/*
An implementation of a Graphical User Interface for the Calculator class.
You should not modify this program as a part of your Programming Coursework.
It is provided solely as a demonstration of object-oriented programming technique.

TMK 8/2/01

Modified for JDK 2 implementation

TMK 5/3/01
*/

import java.awt.*;
import javax.swing.*;

public class CalculatorGUI extends javax.swing.JFrame
{
   // This string will hold the contents of the screen at all times.
   String screen_text = "";


   public CalculatorGUI()
   {

      Font f = new Font("Dialog", Font.BOLD, 18);

      // This code is automatically generated by Visual Cafe when you add
      // components to the visual environment. It instantiates and initializes
      // the components. To modify the code, only use code syntax that matches
      // what Visual Cafe can generate, or Visual Cafe may be unable to back
      // parse your Java file into its visual environment.
      //{{INIT_CONTROLS
      setTitle("CalculatorGUI");
      getContentPane().setLayout(null);
      setSize(300, 420);
      setVisible(false);
      JButtonGroupPanel1.setLayout(new GridLayout(4, 4, 3, 3));
      getContentPane().add(JButtonGroupPanel1);
      JButtonGroupPanel1.setBounds(24, 84, 254, 253);

      // Set the button text
      // Set the Action Command
      // Add the button to the group
      // Apply the correct font to each button
      // NB ORDER IS IMPORTANT FOR CORRECT LAYOUT

      b7.setText("7");
      b7.setActionCommand("7");
      JButtonGroupPanel1.add(b7);
      b7.setFont(f);

      b8.setText("8");
      b8.setActionCommand("8");
      JButtonGroupPanel1.add(b8);
      b8.setFont(f);

      b9.setText("9");
      b9.setActionCommand("9");
      JButtonGroupPanel1.add(b9);
      b9.setFont(f);

      badd.setText("+");
      badd.setActionCommand("+");
      JButtonGroupPanel1.add(badd);
      badd.setFont(f);

      b4.setText("4");
      b4.setActionCommand("4");
      JButtonGroupPanel1.add(b4);
      b4.setFont(f);

      b5.setText("5");
      b5.setActionCommand("5");
      JButtonGroupPanel1.add(b5);
      b5.setFont(f);

      b6.setText("6");
      b6.setActionCommand("6");
      JButtonGroupPanel1.add(b6);
      b6.setFont(f);

      bminus.setText("-");
      bminus.setActionCommand("-");
      JButtonGroupPanel1.add(bminus);
      bminus.setFont(f);

      b1.setText("1");
      b1.setActionCommand("1");
      JButtonGroupPanel1.add(b1);
      b1.setFont(f);

      b2.setText("2");
      b2.setActionCommand("2");
      JButtonGroupPanel1.add(b2);
      b2.setFont(f);

      b3.setText("3");
      b3.setActionCommand("3");
      JButtonGroupPanel1.add(b3);
      b3.setFont(f);

      bmultiply.setText("*");
      bmultiply.setActionCommand("*");
      JButtonGroupPanel1.add(bmultiply);
      bmultiply.setFont(f);

      bclear.setText("C");
      bclear.setActionCommand(".");
      JButtonGroupPanel1.add(bclear);
      bclear.setFont(f);

      b0.setText("0");
      b0.setActionCommand("0");
      JButtonGroupPanel1.add(b0);
      b0.setFont(f);

      bdot.setText(".");
      bdot.setActionCommand(".");
      JButtonGroupPanel1.add(bdot);
      bdot.setFont(f);

      bdivide.setText("/");
      bdivide.setActionCommand("/");
      JButtonGroupPanel1.add(bdivide);
      bdivide.setFont(f);

      screen.setText("0");
      screen.setHorizontalAlignment(
              javax.swing.SwingConstants.RIGHT);
      getContentPane().add(screen);
      screen.setFont(f);
      screen.setBounds(24, 24, 253, 37);

      bequals.setText("=");
      bequals.setActionCommand("=");
      getContentPane().add(bequals);
      bequals.setFont(f);
      bequals.setBounds(216, 348, 61, 61);
      //}}

      //{{INIT_MENUS
      //}}

      //{{REGISTER_LISTENERS

      // These are set to watch/listen to the mouse
      // and when its clicked they respond.
      SymMouse aSymMouse = new SymMouse();
      b9.addMouseListener(aSymMouse);
      b8.addMouseListener(aSymMouse);
      b7.addMouseListener(aSymMouse);
      b6.addMouseListener(aSymMouse);
      b5.addMouseListener(aSymMouse);
      b4.addMouseListener(aSymMouse);
      b3.addMouseListener(aSymMouse);
      b2.addMouseListener(aSymMouse);
      b1.addMouseListener(aSymMouse);
      b0.addMouseListener(aSymMouse);
      bdot.addMouseListener(aSymMouse);
      bequals.addMouseListener(aSymMouse);
      badd.addMouseListener(aSymMouse);
      bminus.addMouseListener(aSymMouse);
      bmultiply.addMouseListener(aSymMouse);
      bdivide.addMouseListener(aSymMouse);
      bclear.addMouseListener(aSymMouse);
      //}}
   }

   public CalculatorGUI(String sTitle)
   {
      this();
      setTitle(sTitle);
   }

   public void setVisible(boolean b)
   {
      if (b)
         setLocation(50, 50);
      super.setVisible(b);
   }

   static public void main(String args[])
   {
      (new CalculatorGUI()).setVisible(true);
   }

   public void addNotify()
   {
      // Record the size of the window prior to calling parents addNotify.
      Dimension size = getSize();

      super.addNotify();

      if (frameSizeAdjusted)
         return;
      frameSizeAdjusted = true;

