@Emrecp
I believe @SGaist is telling you that you cannot guarantee that a widget with a stylesheet will look identical to one you construct with coded style attributes. As soon as you place a stylesheet on a widget you are (potentially) losing some styles which are inbuilt, so it may differ.

I suggested earlier you remove the weight stuff in your example and see whether just with the font in "normal" it does or does not look identical using the same font in both code and stylesheet.

If you are coding inside paintEvent() then, as you say, you cannot use stylesheet. You can only set the attributes on a QFont as you have done.

I don't know whether you can go through the sources of Qt to discover just what a current style like Fusion does.

@timob256 said in How include "qfont" in "qlabel" ??:

I did not understand which command to write to make it work

Open documentation for setFont: https://doc.qt.io/qt-6/qwidget.html#font-prop
As you can clearly see setFont does not take a pointer to QFont, but you're trying to give it a pointer. This is basic C++ knowledge.
Change to:

ui->label->setFont(*font);

Or, even better, don't declare font as pointer...

@ChrisW67 Really so hard the read the bug report and what I wrote? It is fixed in 6.2.3 and 6.3.x ...

no, decrese the font size and see if it works. then you'll know whether you can change font size at all. If it works then that should be a hint as to why you cannot increase the size.

@SGaist got it.

@TheTrueGoofy said in Read and write QBrush (QPen, QFont) as XML:

Certainly this is also quite simple to implement, but I was hoping that there is a more elegant solution.

I think the only other way is to create feature request for QtGui, or implement a Qt patch yourself - to add a QBrush::toString() method (or QTextStream overload), with a corresponding QBrush::fromString().

@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.

@Violet-Giraffe said:

Isn't any modern C++ compiler capable of doing that optimization implicitly (with optimizations enabled)?

In all probability, yes; it's just a stupid habit. Compilers weren't so smart before, but they are improving by the minute. You can safely replace it with left.height() / 2.

Weight is an enumeration and theres a corresponding getter

Ok, I found the solution for Windows-Side:
When opening a font with FontForge, there (in GridFitting-Options) one can set certain attributes for certain point-sizes, such as Antialiasing. There is even two special columns for giving attributes to ClearType. These settings will be respected by ClearType, so no need to switch it off.

On Linux based OS, I still am no further, except that I know that some sort of fontconfig is what Qt5 "reads" and therefore decides. Unfortunately the Linux-RenderEngine ignores the above mentioned internal font-attributes.