QFont::pixelSize returns -1

[Warbit]

Hello averybody. Please, answer me for what reason the QFont::pixelSize() returns -1 value. In official docs i've read that it maybe accures in case of setPointSize() and setPointSizeF() using. But I do not ever explicit used that methods in my program. Please, clear me about what can be cause of that weard pixelSize() behavior.
The problem code is attached below.

/*virtual*/ void CodeEditor::wheelEvent(QWheelEvent * whe)
{
    int delta = whe->delta()/60;
    int fontSize = this->document()->defaultFont().pixelSize();     // PROBLEM LINE
    qDebug()<<"CodeEditor::wheelEvent - "<<fontSize;

    QPlainTextEdit::wheelEvent(whe);
    QCoreApplication::sendEvent(pHandler, whe);

    if (pHandler->ctrlPressed){
        qDebug()<<this->document()->defaultFont();
        emit wheelScrolling(delta);
    }
}

Advance grateful for any help.

[SGaist]

Hi,

You did not but it might be the case of the code setting up the font which is likely since the point size is device independent.

[Asperamanca]

It's not exactly the same, but QFontMetrics::height() might do what you want.

[Ratzz]

@Warbit
You can use http://doc.qt.io/qt-4.8/qfont.html#pointSize

[Asperamanca]

@Ratzz said:

@Warbit
You can use http://doc.qt.io/qt-4.8/qfont.html#pointSize

Yes, but why would you if you need the pixelSize?

[Ratzz]

@Asperamanca
Doc says "Returns the pixel size of the font if it was set with setPixelSize() ".
OP says " But I do not ever explicit used that methods in my program."
so it returns -1 for him always.