// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//  File Name  : InputPanel.java
//  Purpose    : Provides a standard input panel for the temp. converter
//  Author     : B.J. Johnson
//  Date       : 20-Jul-2005
//  Description: This class provides a standard input panel for the TempConv
//                temperature conversion program.  The panel extends the
//                swing JPanel component, and comprises to parts.  One is
//                a label that indicates the temperature scale for this
//                panel.  The other is a JTextField into which the value of
//                the temperature can be typed.
//  Notes      :
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//                COPYRIGHT (C)  LOYOLA MARYMOUNT UNIVERSITY
//
//   Written by B.J. Johnson (bjohnson05@gmail.com),  All rights reserved
//                      Offered as freeware, under GPL
//
//  Refer to: http://www.gnu.org/licenses/gpl.html to obtain a copy of the
//                 Gnu Public License, and read the details
//
//    This software is offered without warranty of any kind;  the author
//  and/or copyright holder is not responsible  for any damage to hardware
//          or any unexpected results that may occur from its use.
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//  Revision History
//  ----------------
//
//   Rev    Rev. Date   Modified by:  Description of change
//  -----  -----------  ------------  --------------------------------------
//  1.0-0  20-Jul-2005  B.J. Johnson  Initial coding and capture
//
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //  IMPORTS AND PACKAGES
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   import java.awt.event.ActionEvent;
   import java.awt.event.ActionListener;
   import java.awt.GridLayout;
   import java.awt.event.WindowAdapter;
   import java.awt.event.WindowEvent;
   import javax.swing.JFrame;
   import javax.swing.JLabel;
   import javax.swing.JPanel;
   import javax.swing.JTextField;

  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //  CLASS DEFINITION
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   public class InputPanel extends JPanel
   {
      private JLabel      whatAmI;
      private JTextField  myData;
      private TempConvApp parent;
      private char        converter;

     // Constructor takes a string for the label to display
      public InputPanel( String label )
      {
         whatAmI = new JLabel( label );
         myData = new JTextField( 10 );
         whatAmI.setText( label );
         this.setLayout( new GridLayout( 1, 2 ) );
         this.add( whatAmI );
         this.add( myData  );

      }

     // Constructor takes a label and an instance of the parent TempConv class
      public InputPanel( String label, TempConvApp mom, char which )
      {
         whatAmI   = new JLabel( label );
         myData    = new JTextField( 10 );
         parent    = mom;
         converter = which;
         whatAmI.setText( label );

        // Add an action listener to fire the conversion/display method
         myData.addActionListener( new ActionListener()
         {
            public void actionPerformed( ActionEvent ae )
            {
               String lastAction     = ae.getActionCommand();
               parent.convertme( converter );
            }
         } );

         this.setLayout( new GridLayout( 1, 2 ) );
         this.add( whatAmI );
         this.add( myData  );

      }

     // This method returns the value of the text field as a double.  If the
     //  "Enter" key was pressed in an empty field, the value of 0.0 will be
     //  assumed to prevent NumberFormat exceptions.
      public double getValue()
      {
         double realValue;
         String value = myData.getText();
         try
         {
            realValue = Double.parseDouble( value );
         }
         catch( NumberFormatException nfe ) { realValue = 0; }
         return( realValue );
      }

     // This method set the value of the text field from a double
      public void setValue( double newValue )
      {
         myData.setText( Double.toString( newValue ) );
      }

     // This method returns the value of the text field as a double
      public void clearField()
      {
         myData.setText( "" );
      }

     // The main method is just for testing.
      public static void main( String[] args )
      {
         JFrame     jf = new JFrame();
         InputPanel fp = new InputPanel( new String( "Blah blah blah: " ));
         jf.getContentPane().add( fp );
         jf.setSize( 275, 100 );
         jf.setLocation( 500, 500 );
         jf.setVisible( true );

        // Add a window listener to close the window
         jf.addWindowListener( new WindowAdapter()
         {
            public void windowClosing( WindowEvent e )
            {
               System.exit( 0 );
            }
         });

      }

   }