package swingExamples;

/**
 * A class to show an example of a SpringLayout.
 *
 * @version 1.01 2004-05-06
 * @author Cay Horstmann, modified by Bryan Higgs
 */

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.Spring;
import javax.swing.SpringLayout;

/**
 * A frame that uses a spring layout to arrange font
 * selection components.
 */
class FontDialogFrame extends JFrame
{
  public FontDialogFrame()
  {
    setTitle("FontDialog");
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
    
    JPanel panel = new JPanel();
    SpringLayout layout = new SpringLayout();
    panel.setLayout(layout);
    
    ActionListener listener = new FontAction();
    
    // construct components
    JLabel faceLabel = new JLabel("Font Face: ");
    
    face = new JComboBox(
        new String[]
        {
          "Serif", "SansSerif", "Monospaced",
          "Dialog", "DialogInput"
        }
    );
    face.addActionListener(listener);
    
    JLabel sizeLabel = new JLabel("Size: ");
    
    size = new JComboBox(
        new String[]
        {
          "8", "10", "12", "15", "18", 
          "24", "36", "48"
        }
    );
    
    size.addActionListener(listener);
    
    bold = new JCheckBox("Bold");
    bold.addActionListener(listener);
    
    italic = new JCheckBox("Italic");
    italic.addActionListener(listener);
    
    sample = new JTextArea();
    sample.setText(
        "The quick brown fox jumps over the lazy dog");
    sample.setEditable(false);
    sample.setLineWrap(true);
    sample.setBorder(
        BorderFactory.createEtchedBorder());
    
    panel.add(faceLabel);
    panel.add(sizeLabel);
    panel.add(face);
    panel.add(size);
    panel.add(bold);
    panel.add(italic);
    panel.add(sample);
    
    // add springs to lay out components
    Spring strut = Spring.constant(10);
    
    Spring labelsEast = Spring.sum(strut,
        Spring.max(
        layout.getConstraints(faceLabel).getWidth(),
        layout.getConstraints(sizeLabel).getWidth()));
    
    layout.putConstraint(
        SpringLayout.EAST, 
        faceLabel, labelsEast, SpringLayout.WEST, panel);
    layout.putConstraint(
        SpringLayout.EAST, 
        sizeLabel, labelsEast, SpringLayout.WEST, panel);
    
    layout.putConstraint(
        SpringLayout.NORTH, 
        faceLabel, strut, SpringLayout.NORTH, panel);
    layout.putConstraint(
        SpringLayout.NORTH, 
        face, strut, SpringLayout.NORTH, panel);
    
    Spring secondRowNorth = 
        Spring.sum(strut,
                   Spring.max(
                      layout.getConstraint(
                          SpringLayout.SOUTH, faceLabel),
                      layout.getConstraint(
                          SpringLayout.SOUTH, face)
                      )
                   );
    
    layout.putConstraint(
        SpringLayout.NORTH, 
        sizeLabel, secondRowNorth, SpringLayout.NORTH, panel);
    layout.putConstraint(
        SpringLayout.NORTH, 
        size, secondRowNorth, SpringLayout.NORTH, panel);
    
    layout.putConstraint(
        SpringLayout.WEST, 
        face, strut, SpringLayout.EAST, faceLabel);
    layout.putConstraint(
        SpringLayout.WEST, 
        size, strut, SpringLayout.EAST, sizeLabel);
    
    layout.putConstraint(
        SpringLayout.WEST, 
        bold, strut, SpringLayout.WEST, panel);
    layout.putConstraint(
        SpringLayout.WEST, 
        italic, strut, SpringLayout.WEST, panel);
    
    Spring s = Spring.constant(10, 10000, 10000);
    
    Spring thirdRowNorth = 
        Spring.sum(s,
                   Spring.max(
                      layout.getConstraint(
                        SpringLayout.SOUTH, sizeLabel),
                      layout.getConstraint(
                        SpringLayout.SOUTH, size)
                      )
                  );
    
    layout.putConstraint(
        SpringLayout.NORTH, 
        bold, thirdRowNorth, SpringLayout.NORTH, panel);
    layout.putConstraint(
        SpringLayout.NORTH, 
        italic, s, SpringLayout.SOUTH, bold);
    layout.putConstraint(
        SpringLayout.SOUTH, 
        panel, s, SpringLayout.SOUTH, italic);
    
    Spring secondColumnWest = 
        Spring.sum(strut,
                   Spring.max(
                      layout.getConstraint(
                        SpringLayout.EAST, face),
                      layout.getConstraint(
                        SpringLayout.EAST, size)
                      )
                   );
    
    layout.putConstraint(
        SpringLayout.WEST, 
        sample, secondColumnWest, SpringLayout.WEST, panel);
    layout.putConstraint(
        SpringLayout.SOUTH, 
        sample, Spring.minus(strut), SpringLayout.SOUTH, panel);
    layout.putConstraint(
        SpringLayout.NORTH, 
        sample, strut, SpringLayout.NORTH, panel);
    layout.putConstraint(
        SpringLayout.EAST, 
        panel, strut, SpringLayout.EAST, sample);
    
    add(panel);
  }
  
  ///// Private data ////
  private static final int DEFAULT_WIDTH = 400;
  private static final int DEFAULT_HEIGHT = 200;
  
  private JComboBox face;
  private JComboBox size;
  private JCheckBox bold;
  private JCheckBox italic;
  private JTextArea sample;
  
  /**
   * An action listener that changes the font of the
   * sample text.
   */
  private class FontAction implements ActionListener
  {
    public void actionPerformed(ActionEvent event)
    {
      String fontFace = (String) face.getSelectedItem();
      int fontStyle = (bold.isSelected() ? Font.BOLD : 0)
      + (italic.isSelected() ? Font.ITALIC : 0);
      int fontSize = Integer.parseInt(
                        (String) size.getSelectedItem());
      Font font = new Font(fontFace, fontStyle, fontSize);
      sample.setFont(font);
      sample.repaint();
    }
  }
}

public class SpringLayoutExample
{
  public static void main(String[] args)
  {
    FontDialogFrame frame = new FontDialogFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}