import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Point;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;

/**
 * Demonstrates an application of GridBagLayout to produce a Rectangle shape
 * properties editor.
 */
public class RectangleInfoFrame extends JFrame
{
  public static final Insets SURROUND_4 = new Insets(4, 4, 4, 4);

  private JButton fillColorButton;
  private JButton outlineColorButton;
  private JButton cancelButton;
  private JButton okButton;
  private JTextField xTextField;
  private JTextField yTextField;
  private JTextField widthTextField;
  private JTextField heightTextField;

  public RectangleInfoFrame()
  {
    super("Rectangle Info");
    JPanel cp = new JPanel(new GridBagLayout());
    setContentPane(cp);

    // Create components
    JLabel xCaption = new JLabel("X:");
    JLabel yCaption = new JLabel("Y:");
    JLabel widthCaption = new JLabel("Width:");
    JLabel heightCaption = new JLabel("Height:");
    JLabel colorsCaption = new JLabel("Colors:");

    this.xTextField = new JTextField(10);
    this.yTextField = new JTextField(10);
    this.widthTextField = new JTextField(10);
    this.heightTextField = new JTextField(10);

    this.outlineColorButton = new JButton("Outline");
    this.fillColorButton = new JButton("Fill");
    this.cancelButton = new JButton("Cancel");
    this.okButton = new JButton("OK");

    // Set up x,y row
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.insets = SURROUND_4;
    gbc.gridy = 1;
    gbc.gridx = 1;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    cp.add(xCaption, gbc);
    gbc.gridx = 3;
    cp.add(yCaption, gbc);
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.gridx = 2;
    cp.add(this.xTextField, gbc);
    gbc.gridx = 4;
    cp.add(this.yTextField, gbc);

    // Set up width row
    gbc.gridy++;
    gbc.gridx = 1;
    gbc.gridwidth = 1;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    cp.add(widthCaption, gbc);
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.gridx = 2;
    gbc.gridwidth = 3;
    cp.add(this.widthTextField, gbc);

    // Set up height row
    gbc.gridy++;
    gbc.gridx = 1;
    gbc.gridwidth = 1;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    cp.add(heightCaption, gbc);
    gbc.anchor = GridBagConstraints.WEST;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.gridx = 2;
    gbc.gridwidth = 3;
    cp.add(this.heightTextField, gbc);

    // Set up colors row
    JPanel colorsPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
    colorsPanel.add(this.outlineColorButton);
    colorsPanel.add(this.fillColorButton);

    gbc.gridy++;
    gbc.gridx = 1;
    gbc.gridwidth = 1;
    gbc.anchor = GridBagConstraints.EAST;
    gbc.fill = GridBagConstraints.NONE;
    cp.add(colorsCaption, gbc);
    gbc.anchor = GridBagConstraints.WEST;
    gbc.gridx = 2;
    gbc.gridwidth = 3;
    gbc.insets = new Insets(0, 0, 0, 0);
    cp.add(colorsPanel, gbc);

    // Set up exit buttons row
    JPanel buttonsPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
    buttonsPanel.add(this.cancelButton);
    buttonsPanel.add(this.okButton);

    gbc.gridy++;
    gbc.gridx = 1;
    gbc.gridwidth = 4;
    gbc.anchor = GridBagConstraints.EAST;
    cp.add(buttonsPanel, gbc);

    getRootPane().setDefaultButton(this.okButton);

    pack();
  }

  public void center()
  {
    Dimension screenSize = getToolkit().getScreenSize();
    Dimension frameSize = getSize();
    Point location = new Point((screenSize.width - frameSize.width) / 2,
      (screenSize.height - frameSize.height) / 2);
    setLocation(location);
  }

  public static void main(String[] args) throws Exception
  {
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    JFrame.setDefaultLookAndFeelDecorated(true);

    RectangleInfoFrame f = new RectangleInfoFrame();
    f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    f.center();
    f.setVisible(true);
  }
}