StyleSheet question

[chandan]

Hi Everyone,
I am using Qt for a project. Now I need to do some styling to my UI. I think using Style Sheet could be useful for me. So if I want to use the same color and and background style then I have to use QPushButton{color: lightblue;} for all the buttons available in my UI. Can anyone tell me how to declare this stylesheet once and can be used for any buttons please? I know this is silly question but I am really stuck on it now. Another thing to ask I need to have some example to use gradient in the style sheet. Any help will be appreciated.
Thanks in advance.
Chandan

[Lykurg]

load a file or hardcode you css in a QString then fetch the main application via qApp() and use QApplication::setStyleSheet(). Place it at best in the constructor of you main window or in your main function.

Example:

main() {
  QApplication a(argc, argv);
  a.setStyleSheet("QPushButton {color: #ff0000;}");
  //...
  return a.exec();
}

main() {
  QApplication a(argc, argv);
  a.setStyleSheet("QPushButton {color: #ff0000;}");
  //...
  return a.exec();
}

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[MorrisLiang]

You should check out the chapter about StyleSheet in Qt Assistant.
Just like Lykurg said,you can load a css/qss dynamically or hard code it.

here is the dynamic method:

QFile qss(path);
qss.open(QFile::ReadOnly);
qApp->setStyleSheet(qss.readAll());
qss.close();

QFile qss(path);
qss.open(QFile::ReadOnly);
qApp->setStyleSheet(qss.readAll());
qss.close();

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QPushButton{color: lightblue;} Means all QPushButtons' color is lightblue.
QMainWindow > QPushButton{color: lightblue;} Means to style all QPushButtons which are direct children of QMainWindow.
There're more seletor rules.
And one isn't documented is
#myBtn{background-color: blue} The # means to apply this style to the widget whose name is "myBtn"

[Lykurg]

And one isn't documented is
#myBtn{background-color: blue} The # means to apply this style to the widget whose name is "myBtn"

The 5th row in the table under selector types:

D Selector QPushButton#okButton Matches all QPushButton instances whose object name is okButton.

[MorrisLiang]

The 5th row in the table under selector types:

ha,I didn't notice that...

[FoleyX90]

If you do QPushButton{style goes here} in your QMainWindow stylesheet, all your QPushButtons will be the same style in that window and if you create new windows as a subclass of this window.

[FoleyX90]

for instance, MyNewWindow *newWindow = MyNewWindow(this);