/**
//文檔生成日期：2006.3.28
//
//(1)概述：
//類名稱：FormPlayer
//類說明：
// 顯示播放音樂的Form界面
    
//所在子系統(tǒng)：StreamingDemo
//
//系統(tǒng)總描述:
	用兩個(gè)Player交替播放從網(wǎng)絡(luò)上下載的流媒體。

	上面的代碼可以從
	http://www.cnblogs.com/Files/zhengyun_ustc/StreamingDemo.rar
	下載；
	
	安裝的jar包從
	http://www.cnblogs.com/Files/zhengyun_ustc/StreamingDemo-deployed.rar下載。
	
	本文屬于討論稿，提供的僅僅是建議和測試意見。
	本文還可以從
	http://www.cnblogs.com/zhengyun_ustc/archive/2006/3/28/StreamingDemo.html 得到最新稿。


//(2)歷史記錄:
//創(chuàng)建人: 鄭昀(2006.3.28)
//修改歷史：


//聯(lián)系我: Google Talk >> zhengyun@gmail.com
//Blogs:    http://blog.csdn.net/zhengyun_ustc/以及http://www.cnblogs.com/zhengyun_ustc

//(3)版權(quán)聲明:
//我這個(gè)版本j2me客戶端代碼僅僅允許您借鑒，但不得用于商業(yè)用途，除非得到鄭昀本人的授權(quán)。本人保留所有權(quán)利。

////////////////////////////////////////////////////////////////////*/
package com.ultrapower.view;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
import javax.microedition.media.PlayerListener;

import com.ultrapower.common.CommandResources;
import com.ultrapower.control.GUIController;
import com.ultrapower.model.Audio;
import com.ultrapower.model.NonInteractiveGaugeRunnable;
import com.ultrapower.model.ThreadPlayMain;


/**********************************************************
//FormPlayer
//
//Author:
//zhengyun@ultrapower 2006.3.28
//
**********************************************************/
public class FormPlayer extends Form implements PlayerListener{
    private GUIController m_controller;
	
	/*
	 * 命令們
	 */
	private Command exitCommand; // The exit command
	private Command playCommand;
	
	/*
	 * 線程們
	 */
	public ThreadPlayMain m_threadMain;
	public ThreadPlayMain m_threadSecondary;
	
	/*
	 * 確定當(dāng)前在播放哪一個(gè)Palyer
	 */
	private int m_nCurrentSequence = 0;
	
	/*
	 * 界面元素們
	 */
	private int m_nAppendGaugeId = -1;
	private NonInteractiveGaugeRunnable m_nonInteractive;
	
    
	public FormPlayer(String title, GUIController control){
		super(title);
		
		System.out.println("/** Enter FormPlayer Constructor!");
		
		m_controller	=	control;
    	this.setCommandListener(new FormListener());
    	
		exitCommand = new Command("退出應(yīng)用(Exit)", Command.SCREEN, 4); 
		playCommand = new Command("重來一遍(Again)", Command.SCREEN, 2);
		this.addCommand(exitCommand); 
		this.addCommand(playCommand);

		// 同時(shí)顯示進(jìn)度條
		startGauge();
		
		// 創(chuàng)建兩個(gè)線程；一個(gè)負(fù)責(zé)主播放器，一個(gè)負(fù)責(zé)從播放器
		StartPlayMain();
		StartPlaySecondary();
		
		try
		{
			// 首先啟動(dòng)Main Player去下載音樂和預(yù)加載音樂
			m_threadMain.notifyGetMusic();
			m_threadMain.notifyPrefetch();
			m_threadMain.notifyPlay();
			// 剩下的事情就靠GUIController的消息機(jī)制了
		}
		catch(Exception exc)
		{
			////////////////////////////////////////////
			// 告訴控制器出錯(cuò)了
			String strError = exc.getMessage() + "/" + exc.getClass();
			Object[] argvErrors = {strError};
			m_controller.handleEvent(GUIController.EventID.EVENT_FORM_ERROR, 
					argvErrors);
			////////////////////////////////////////////
		}
	}

