initializersplashscreen.java

j2me polish学习的经典代码

//#condition polish.midp

/*
 * Created on 23-Mar-2005 at 18:00:01.
 * 
 * Copyright (c) 2005 Robert Virkus / Enough Software
 *
 * This file is part of J2ME Polish.
 *
 * J2ME Polish is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * J2ME Polish is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with J2ME Polish; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Commercial licenses are also available, please
 * refer to the accompanying LICENSE.txt or visit
 * http://www.j2mepolish.org for details.
 */
// package de.enough.polish.ui.splash;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

//import de.enough.polish.ui.AccessibleCanvas;
//#if polish.usePolishGui
//import de.enough.polish.ui.Background;
//#endif
//import de.enough.polish.util.TextUtil;

/**
 * <p>Provides a SplashScreen that intialises the real application in a background thread.</p>
 *
 * <p>Copyright (c) 2005, 2006 Enough Software</p>
 * <pre>
 * history
 *        23-Mar-2005 - rob creation
 * </pre>
 * @author Robert Virkus, [e-mail]
 */
public class InitializerSplashScreen
//#ifdef polish.classes.fullscreen:defined
	//#= extends ${polish.classes.fullscreen}
//#else
	extends Canvas
//#endif
implements Runnable, AccessibleCanvas
{

	//#if polish.classes.ApplicationInitializer:defined
		//#= private final ${ classname( polish.classes.ApplicationInitializer) } initializer;
	//#else
		private final ApplicationInitializer initializer;
	//#endif
		
	private boolean isInitialized;
	private Displayable nextScreen;
	private final Display display;
	//#ifdef polish.classes.SplashView:defined
		//#= private final ${ classname( polish.classes.SplashView) } view;
	//#else
		private final Image image;
		private final String readyMessage;
		private final int messageColor;
		private final int backgroundColor;
	//#endif
	//#if false
		//# private final SplashView view;
	//#endif
	private String message;
	//#if polish.usePolishGui
		private Background background;
	//#endif
	private boolean isStarted;

	//#if !polish.classes.SplashView:defined
	/**
	 * Creates a new InitializerSplashScreen using the internal default view.
	 * The message will be shown in the default font.
	 * 
	 * @param display the display responsible for switching screens
	 * @param image the image that is shown in the center
	 * @param backgroundColor the background color, e.g. white: 0xFFFFFF
	 * @param readyMessage the message that is displayed when the application has been initialized
	 * @param messageColor the color for the message, e.g. black: 0
	 * @param initializer the application initializer that will be called in a background thread
	 */
	//#if polish.classes.ApplicationInitializer:defined
		//#= public InitializerSplashScreen( Display display, Image image, int backgroundColor, String readyMessage, int messageColor, ${ classname( polish.classes.ApplicationInitializer) } initializer )
	//#else
		public InitializerSplashScreen( Display display, Image image, int backgroundColor, String readyMessage, int messageColor, ApplicationInitializer initializer )
	//#endif
	{
		super();
		//#if polish.midp2 && !(polish.Bugs.fullScreenInShowNotify || polish.Bugs.fullScreenInPaint)
			super.setFullScreenMode( true );
		//#endif
		this.display = display;
		this.image = image;
		this.backgroundColor = backgroundColor;
		this.readyMessage = readyMessage;
		this.messageColor = messageColor;
		this.initializer = initializer;
		//#if false
			//# this.view = null;
		//#endif
	}
	//#endif
		
	//#ifdef polish.classes.SplashView:defined
		//#if polish.classes.ApplicationInitializer:defined
			//#= public InitializerSplashScreen( Display display, ${ classname( polish.classes.SplashView) } view, ${ classname( polish.classes.ApplicationInitializer) } initializer )
		//#else
			//#= public InitializerSplashScreen( Display display, ${ classname( polish.classes.SplashView) } view, ApplicationInitializer initializer )
		//#endif
		//#if false
			//# public InitializerSplashScreen( Display display, SplashView view, ApplicationInitializer initializer )
		//#endif
		//# {
			//#if polish.midp2 && !(polish.Bugs.fullScreenInShowNotify || polish.Bugs.fullScreenInPaint)
				//# super.setFullScreenMode( true );
			//#endif
			//# this.view = view;
			//# this.display = display;
			//# this.initializer = initializer;
			//#if false
				//# this.image = null;
				//# this.backgroundColor = 0;
				//# this.readyMessage = null;
				//# this.messageColor = 0;
			//#endif
//# 			
		//# }
	//#endif

