code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2016 Daniel Naber (http://www.danielnaber.de)
   * 
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library 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
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.gui;
  
  import java.awt.Color;
  import java.awt.ComponentOrientation;
  import java.awt.GridBagConstraints;
  import java.awt.GridBagLayout;
  import java.awt.Insets;
  import java.awt.event.ItemEvent;
  import java.awt.event.ItemListener;
  import java.util.Locale;
  import java.util.ResourceBundle;
  import javax.swing.BorderFactory;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import org.languagetool.Languages;
  
  /**
   * A panel for selecting the GUI language, can be embedded to the main Configuration Dialog
   *
   * @author Panagiotis Minos
   * @since 3.4
   */
  class GuiLangConfigPanel extends JPanel implements SavablePanel, ItemListener {
  
    private final LocalStorage storage;
    private final ResourceBundle messages;
    private final LanguageComboBox languageBox;
    private final LanguageAdapter system;
    private final JLabel needsRestartLabel = new JLabel("");
    private boolean needsRestart = false;
    private LanguageAdapter guiLang = null;
  
    GuiLangConfigPanel(ResourceBundle messages, LocalStorage storage) {
      super(new GridBagLayout());
      applyComponentOrientation(
        ComponentOrientation.getOrientation(Locale.getDefault()));
      setBorder(BorderFactory.createTitledBorder(messages.getString("guiLanguage")));
      this.messages = messages;    
      this.storage = storage;
      system = new LanguageAdapter(messages.getString("guiLanguageSystem"));
      //create a ComboBox with flags, do not include hidden languages,
      //use system as first option
      languageBox = LanguageComboBox.create(messages, "", true, false, system);
  
      GridBagConstraints c = new GridBagConstraints();
      c.insets = new Insets(2, 2, 2, 2);
      c.gridx = 0;
      c.gridy = 0;
      c.weightx = 1;
      c.anchor = GridBagConstraints.LINE_START;
      add(languageBox, c);
      c.gridy = 1;
      c.fill = GridBagConstraints.HORIZONTAL;
      add(needsRestartLabel, c);
    }
  
    @Override
    public void itemStateChanged(ItemEvent e) {
      if (e.getStateChange() == ItemEvent.SELECTED) {
        guiLang = (LanguageAdapter) e.getItem();
        needsRestartLabel.setText(messages.getString("quiLanguageNeedsRestart"));
        needsRestartLabel.setForeground(Color.red);      
      }
    }
  
    @Override
    public void componentShowing() {
      languageBox.removeItemListener(this);
      loadOption();
      languageBox.addItemListener(this);
    }
  
    @Override
    public void save() {
      if (guiLang == null) {
        return;
      }
      needsRestart = true;    
      if (guiLang.getLanguage() != null) {
        storage.saveProperty("gui.locale", new LocaleBean(
                guiLang.getLanguage().getLocaleWithCountryAndVariant()));
      } else {
        storage.saveProperty("gui.locale", null);
      }
    }
  
    private void loadOption() {
      guiLang = null;
      if (!needsRestart) {
        needsRestartLabel.setText("");
      }    
      LocaleBean lang = storage.loadProperty("gui.locale", LocaleBean.class);
      if (lang != null) {
        Locale l = lang.asLocale();
        languageBox.selectLanguage(Languages.getLanguageForLocale(l));
      } else {
        languageBox.setSelectedItem(system);
      }
    }
  }
  