commandscreen.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 javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;

import fildiv.jremcntl.client.core.AppContext;
import fildiv.jremcntl.client.core.JRemClientProtocol;
import fildiv.jremcntl.client.core.QuestionListener;
import fildiv.jremcntl.common.core.Context;
import fildiv.jremcntl.common.util.JRemUtils;

public class CommandScreen extends AbstractScreen implements CommandListener {
	
	protected final static Command CMD_BACK =
		new Command("Back", Command.BACK, 1);
	protected final static Command CMD_SWITCH =
		new Command("Switch view", Command.SCREEN, 1);
	protected final static Command CMD_LOGS =
		new Command("Logs", Command.SCREEN, 2);

	private Context ctx = null;
	private QuestionScreen questionScreen;
	
	public CommandScreen(AppContext appCtx) {
		super(appCtx);
		questionScreen = new QuestionScreen(appCtx, this);
	}

	private JRemClientProtocol proto;
	
	protected synchronized void execCommand(
			final fildiv.jremcntl.common.core.Command cmd) {
								
		String question = cmd.getQuestion();
		if (question != null && question.length() > 0) {
		
			questionScreen.setQuestion(question);
			questionScreen.show(new QuestionListener() {
	
				public void reponse(short response) {
					if (response == QuestionScreen.QS_YES) {
						sendCommand(cmd);
					}
				}
			});
			
		} else {
			sendCommand(cmd);
		}
	}	
	
	protected void sendCommand(final fildiv.jremcntl.common.core.Command cmd) {
		try {
			proto.sendCommandID(cmd.getID());

		} catch(Exception e) {
			logln("Error occurred while execCommand : " + e.getMessage());
			
		} finally {
		}		
	}
	
	protected String buildCmdLabel(fildiv.jremcntl.common.core.Command cmd) {
		
		String label = "";
		
		if (cmd.getKey().length() > 0)
			label = "(" + cmd.getKey() + ") ";
		
		label+= cmd.getDesc();
		
		return label;
	}
		
	public void setProtocol(JRemClientProtocol proto) {
		this.proto = proto;	
	}	
	
	public Context getContext() {
		return ctx;
	}
	
	public void setContext(Context ctx) {
		this.ctx = ctx;
	}

	protected boolean manageCommand(Command c, Displayable d) {

		boolean managed = false;

		CommandPanelScreen cps = (CommandPanelScreen) getBackScreen();
		
		if (c == CMD_BACK) {
			hide(false);
			cps.hide();
			
			managed = true;
		} else if (c == CMD_SWITCH) {

			hide(false);	
			cps.swithView();
			
			managed = true;
		} else if (c == CMD_LOGS) {
			showLogs();
			managed = true;
		}
		
		return managed;
	}
	
	protected void addCommands(Displayable d) {
		d.addCommand(CMD_BACK);
		
		if (JRemUtils.hasKeysAssigned(ctx))
			d.addCommand(CMD_SWITCH);		
		
		d.addCommand(CMD_LOGS);
		
		d.setCommandListener(this);		
	}
	
	public void commandAction(Command c, Displayable d) {
		manageCommand(c, d);
	}
}