	/**
	 * Sets a message that is displayed immediately.
	 * This call is ignored when a SplashView is used.
	 * 
	 * @param message the new message, null when no message should be shown.
	 */
	public void setMessage( String message ) {
		this.message = message;
		repaint();
	}
	
	
	
	/* (non-Javadoc)
	 * @see javax.microedition.lcdui.Canvas#paint(javax.microedition.lcdui.Graphics)
	 */
	public void paint(Graphics g) {
		//#if polish.Bugs.fullScreenInShowNotify || polish.Bugs.fullScreenInPaint
			//# super.setFullScreenMode(true);
		//#endif
		//#ifdef polish.FullCanvasSize:defined
			//#= int height = ${polish.FullCanvasHeight};
			//#= int width = ${polish.FullCanvasWidth};
		//#else
			int height = getHeight();
			int width = getWidth();
		//#endif
		//#ifdef polish.classes.SplashView:defined
			//# this.view.paint( width, height, this.isInitialized, g);
		//#else
			g.setColor( this.backgroundColor );
			g.fillRect( 0, 0, width, height );
			g.drawImage(this.image,  width/2, height/2, Graphics.HCENTER | Graphics.VCENTER );
			if (this.isInitialized) {
				g.setColor( this.messageColor );
				Font font = Font.getDefaultFont();
				String[] lines = TextUtil.wrap( this.readyMessage, font, width - 10, width - 10 );
				int y = height - ( lines.length * ( font.getHeight() + 1 ) );
				for (int i = 0; i < lines.length; i++) {
					String line = lines[i];
					g.drawString( line, width/2, y, Graphics.TOP | Graphics.HCENTER );
					y += font.getHeight() +  1;
				}
			} else if (this.message != null) {
				g.setColor( this.messageColor );
				Font font = Font.getDefaultFont();
				String[] lines = TextUtil.wrap( this.message, font, width - 10, width - 10 );
				int y = height - ( lines.length * ( font.getHeight() + 1 ) );
				for (int i = 0; i < lines.length; i++) {
					String line = lines[i];
					g.drawString( line, width/2, y, Graphics.TOP | Graphics.HCENTER );
					y += font.getHeight() +  1;
				}
			}
		//#endif
	}

	/* (non-Javadoc)
	 * @see java.lang.Runnable#run()
	 */
	public void run() {
		try {
			this.nextScreen = this.initializer.initApp();
			//#if !polish.classes.SplashView:defined
				if (this.readyMessage == null && this.nextScreen != null) {
					this.display.setCurrent( this.nextScreen );
					return;
				}
			//#endif
			this.isInitialized = true;
			repaint();
			if (this.nextScreen == null) {
				return;
			}
		} catch (Exception e) {
			//#debug error
			//# System.out.println("Unable to call initApp()" + e );
		}
	}
	
	

	public void keyPressed(int keyCode) {
		if (this.isInitialized && this.nextScreen != null ) {
			this.display.setCurrent( this.nextScreen );
		}
	}
	
	public void keyReleased(int keyCode) {
		// ignore
	}

	public void keyRepeated(int keyCode) {
		// ignore
	}
	
	//#ifdef polish.hasPointerEvents
	//# public void pointerPressed(int x, int y) {
		//# keyPressed( 0 );
	//# }
	//#endif
	
	//#if polish.midp2
	public void sizeChanged( int width, int height ) {
		// ignore
	}
	//#endif
	
	public void showNotify() {
		if (this.isStarted) {
			return;
		}
		this.isStarted = true;
		Thread thread = new Thread( this );
		thread.start();
	}
	
	public void hideNotify() {
		this.isStarted = false;
	}

	//#if polish.usePolishGui
	/**
	 * Retrieves the background.
	 * Warning: this method is only available when the J2ME Polish GUI is used, check for the polish.usePolishGui preprocessing symbol
	 * 
	 * @return the background
	 */
	public Background getBackground() {
		return this.background;
	}
	//#endif

	//#if polish.usePolishGui
	/**
	 * Sets the background of this splash screen.
	 * Warning: this method is only available when the J2ME Polish GUI is used, check for the polish.usePolishGui preprocessing symbol
	 * 
	 * @param background the background to set
	 */
	public void setBackground(Background background) {
		this.background = background;
	}
	//#endif

}