How to prevent Qt child windows from inheriting the style of the parent window?

[Aizzzz]

For example, there are two windows named ParentWidget and ChildWidget, both of which have a QPushButton control with the default name pushButton.
Now, create a widget in ParentWidget, and promote it to ChildWidget. Then I set the following style sheet for the outermost window in ParentWidget:

#ParentWidget QPushButton#pushButton{ background:#1785E6; }

After the program runs, this style sheet will affect both the button in ParentWidget and the button in ChildWidget. How can I make it only affect the controls in ParentWidget?

[Pl45m4]

@Aizzzz said in How to prevent Qt child windows from inheriting the style of the parent window?:

How can I make it only affect the controls in ParentWidget?

ParentWidget > QPushButton { ... }

This will only affect QPushButtons which are direct children of ParentWidget.

• https://doc.qt.io/qt-6/stylesheet-syntax.html#selector-types

[IPlayGenji6]

Add the property parentName to all your QPushButton elements in parentWidget, and set the value to "parentWidget" for each of them.

QObjectList buttons = ParentWidget->findChildren<QPushButton*>();
for (QPushButton* button : buttons) {
        button->setProperty("parentName", "parentWidget");
}

in qss:

QPushButton[parentName = "parentWidget"]
{
background: #123456;
}