QLabel not being showed in QTextEdit

anphetamina

I wrote a class that inherits from QTextEdit and overrides the printEvent method in which I need to paint a label in the top right corner of a QRect painted in the document

void TextEditor::paintEvent(QPaintEvent *e) {

    try {
        QPainter painter(viewport());
        QTextCursor cursor(document());
        painter.setPen(Qt::yellow);
        cursor.setPosition(1);
        QRect cRect = cursorRect(cursor);
        QLabel label = QLabel("test", this);
        label.setTextInteractionFlags(Qt::NoTextInteraction);
        label.setStyleSheet("QLabel { background-color : red; color : white; }");
        label.move(cRect.topRight());
        painter.drawRect(cRect);
                    
        document()->drawContents(&painter);
    } catch (const std::exception &e) {
        qDebug() << e.what();
    }
}

The QRect is correctly painted inside the document but the label is not.

JonB

@anphetamina
I have no idea whether your principle is supposed to work or not, but if nothing else your QLabel label is a local variable which goes out of scope at the end of this method, so I think it would fail to draw on that account if nothing else.

anphetamina

You're right, so I've tried to follow the same approach as the cursor invoking drawRect also for the label, like this:

QRect lRect = label.rect();
painter.drawRect(lRect);

But it prints a rectangle in the top-left corner of the document using the same color of the painter

SGaist

Hi,

At no point you are rendering your label. You are just painting literally a rectangle based on a label that has no "physical presence" since it's not even shown.

What exactly do you want to do with that QLabel ?