listcommandscreen.java

一个基于J2ME技术的程序,使你可以远程控制装有服务端的PC.

/*
 * JRemCntl - Copyright (C) 2007 Filippo Di Vattimo <[e-mail]>
 * See COPYING
 */

package fildiv.jremcntl.client.ui;

import java.util.Vector;

import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.Ticker;

import fildiv.jremcntl.client.core.AppContext;
import fildiv.jremcntl.common.core.Context;

public class ListCommandScreen extends CommandScreen 
	implements CommandListener {

	private Vector cmdsVector = null;
	private List cmdsList = null;
	private String tickerMessage = "";
	
	public ListCommandScreen(AppContext appCtx) {
		super(appCtx);
	}

	public void reset(boolean clearAll) {
		
		if (clearAll)
			clearAll();
	}
	
	private void clearAll() {
		
		synchronized(tickerMessage) {
			tickerMessage = "";
		}
	}

	private void initList() {

		if (cmdsList != null)
			return;
		
		Context ctx = getContext();
		if (ctx == null)
			return;
		
		Vector commands = ctx.getCommands();
		
		cmdsVector = new Vector(commands.size());
		String descs[] = new String[commands.size()];
		
		for (int index = 0; index < commands.size(); ++index) {
			
			fildiv.jremcntl.common.core.Command cmd = 
				(fildiv.jremcntl.common.core.Command) 
					commands.elementAt(index);
			
			cmdsVector.addElement(cmd);
			descs[index] = buildCmdLabel(cmd);
		}
				
		cmdsList = new List(ctx.getDesc(), 
				Choice.IMPLICIT, descs, null);
				
		cmdsList.addCommand(CMD_BACK);
		
		cmdsList.setCommandListener(this);
		
		addCommands(cmdsList);
	}	

	private synchronized void execCommand() {
		
		int index = cmdsList.getSelectedIndex();
		fildiv.jremcntl.common.core.Command cmd = 
			(fildiv.jremcntl.common.core.Command)
				cmdsVector.elementAt(index);
		cmdsList.setSelectedIndex(index, true);
	
		if (cmd != null)
			execCommand(cmd);
	}
	
	protected void onDeactivate() {
		super.onDeactivate();
		reset(false);
	}
	
	public void commandAction(Command c, Displayable d) {
		
		if (manageCommand(c, d))
			return;
		
		if (d == cmdsList) {
			
			if (c == List.SELECT_COMMAND) 
				execCommand();
		}
	}
	
	public void setContext(Context ctx) {
		
		super.setContext(ctx);
		cmdsList = null;
		clearAll();
	}

	protected void onActivate() {
		
		initList();
		getDisplay().setCurrent(cmdsList);

		cmdsList.setTicker(new Ticker(tickerMessage));
	}
	
	public synchronized void setTickerMessage(String tickerMessage) {
				
		this.tickerMessage = tickerMessage;
		
		if (cmdsList == null)
			return;
		
		cmdsList.setTicker(new Ticker(tickerMessage));
	}
}