Comment changer la couleur de mots spécifiques dans un JTextPane?
Comment changer la couleur de certains mots dans un JTextPane juste pendant que l'utilisateur tape? Dois-je remplacer la méthode JTextPanepaintComponent?
Le remplacement de paintComponent ne vous aidera pas.
Ce n'est pas facile, mais pas impossible non plus. Quelque chose comme ça vous aidera:
DefaultStyledDocument document = new DefaultStyledDocument();
JTextPane textpane = new JTextPane(document);
StyleContext context = new StyleContext();
// build a style
Style style = context.addStyle("test", null);
// set some style properties
StyleConstants.setForeground(style, Color.BLUE);
// add some data to the document
document.insertString(0, "", style);
Vous devrez peut-être modifier cela, mais au moins cela vous montre par où commencer.
Non. Vous n'êtes pas censé remplacer la méthode paintComponent (). À la place, vous devez utiliser StyledDocument. Vous devez également délimiter les mots par vous-même.
Voici la démo, qui devient "publique", "protégée" et "privée" en rouge lors de la frappe, comme un simple éditeur de code:
import javax.swing.*;
import Java.awt.*;
import javax.swing.text.*;
public class Test extends JFrame {
private int findLastNonWordChar (String text, int index) {
while (--index >= 0) {
if (String.valueOf(text.charAt(index)).matches("\\W")) {
break;
}
}
return index;
}
private int findFirstNonWordChar (String text, int index) {
while (index < text.length()) {
if (String.valueOf(text.charAt(index)).matches("\\W")) {
break;
}
index++;
}
return index;
}
public Test () {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(400, 400);
setLocationRelativeTo(null);
final StyleContext cont = StyleContext.getDefaultStyleContext();
final AttributeSet attr = cont.addAttribute(cont.getEmptySet(), StyleConstants.Foreground, Color.RED);
final AttributeSet attrBlack = cont.addAttribute(cont.getEmptySet(), StyleConstants.Foreground, Color.BLACK);
DefaultStyledDocument doc = new DefaultStyledDocument() {
public void insertString (int offset, String str, AttributeSet a) throws BadLocationException {
super.insertString(offset, str, a);
String text = getText(0, getLength());
int before = findLastNonWordChar(text, offset);
if (before < 0) before = 0;
int after = findFirstNonWordChar(text, offset + str.length());
int wordL = before;
int wordR = before;
while (wordR <= after) {
if (wordR == after || String.valueOf(text.charAt(wordR)).matches("\\W")) {
if (text.substring(wordL, wordR).matches("(\\W)*(private|public|protected)"))
setCharacterAttributes(wordL, wordR - wordL, attr, false);
else
setCharacterAttributes(wordL, wordR - wordL, attrBlack, false);
wordL = wordR;
}
wordR++;
}
}
public void remove (int offs, int len) throws BadLocationException {
super.remove(offs, len);
String text = getText(0, getLength());
int before = findLastNonWordChar(text, offs);
if (before < 0) before = 0;
int after = findFirstNonWordChar(text, offs);
if (text.substring(before, after).matches("(\\W)*(private|public|protected)")) {
setCharacterAttributes(before, after - before, attr, false);
} else {
setCharacterAttributes(before, after - before, attrBlack, false);
}
}
};
JTextPane txt = new JTextPane(doc);
txt.setText("public class Hi {}");
add(new JScrollPane(txt));
setVisible(true);
}
public static void main (String args[]) {
new Test();
}
}
Le code n'est pas si beau car je l'ai tapé rapidement mais ça marche. Et j'espère que cela vous donnera un indice.
Une autre solution consiste à utiliser un DocumentFilter.