	
	/*
	 * 啟動(dòng)Main音樂播放線程
	 */
	public final void StartPlayMain()
    {
		try
		{
			// 第三個(gè)參數(shù)0代表主播放器
			m_threadMain = new ThreadPlayMain(m_controller, this,
					0,
					CommandResources.SND_MAIN_MIN,
					CommandResources.SND_MAIN_MAX);
		    Thread thread;
		    (thread = new Thread(m_threadMain)).start();
		}
		catch(Exception exc)
		{
			////////////////////////////////////////////
			// 告訴控制器出錯(cuò)了
			String strError = exc.getMessage() + "/" + exc.getClass();
			Object[] argvErrors = {strError};
			m_controller.handleEvent(GUIController.EventID.EVENT_FORM_ERROR, 
					argvErrors);
			////////////////////////////////////////////
		}
    }	
	/*
	 * 啟動(dòng)Secondary音樂播放線程
	 */
	public final void StartPlaySecondary()
    {
		// 第三個(gè)參數(shù)1代表Secondary播放器
		m_threadSecondary = new ThreadPlayMain(m_controller, this,
				1,
				CommandResources.SND_SECONDARY_MIN,
				CommandResources.SND_SECONDARY_MAX);
	    Thread thread;
	    (thread = new Thread(m_threadSecondary)).start();
    }
	
	/*
	 * playSecondary函數(shù)總是由playerUpdate事件觸發(fā)的；
	 * 當(dāng)Main Player的音樂播放完畢，那么就立即播放Secondary Player的。
	 */
	public final void playSecondary()
    {
		m_threadMain.setPlaying(false);
		m_nCurrentSequence = 1;
		System.out.println("**play Secondary player!");
		m_threadSecondary.notifyPlay();
		
		try
		{
			m_controller.handleEvent(GUIController.EventID.EVENT_SECONDARY_BeginToPlay, 
					null);
		}
		catch(Exception e){
			e.printStackTrace();
		}
    }
	
	/*
	 * playMain函數(shù)總是由playerUpdate事件觸發(fā)的；
	 * 當(dāng)Secondary Player的音樂播放完畢，那么就立即播放Main Player的。
	 */
	public final void playMain()
    {
		m_threadSecondary.setPlaying(false);
		m_nCurrentSequence = 0;
		System.out.println("##play Main Player!");
		m_threadMain.notifyPlay();
		
		try
		{
			m_threadSecondary.notifyGetMusic();
			m_threadSecondary.notifyPrefetch();
		}
		catch(Exception e){
			e.printStackTrace();
		}
    }

	
	/*
	 * 進(jìn)度條的函數(shù)
	 */
	public void startGauge()
	{
		if(m_nonInteractive == null)
		{
			System.out.println("new a NonInteractiveGaugeRunnable");
			m_nonInteractive = new NonInteractiveGaugeRunnable(
	                "I'm playing，please just wait...", 5, 0);
			new Thread(m_nonInteractive).start();
			m_nAppendGaugeId = this.append(m_nonInteractive);
		}
		else
		{
			System.out.println("active last NonInteractiveGaugeRunnable");
			m_nonInteractive.setValue(0);
			m_nonInteractive.setStart();
		}
	}	
	public void stopGauge()
	{
		if(m_nonInteractive != null)
			m_nonInteractive.setDone();
	}
	
	/*
	 * 通知Main音效和Secondary音效線程退出，之前要銷毀音樂資源
	 */
	public void destroyMusic() throws MediaException
	{
		Audio.shutdown();
		m_threadMain.notifyCloseThread();
		m_threadSecondary.notifyCloseThread();
	}
	
	/*
	 * 本類實(shí)現(xiàn)了PlayerListener接口。通過這個(gè)事件來告知媒體已經(jīng)播放完畢
	 */
	public void playerUpdate(Player player, String event, Object data){
		System.out.println("Enter playerUpdate>>" +
				event);
		
		if(event == PlayerListener.END_OF_MEDIA){
			try{
				System.out.println("playerUpdate>>PlayerListener.END_OF_MEDIA");
				stopGauge();
				
				if(m_nCurrentSequence == 0)
				{
					playSecondary();
				}
				else
				{
					playMain();
				}
				
				startGauge();				
			}catch(Exception e){
				e.printStackTrace();
			}
		}
		else if(event == PlayerListener.STOPPED)
		{
			System.out.println("playerUpdate>>PlayerListener.STOPPED");
		}
		else if(event == PlayerListener.STARTED)
		{
			System.out.println("playerUpdate>>PlayerListener.STARTED");
		}
	}

    /*
     * 內(nèi)部監(jiān)聽器，監(jiān)聽器監(jiān)聽所有Command事件，并把事件響應(yīng)推出來讓控制器處理
     */
    private class FormListener implements CommandListener{ 
		public void commandAction(Command command, Displayable disp){
			if(command == exitCommand)
			{
				////////////////////////////////////////////
				// 告訴控制器exit
				m_controller.handleEvent(GUIController.EventID.EVENT_EXIT, 
						null);
				////////////////////////////////////////////
			}
			else if(command == playCommand)
			{
				// 通知背景音樂重新播放,不過可能需要稍等一會(huì)兒
				m_threadMain.notifyPlay();
				// 通知進(jìn)度條繼續(xù)跑
				startGauge();
			}
		}
    }//end inner class
    
}