// Fig. 22.31: GridBagFrame2.java
// Demonstrating GridBagLayout constants.
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Component;
import javax.swing.JFrame;
import javax.swing.JComboBox;
import javax.swing.JTextField;
import javax.swing.JList;
import javax.swing.JButton;

public class GridBagFrame2 extends JFrame 
{ 
   private GridBagLayout layout; // layout of this frame
   private GridBagConstraints constraints; // constraints of this layout
    
   // set up GUI
   public GridBagFrame2()
   {
      super( "GridBagLayout" );
      layout = new GridBagLayout();
      setLayout( layout ); // set frame layout 
      constraints = new GridBagConstraints(); // instantiate constraints

      // create GUI components
      String metals[] = { "Copper", "Aluminum", "Silver" };
      JComboBox comboBox = new JComboBox( metals );

      JTextField textField = new JTextField( "TextField" );

      String fonts[] = { "Serif", "Monospaced" };
      JList list = new JList( fonts );

      String names[] = { "zero", "one", "two", "three", "four" };
      JButton buttons[] = new JButton[ names.length ];

      for ( int count = 0; count < buttons.length; count++ )
         buttons[ count ] = new JButton( names[ count ] );

      // define GUI component constraints for textField
      constraints.weightx = 1;
      constraints.weighty = 1;  
      constraints.fill = GridBagConstraints.BOTH;
      constraints.gridwidth = GridBagConstraints.REMAINDER;
      addComponent( textField );

      // buttons[0] -- weightx and weighty are 1: fill is BOTH
      constraints.gridwidth = 1;
      addComponent( buttons[ 0 ] );

      // buttons[1] -- weightx and weighty are 1: fill is BOTH
      constraints.gridwidth = GridBagConstraints.RELATIVE;
      addComponent( buttons[ 1 ] );

      // buttons[2] -- weightx and weighty are 1: fill is BOTH
      constraints.gridwidth = GridBagConstraints.REMAINDER;
      addComponent( buttons[ 2 ] );

      // comboBox -- weightx is 1: fill is BOTH
      constraints.weighty = 0;
      constraints.gridwidth = GridBagConstraints.REMAINDER;
      addComponent( comboBox );
      
      // buttons[3] -- weightx is 1: fill is BOTH
      constraints.weighty = 1;
      constraints.gridwidth = GridBagConstraints.REMAINDER;
      addComponent( buttons[ 3 ] ); 

      // buttons[4] -- weightx and weighty are 1: fill is BOTH
      constraints.gridwidth = GridBagConstraints.RELATIVE;
      addComponent( buttons[ 4 ] );

      // list -- weightx and weighty are 1: fill is BOTH
      constraints.gridwidth = GridBagConstraints.REMAINDER;
      addComponent( list );
   } // end GridBagFrame2 constructor

   // add a component to the container
   private void addComponent( Component component ) 
   {
      layout.setConstraints( component, constraints );
      add( component ); // add component
   } // end method addComponent
} // end class GridBagFrame2

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