bluedumpgui.java

this a dump j2me source code

//------------------------------------------------------------------
//Copyright (c) 2004 Jyperion SARL
//					France
//  
//This software is provided "AS IS," without a warranty of any kind. 
//ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, 
//INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A 
//PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED.
//
//------------------------------------------------------------------
package example.bluetooth.dump;

import javax.microedition.lcdui.*;
import java.io.IOException;
import java.util.*;


/**
 * Be in  charge of the Graphic User Interface
 * This canvas will display all the messages from the Vector data structure 
 * 
 * @author Guillaume Compagnon
 *
 */
public class BlueDumpGUI extends Canvas {
	/** maximum number of messages lines to be displayed 
	 * in order not to overflow the memory with too much messages
	 */
	public static final int MAX_MESSAGES = 100;	
	
	public static final Integer RED = new Integer(0xFF0000);
	public static final Integer BLACK = new Integer(0x000000);
	public static final Integer BLUE = new Integer(0x0000FF);

	/** List of messages to be displayed */
	Vector messages;
	
	/** List of the color for each messages */
	Vector messagesColors;
	
	/** pointer to the first message that will be displayed, as the last should always be on the screen */
	int pointer = 0;
	/** 
	 * graphic width and height of the screen
	 */ 
	int width, height;
	/** font used to write on the screen */
	Font font;
	/** font height */
	int fontHeight;

	Image screen;
	Image connectImage;
	Image connectingImage;
	Image disconnectImage;

	private int iconWidth;
	private int iconHeight;

	int x0=0, y0=0;

	public BlueDumpGUI()
	{		
		width = getWidth();
		height = getHeight();

		font = Font.getFont(  Font.FACE_MONOSPACE, Font.STYLE_PLAIN, Font.SIZE_SMALL );
		fontHeight = font.getHeight();
		// Create off-screen image and paint it white.
		screen = Image.createImage(width , height);		
		messages = new Vector(MAX_MESSAGES*height / fontHeight);
		messagesColors = new Vector(MAX_MESSAGES*height / fontHeight);
		
		// Create the icon images
		try{
		  connectImage = Image.createImage("/images/connected.png");
		  disconnectImage = Image.createImage("/images/disconnected.png");
		  connectingImage = Image.createImage("/images/connecting.png");
		  iconHeight = connectImage.getHeight();
		  iconWidth = connectImage.getWidth();
		}catch(IOException ioe){
			BlueDump.display("Icons not found",RED);
			BlueDump.fireExitAlert();		
		}
		
		clearScreen(false);		
	}

	/** paint method called by the device for the refresh of the screen */
	protected void paint(Graphics g)
	{
		g.drawImage(screen, 0, 0, Graphics.TOP|Graphics.LEFT);

		// Draw status icon in upper left-hand corner based on state.
		if (BlueDump.singleton.getState() == BlueDump.CONNECT && connectImage != null) {
			g.drawImage(connectImage, 0, 0, Graphics.TOP|Graphics.LEFT);
		}
		else if (BlueDump.singleton.getState() == BlueDump.CONNECTING && connectingImage != null) {
			g.drawImage(connectingImage, 0, 0, Graphics.TOP|Graphics.LEFT);
		}
		else if (disconnectImage != null) {
			g.drawImage(disconnectImage, 0, 0, Graphics.TOP|Graphics.LEFT);
		}

	  //
	  // detemine midx based on the screen height and number of message
	  /*
	  midx = msgs.size() - (h/fh) ;
	  if ( midx < 0 )
		midx = 0;
		  */
		  		  
	  int y = fontHeight; // 1st line y value

	  // message will be rendered in black color, on top of white backgound

	  g.translate(-x0, -y0);

	  // render the messages on screen
	  for ( int i= 0; i< messages.size(); i++ )
	  {
	  	String s = (String)messages.elementAt(i);
	  	Integer color = (Integer)messagesColors.elementAt(i);
	  	g.setColor(color.intValue());
		g.drawString( s, iconWidth, y, Graphics.BASELINE | Graphics.LEFT );
		y += fontHeight;
	  }	  
	}

	/** Listener method implementation for the key events on the Canvas */
	public void keyPressed( int key )
	{
	  if ( ( getGameAction( key ) == Canvas.RIGHT ) )//&& 
	  		//x0<0 )
	  {
		x0+=20;
	  } else if ( getGameAction( key ) == Canvas.LEFT )
	  {
		x0-=20;
	  } else if ( ( getGameAction( key ) == Canvas.UP ) &&
	  				 y0>0 )
	  {	
		y0-=fontHeight;
	  } else if ( ( getGameAction( key ) == Canvas.DOWN ) &&
					y0 < (messages.size()*fontHeight) ) 
	  {
		y0+=fontHeight;
	  }
	  repaint();
	}
	
	/**
	 * Clear the whole screen
	 */
	public void clearScreen(boolean repaint) {
		// remove all stored messages
		messages.removeAllElements();
		messagesColors.removeAllElements();
		
		Graphics g = screen.getGraphics();
		// set RGB to maximum values, equivalent to the white colour
		g.setColor( 0xFF, 0xFF, 0xFF );
		g.fillRect( 0, 0, width, height );
		
		// set RGB to maximum values, equivalent to the black colour
		g.setColor(0);
		
		g.setFont( font );
		if (repaint) {
			repaint();
		}
	}


}