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

public class CalcGUI extends JFrame
{
   // components for top panel
   private JPanel _pnlTop = new JPanel();
   private JPanel _pnlStack = new JPanel();
   private JTextField _tfStack1 = new JTextField(20);
   private JTextField _tfStack2 = new JTextField(20);
   private JTextField _tfStack3 = new JTextField(20);

   // components for the keys
   private JPanel _pnlKeys = new JPanel();
   private JButton _jb0 = new JButton("0");
   private JButton _jb1 = new JButton("1");
   private JButton _jb2 = new JButton("2");
   private JButton _jb3 = new JButton("3");
   private JButton _jb4 = new JButton("4");
   private JButton _jb5 = new JButton("5");
   private JButton _jb6 = new JButton("6");
   private JButton _jb7 = new JButton("7");
   private JButton _jb8 = new JButton("8");
   private JButton _jb9 = new JButton("9");
   private JButton _jbDiv = new JButton("/");
   private JButton _jbMul = new JButton("*");
   private JButton _jbAdd = new JButton("+");
   private JButton _jbSub = new JButton("-");
   private JButton _jbEnter = new JButton("Enter");   
   private JButton _jbNeg = new JButton("Neg");
   private JButton _jbSpc = new JButton("Spc"); 
   private JButton _jbClrEntry = new JButton("Clr");   
   private JButton _jbClrStack = new JButton("Clr Stk");
   private JButton _jbDropTop = new JButton("Drop"); 
   private JButton _jbPoint = new JButton("."); 

   private JPanel _pnlWest = new JPanel();

   // components for the bottom panel
   private JPanel _pnlBottom = new JPanel();
   private JTextField _tfEntry = new JTextField(20);

   // components for the center panel
   private JButton _jbRollUp = new JButton("Up");
   private JButton _jbRollDown = new JButton("Dn");
   private JButton _btnOpenFile = new JButton("Open File");
   private JButton _btnSaveFile = new JButton("Save File");
   private JRadioButton _radioImm = new JRadioButton("Imm");
   private JRadioButton _radioExpr = new JRadioButton("Expr");


   // Layout Manager components
   private BorderLayout _borderLayout1 = new BorderLayout(10, 10);
   private GridBagLayout _gridbag = new GridBagLayout();
   private GridBagConstraints _c = new GridBagConstraints();

   //Construct the frame
  public CalcGUI ()
  {
      enableEvents (AWTEvent.WINDOW_EVENT_MASK);
      try
      {
         initGUI();
      }
      catch(Exception e)
      {
         e.printStackTrace();
      }
   }

  private void initGUI() throws Exception
  {
     //position and layout the out components
  }
	   

   //Overridden so we can exit on System Close
  protected void processWindowEvent(WindowEvent e)
  {
      super.processWindowEvent(e);
      if(e.getID() == WindowEvent.WINDOW_CLOSING)
      {
         System.exit(0);
      }
   }

	public JTextField get_tfEntry()
	{
		return(_tfEntry);
	}
  
    public JButton get_jbDiv()
	{
		return(_jbDiv);
	}

	public JButton get_jbAdd()
	{
		return(_jbAdd);
	}

	public JButton get_jbMul()
	{
		return(_jbMul);
	}

	public JButton get_jbSub()
	{
		return(_jbSub);
	}

	public JButton get_jbClrStack()
	{
		return(_jbClrStack);
	}

	public JButton get_jbDropTop()
	{
		return(_jbDropTop);
	}

	public JButton get_jbEnter()
	{
		return(_jbEnter);
	}

	public JButton get_jbRollUp()
	{
		return(_jbRollUp);
	}

	public JButton get_jbRollDown()
	{
		return(_jbRollDown);
	}

	public JRadioButton get_radioImm()
	{
		return(_radioImm);
	}

	public JRadioButton get_radioExpr()
	{
		return(_radioExpr);
	}

	public JButton get_btnOpenFile()
	{
		return(_btnOpenFile);
	}

	public JButton get_btnSaveFile()
	{
		return(_btnSaveFile);
	}

	public JTextField get_tfStack1()
	{
		return(_tfStack1);
	}

	public JTextField get_tfStack2()
	{
		return(_tfStack2);
	}

	public JTextField get_tfStack3()
	{
		return(_tfStack3);
	}

	public JButton get_jb2()
	{
		return(_jb2);
	}

	public JButton get_jbNeg()
	{
		return(_jbNeg);
	}

}