gauge.java

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/*
 * Fire (Flexible Interface Rendering Engine) is a set of graphics widgets for creating GUIs for j2me applications. 
 * Copyright (C) 2006-2008 Bluevibe (www.bluevibe.net)
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 */

/**
 * 
 */
package gr.fire.ui;

import gr.fire.core.Animation;
import gr.fire.core.Component;
import gr.fire.core.FireScreen;

import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;

/**
 * @author padeler
 *
 */
public class Gauge extends Animation
{
	public static final long MILISECONDS_PER_FRAME=500;
	private static final int MAX_DOTS=4;
	
	private Component owner;
	private int dots=0;
	private String str;
	private boolean running=true;
	private Font font;
	private int color;
	private long lastFrame;

	public Gauge(String message,int x,int y)
	{
		Component c = new Component();
		font = FireScreen.getTheme().softKeyFont;
		c.setX(x);
		c.setY(y);
		c.setWidth(font.stringWidth(message));
		c.setHeight(font.getHeight());
		
		setup(c,null,message);
	}
	
	public void paint(Graphics g)
	{
		g.setFont(font);
		g.setColor(color);
		String s = str.substring(0,str.length()-(MAX_DOTS-1-dots));
		g.drawString(s,0,0,Graphics.TOP|Graphics.LEFT);
	}
	
	public void showGauge()
	{
		FireScreen screen = FireScreen.getScreen();
		screen.addComponent(owner);
		screen.registerAnimation(this);
	}
	
	public void hideGauge()
	{
		FireScreen screen = FireScreen.getScreen();
		screen.removeComponent(owner);
	}

	public Component getOwner()
	{
		return owner;
	}

	public Object getProperties()
	{
		return str;
	}

	public Component getTrigger()
	{
		return null;
	}

	public boolean isRunning()
	{
		return running;
	}

	public void setup(Component owner, Component trigger, Object properties)
	{
		if(!(properties instanceof String)) throw new IllegalArgumentException("Parameter is not a String");
		this.owner= owner;
		this.font  = FireScreen.getTheme().softKeyFont;
		this.color = FireScreen.getTheme().softKeyFgColor;
		this.str = (String)properties;
	}

	public boolean step()
	{
		long now = System.currentTimeMillis();
		
		if(now-lastFrame>=MILISECONDS_PER_FRAME)
		{
			lastFrame = now;
			dots++;
			dots = dots%MAX_DOTS;	
			return running;
		}
		return false;
	}

	public void stop()
	{
		running=false;
	}
}