//GBL1.java
//Demonstrate the GridbagLayout
//Andy Harris, 05/00

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class GBL1 extends Applet{
  Frame frmGBL = new Frame("Grid Bag Demo");
  Button btnShowFrame = new Button("Show Frame");
  EventHandler evt = new EventHandler();
  GridBagLayout gbl = new GridBagLayout();
  GridBagConstraints c = new GridBagConstraints();
  
  public void init(){
    add (btnShowFrame);
    btnShowFrame.addActionListener(evt);
    setUpFrame();
  } // end init

  private class EventHandler extends WindowAdapter implements ActionListener{

    public void actionPerformed(ActionEvent e){
      frmGBL.setVisible(true);
      frmGBL.setSize(400,300);
    } // end actionPerformed

    public void windowClosing(WindowEvent e){
      frmGBL.setVisible(false);
      frmGBL.dispose();
    } // end windowClosing

  } // end eventHandler class
  
  public void setUpFrame(){
    
    Button btn1 = new Button("Component 1");
    Button btn2 = new Button("Component 2");
    Button btn3 = new Button("Component 3");
    Button btn4 = new Button("Component 4");
    Button btn5 = new Button("Component 5");
    Button btn6 = new Button("Component 6");
    Button btn7 = new Button("Component 7");
  
    frmGBL.setLayout(gbl);
    frmGBL.addWindowListener(evt);
    
    //-------------- button one --------------
    c.gridx = 0;
    c.gridy = 0;
    c.gridheight = 1;
    c.gridwidth = 3;
    c.fill = c.BOTH;
    c.weightx = 50;
    c.weighty = 25;
    
    gbl.setConstraints (btn1, c);
    frmGBL.add(btn1);


    //-------------- button two --------------
    c.gridx = 0;
    c.gridy = 1;
    c.gridheight = 2;
    c.gridwidth = 1;
    c.fill = c.BOTH;
    c.weightx = 50;
    c.weighty = 100;
    
    gbl.setConstraints (btn2, c);
    frmGBL.add(btn2);


    //-------------- button three --------------
    c.gridx = 1;
    c.gridy = 1;
    c.gridheight = 1;
    c.gridwidth = 2;
    c.fill = c.BOTH;
    c.weightx = 50;
    c.weighty = 25;
    
    gbl.setConstraints (btn3, c);
    frmGBL.add(btn3);

    //-------------- button four --------------
    c.gridx = 1;
    c.gridy = 2;
    c.gridheight = 2;
    c.gridwidth = 1;
    c.fill = c.BOTH;
    c.weightx = 25;
    c.weighty = 50;
    
    gbl.setConstraints (btn4, c);
    frmGBL.add(btn4);

    //-------------- button five --------------
    c.gridx = 2;
    c.gridy = 2;
    c.gridheight = 1;
    c.gridwidth = 1;
    c.fill = c.BOTH;
    c.weightx = 25;
    c.weighty = 25;
    
    gbl.setConstraints (btn5, c);
    frmGBL.add(btn5);

    //-------------- button six --------------
    c.gridx = 0;
    c.gridy = 3;
    c.gridheight = 1;
    c.gridwidth = 1;
    c.fill = c.BOTH;
    c.weightx = 50;
    c.weighty = 25;
    
    gbl.setConstraints (btn6, c);
    frmGBL.add(btn6);

    //-------------- button seven --------------
    c.gridx = 2;
    c.gridy = 3;
    c.gridheight = 1;
    c.gridwidth = 1;
    c.fill = c.BOTH;
    c.weightx = 25;
    c.weighty = 25;
    
    gbl.setConstraints (btn7, c);
    frmGBL.add(btn7);
  } // end setUpFrm

} // end class def