package swingExamples;

import java.awt.Color;
import java.awt.Container;

import java.awt.event.KeyEvent;
import java.awt.event.ActionEvent;
import java.net.MalformedURLException;
import java.net.URL;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.JButton;

class ColorChangePanel extends JPanel
{
  public ColorChangePanel(ColorChangeFrame frame)
  {
    setBackground(Color.lightGray);
    
    // Set up the color actions for yellow, blue and red
    setupActions();
    
    // Add the buttons to the panel
    add( new ActionButton(m_yellowAction) );
    add( new ActionButton(m_blueAction) );
    add( new ActionButton(m_redAction) );
    
    // Register keyboard actions for each color
    registerKeyboardAction(m_yellowAction,
        KeyStroke.getKeyStroke(KeyEvent.VK_Y, 0),
        JComponent.WHEN_IN_FOCUSED_WINDOW);
    registerKeyboardAction(m_blueAction,
        KeyStroke.getKeyStroke(KeyEvent.VK_B, 0),
        JComponent.WHEN_IN_FOCUSED_WINDOW);
    registerKeyboardAction(m_redAction,
        KeyStroke.getKeyStroke(KeyEvent.VK_R, 0),
        JComponent.WHEN_IN_FOCUSED_WINDOW);
    
    // Create menu bar with menu of color actions
    JMenu menu = new JMenu("Color");
    menu.add(m_yellowAction);
    menu.add(m_blueAction);
    menu.add(m_redAction);
    JMenuBar menuBar = new JMenuBar();
    menuBar.add(menu);
    // Add the menu bar to the panel's frame.
    frame.setJMenuBar(menuBar);
  }
  
  /**
   * Set up the three color actions
   */
  private void setupActions()
  {
    // Find the images relative to the current class
    Class baseClass = ColorChangePanel.class;
    URL url = baseClass.getResource("../images/yellow-ball.gif");
    m_yellowAction =
        new ColorAction(
            "Yellow",
            new ImageIcon(url),
            Color.YELLOW
            );
    url = baseClass.getResource("../images/blue-ball.gif");
    m_blueAction =
        new ColorAction(
            "Blue",
            new ImageIcon(url),
            Color.BLUE
            );
    url = baseClass.getResource("../images/red-ball.gif");
    m_redAction =
        new ColorAction(
            "Red",
            new ImageIcon(url),
            Color.RED
            );
  }
  
  //////// Private data ///////
  private Action m_yellowAction;
  private Action m_blueAction;
  private Action m_redAction;
  
  //////// Inner class ////////
  class ColorAction extends AbstractAction
  {
    public ColorAction(String name, Icon icon, Color color)
    {
      putValue(Action.NAME, name);
      putValue(Action.SMALL_ICON, icon);
      putValue(Action.SHORT_DESCRIPTION,
          "Set panel color to " + name.toLowerCase());
      putValue("color", color);
    }
    
    public void actionPerformed(ActionEvent ev)
    {
      Color color = (Color) getValue("color");
      setBackground(color);
    }
  }
  
  //////// Inner class ///////
  class ActionButton extends JButton
  {
    public ActionButton(Action action)
    {
      setText( (String) action.getValue(Action.NAME));
      Icon icon = (Icon) action.getValue(Action.SMALL_ICON);
      if (icon != null)
      {
        setIcon(icon);
      }
      addActionListener(action);
    }
  }
}

class ColorChangeFrame extends JFrame
{
  public ColorChangeFrame()
  {
    setTitle("ColorChange");
    setSize(300, 200);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    
    // Add panel to frame
    JPanel panel = new ColorChangePanel(this);
    Container contentPane = getContentPane();
    contentPane.add(panel);
  }
}

public class ColorChangeActions
{
  public static void main(String[] args)
  {
    ColorChangeFrame frame = new ColorChangeFrame();
    frame.setVisible(true);
  }
}