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.