CODEWITHSUNDEEP
qtqtextedit
Ufx
Ufx

Reputation: 2695

QTextEdit. In textChanged slot change colors for some words and restore

I need to paint some words in QTextEdit by other colors.

void Wnd::onTextChanged()
{
    QString s = ui->textEdit->toPlainText();
    s = addColors(s);

    ui->textEdit->blockSignals(true);
    ui->textEdit->setHtml(s);
    ui->textEdit->blockSignals(false);
}

QTextEditor::setHtml set cursor and visible region in the beginning. But I need to my QTextEdit using will be no different from simple QTextEdit using.

Upvotes: 0

Views: 608

Answers (1)

Marek R
Marek R

Reputation: 38161

You are doing that wrong, creating big overhead. You should do this like that:

void Wnd::onTextChanged()
{
    QTextDocument *doc = ui->textEdit->document();

    // clears old formating
    QTextCursor cursor(doc);
    cursor.select(QTextCursor::Document);
    cursor.setCharFormat(QTextCharFormat());

    Q_FOREACH(QString word, wordsToColor) {
        QTextCursor cursor = doc->find(word);

        while(cursor.hasSelection()) {
             cursor.setCharFormat(someTextCharFormat);
             cursor = doc->find(word, cursor); // next word
        }
    }
}

It is also possible that you are trying to do something what is already solved: http://qt-project.org/doc/qt-4.8/richtext-syntaxhighlighter.html

Upvotes: 2

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