How set Title of QgroupBox to bold

[denis13]

Hello everybody,

I would like to set the title of a QgroupBox in Qt 5.15 using python to bold but I can't find how to do it

Could Someone help me ?

Thank you :)

[jsulm]

@denis13 See https://doc.qt.io/qt-6/stylesheet-examples.html#customizing-qgroupbox

[denis13]

Hello, it's not work with QtWidgets but maybe, I must have made a mistake

This a snippet of code,

import sys
from PySide6.QtWidgets import QWidget,QVBoxLayout,QLabel,QApplication,QGroupBox
from PySide6.QtCore import Qt

class MyWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.layout = QVBoxLayout(self)
        self.group = QGroupBox("title",self)
        self.group.setStyleSheet("""QGroupBox::title{font:bold;}""")
        self.layout_vbox = QVBoxLayout(self.group)
        self.label = QLabel("ok")
        self.layout_vbox.addWidget(self.label,alignment=Qt.AlignLeft)
        self.layout.addWidget(self.group)

if __name__ == "__main__":
    app = QApplication()
    widget = MyWidget()
    widget.show()
    sys.exit(app.exec())

Thanks to your kindness and your help :)

[JonB]

@denis13 said in How set Title of QgroupBox to bold:

self.group.setStyleSheet("""QGroupBox::title{font:bold;}""")

If it's to work at all you would not want those extra quotes. Try with self.group.setStyleSheet("QGroupBox::title{font:bold;}")?

[denis13]

it's the same effect, it's not work....

[JonB]

@denis13
Don't know. First try the example for QGroupBox::title at https://doc.qt.io/qt-6/stylesheet-examples.html#customizing-qgroupbox and see if that has any effect? Maybe there is a problem setting the font with font:bold?

[denis13]

it's not work also however I use setStyleSheet in Python.....

[JonB]

@denis13 said in How set Title of QgroupBox to bold:

it's not work also however I use setStyleSheet in Python.....

Well I don't know how you come up with that. I just tried the QGroupBox::title code at https://doc.qt.io/qt-6/stylesheet-examples.html#customizing-qgroupbox I suggested and I certainly see some effect.

Since if I try self.group.setStyleSheet("QGroupBox::title{font:bold 14px;background-color:red;}") I do see a red background you can see we are setting the right stylesheet rule. I can only conclude that you cannot change the font.

UPDATE
You can, but not via QGroupBox::title. The following works

self.group.setStyleSheet("QGroupBox { font-size: 18px; font-weight: bold; }")

[mjiggidyj]

If stylesheets aren't working out for you, you can get a copy of QGroupBox's current font (you'll get a QtQui.QFont object), set it to bold, then set the new bold font:

grp_bold = QtWidgets.QGroupBox("Look How Bold I Am!")
fnt_group = grp_bold.font()
fnt_group.setBold(True)
grp_bold.setFont(fnt_group)

[JonB]

@mjiggidyj Which is exactly what the stylesheet I posted does and it works.

[mjiggidyj]

@JonB Oh no another option