Voici un exemple:
Créez une classe qui étend DocumentFilter:
private final class CustomDocumentFilter extends DocumentFilter
{
private final StyledDocument styledDocument = yourTextPane.getStyledDocument();
private final StyleContext styleContext = StyleContext.getDefaultStyleContext();
private final AttributeSet greenAttributeSet = styleContext.addAttribute(styleContext.getEmptySet(), StyleConstants.Foreground, Color.GREEN);
private final AttributeSet blackAttributeSet = styleContext.addAttribute(styleContext.getEmptySet(), StyleConstants.Foreground, Color.BLACK);
// Use a regular expression to find the words you are looking for
Pattern pattern = buildPattern();
@Override
public void insertString(FilterBypass fb, int offset, String text, AttributeSet attributeSet) throws BadLocationException {
super.insertString(fb, offset, text, attributeSet);
handleTextChanged();
}
@Override
public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
super.remove(fb, offset, length);
handleTextChanged();
}
@Override
public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attributeSet) throws BadLocationException {
super.replace(fb, offset, length, text, attributeSet);
handleTextChanged();
}
/**
* Runs your updates later, not during the event notification.
*/
private void handleTextChanged()
{
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
updateTextStyles();
}
});
}
/**
* Build the regular expression that looks for the whole Word of each Word that you wish to find. The "\\b" is the beginning or end of a Word boundary. The "|" is a regex "or" operator.
* @return
*/
private Pattern buildPattern()
{
StringBuilder sb = new StringBuilder();
for (String token : ALL_WORDS_THAT_YOU_WANT_TO_FIND) {
sb.append("\\b"); // Start of Word boundary
sb.append(token);
sb.append("\\b|"); // End of Word boundary and an or for the next Word
}
if (sb.length() > 0) {
sb.deleteCharAt(sb.length() - 1); // Remove the trailing "|"
}
Pattern p = Pattern.compile(sb.toString());
return p;
}
private void updateTextStyles()
{
// Clear existing styles
styledDocument.setCharacterAttributes(0, yourTextPane.getText().length(), blackAttributeSet, true);
// Look for tokens and highlight them
Matcher matcher = pattern.matcher(yourTextPane.getText());
while (matcher.find()) {
// Change the color of recognized tokens
styledDocument.setCharacterAttributes(matcher.start(), matcher.end() - matcher.start(), greenAttributeSet, false);
}
}
}
Il vous suffit alors d'appliquer le DocumentFilter que vous avez créé à votre JTextPane comme suit:
((AbstractDocument) yourTextPane.getDocument()).setDocumentFilter(new CustomDocumentFilter());
Vous pouvez étendre DefaultStyledDocument comme je l'ai fait ici pour un éditeur SQL que je construis avec la coloration du texte des mots clés ...
import Java.util.ArrayList;
import Java.util.List;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Style;
public class KeywordStyledDocument extends DefaultStyledDocument {
private static final long serialVersionUID = 1L;
private Style _defaultStyle;
private Style _cwStyle;
public KeywordStyledDocument(Style defaultStyle, Style cwStyle) {
_defaultStyle = defaultStyle;
_cwStyle = cwStyle;
}
public void insertString (int offset, String str, AttributeSet a) throws BadLocationException {
super.insertString(offset, str, a);
refreshDocument();
}
public void remove (int offs, int len) throws BadLocationException {
super.remove(offs, len);
refreshDocument();
}
private synchronized void refreshDocument() throws BadLocationException {
String text = getText(0, getLength());
final List<HiliteWord> list = processWords(text);
setCharacterAttributes(0, text.length(), _defaultStyle, true);
