abstractscreen.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.Display;
import javax.microedition.lcdui.Form;

import fildiv.jremcntl.client.core.AppContext;
import fildiv.jremcntl.client.util.WaitGauge;
import fildiv.jremcntl.common.core.Logger;

public abstract class AbstractScreen implements Screen {
	
	private AppContext appCtx;
	private Logger log;
	private Screen backScreen;
	private int waitIndex = -1;
	private boolean active;

	private WaitGauge waitGauge = null;
	private Form gaugeForm;
	
	public AbstractScreen(AppContext appCtx) {
		this(appCtx, null);
	}

	public AbstractScreen(AppContext appCtx, Screen backScreen) {
		
		this.appCtx = appCtx;
		this.log = appCtx.getLogger();
		this.backScreen = backScreen;		
	}
	
	public AppContext getAppCtx() {
		return appCtx;
	}
	
	public Screen getBackScreen() {
		return backScreen;
	}
	
	public void setBackScreen(Screen backScreen) {
		this.backScreen = backScreen;
	}
	
	public Logger getLogger() {
		return log;
	}
	
	public void setLogger(Logger logger) {
		this.log = logger;
	}

	public Display getDisplay() {
		return appCtx.getDisplay();
	}
	
	public boolean isActive() {
		return active;
	}

	public void show() {
		setActive(true);	
	}

	public void hide() {
		hide(true);
	}

	public void hide(boolean showBack) {
		setActive(false);
		
		if (backScreen != null && showBack)
			backScreen.show();
	}
			
	private void setActive(boolean active) {

		this.active = active;

		if (this.active) {
			onActivate();
		} else {
			onDeactivate();			
		}
	}
	
	protected void onActivate() {
		
	}

	protected void onDeactivate() {
		
	}
	
	protected synchronized void showWait(Form f, String msg) {
		
		if (waitGauge != null)
			return;
		
		gaugeForm = f;
		
		waitGauge = new WaitGauge(msg, 10, 0);
		getDisplay().setCurrent(gaugeForm);		
		waitIndex = gaugeForm.append(waitGauge);
	}

	protected void stopWait() {
		
		if (waitGauge != null)
			waitGauge.setDone();
		
		if (waitIndex >= 0)
			gaugeForm.delete(waitIndex);
		
		waitGauge = null;
		gaugeForm = null;
		waitIndex = -1;
	}
		
	protected void showLogs() {

		Screen loggerScreen = (Screen) getLogger();
		loggerScreen.setBackScreen(this);
		loggerScreen.show();		
	}
	
	protected void log(String m) {
		
		if (log == null)
			return;
		
		log.info(m);
	}
	
	protected void logln(String m) {
		
		if (log == null)
			return;
		
		log.info(m);
	}
}