source: josm/src/org/openstreetmap/josm/gui/PreferenceDialog.java@ 1

package org.openstreetmap.josm.gui;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.File;

import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.DefaultListCellRenderer;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;

import org.openstreetmap.josm.data.Preferences;
import org.openstreetmap.josm.data.Preferences.PreferencesException;
import org.openstreetmap.josm.data.projection.Projection;

/**
 * The preference settings.
 *
 * @author imi
 */
public class PreferenceDialog extends JDialog {

        /**
         * Action to take place when user pressed the ok button.
         */
        class OkAction extends AbstractAction {
                public OkAction() {
                        super("Ok", new ImageIcon("images/ok.png"));
                        putValue(MNEMONIC_KEY, KeyEvent.VK_ENTER);
                }
                public void actionPerformed(ActionEvent e) {
                        Preferences pref = new Preferences();
                        pref.laf = (LookAndFeelInfo)lafCombo.getSelectedItem();
                        pref.projection = (Projection)projectionCombo.getSelectedItem();
                        Main.pref.projection = pref.projection;
                        try {
                                pref.save();
                        } catch (PreferencesException x) {
                                x.printStackTrace();
                                JOptionPane.showMessageDialog(PreferenceDialog.this, "Could not save preferences:\n"+x.getMessage());
                        }
                        if (requiresRestart)
                                JOptionPane.showMessageDialog(PreferenceDialog.this, "You have to restart JOSM for some settings to take effect.");
                        setVisible(false);
                }
        }

        /**
         * Action to take place when user pressed the cancel button.
         */
        class CancelAction extends AbstractAction {
                public CancelAction() {
                        super("Cancel", new ImageIcon("images/cancel.png"));
                        putValue(MNEMONIC_KEY, KeyEvent.VK_ESCAPE);
                }
                public void actionPerformed(ActionEvent e) {
                        setVisible(false);
                }
        }

        /**
         * Indicate, that the application has to be restarted for the settings to take effect.
         */
        private boolean requiresRestart = false;
        /**
         * ComboBox with all look and feels.
         */
        private JComboBox lafCombo = new JComboBox(UIManager.getInstalledLookAndFeels());
        /**
         * The tabbed pane to add tabulars to.
         */
        private JTabbedPane tabPanel = new JTabbedPane();
        /**
         * Combobox with all projections available
         */
        private JComboBox projectionCombo = new JComboBox(Preferences.allProjections);

        
        /**
         * Create a preference setting dialog from an preferences-file. If the file does not
         * exist, it will be created.
         * If the dialog is closed with Ok, the preferences will be stored to the preferences-
         * file, otherwise no change of the file happens.
         */
        public PreferenceDialog() {
                super(Main.main, "Preferences");

                Preferences pref = new Preferences();
                try {
                        if (new File(Preferences.getPreferencesFile()).exists())
                                pref.load();
                } catch (PreferencesException e) {
                        JOptionPane.showMessageDialog(Main.main, "Preferences settings could not be parsed:\n"+e.getMessage());
                        e.printStackTrace();
                        return;
                }

                getContentPane().setLayout(new BorderLayout());
                getContentPane().add(tabPanel, BorderLayout.CENTER);

                newTab("Display");
                // laf
                JPanel p = newPanelLine();
                p.add(new JLabel("Look and Feel"));
                final ListCellRenderer oldRenderer = lafCombo.getRenderer();
                lafCombo.setRenderer(new DefaultListCellRenderer(){
                        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
                                return oldRenderer.getListCellRendererComponent(list, ((LookAndFeelInfo)value).getName(), index, isSelected, cellHasFocus);
                        }});
                lafCombo.setSelectedItem(pref.laf);
                lafCombo.addActionListener(new ActionListener(){
                        public void actionPerformed(ActionEvent e) {
                                setRequiresRestart();
                        }});
                p.add(lafCombo);

                newTab("Projection");
                p = newPanelLine();
                p.add(new JLabel("Projection System"));
                p.add(projectionCombo);
                for (int i = 0; i < projectionCombo.getItemCount(); ++i)
                        if (projectionCombo.getItemAt(i).getClass().equals(pref.projection.getClass())) {
                                projectionCombo.setSelectedIndex(i);
                                break;
                        }

                // OK/Cancel
                JPanel okPanel = new JPanel();
                okPanel.add(new JButton(new OkAction()));
                okPanel.add(new JButton(new CancelAction()));
                getContentPane().add(okPanel, BorderLayout.SOUTH);

                setModal(true);
                pack();
                Dimension s = Main.main.getSize();
                setLocation(s.width/2-getWidth()/2, s.height/2-getHeight()/2);
        }

        /**
         * Start a new tab with the given name
         * @param tabName The name of the new tab.
         */
        private void newTab(String tabName) {
                Box tab = Box.createVerticalBox();
                tab.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
                tabPanel.addTab(tabName, tab);
        }

        /**
         * Remember, that the settings made requires a restart of the application.
         * Called from various actionListener - classes
         */
        protected void setRequiresRestart() {
                requiresRestart = true;
        }

        private JPanel newPanelLine() {
                JPanel p;
                p = new JPanel();
                p.setBorder(BorderFactory.createEmptyBorder(5,0,0,0));
                ((Container)tabPanel.getComponent(tabPanel.getTabCount()-1)).add(p);
                return p;
        }
}