for(HiliteWord Word : list) {
int p0 = Word._position;
setCharacterAttributes(p0, Word._Word.length(), _cwStyle, true);
}
}
private static List<HiliteWord> processWords(String content) {
content += " ";
List<HiliteWord> hiliteWords = new ArrayList<HiliteWord>();
int lastWhitespacePosition = 0;
String Word = "";
char[] data = content.toCharArray();
for(int index=0; index < data.length; index++) {
char ch = data[index];
if(!(Character.isLetter(ch) || Character.isDigit(ch) || ch == '_')) {
lastWhitespacePosition = index;
if(Word.length() > 0) {
if(isReservedWord(Word)) {
hiliteWords.add(new HiliteWord(Word,(lastWhitespacePosition - Word.length())));
}
Word="";
}
}
else {
Word += ch;
}
}
return hiliteWords;
}
private static final boolean isReservedWord(String Word) {
return(Word.toUpperCase().trim().equals("CROSS") ||
Word.toUpperCase().trim().equals("CURRENT_DATE") ||
Word.toUpperCase().trim().equals("CURRENT_TIME") ||
Word.toUpperCase().trim().equals("CURRENT_TIMESTAMP") ||
Word.toUpperCase().trim().equals("DISTINCT") ||
Word.toUpperCase().trim().equals("EXCEPT") ||
Word.toUpperCase().trim().equals("EXISTS") ||
Word.toUpperCase().trim().equals("FALSE") ||
Word.toUpperCase().trim().equals("FETCH") ||
Word.toUpperCase().trim().equals("FOR") ||
Word.toUpperCase().trim().equals("FROM") ||
Word.toUpperCase().trim().equals("FULL") ||
Word.toUpperCase().trim().equals("GROUP") ||
Word.toUpperCase().trim().equals("HAVING") ||
Word.toUpperCase().trim().equals("INNER") ||
Word.toUpperCase().trim().equals("INTERSECT") ||
Word.toUpperCase().trim().equals("IS") ||
Word.toUpperCase().trim().equals("JOIN") ||
Word.toUpperCase().trim().equals("LIKE") ||
Word.toUpperCase().trim().equals("LIMIT") ||
Word.toUpperCase().trim().equals("MINUS") ||
Word.toUpperCase().trim().equals("NATURAL") ||
Word.toUpperCase().trim().equals("NOT") ||
Word.toUpperCase().trim().equals("NULL") ||
Word.toUpperCase().trim().equals("OFFSET") ||
Word.toUpperCase().trim().equals("ON") ||
Word.toUpperCase().trim().equals("ORDER") ||
Word.toUpperCase().trim().equals("PRIMARY") ||
Word.toUpperCase().trim().equals("ROWNUM") ||
Word.toUpperCase().trim().equals("SELECT") ||
Word.toUpperCase().trim().equals("SYSDATE") ||
Word.toUpperCase().trim().equals("SYSTIME") ||
Word.toUpperCase().trim().equals("SYSTIMESTAMP") ||
Word.toUpperCase().trim().equals("TODAY") ||
Word.toUpperCase().trim().equals("TRUE") ||
Word.toUpperCase().trim().equals("UNION") ||
Word.toUpperCase().trim().equals("UNIQUE") ||
Word.toUpperCase().trim().equals("WHERE"));
}
}
Ajoutez-le simplement à votre classe comme ceci:
import Java.awt.BorderLayout;
import Java.awt.Color;
import Java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
public class SQLEditor extends JFrame {
private static final long serialVersionUID = 1L;
public SQLEditor() {
StyleContext styleContext = new StyleContext();
Style defaultStyle = styleContext.getStyle(StyleContext.DEFAULT_STYLE);
Style cwStyle = styleContext.addStyle("ConstantWidth", null);
StyleConstants.setForeground(cwStyle, Color.BLUE);
StyleConstants.setBold(cwStyle, true);
final JTextPane pane = new JTextPane(new KeywordStyledDocument(defaultStyle, cwStyle));
pane.setFont(new Font("Courier New", Font.PLAIN, 12));
JScrollPane scrollPane = new JScrollPane(pane);
getContentPane().add(scrollPane, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(375, 400);
}
public static void main(String[] args) throws BadLocationException {
SQLEditor app = new SQLEditor();
app.setVisible(true);
}
}
Voici la classe HiliteWord manquante ...
public class HiliteWord {
int _position;
String _Word;
public HiliteWord(String Word, int position) {
_position = position;
_Word = Word;
}
}