/*
* JOrtho
*
* Copyright (C) 2005-2008 by i-net software
*
* This program 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.
*
* This program 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.
*
* Created on 05.11.2005
*/
package com.inet.jortho;
import java.util.Locale;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.text.Highlighter.Highlight;
/**
* This class check a <code>JTextComponent</code> automatically (in the background) for orthography. Spell error are
* highlighted with a red zigzag line.
*
* @author Volker Berlin
*/
class AutoSpellChecker implements DocumentListener, LanguageChangeListener {
private static final RedZigZagPainter painter = new RedZigZagPainter();
private final JTextComponent jText;
private final SpellCheckerOptions options;
private Dictionary dictionary;
private Locale locale;
public AutoSpellChecker(JTextComponent text, SpellCheckerOptions options){
this.jText = text;
this.options = options == null ? SpellChecker.getOptions() : options;
jText.getDocument().addDocumentListener( this );
SpellChecker.addLanguageChangeLister( this );
dictionary = SpellChecker.getCurrentDictionary();
locale = SpellChecker.getCurrentLocale();
checkAll();
}
/**
* Remove the AutoSpellChecker from the given JTextComponent.
*
* @param text
* the JTextComponent
*/
static void disable( JTextComponent text ){
AbstractDocument doc = (AbstractDocument)text.getDocument();
for(DocumentListener listener : doc.getDocumentListeners()){
if(listener instanceof AutoSpellChecker){
AutoSpellChecker autoSpell = (AutoSpellChecker)listener;
doc.removeDocumentListener( autoSpell );
Highlighter highlighter = text.getHighlighter();
for( Highlight highlight : highlighter.getHighlights() ) {
if( highlight.getPainter() == painter ){
highlighter.removeHighlight( highlight );
}
}
}
}
}
/**
* Refresh the highlighting. This can be useful if the dictionary was modify.
*
* @param text
* the JTextComponent
*/
static void refresh( JTextComponent text ){
AbstractDocument doc = (AbstractDocument)text.getDocument();
for(DocumentListener listener : doc.getDocumentListeners()){
if( listener instanceof AutoSpellChecker ){
AutoSpellChecker autoSpell = (AutoSpellChecker)listener;
autoSpell.checkAll();
}
}
}
/*====================================================================
*
* Methods of interface DocumentListener
*
*===================================================================*/
/**
* {@inheritDoc}
*/
public void changedUpdate( DocumentEvent ev ) {
//Nothing
}
/**
* {@inheritDoc}
*/
public void insertUpdate( DocumentEvent ev ) {
checkElements( ev.getOffset(), ev.getLength() );
}
/**
* {@inheritDoc}
*/
public void removeUpdate( DocumentEvent ev ) {
checkElements( ev.getOffset(), 0 );
}
/**
* Check the Elements on the given position.
*/
private void checkElements( int offset, int length ) {
int end = offset + length;
Document document = jText.getDocument();
Element element;
do{
try {
// We need to use a ParagraphElement because a CharacterElement produce problems with formating in a word
element = ((AbstractDocument)document).getParagraphElement( offset );
} catch( java.lang.Exception ex ) {
return;
}
checkElement( element );
offset = element.getEndOffset();
}while( offset < end && offset < document.getLength() );
}
/**
* Check the spelling of the text of an element.
*
* @param element
* the to checking Element
*/
private void checkElement( javax.swing.text.Element element ) {
try {
int i = element.getStartOffset();
int j = element.getEndOffset();
Highlighter highlighter = jText.getHighlighter();
Highlight[] highlights = highlighter.getHighlights();
for( int k = highlights.length; --k >= 0; ) {
Highlight highlight = highlights[k];
if( highlight.getStartOffset() >= i && highlight.getEndOffset() <= j ) {
highlighter.removeHighlight( highlight );
}
}
int l = ((AbstractDocument)jText.getDocument()).getLength();
j = Math.min( j, l );
if( i >= j )
return;
// prevent a NPE if the dictionary is currently not loaded.
Dictionary dic = dictionary;
Locale loc = locale;
if( dic == null || loc == null ){
return;
}
Tokenizer tok = new Tokenizer( jText, dic, loc, i, j, options );
String word;
while( (word = tok.nextInvalidWord()) != null ) {
int wordOffset = tok.getWordOffset();
highlighter.addHighlight( wordOffset, wordOffset + word.length(), painter );
}
} catch( BadLocationException e ) {
e.printStackTrace();
}
}
/**
// * Check the completely text. Because this can consume many times with large Documents that this will do in a thread
* in the background step by step.
*/
private void checkAll() {
if( dictionary == null || jText == null ) {
//the needed objects does not exists
return;
}
Thread thread = new Thread( new Runnable() {
public void run() {
Document document = jText.getDocument();
for( int i = 0; i < document.getLength(); ) {
try {
final Element element = ((AbstractDocument)document).getParagraphElement( i );
i = element.getEndOffset();
SwingUtilities.invokeLater( new Runnable() {
public void run() {
checkElement( element );
}
} );
} catch( java.lang.Exception ex ) {
return;
}
}
}
}, "JOrtho checkall" );
thread.setPriority( Thread.NORM_PRIORITY - 1 );
thread.setDaemon( true );
thread.start();
}
/**
* {@inheritDoc}
*/
public void languageChanged( LanguageChangeEvent ev ) {
dictionary = SpellChecker.getCurrentDictionary();
locale = SpellChecker.getCurrentLocale();
checkAll();
}
}