example7.java

Micro Window Toolkit(MWT)是一个用于开发J2ME用户界面(UI)的工具包。它具有友好

package example;

/*
 * MWT - Micro Window Toolkit
 * Copyright (C) 2007 Lucas Domanico - [e-mail]
 * 
 * Licensed under the terms of the GNU Lesser General Public License:
 * 		http://www.opensource.org/licenses/lgpl-license.php
 * 
 * For further information visit:
 * 		http://j2me-mwt.sourceforge.net/
 */

import java.util.Random;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

import mwt.Button;
import mwt.Component;
import mwt.EventListener;
import mwt.Label;
import mwt.Window;


// Dialogs
//
class Canvas7 extends Canvas implements Runnable, EventListener {
	Window win = new Window(20,20,100,100); // the main window -reference-
	boolean exit;	// setted to true to finish the application
	static final int ACTION_EXIT = 1;	// buttons' action ids
	static final int ACTION_CONFIRM = 2;
	static final int ACTION_PROGRESS = 3;
	static final int ACTION_CLOSEDIALOG = 4;
	
	// notify input
	protected void keyPressed(int keyCode)	{ win.setKeyState(keyCode,Window.KEYSTATE_PRESSED,true); }
	protected void keyReleased(int keyCode) { win.setKeyState(keyCode,Window.KEYSTATE_RELEASED,true); }
	
	// event listener implementation
	public void processEvent(int eventType, Component sender, Object[] args) {
		switch(eventType) {
			case EVENT_ACTION: // when a button is pressed an event action is triggered
				switch(((Button)sender).getActionType()) {
					case ACTION_CONFIRM:
						// display a confirm dialog
						final Window dialog = new Window(18,30,116,50);
						dialog.add(new Label(4,4,100,20,"Are you sure?"));
						dialog.add(new Button(40,20,30,20,"No",Canvas7.this,ACTION_CLOSEDIALOG));
						dialog.add(new Button(4,20,30,20,"Yes",Canvas7.this,ACTION_PROGRESS));
						dialog.setFocusFirst();
						win.dialogOpen(dialog);
						break;
					case ACTION_PROGRESS:
						// display a dialog with a "progress bar"
						final Window progress = new Window(10,24,100,50);
						progress.add(new Button(4,20,40,20,"Cancel",Canvas7.this,ACTION_CLOSEDIALOG));
						progress.add(new Label(4,4,100,20,"Progress:") {
							final long start = System.currentTimeMillis();
							boolean finished;
							protected void paint(Graphics g, Window window) {
								int perc = (int) ((System.currentTimeMillis()-start) / 100);
								if(perc >= 100) {
									if(!finished) {
										finished = true;
										((Button) progress.getChild(0)).setText("Ok");
									}
									setText("Progress: finished!");
								}
								else setText("Progress:" + ((System.currentTimeMillis()-start) / 100) + "%");
								super.paint(g, window);
							}
						});
						progress.setFocusFirst();
						win.getDialog().dialogOpen(progress);
						break;
					case ACTION_CLOSEDIALOG: win.dialogClose(); break;
					case ACTION_EXIT: exit = true; return;
				}
				break;
			default: break;
		}
	}
	
	Canvas7() {
		win.add(new Label(4,4,80,20,"Options"));
		win.add(new Button(4,24,60,20,"Erase data",this,ACTION_CONFIRM));	
		win.add(new Button(4,54,60,20,"Exit",this,ACTION_EXIT));
		win.setFocusFirst();
	}
	
	public void run() {
		while(!exit) { // main loop
			win.repeatKeys(true);
			repaint();
			serviceRepaints();
			try { Thread.sleep(1); }
			catch(Exception e) { e.printStackTrace(); }
		}
		Example7.instance.notifyDestroyed();
	}
	
	protected void paint(Graphics g) {
		g.setColor(0xFFFFFFFF);	// clear graphics
		g.fillRect(0,0,getWidth(),getHeight());
		
		Random r = new Random(); // paint the "background"
		for(int i=0; i<10 ;i++) {
			g.setColor(Math.abs(r.nextInt()));
			g.drawRect(Math.abs(r.nextInt())%128,Math.abs(r.nextInt())%128,Math.abs(r.nextInt())%128,Math.abs(r.nextInt())%128);
		}

		win.paint(g); // and paint the window...
	}
}


public class Example7 extends MIDlet {
	static MIDlet instance;
	protected void startApp() throws MIDletStateChangeException {
		instance = this;
		Canvas7 c = new Canvas7();
		Display.getDisplay(this).setCurrent(c);
		new Thread(c).start();
	}
	protected void pauseApp() { }
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException { }
}