/*

    File:       SwapLAF.java

    Abstract:   Main class/logic for SwapLAF sample. See updateLookAndFeel() for main logic.

    Version:    1.3

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*/

package apple.dts.samplecode.swaplaf;

import java.awt.*;

import java.util.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import com.apple.mrj.*;

import javax.swing.*;

public class SwapLAF extends JFrame

                      implements  ActionListener,

                                  MRJAboutHandler,

                                  MRJQuitHandler

{

    static final String APP_TITLE = "SwapLAF";

    static final String HELLO = "Hello World!";

    static final String BUTTON_TEXT = "Sample Button";

    static final String LAF = "Look-And-Feel";

    static final String FONT_LABEL = "Label.font";

    protected JMenu LAFMenu;

    protected JMenuItem currentSelection, previousSelection;

    protected ButtonGroup LAFGroup;

    protected JLabel label;

    protected JMenuBar mainMenuBar = new JMenuBar();

    protected JButton sampleButton = new JButton(BUTTON_TEXT);

    protected AboutBox aboutBox;

    protected HashMap installedLAFs;        

    public SwapLAF() {

        super(APP_TITLE);

        UIManager.LookAndFeelInfo[] plafs = UIManager.getInstalledLookAndFeels();

        installedLAFs = new HashMap(plafs.length);

        for (int i = 0; i < plafs.length; i++){

            installedLAFs.put(plafs[i].getName(), plafs[i].getClassName());

        }

        Container c = getContentPane();

        c.setLayout(new BorderLayout());

        LAFGroup = new ButtonGroup();

        setUpLAFMenu();

        setJMenuBar(mainMenuBar);

        JPanel bottom = new JPanel(new FlowLayout(FlowLayout.CENTER, 20, 20));

        bottom.add(sampleButton);

        c.add(bottom, BorderLayout.SOUTH);

        label = new JLabel(getMessage(), JLabel.CENTER);

        label.setFont(label.getFont().deriveFont(36f));

        c.add(label);

        Toolkit.getDefaultToolkit();

        MRJApplicationUtils.registerAboutHandler(this);

        MRJApplicationUtils.registerQuitHandler(this);

        setSize(400,180);

        setLocation(200,200);

        setVisible(true);

    }

    public void setUpLAFMenu() {

        LAFMenu = new JMenu(LAF);

        Iterator LAFNames = installedLAFs.keySet().iterator();

        while (LAFNames.hasNext()) {

            String name = (String)LAFNames.next();

            JRadioButtonMenuItem jmi = new JRadioButtonMenuItem(name);

            LAFMenu.add(jmi);

            LAFGroup.add(jmi);

            jmi.addActionListener(this);

            if (installedLAFs.get(name).equals(UIManager.getLookAndFeel().getClass().getName())) {

                jmi.setSelected(true);

                currentSelection = jmi;

            }

        }

        mainMenuBar.add(LAFMenu);

    }

    public String getMessage() {

        String lafName = UIManager.getLookAndFeel().getName();

        if (lafName != null) {

            return "This is " + lafName;

        } else {

            return HELLO;

        }

    }

    public void handleAbout() {

        // create a new AboutBox every time to work around

        // refresh latencies when changing LAF

        aboutBox = new AboutBox(this);

        aboutBox.show();

    }

    public void handleQuit() {  

        System.exit(0);

    }

    // ActionListener interface (for menus)

    public void actionPerformed(ActionEvent newEvent) {

        previousSelection = currentSelection;

        currentSelection = (JMenuItem)newEvent.getSource();

        String name = currentSelection.getText();

        String className = (String) installedLAFs.get(name);

        if (className != null) {

            try {

                updateLookAndFeel(name, className);

            } catch (Exception e) {

                System.out.println("Uh-oh..." + e);

            }

        }

    }

    /** 

     *  Change the look-and-feel to the specified class.

     *  Alert the user if there were problems loading the PLAF.

     *  @param name (String) the presentable name for the class

     *  @param className (String) the className to be fed to the UIManager

     *  @see javax.swing.UIManager#setLookAndFeel

     *  @see javax.swing.SwingUtilities#updateComponentTreeUI

     */ 

    public void updateLookAndFeel(String name, String className) {

    try {

            // Set the new look and feel, and update the sample message to reflect it.

        UIManager.setLookAndFeel(className);

            label.setText(getMessage());

            // Grab the font from the LAF's defaults hash to use for the sample message

            label.setFont(((Font)UIManager.getLookAndFeel().getDefaults().get(FONT_LABEL)).deriveFont(36f));

            // Call for a UI refresh to the new LAF starting at the highest level

            SwingUtilities.updateComponentTreeUI(this);

        } catch (Exception e) {

            String errMsg = "The " + name + " look-and-feel ";

            if (e instanceof UnsupportedLookAndFeelException){

                errMsg += "is not supported on this platform.";

            } else if (e instanceof ClassNotFoundException){

                errMsg += "could not be found.";

            } else {

                errMsg += "could not be loaded.";

                System.out.println(e);

            }

            currentSelection = previousSelection;

            currentSelection.setSelected(true);

            JOptionPane.showMessageDialog(this, errMsg, APP_TITLE, JOptionPane.ERROR_MESSAGE);

        }

    }

    public static void main(String args[]) {

        new SwapLAF();

    }

}