resources";
		freeResources();
		throw new RuntimeException(error);
	}

	/**
	 * Invokes as a standalone program.
	 */
	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
		ControlExample instance = new ControlExample(shell);
		shell.setText(getResourceString("window.title"));
		setShellSize(display, shell);
		shell.open();
		while (! shell.isDisposed()) {
			if (! display.readAndDispatch()) display.sleep();
		}
		instance.dispose();
	}
	
	/**
	 * Grabs input focus.
	 */
	public void setFocus() {
		tabFolder.setFocus();
	}
	
	/**
	 * Sets the size of the shell to it's "packed" size,
	 * unless that makes it bigger than the display,
	 * in which case set it to 9/10 of display size.
	 */
	static void setShellSize (Display display, Shell shell) {
		Rectangle bounds = display.getBounds();
		Point size = shell.computeSize (SWT.DEFAULT, SWT.DEFAULT);
		if (size.x > bounds.width) size.x = bounds.width * 9 / 10;
		if (size.y > bounds.height) size.y = bounds.height * 9 / 10;
		shell.setSize (size);
	}
}