/*
    * Copyright 2002 - 2007 JEuclid, http://jeuclid.sf.net
    * 
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /* $Id: FontSelectionDialog.java,v 503f7e4f22db 2008/04/28 12:43:00 maxberger $ */
  
  package net.sourceforge.jeuclid.app.mathviewer;
  
  import java.awt.BorderLayout;
  import java.awt.Dialog;
  import java.awt.FlowLayout;
  import java.awt.Font;
  import java.awt.Frame;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Vector;
  
  import javax.swing.JButton;
  import javax.swing.JDialog;
  import javax.swing.JLabel;
  import javax.swing.JList;
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  import javax.swing.JTextArea;
  import javax.swing.ScrollPaneConstants;
  import javax.swing.WindowConstants;
  import javax.swing.event.ListSelectionEvent;
  import javax.swing.event.ListSelectionListener;
  
  import net.sourceforge.jeuclid.font.FontFactory;
  
  /**
   * Dialog that lets user select one or more fonts available in the system.
   * 
   * @version $Revision: 503f7e4f22db $
   */
  // CHECKSTYLE:OFF
  public class FontSelectionDialog extends JDialog {
      // CHECKSTYLE:ON
  
      private static final int SAMPLE_FONTSIZE = 14;
  
      /**
       * 
       */
      private static final long serialVersionUID = 1L;
  
      private static final String PREVIEW_TEXT = "The quick brown fox jumps over the lazy dog. 123456790";
  
      private final List<String> fontNames = new ArrayList<String>();
  
      private JList list;
  
      /**
       * Default Constructor.
       * 
       * @param parent
       *            parent dialog
       * @param currentFontNames
       *            font names to select initially
       */
      public FontSelectionDialog(final Dialog parent,
              final List<String> currentFontNames) {
          super(parent);
          this.init(currentFontNames);
      }
  
      /**
       * Default Constructor.
       * 
       * @param parent
       *            parent frame
       * @param currentFontNames
       *            font names to select initially
       */
      public FontSelectionDialog(final Frame parent,
              final List<String> currentFontNames) {
          super(parent);
          this.init(currentFontNames);
      }
  
      private void init(final List<String> currentFontNames) {
          this.setTitle(Messages
                  .getString("MathViewer.FontSelectionDialog.title"));
         this.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
         this
                 .getContentPane()
                 .add(
                         new JLabel(
                                 Messages
                                         .getString("MathViewer.FontSelectionDialog.topLabel")),
                         BorderLayout.NORTH);
         this.setupFontsList(currentFontNames);
         this.setupButtons();
         this.pack();
         this.setLocationByPlatform(true);
         this.setModal(true);
     }
 
     /**
      * @return selected font names if OK was pressed to close the dialog
      */
     public List<String> getFontNames() {
         return this.fontNames;
     }
 
     private void setupFontsList(final List<String> currentFontNames) {
         // CHECKSTYLE:OFF
         // Vector is a must because JList requires it.
         final Vector<String> allFonts = new Vector<String>(FontFactory
                 .getInstance().listFontNames());
         // CHECKSTYLE:ON
         Collections.sort(allFonts);
         this.list = new JList(allFonts);
         final List<Integer> selectedIndicies = new ArrayList<Integer>();
         if (currentFontNames != null && !currentFontNames.isEmpty()) {
             for (final String value : currentFontNames) {
                 final int i = Collections.binarySearch(allFonts, value);
                 if (i > -1) {
                     selectedIndicies.add(i);
                 }
             }
         }
         final int[] selectedIndiciesArr = new int[selectedIndicies.size()];
         for (int i = 0; i < selectedIndiciesArr.length; i++) {
             selectedIndiciesArr[i] = selectedIndicies.get(i);
         }
         this.list.setSelectedIndices(selectedIndiciesArr);
         final JScrollPane scrollPane = new JScrollPane(this.list,
                 ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                 ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
         final JTextArea preview = new JTextArea(
                 FontSelectionDialog.PREVIEW_TEXT);
         this.list.addListSelectionListener(new ListSelectionListener() {
             public void valueChanged(final ListSelectionEvent e) {
                 preview.setFont(FontFactory.getInstance().getFont(
                         (String) FontSelectionDialog.this.list
                                 .getSelectedValue(), Font.PLAIN,
                         FontSelectionDialog.SAMPLE_FONTSIZE));
                 preview.revalidate();
             }
         });
         this.getContentPane().add(scrollPane, BorderLayout.WEST);
         this.getContentPane().add(preview, BorderLayout.CENTER);
     }
 
     private void setupButtons() {
         final JPanel buttonsPanel = new JPanel(new FlowLayout(
                 FlowLayout.CENTER));
         final JButton btnOK = new JButton(Messages.getString("MathViewer.ok"));
         btnOK.setMnemonic('O');
         final ActionListener actionListener = new ActionListener() {
             public void actionPerformed(final ActionEvent e) {
                 if (e.getSource() == btnOK) {
                     for (Object val : FontSelectionDialog.this.list
                             .getSelectedValues()) {
                         FontSelectionDialog.this.fontNames.add((String) val);
                     }
                 }
                 FontSelectionDialog.this.dispose();
             }
         };
         btnOK.addActionListener(actionListener);
         buttonsPanel.add(btnOK);
         final JButton btnCancel = new JButton(Messages
                 .getString("MathViewer.cancel"));
         btnCancel.setMnemonic('C');
         btnCancel.addActionListener(actionListener);
         buttonsPanel.add(btnCancel);
         this.getContentPane().add(buttonsPanel, BorderLayout.SOUTH);
     }
 
 }