      // Adjust size of frame according to the insets and menu bar
      Insets insets = getInsets();
      javax.swing.JMenuBar menuBar = getRootPane().getJMenuBar();
      int menuBarHeight = 0;
      if (menuBar != null)
         menuBarHeight = menuBar.getPreferredSize().height;
      setSize(insets.left + insets.right + size.width,
              insets.top + insets.bottom + size.height + menuBarHeight);
   }

   // Used by addNotify
   boolean frameSizeAdjusted = false;

   //{{DECLARE_CONTROLS
   JPanel JButtonGroupPanel1 =
           new JPanel();
//   com.symantec.itools.swing.JButtonGroupPanel JButtonGroupPanel1 =
//           new com.symantec.itools.swing.JButtonGroupPanel();
   javax.swing.JButton b7 = new javax.swing.JButton();
   javax.swing.JButton b8 = new javax.swing.JButton();
   javax.swing.JButton b9 = new javax.swing.JButton();
   javax.swing.JButton badd = new javax.swing.JButton();
   javax.swing.JButton b4 = new javax.swing.JButton();
   javax.swing.JButton b5 = new javax.swing.JButton();
   javax.swing.JButton b6 = new javax.swing.JButton();
   javax.swing.JButton bminus = new javax.swing.JButton();
   javax.swing.JButton b1 = new javax.swing.JButton();
   javax.swing.JButton b2 = new javax.swing.JButton();
   javax.swing.JButton b3 = new javax.swing.JButton();
   javax.swing.JButton bmultiply = new javax.swing.JButton();
   javax.swing.JButton bclear = new javax.swing.JButton();
   javax.swing.JButton b0 = new javax.swing.JButton();
   javax.swing.JButton bdot = new javax.swing.JButton();
   javax.swing.JButton bdivide = new javax.swing.JButton();
   javax.swing.JTextField screen =
           new javax.swing.JTextField();
   javax.swing.JButton bequals = new javax.swing.JButton();
   //}}

   //{{DECLARE_MENUS
   //}}

   // This is an inner class that handles the events such as when the mouse is clicked
   // or when a key is pressed.
   class SymMouse extends java.awt.event.MouseAdapter
   {

      int operator_count = 0;
      public void mouseClicked(java.awt.event.MouseEvent event)
      {
         try
         {
            // We need an instance of the calculator to use.
            Calculator mycalc = new Calculator();

            // What object caused the event to happen
            Object object = event.getSource();

            // Appending numbers to screen's contents when
            // number buttons are selected
            if (object == b9)
               screen_text = screen_text + "9";
            if (object == b8)
               screen_text = screen_text + "8";
            if (object == b7)
               screen_text = screen_text + "7";
            if (object == b6)
               screen_text = screen_text + "6";
            if (object == b5)
               screen_text = screen_text + "5";
            if (object == b4)
               screen_text = screen_text + "4";
            if (object == b3)
               screen_text = screen_text + "3";
            if (object == b2)
               screen_text = screen_text + "2";
            if (object == b1)
               screen_text = screen_text + "1";
            if (object == b0)
               screen_text = screen_text + "0";
            if (object == bdot)
               screen_text = screen_text + ".";

            // We have a separate method for when an operator is clicked
            // as we need to do it again later.
            if ((object == badd) || (object == bminus) ||
                    (object == bmultiply) || (object == bdivide))
            {
               screen_text += append_operator(object);
               operator_count++;
            }

            // Clear the contents and reset the operator counter
            if (object == bclear)
            {
               screen_text = "";
               operator_count = 0;
            }

            // Calculate a running total
            if (object != bequals && operator_count >= 2)
            {
               screen_text = calculate_running_total(screen_text, mycalc);
               operator_count = 0;
               if ((object == badd) || (object == bminus) ||
                       (object == bmultiply) || (object == bdivide))
               {
                  screen_text += append_operator(object);
               }
            }

            // Calculate the final total when the equals button is pressed
            if (object == bequals)
            {
               screen_text = calculate_total(screen_text, mycalc);
               operator_count = 0;
            }

            // Remember to redraw the screen else nothing will happen
            update_screen();

         }
         catch (Exception e)
         {
            // Just in case it goes pear-shaped, tell us what went wrong
            System.out.println(e.toString());
         }
      }
   }

   // Update the box containing the numbers and operators
   void update_screen()
   {
      try
      {
         screen.setText(screen_text);
      }
      catch (java.lang.Exception e)
      {
      }
   }

   // A method that takes the object and returns it textual representation
   // The explicit cast to a button is acceptable since we're only using buttons
   // in this case.
   String append_operator(Object object)
   {
      JButton foo = (JButton) object;
      return foo.getText();
   }

   // Calculate the running total by loping the last operator off the end of the line
   // May be required dependent on implementation of Calculator class
   String calculate_running_total(String calculation, Calculator mycalc)
   {
      calculation =
              calculation.substring(0, calculation.length() - 1) + "=";
      return calculate_total(calculation, mycalc);
   }

   // Generate final total
   // Print statements to aid with debugging of GUI, but left in.
   String calculate_total(String calculation, Calculator mycalc)
   {
      System.out.println("Calculation called with: " + calculation);
      System.out.println("Calculation returned with: " +
              mycalc.workOut(calculation));
      Double foodle = new Double(mycalc.workOut(calculation));
      return foodle.toString();
   }
}