/*
 *  =====================================================================
 *  DemoScrollBar.java :  ....
 * 
 *  Written by : John Vella; Appeared in Java Swing book .... 
 *  Converted to applet format by : Mark Austin               March, 2001
 *  =====================================================================
 */

import javax.swing.*;
import javax.swing.event.MouseInputAdapter;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class DemoScrollBar extends JApplet  {
   int x, y;
   int flag;
   
   public void init() {

        // 1. Get the content pane and assign layout

        Container container = getContentPane();

        // 2. Add the canvas with rectangles

        DemoScrollBarGraphics ct = new DemoScrollBarGraphics( this );
        container.add( ct );
   }
}

// 3. Implement the canvas with mouse listener ...

class DemoScrollBarGraphics extends Canvas {
   DemoScrollBar dmm;

   public DemoScrollBarGraphics( DemoScrollBar dmm ) {
      this.dmm = dmm;   
      this.dmm.setBackground(Color.white);
      this.dmm.addMouseListener(new DemoScrollBarMouseListener());
   }
   
   // Paint the graphics ....

   public void paint(Graphics g) {

      // Fill canvas with background color  ....

      g.setColor( Color.white );
      g.fillRect(0, 0, getWidth(), getHeight());

      // Write blue text on the canvas  ......

      g.setColor(Color.blue);
      g.drawString("Drag/Move the Mouse ...", 5, 20);
      g.setColor(Color.red);

      if( dmm.flag == 1 ) {
         g.drawString("Don't Move! Drag the Mouse!", 5, 85);
         g.drawString("Cursor Coordinates: " + dmm.x + ", " + dmm.y, 5, 95);
      }
      else if( dmm.flag == 2 ) {
         g.drawString("Don't Drag! Move the Mouse!", 5, 85);
         g.drawString("Cursor Coordinates: " + dmm.x + ", " + dmm.y, 5, 95);
      }
   }

   // 3. The update() method to repair the applet's background.
   //    This can reduce the performance and lead to flickering.
   //    The workaround is to use a JPanel attached to the applet.

   public void update(Graphics g) {
       g.setColor( this.getBackground() );
       g.fillRect(0, 0, getWidth(), getHeight());
       paint(g);
   }

   // Repaint the graphics ....

   void repaint(Graphics g) {
      g.setColor(Color.blue);
      g.drawString("You're in repaint() ...", 15, 20);
   }

   // Mouse listener for canvas ....

   class DemoScrollBarMouseListener extends MouseInputAdapter {

      // Executed when the mouse is clicked ...

      public void mouseClicked(MouseEvent me) {

         // Set the flag value
         // Get the coordinates of the mouse pointer.

         dmm.flag = 1; 
         dmm.x = me.getX(); 
         dmm.y = me.getY();

         // Repaint the applet.

         dmm.repaint();
      }

      // Executed when the mouse is released.

      public void mouseReleased(MouseEvent me) {

         // Set the flag value
         // Get the coordinates of the mouse pointer.

         dmm.flag = 2;
         dmm.x = me.getX();
         dmm.y = me.getY();

         // Repaint the applet.

         dmm.repaint();
      }
   }
}