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

/**
*
*/
public class CalcControl
{
   private CalcGUI _frame = new CalcGUI();
   private RPNEngine _rpnEngine = new RPNEngine();
   final JFileChooser fc = new JFileChooser();

   public CalcControl()
   {
      /* A few of the listeners are here as examples.  You should write the rest of them. */
       
      // listener for RollUp 
       JTextField entry = _frame.get_tfEntry();

      // listener for Save File button
       _frame.get_btnSaveFile().addActionListener (
         new java.awt.event.ActionListener()
         {
	      public void actionPerformed (ActionEvent e)
              {
	         int returnVal = fc.showOpenDialog(_frame);
               	 if (returnVal == JFileChooser.APPROVE_OPTION) {
             	    File file = fc.getSelectedFile();
		    PrintToFile.Singleton.printStrToFile(entry.getText(), file.getName());
		 }
	      }
         });

       

	// listener for Clr Stack button
      _frame.get_jbClrStack().addActionListener (
         new java.awt.event.ActionListener()
         {
	      public void actionPerformed (ActionEvent e)
              {
		 _rpnEngine.clearStack();
		 redrawStack();
	      }
         });
	


      _frame.setVisible(true);
   } // End CalcControl()

      /**
	* this function is called to update the textfields that contain
	* the 3 topmost elements of the stack 
	*/
     private void redrawStack()
     {
     }

   
   public static void main(String[] args)
   {
      try
      {
         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
      }
      catch(Exception e)
      {
      }
      new CalcControl();
   }


}