Drawing a vertical line on a QPlainTextEdit?

[Fuchsiaff]

Is it possible to draw a vertical line on a QPlainTextEdit so that it wouldn't prevent people from writing text on top of it? I'm aiming for something like this:

[mrjj]

Hi
Sure it is. Fast sample. Note. using fixed numbers. you want to use viewport()->height() etc.

#ifndef MYTEXT_H
#define MYTEXT_H

#include <QPainter>
#include <QPlainTextEdit>
class MyText : public QPlainTextEdit
{
    Q_OBJECT
public:
    explicit MyText(QWidget *parent = nullptr) : QPlainTextEdit(parent) {}
protected:
    virtual void paintEvent(QPaintEvent *event) override
    {
        QPlainTextEdit::paintEvent(event);
        QPainter p(viewport()); // note we use viewport as its the one that actually draws
        p.drawLine(100, 0, 100, 1000);

    }
};

#endif // MYTEXT_H