/*

 * Title: japlot.jaxodraw
 * Description: Graphical user interface for drawing Feynman diagrams
 * @author Daniele Binosi 
 * @author Lukas Theussl  

 Copyright (C) 2003-2006,  Daniele Binosi and Lukas Theussl

 See the file LICENSE in the source distribution home directory
 for a full copy of the GPL (GNU General Public License).

    This file is part of japlot.jaxodraw.

    japlot.jaxodraw is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    japlot.jaxodraw is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 */
package japlot.jaxodraw;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.util.ResourceBundle;

import javax.swing.ButtonGroup;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.LookAndFeel;
import javax.swing.UIManager;


/** Responsible for choosing the Look and Feel of japlot.jaxodraw. */
public class JaxoLooknFeel {
    private ResourceBundle language =
        ResourceBundle.getBundle(JaxoPrefs.getPref(JaxoPrefs.PREF_LANGUAGE));
    private JRadioButton[] lookAndFeelRB;
    private JPanel lafPanel;

    /** Brings up a dialog to select a Look and Feel. */
    public JaxoLooknFeel() {
        String currentLookAndFeel = UIManager.getLookAndFeel().getName();
        LookAndFeel thisLaF = UIManager.getLookAndFeel();

        ButtonGroup group = new ButtonGroup();
        lafPanel = new JPanel(false);

        // Get the names of available look and feels
        UIManager.LookAndFeelInfo[] info =
            UIManager.getInstalledLookAndFeels();
        int num = info.length;
        String[] humanReadableName = new String[num];
        String[] className = new String[num];
        lookAndFeelRB = new JRadioButton[num];

        RadioListener myListener = new RadioListener();

        for (int i = 0; i < num; i++) { // create a Radiobutton for each of them
            humanReadableName[i] = info[i].getName();
            className[i] = info[i].getClassName();
            lookAndFeelRB[i] = new JRadioButton(humanReadableName[i]);

            try { // check wether this LaF is supported
                javax.swing.UIManager.setLookAndFeel(className[i]);
            } catch (Exception exc) {
                lookAndFeelRB[i].setEnabled(false);
            }

            try {
                javax.swing.UIManager.setLookAndFeel(thisLaF);
            } catch (Exception exc) {
                // this should work in any case
                if (JaxoPrefs.verbose()) {
                    System.err.println(exc);
                }
            }

            lafPanel.add(lookAndFeelRB[i]);
            group.add(lookAndFeelRB[i]);
            lookAndFeelRB[i].setActionCommand(humanReadableName[i]);
            lookAndFeelRB[i].addActionListener(myListener);

            if (humanReadableName[i].equals(currentLookAndFeel)) {
                lookAndFeelRB[i].setSelected(true);
            }
        }

        String[] optionButtonNames = {language.getString("OK")};
        JOptionPane.showOptionDialog(null, lafPanel,
            language.getString("Look_And_Feel"), JOptionPane.DEFAULT_OPTION,
            JOptionPane.INFORMATION_MESSAGE, null, optionButtonNames,
            optionButtonNames[0]);
    }

    /** Makes the changes visible on the screen. */
    public final void updateState() {
        String lnfName = UIManager.getLookAndFeel().getClass().getName();
        UIManager.LookAndFeelInfo[] info =
            UIManager.getInstalledLookAndFeels();
        int num = info.length;

        for (int i = 0; i < num; i++) {
            if (lnfName.equals(info[i].getClassName())) {
                lookAndFeelRB[i].setSelected(true);
            }
        }
    }

    class RadioListener implements ActionListener {
        public final void actionPerformed(ActionEvent e) {
            UIManager.LookAndFeelInfo[] info =
                UIManager.getInstalledLookAndFeels();
            int num = info.length;
            String[] humanReadableName = new String[num];
            String[] className = new String[num];
            String chosen = e.getActionCommand();
            String newLAF = "";
            String newLAFname = "";

            for (int i = 0; i < num; i++) {
                humanReadableName[i] = info[i].getName();
                className[i] = info[i].getClassName();

                if (chosen.equals(humanReadableName[i])) {
                    newLAF = className[i];
                    newLAFname = humanReadableName[i];
                }
            }

            try {
                JaxoPrefs.setPref(JaxoPrefs.PREF_LOOKNFEEL, newLAFname);
                UIManager.setLookAndFeel(newLAF);
            } catch (Exception exc) {
                JRadioButton button = (JRadioButton) e.getSource();
                button.setEnabled(false);
                updateState();

                if (JaxoPrefs.verbose()) {
                    System.err.println(exc);
                }

                JOptionPane.showMessageDialog(lafPanel,
                    newLAFname
                    + language.getString(
                        "_Look_and_Feel_is_not_supported_on_this_platform!"));
            }
        }
    }
}