QFontMetrics, i can't understand

[pakulo]

QFont font;
font.setBold(true);
std::cout<<QFontMetrics(font).width("...");

Writed 9.

QFont font;
std::cout<<QFontMetrics(font).width("...");

Writed 12.

Why if font is bold the width is smaller then if font is nobold?

[jacek]

It seems to work OK on my system. Which Qt version and what font do you use?

[pakulo]

Qt 4.3

I use only this code

QFont font2;
std::cout<<QFontMetrics(font2).width("...")<<"\n";
font2.setBold(true);
font2.setItalic(true);
std::cout<<QFontMetrics(font2).width("...");

QFont font2;
std::cout<<QFontMetrics(font2).width("...")<<"\n";
font2.setBold(true);
font2.setItalic(true);
std::cout<<QFontMetrics(font2).width("...");

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And it is write

12
9

[pakulo]

if i don't use font2.setBold(true);
it is write
12
12

[jacek]

I've just tried it on windows, and indeed I got 12 and 9, but if you start Qt Designer and compare two labels (one with normal font and second with bold font), you'll see it's a correct result for the default font.

[pakulo]

it is a bug of the Qt?

[marcel]

I've just tried it on windows, and indeed I got 12 and 9, but if you start Qt Designer and compare two labels (one with normal font and second with bold font), you'll see it's a correct result for the default font.

I can't confirm this with 4.3 on XP. A bold text has a bigger width than the same text, not bold.

I'll try to see what QFontMetrics returns.

Regards

[marcel]

fmetrics::fmetrics(QWidget *parent, Qt::WFlags flags)
    : QDialog(parent, flags)
{
    ui.setupUi(this);
 
    QFontMetrics metrics(ui.label->font());
    QFontMetrics metrics2(ui.label_2->font());
 
    qDebug( QString("%1").arg(metrics.width(ui.label->text())).toAscii().constData() );
    qDebug( QString("%1").arg(metrics2.width(ui.label_2->text())).toAscii().constData() );
}

fmetrics::fmetrics(QWidget *parent, Qt::WFlags flags)
    : QDialog(parent, flags)
{
    ui.setupUi(this);

    QFontMetrics metrics(ui.label->font());
    QFontMetrics metrics2(ui.label_2->font());

    qDebug( QString("%1").arg(metrics.width(ui.label->text())).toAscii().constData() );
    qDebug( QString("%1").arg(metrics2.width(ui.label_2->text())).toAscii().constData() );
}

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label and label_2 are two QLabels with the same font set. One has normal font and the other has a bold font.

I always get a smaller width for the label with normal font. I tried with several fonts.

What font did you use?

Regards

[jacek]

it is a bug of the Qt?

No, everything is OK. It's just a property of a font you have used.

ss.png

[jacek]

I can't confirm this with 4.3 on XP.

Try it on "..." and MS Shell Dlg 2 font.

[marcel]

Yes, with "..." I get the same result.
But with other font families this seems to be OK.

Anyway, I don't see a real problem even with MS Shell Dlg 2, as long as the dimensions are correct( which they are ).

So, there must be a glitch in the font.

Regards

[jacek]

So, there must be a glitch in the font.

There is no glitch. Simply MS Shell Dlg 2 behaves this way.