mainscreen.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.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;

import fildiv.jremcntl.client.Main;
import fildiv.jremcntl.client.core.AppContext;
import fildiv.jremcntl.client.core.JRemForm;
import fildiv.jremcntl.client.util.UIUtils;
import fildiv.jremcntl.common.core.Logger;

public class MainScreen extends AbstractScreen implements CommandListener {
			
	private static String INITIAL_MESSAGE = 
		"JRemote control";
	
	private final static Command CMD_EXIT =
        new Command("Exit", Command.EXIT, 1);

	private final static Command CMD_SCAN =
        new Command("Scan", Command.SCREEN, 2);
	
	private final static Command CMD_RECONNECT =
        new Command("Reconnect", Command.SCREEN, 2);

	private final static Command CMD_SAVE_PREFS =
        new Command("Save prefs", Command.SCREEN, 2);

	private static final Command CMD_SHOW_LOG = 
    	new Command("Logs", Command.SCREEN, 10);

	private static final Command CMD_HELP = 
    	new Command("Help", Command.SCREEN, 11);

	private static final Command CMD_ABOUT = 
    	new Command("About", Command.SCREEN, 11);

	private ConnectionScreen connScreen;
	private ControlPanelScreen cpScreen;
	private JRemForm mainForm;
	private HelpScreen helpScreen;
	private AboutScreen aboutScreen;

	private Main midlet;
		
	public MainScreen(AppContext appCtx, Main midlet) {
		super(appCtx, null);		
		
		this.midlet = midlet;

		connScreen = new ConnectionScreen(appCtx, this);
		cpScreen = new ControlPanelScreen(appCtx, this);
		aboutScreen = new AboutScreen(appCtx, this);
		helpScreen = new HelpScreen(appCtx, this);
		
		mainForm = new JRemForm("JRem Control");
		
		resetMainForm();
	}
	
	protected void resetMainForm() {
		
		clean();

		mainForm.addCommand(CMD_EXIT);
		mainForm.addCommand(CMD_ABOUT);
		mainForm.addCommand(CMD_HELP);
		
		if (!getAppCtx().getConnector().isBluetoothUp()) {
			logln("Bluetooth is not active.");
			UIUtils.appendText(mainForm, 
					"\nBluetooth is not active, " +
					"please enable it and try again.");			
			
		} else {
			
			String lastDeviceAddr = getAppCtx().getLastURL();
			
			if (lastDeviceAddr != null)
				mainForm.addCommand(CMD_RECONNECT);			

			mainForm.addCommand(CMD_SAVE_PREFS);			
			mainForm.addCommand(CMD_SCAN);
			mainForm.addCommand(CMD_SHOW_LOG);
		}		
	}

	private void clean() {

		String vers = getAppCtx().getVersion();
		
		mainForm.deleteAll();
		mainForm.setCommandListener(this);
		
		UIUtils.appendText(mainForm, "\n");
		UIUtils.appendText(mainForm, INITIAL_MESSAGE);
		UIUtils.appendText(mainForm, "\nVers. " + vers);
		
	}

	public void setLogger(Logger logger) {
		
		super.setLogger(logger);
		
		connScreen.setLogger(logger);
		cpScreen.setLogger(logger);		
	}
	
	public void commandAction(Command c, Displayable d) {
		
		if (c == CMD_EXIT)
			notifyExit();
		else if (c == CMD_SCAN)
			scan();
		else if (c == CMD_SHOW_LOG)
			showLogs();
		else if (c == CMD_RECONNECT) 
			reconnect();
		else if (c == CMD_SAVE_PREFS)
			savePrefs();
		else if (c == CMD_ABOUT)
			showAbout();
		else if (c == CMD_HELP) 
			showHelp();
	}

	private void showHelp() {
		helpScreen.show();
	}

	private void showAbout() {
		aboutScreen.show();
	}

	private void savePrefs() {

		getAppCtx().savePrefs();
		
		UIUtils.showAlert(getDisplay(), mainForm, 
				"Prefs saved.", AlertType.INFO);		
	}

	private void reconnect() {
		
		String url = getAppCtx().getLastURL();		

		if (url == null)
			scan();
		else
			connScreen.showAndConnect(url);
	}

	private void scan() {
		
		connScreen.show();
	}

	private void notifyExit() {
		hide();
		
		midlet.destroyApp();		
	}
	
	protected void onActivate() {

		resetMainForm();
		
		boolean isConnected = getAppCtx().isConnected();
		
		if (isConnected) {
			cpScreen.setConnector(getAppCtx().getConnector());
			cpScreen.show();
		} else
			getDisplay().setCurrent(mainForm);

	}
}