/**
 *  <PRE>
 *  CalculatorGUI.java
 *
 *  Revisions: 1.1 Mar. 14, 2001
 *               Added minor modifications to calculation behavior.  Added
 *               some documentation.
 *             1.0 Jan. 11, 2001
 *               Created the CalculatorGUI class
 *
 *  </PRE>
 *
 *  @author <A HREF="mailto:demox@cc.gatech.edu">Luke A. Olbrish</A>
 *  @version Version 1.0, Jan. 11, 2001
 */

// I must import java libraries in order to work with swing.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CalculatorGUI
{
  /**
   *  The main frame of the program.  This will contain all of the other
   *  gui components.
   */
  private JFrame guiFrame = null;

  /**
   *  This panel will be the only component directy added to the frame.
   *  Instead, this panel will be where all other gui components will be added.
   */
  private Container contentPane = null;

  /**
   *  This label will be used as the display for the numbers of the calculator.
   *  The label will be placed in the top of the contentPane.
   */
  private JLabel numberLabel = null;

  /**
   *  This panel is where the operator and digit buttons will be placed.  It
   *  will be the main content of the contentPane.
   */
  private JPanel buttonPanel = null;

  /**
   *  This panel will contain the clear and equal buttons.  It will be in the
   *  lower section of the content pane.
   */
  private JPanel operationPanel = null;

  /**
   *  This array, which will be of size 10.  It will hold 10 digit buttons.
   */
  private JButton[] numberedButtons = null;

  /**
   *  This array, which will be of size 6.  It will hold the operations.
   */
  private JButton[] operationButtons = null;

  /**
   *  This is the control for the program.  It will handle all events that
   *  occur in this gui.
   */
  private EventHandler event = null;

  // Constructors

  public CalculatorGUI()
  {
    doMakeObjects();
    doAddObjects();
    doCustomizations();
    doEventHandling();

    // This sets the size of the screen based on the preferred size of the
    // GUI components.
    guiFrame.pack();
    guiFrame.setVisible( true );
  }// end of constructor()

  // Constructor Helpers

  /**
   *  This function will create all of the components that are needed for the
   *  gui.  It should initialize the guiFrame, contentPane, buttonPanel,
   *  operationPanel, numberLabel, numberedButtons, and operationButtons.
   *  You should also set your layouts here.
   */
  public void doMakeObjects()
  {
    // ### Add your code here. ####
	guiFrame.getContentPane().setLayout(new BorderLayout());
	
    // ### Done ###
  }// end of doMakeObjects()

  /**
   *  This function is where you should add the components.  You should add
   *  the numberedButtons and +, -, *, / to buttonPanel.  Clr and = should
   *  be added to operationPanel.  numberLabel should be added to the top of
   *  the contentPane, buttonPanel to the center, and operationPanel to the
   *  bottom.
   */
  public void doAddObjects()
  {
    guiFrame.setContentPane( contentPane );

    // ### Add your code here. ####

    // ### Done ###
  }// end of doAddObjects()

  /**
   *  This is where you should set the background colors for the buttons.
   *  You should also increase the label's font size and prevent all the
   *  buttons from having their focus be painted.
   */
  public void doCustomizations()
  {
    // ### Add your code here. ####

    // ### Done ###
  }// end of doCustomizations()

  public void doEventHandling()
  {
    // Add the event handler that will monitor events from this GUI.
    event = new EventHandler( this );

    // Make event respond to button presses on the numbers from the GUI.
    for( int x = 0; x < 10; x++ )
      numberedButtons[x].addActionListener( event );

    // Make event respond to button presses on the other buttons from the
    // GUI.
    for( int x = 0; x < 6; x++ )
      operationButtons[x].addActionListener( event );

    // This is a specialized way of creating a class that will handle
    // window frame events.  More on this in the next lab...
    guiFrame.addWindowListener( new WindowAdapter()
      {
        public void windowClosing( WindowEvent we )
        {
          System.exit( 0 );
        }// end of windowClosing( WindowEvent )
      });// end of WindowAdapter inner class
  }// end fo doEventHandling()

  // Accessors

  /**
   *  This function should return the text from the numberLabel.
   *
   *  @return the contents of numberLabel.
   */
  public String getDisplay()
  {
    // ### Add your code here. ####
    return numberLabel.getText();
    // ### Done ###
  }// end of getDisplay()

  // Modifiers

  /**
   *  This function should set the text in numberLabel.
   *
   *  @param value the string to set as the text for numberLabel
   */
  public void setDisplay( String value )
  {
    // ### Add your code here. ####
    numberLabel.setText(value);
    // ### Done ###
  }// end of setDisplay( String )

  /**
   *  The driver for the program.
   *
   *  @param args a String array of arguements.
   */
  public static void main( String[] args )
  {
    CalculatorGUI gui = new CalculatorGUI();
  }// end of main( String[] )

}// end of class CalculatorGUI