// MatrixDialog.java
import java.awt.*;
import java.awt.event.*;

public class MatrixDialog extends Dialog implements ActionListener,
                                                    KeyListener
{
   private Button close;

   public MatrixDialog(Frame parent, Matrix matrix)
   {
      super(parent, "Product", false);

      MatrixCanvas matrixCanvas = new MatrixCanvas(matrix);
      ScrollPane matrixPane = new ScrollPane(ScrollPane.SCROLLBARS_AS_NEEDED);
      matrixPane.setBackground(Color.white);
      matrixPane.add(matrixCanvas);
      matrixPane.setSize(300, 250);
      close = new Button("Close");
      close.addActionListener(this);
      close.addKeyListener(this);

      Panel buttonPanel = new Panel();
      buttonPanel.setLayout(new FlowLayout());
      buttonPanel.add(close);

      setLayout(new BorderLayout());
      add("Center", matrixCanvas);
      add("South", buttonPanel);
       
      addWindowListener(new WindowAdapter()
      {
         public void windowClosing(WindowEvent e)
         {
            close();
         }
      });

      validate();
      pack();
      Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
      int screenWidth = d.getSize().width,
          screenHeight = d.getSize().height - 27,
          parentWidth = parent.getSize().width,
          parentHeight = parent.getSize().height,
          w = this.getSize().width,
          h = this.getSize().height;
      Point p = parent.getLocation(), setp = parent.getLocation();
      if (p.x < 0)
         setp.x = (parentWidth + p.x - w) / 2;
      else if (p.x + parentWidth > screenWidth)
         setp.x = p.x + (screenWidth - p.x - w) / 2;
      else
         setp.x = p.x + (parentWidth - w) / 2;

      if (p.y < 0)
         setp.y = (parentHeight + p.y - h) / 2;
      else if (p.y + parentHeight > screenHeight)
         setp.y = p.y + (screenHeight - p.y - h) / 2;
      else
         setp.y = p.y + (parentHeight - h) / 2;

      if (setp.x < 0)
         setp.x = 0;
      else if (setp.x + w > screenWidth)
         setp.x = screenWidth - w;

      if (setp.y < 0)
         setp.y = 0;
      else if (p.y + h > screenHeight)
         setp.y = screenHeight - h;
      setLocation(setp);
      setVisible(true);
   }

   public void close()
   {
      setVisible(false);
      dispose();
   }

   public void keyPressed(KeyEvent ke)
   {
      if ((ke.getKeyText(ke.getKeyCode()).equals("Enter")) ||
          (ke.getKeyText(ke.getKeyCode()).equals("Escape")))
      {
         close();
      }
   }

   public void keyReleased(KeyEvent ke)
   {   }

   public void keyTyped(KeyEvent ke)
   {   }

   public void actionPerformed(ActionEvent ae)
   {
      close();
   }

}