CODEWITHSUNDEEP
c++qt
raze
raze

Reputation: 702

Enable/disable syntax highlight in QTextEdit

So, I'm writing a simple code editor in C++ and Qt. I have managed to create some syntax highlighting (SH) rules by using the QSyntaxHighlighter class. Now, I want to enable and disable this feature. To enable SH on a QTextEdit, I have a pointer:

SyntaxHighlight *highlighter;
highlighter = new SyntaxHighlight(editor->document());

All I have to do, is somehow make this pointer point to nothing. But I have tried to make it point to NULL and 0 without any result. Have also creates a deconstructor, and used delete highlighter. Nothing seems to work. Any ideas?

Please let me know if I should supply more code.

Upvotes: 5

Views: 2862

Answers (1)

alexisdm
alexisdm

Reputation: 29896

Rather than trying to delete the highlighter, you should use:

highlighter->setDocument(0);

Edit: Deleting the highlighter also works, so you have probably inadvertently set another QSyntaxHighlighter on the document, or you are not disabling or deleting the correct one.

Because the syntax highlighter installs itself as a child of the document, you can retrieve it / them with findChild / findChildren:

foreach(QSyntaxHighlighter* highlighter,
        ui->textEdit->findChildren<QSyntaxHighlighter*>()) {
    delete highlighter;
}

Upvotes: 5

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