GridBagLayout Example

GridBagLayout example

<code=java> import java.awt.*; import static java.awt.GridBagConstraints.*; import javax.swing.*;

public class GridBagLayoutExample extends JPanel {

   //GB arguments:
   private int gridx, gridy, gridwidth, gridheight, fill, anchor, ipadx, ipady;
   private double weightx, weighty;
   private Insets insets;
   // GB Insets:
   private int top, left, bottom, right;
   private final Insets insetsTop = new Insets(top = 5, left = 0, bottom = 15, right = 0);
   private final Insets insetsLabel = new Insets(top = 0, left = 10, bottom = 6, right = 5);
   private final Insets insetsText = new Insets(top = 0, left = 0, bottom = 6, right = 10);
   private final Insets insetsBottom = new Insets(top = 10, left = 0, bottom = 10, right = 0);
   //input fields:
   private JTextField name;
   private JTextField age;
   private JTextArea comment;
   private JButton btOK;

   public GridBagLayoutExample() {
       setLayout(new GridBagLayout());
       example();
   }

   private void example() {
       initArgsGB();
       addGB(new JLabel("Registration form"), gridx = 1, gridy = 1,
               gridwidth = 2, gridheight, fill,
               weightx = 1.0, weighty, anchor,
               insets = insetsTop);
       initArgsGB();
       addGB(new JLabel("Name"), gridx = 1, gridy = 2,
               gridwidth, gridheight, fill,
               weightx, weighty, anchor = LINE_START,
               insets = insetsLabel);
       initArgsGB();
       name = new JTextField();
       addGB(name, gridx = 2, gridy = 2,
               gridwidth = 1, gridheight = 1, fill = HORIZONTAL,
               weightx = 1.0, weighty, anchor,
               insets = insetsText);
       initArgsGB();
       addGB(new JLabel("Age"), gridx = 1, gridy = 3,
               gridwidth, gridheight, fill,
               weightx, weighty, anchor = LINE_START,
               insets = insetsLabel);
       initArgsGB();
       age = new JTextField(3);
       age.setMinimumSize(age.getPreferredSize());
       addGB(age, gridx = 2, gridy = 3,
               gridwidth, gridheight, fill,
               weightx, weighty, anchor = LINE_START,
               insets = insetsText);
       initArgsGB();
       addGB(new JLabel("Comment"), gridx = 1, gridy = 4,
               gridwidth, gridheight, fill,
               weightx, weighty, anchor = FIRST_LINE_START,
               insets = insetsLabel);
       initArgsGB();
       comment = new JTextArea();
       addGB(new JScrollPane(comment), gridx = 2, gridy = 4,
               gridwidth, gridheight, fill = BOTH,
               weightx = 1.0, weighty = 1.0, anchor,
               insets = insetsText);
       initArgsGB();
       btOK = new JButton("OK");
       addGB(btOK, gridx = 1, gridy = 5,
               gridwidth = 2, gridheight = 1, fill,
               weightx, weighty, anchor,
               insets = insetsBottom);
   }

   private void addGB(final Component component, final int gridx, final int gridy,
           final int gridwidth, final int gridheight,
           final int fill, final double weightx, final double weighty,
           final int anchor, final Insets insets) {
       addGB(component, gridx, gridy, gridwidth, gridheight, fill, weightx, weighty, anchor, insets, ipadx, ipady);
   }

   private void addGB(final Component component, final int gridx, final int gridy,
           final int gridwidth, final int gridheight,
           final int fill, final double weightx, final double weighty,
           final int anchor, final Insets insets,
           final int ipadx, final int ipady) {
       GridBagConstraints constraints = new GridBagConstraints();
       constraints.gridx = gridx;
       constraints.gridy = gridy;
       constraints.gridwidth = gridwidth;
       constraints.gridheight = gridheight;
       constraints.fill = fill;
       constraints.weightx = weightx;
       constraints.weighty = weighty;
       constraints.anchor = anchor;
       constraints.insets = insets;
       constraints.ipadx = ipadx;
       constraints.ipady = ipady;
       add(component, constraints);
   }

   private void initArgsGB() {
       gridx = 0;
       gridy = 0;
       gridwidth = 1;
       gridheight = 1;
       fill = NONE;
       weightx = 0.0;
       weighty = 0.0;
       anchor = CENTER;
       insets = new Insets(0, 0, 0, 0);
       ipadx = 0;
       ipady = 0;
   }

   public static void main(final String... args) {
       SwingUtilities.invokeLater(new Runnable() {

           @Override
           public void run() {
               JFrame frame = new JFrame("GridBagLayout Example");
               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               frame.setSize(300, 200);
               frame.setLocationRelativeTo(null);
               frame.setContentPane(new GridBagLayoutExample());
               frame.setVisible(true);
           }
       });
   }

} </code=java>