// Fig. 25.16: BoxLayoutFrame.java
// Demonstrating BoxLayout.
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.BoxLayout;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;

public class BoxLayoutFrame extends JFrame 
{
   // set up GUI
   public BoxLayoutFrame()
   {
      super( "Demonstrating BoxLayout" );

      // create Box containers with BoxLayout
      Box horizontal1 = Box.createHorizontalBox();
      Box vertical1 = Box.createVerticalBox();
      Box horizontal2 = Box.createHorizontalBox();
      Box vertical2 = Box.createVerticalBox();

      final int SIZE = 3; // number of buttons on each Box

      // add buttons to Box horizontal1
      for ( int count = 0; count < SIZE; count++ )
         horizontal1.add( new JButton( "Button " + count ) );

      // create strut and add buttons to Box vertical1
      for ( int count = 0; count < SIZE; count++ ) 
      {
         vertical1.add( Box.createVerticalStrut( 25 ) );
         vertical1.add( new JButton( "Button " + count ) );
      } // end for

      // create horizontal glue and add buttons to Box horizontal2
      for ( int count = 0; count < SIZE; count++ ) 
      {
         horizontal2.add( Box.createHorizontalGlue() );
         horizontal2.add( new JButton( "Button " + count ) );
      } // end for

      // create rigid area and add buttons to Box vertical2
      for ( int count = 0; count < SIZE; count++ ) 
      {
         vertical2.add( Box.createRigidArea( new Dimension( 12, 8 ) ) );
         vertical2.add( new JButton( "Button " + count ) );
      } // end for

      // create vertical glue and add buttons to panel
      JPanel panel = new JPanel();
      panel.setLayout( new BoxLayout( panel, BoxLayout.Y_AXIS ) );

      for ( int count = 0; count < SIZE; count++ ) 
      {
         panel.add( Box.createGlue() );
         panel.add( new JButton( "Button " + count ) );
      } // end for

      // create a JTabbedPane
      JTabbedPane tabs = new JTabbedPane( 
         JTabbedPane.TOP, JTabbedPane.SCROLL_TAB_LAYOUT ); 

      // place each container on tabbed pane
      tabs.addTab( "Horizontal Box", horizontal1 );
      tabs.addTab( "Vertical Box with Struts", vertical1 );
      tabs.addTab( "Horizontal Box with Glue", horizontal2 );
      tabs.addTab( "Vertical Box with Rigid Areas", vertical2 );
      tabs.addTab( "Vertical Box with Glue", panel );

      add( tabs ); // place tabbed pane on frame
   } // end BoxLayoutFrame constructor
} // end class BoxLayoutFrame

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