// Fig. 17.6: BankUI.java
// A reusable GUI for the examples in this chapter.
package com.deitel.jhtp5.ch17;

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

public class BankUI extends JPanel {

   // label text for GUI
   protected final static String names[] = { "Account number",
      "First name", "Last name", "Balance", "Transaction Amount" };

   // GUI components; protected for future subclass access
   protected JLabel labels[];
   protected JTextField fields[];
   protected JButton doTask1, doTask2;
   protected JPanel innerPanelCenter, innerPanelSouth;

   protected int size; // number of text fields in GUI

   // constants representing text fields in GUI
   public static final int ACCOUNT = 0, FIRSTNAME = 1, LASTNAME = 2, 
      BALANCE = 3, TRANSACTION = 4;

   // Set up GUI. Constructor argument size determines the number of
   // rows of GUI components.
   public BankUI( int mySize )
   {
      size = mySize;
      labels = new JLabel[ size ];
      fields = new JTextField[ size ];

      // create labels
      for ( int count = 0; count < labels.length; count++ )
         labels[ count ] = new JLabel( names[ count ] );
            
      // create text fields
      for ( int count = 0; count < fields.length; count++ )
         fields[ count ] = new JTextField();

      // create panel to lay out labels and fields
      innerPanelCenter = new JPanel();
      innerPanelCenter.setLayout( new GridLayout( size, 2 ) );

      // attach labels and fields to innerPanelCenter
      for ( int count = 0; count < size; count++ ) {
         innerPanelCenter.add( labels[ count ] );
         innerPanelCenter.add( fields[ count ] );
      }
      
      // create generic buttons; no labels or event handlers
      doTask1 = new JButton();
      doTask2 = new JButton(); 

      // create panel to lay out buttons and attach buttons
      innerPanelSouth = new JPanel();      
      innerPanelSouth.add( doTask1 );
      innerPanelSouth.add( doTask2 );

      // set layout of this container and attach panels to it
      setLayout( new BorderLayout() );
      add( innerPanelCenter, BorderLayout.CENTER );
      add( innerPanelSouth, BorderLayout.SOUTH );

      validate(); // validate layout 

   } // end constructor

   // return reference to generic task button doTask1
   public JButton getDoTask1Button() 
   { 
      return doTask1; 
   }

   // return reference to generic task button doTask2
   public JButton getDoTask2Button() 
   { 
      return doTask2; 
   }

   // return reference to fields array of JTextFields
   public JTextField[] getFields() 
   { 
      return fields; 
   }

   // clear content of text fields
   public void clearFields()
   {
      for ( int count = 0; count < size; count++ )
         fields[ count ].setText( "" );
   }

   // set text field values; throw IllegalArgumentException if
   // incorrect number of Strings in argument
   public void setFieldValues( String strings[] )
      throws IllegalArgumentException
   {
      if ( strings.length != size )
         throw new IllegalArgumentException( "There must be " +
            size + " Strings in the array" );

      for ( int count = 0; count < size; count++ )
         fields[ count ].setText( strings[ count ] );
   }

   // get array of Strings with current text field contents
   public String[] getFieldValues()
   { 
      String values[] = new String[ size ];

      for ( int count = 0; count < size; count++ ) 
         values[ count ] = fields[ count ].getText();

      return values;
   }

} // end class BankUI


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