Add irreversible changes in a QPlainTextEdit

[Maluna34]

Hello !

I'm working on a kind of code editor. To dot it, I'm using a QPlainTextEdit, as this example shows, to be able to display the line numbers for example.
But I also want to add some anchors and html links in this editor to jump from some lines to others.
I know that for this, QTextBrowser is more suitable, but I want to keep my editor features.

And when I add a link with a QPlainTextEdit, I don't want to add an item in the undo stack. So I tried something like this :

auto editor = new QPlainTextEdit;

void addLink()
{
    editor->setUndoRedoEnabled(false);
    editor->document()->blockSignals(true);   // To prevent the modificationChanged to be emitted.

    QTextCursor cursor { editor->textCursor() };
    cursor.insertHtml("<a href=\"anchor\">LINK</a>");    // Actually we replace the existing text with a link.

    editor->document()->blockSignals(false);
    editor->setUndoRedoEnabled(true);
}

But the problem is that setUndoRedoEnabled clears the undo/redo stack. We should use QSyntaxHighlighter to avoid adding an item in the stack but is it possible to add html link ??

• Actually, here are the three options I see :

• Be able to add some text without changing the undo/redo stack
• Be able to add html links with the highlighter
• Be able to display the line numbers using a QTextBrowser

Maybe there is another solution.
Thanks for your help !

[SGaist]

Hi,

AFAIK you cannot do it easily.

Note that QTextBrowser can be made writable.