questionscreen.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 javax.microedition.lcdui.Form;

import fildiv.jremcntl.client.core.AppConstants;
import fildiv.jremcntl.client.core.AppContext;
import fildiv.jremcntl.client.core.QuestionListener;
import fildiv.jremcntl.client.util.UIUtils;

public class QuestionScreen extends AbstractScreen implements CommandListener {

	public static final short QS_NO = 0;
	public static final short QS_YES = 1;
	
	private final static Command CMD_YES =
		new Command("Yes", Command.OK, 1);
	private final static Command CMD_NO =
		new Command("No", Command.EXIT, 1);

	private Form questionForm;
	private short response;
	private String question;
	private QuestionListener questionListener;

	public QuestionScreen(AppContext appCtx, Screen backTo) {
		this(appCtx, backTo, "");
	}
	
	public QuestionScreen(AppContext appCtx, Screen backTo, 
			String question) {
		super(appCtx, backTo);
	
		questionForm = new Form(AppConstants.QUESTION_SCREEN_CAPTION);
		questionForm.addCommand(CMD_YES);
		questionForm.setCommandListener(this);
		questionForm.addCommand(CMD_NO);
	}

	
	public void setQuestion(String question) {
		this.question = question;
	}
	
	public String getQuestion() {
		return question;
	}
	
	protected void onActivate() {
		super.onActivate();
		
		questionForm.deleteAll();
		UIUtils.appendText(questionForm, question);
		
		getAppCtx().getDisplay().setCurrent(questionForm);
	}

	public short getResponse() {
		return response;
	}
	
	public void commandAction(Command c, Displayable arg1) {
		
		if (c == CMD_YES)
			response = QS_YES;
		else 
			response = QS_NO;

		questionListener.reponse(response);

		hide();
	}	
	
	public void show() {
		throw new IllegalArgumentException(
				"Use show(QuestionListener)!");
	}
	
	public void show(QuestionListener questionListener) {
		if (questionListener == null)
			throw new IllegalArgumentException();
		
		this.questionListener = questionListener;
		super.show();
	}
}