[Qt-interest] removing all user block data of a QTextEdit

[Lorenzo Bettini]

Hi

in a text editor I'm using my own implementation of syntax highlighting
(deriving from QSyntaxHighlighter), which sets user block data in the
QTextDocument.

Now, I need to switch among highlighters, and when I switch the
highlighter, the previous set user block data must be removed.

Is there a smarter way then this one (which saves the text, clears it,
and then resets it)?

void qeditexample::changeHighlightingLanguage(const QString &newLang) {
     // avoid to switch language if it's just the same
     if (newLang.toStdString() == highlighter->getLangFile())
         return;

     // make sure we remove all the information in the QTextBlocks
     // that were added by the previous highlighter
     QString text = textEdit->toPlainText();
     textEdit->clear();

     // set the new Qt4SyntaxHighlighter for highlighting context
     highlighter =
               new srchiliteqt::Qt4SyntaxHighlighter(textEdit->document());
     highlighter->init(newLang.toStdString());

     // reset the text, that will be highlighted with the new scheme
     textEdit->setText(text);
}

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Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
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