buttonbar.java

文字信息巡回显示Java小程序

import java.awt.*;
import java.net.*;
import java.awt.image.*;

public class ButtonBar extends java.applet.Applet implements Runnable {

//Parsed vars
static int[] msgnum, x1, x2, y1, y2;
static int[] mapx1, mapx2, mapy1, mapy2;
static String[][] msgtext;
static String fontname;
static int fontsize, buttnum;
static boolean[] left;
static String[][] textURL;

String click;

Color textColor = Color.blue;

int globalX, globalY;
int curButt = 0, cnt = 100;
int[] maxtextWidth;
int fheight;

int[][] msgtextWidth;
Image image, ring, offscreen;
Graphics gc, g;
MediaTracker mt;
Thread juicer = null;
boolean[] buttOn;
boolean buttPushed = false;

FontMetrics fm;
Font font;

public void init() {
	ButtonBarParseArgs bbpa = new ButtonBarParseArgs(this);
	
	offscreen = createImage(473, 260);
   gc = offscreen.getGraphics();

   mt = new MediaTracker(this);
   image = getImage(getCodeBase(), "images/sis_frontnav2.jpg");
	ring = getImage(getCodeBase(), "images/ring.gif");
   mt.addImage(image, 0);
   mt.addImage(ring, 0);

   
   try  {
      mt.waitForAll();
   }
   catch(InterruptedException e) {
   System.out.println("interrupted load of images");
   }
  	
	font = new Font(fontname, Font.BOLD, fontsize);
	
	fm = gc.getFontMetrics(font);
	
	fheight = fm.getMaxAscent() - fm.getMaxDescent() +5;
	
   msgtextWidth = new int[buttnum][10];
	maxtextWidth = new int[buttnum];
	x2 = new int[buttnum];
	y2 = new int[buttnum];
	buttOn = new boolean[buttnum];
	for (int j = 0; j <buttnum; j++)  {
	
		for( int i = 0; i < msgnum[j]; i++)  {		
			msgtextWidth[j][i] = fm.stringWidth(msgtext[j][i]);
	      if (maxtextWidth[j] < msgtextWidth[j][i]) maxtextWidth[j] 
				= msgtextWidth[j][i];			
		}
		y2[j] = fheight * msgnum[j];
   	x2[j] = x1[j] + maxtextWidth[j];
	}
}

public void start() {
   if(juicer == null) {
      juicer = new Thread(this);
      juicer.start();
   }
}
	
public void stop() {
   if ( (juicer != null) && (juicer.isAlive()) ) {
      juicer.stop();
      juicer = null;
   }
}

public void run() {
   int i;
   boolean noButtOn;
   gc.drawImage(image, 0, 0, this);
   gc.setFont(font);
   while (true)  {
		noButtOn = true;
      if (cnt < 50){  i = cnt;

         if( left[i] ) x1[i] = mapx1[i] - maxtextWidth[i];
         else x1[i] = mapx2[i];

         y1[i] = (mapy1[i] + mapy2[i])/2 - fheight * msgnum[i];

         gc.drawImage(image, 0, 0, this);
         gc.setColor(Color.red);
         gc.setColor(Color.white);
         gc.drawImage(ring, mapx1[i], mapy1[i], 59, 59, this);
         gc.fillRect(x1[i] - 10, y1[i], x2[i] + 15, y2[i] + 5);
         gc.setColor(Color.black);
         gc.drawRect(x1[i] - 10, y1[i], x2[i] + 14, y2[i] + 4 );

         for( int j = 0; j < msgnum[i]; j++)  {
            if(globalY < y1[i] + fheight + fheight * j && 
               globalY > y1[i] + fheight * j)
            {  
               click = textURL[i][j];
               gc.setColor(Color.red);
               gc.fillOval(x1[i] - 8, y1[i] + fheight/2 + fheight * j, 4, 5);
               gc.setColor(textColor);
               showStatus(textURL[i][j]);
            }
        
            gc.drawString(msgtext[i][j], x1[i] + 2, 
               y1[i] + fheight + fheight * j);
            gc.setColor(Color.black);
            gc.drawOval(x1[i] - 8, y1[i] + fheight/2 + fheight * j, 4, 5);

         }
         noButtOn = false;
      }
		
      repaint();
      try { juicer.sleep(60); }
      catch(InterruptedException e) { }
      if (cnt==100)  {
         showStatus("Copyright 1997 Southern Internet");
         gc.drawImage(image, 0, 0, this);
      }
	}
}
	
public void update(Graphics g) { 
   paint(g); 
}

public void paint(Graphics g) {
   g.drawImage(offscreen, 0, 0, this);
}
	
public boolean mouseMove(Event evt, int x, int y)  {
   globalX = x;
   globalY = y;
 //  System.out.println("x: " + x + "  y: " +y);
//   System.out.println(cnt);
   buttPushed = false;
   boolean someButtOn = false;
	for ( int i=0; i < buttnum; i++ )  {
      if (buttPushed) buttOn[i] = false;
      else {
         if ( x > mapx1[i] && x < mapx2[i] && y > mapy1[i] && y < mapy2[i] ) {
            buttOn[i] = true;
            someButtOn = true;
				cnt = i;
         }
         else if ( !left[i] && buttOn[i] && x > mapx2[i] - 15 && 
            x < mapx2[i] + maxtextWidth[i] + 5 && 
            y > (mapy2[i] + mapy1[i])/2 - fheight * msgnum[i] &&
            y < (mapy2[i] + mapy1[i])/2 + 10)  {
            for(int s=0; s < buttnum; s++) {
               buttOn[s] = false;
            }

            buttOn[i] = true; cnt = i;
            someButtOn = true;
            buttPushed = true;
            }
      else if ( left[i] && buttOn[i] && x > mapx1[i] - maxtextWidth[i] -10&& 
            x < mapx1[i] + 20 && 
            y > (mapy2[i] + mapy1[i])/2 - fheight * msgnum[i] &&
            y < mapy2[i] )  {
            for(int k=0; k < buttnum; k++) {
               buttOn[k] = false;
            }

            buttOn[i] = true; cnt = i;
            someButtOn = true;
            buttPushed = true;
         }
         else buttOn[i] = false;
      }
	}
   if (!someButtOn) cnt = 100;
   return(true);
}

public boolean mouseUp( Event evt, int x , int y ) 
{
   try
   {  URL thingee = new URL(click);
      getAppletContext().showDocument(thingee);
   }
   catch (MalformedURLException e)
   {  System.out.println("hey I caught it!!!");
		System.out.println(click + " exception");
   }
   return true;
}

}