Adding to a stylesheet in the cpp file without overriding previous functions

[Dummie1138]

Hi. I'm writing some cpp code that changes the color of the text. I have some preexisting stylesheet code (about 200 lines) in my ui file. The code in the ui file for QWidget, QLabel, QGroupBox and QPushButton are as follows:

QWidget {
	font: 25px "DejaVu Sans";
	background-color: #e0e0e0; }

QLineEdit {
	background-color: white;
    border: 1px solid #8f8f91;
    border-style: solid;
    border-radius: 4px;
    font: 30px;
	padding-left: 10px;
}
QPushButton {
	border: 2px solid #8f8f91;
	border-radius: 9px;
	background-color: QLinearGradient(x1: 0, y1: 0, x2: 0, y2: 1,stop: 0 #f6f7fa, stop: 1 #dadbde);	
	font: 25px;
	outline: none; }
QLabel {
	font: 25px;
	background: transparent;
}
QGroupBox {
	border: 2px solid #8f8f91;
	border-radius: 9px; }

This is the code in the cpp file I used to change the color of the text.

    setStyleSheet(
                    "QWidget { color: red }"
                    "QLabel { color: red }"
                    "QGroupBox { color: red }"
                    "QPushButton { color: red }"
                      );

What happens right now is that the cpp file seems to completely override the ui file. I was wondering whether there's a function in stylesheets that allow for "adding" commands to the stylesheet without completely overriding preexisting commands.

[JonB]

@Dummie1138 said in Adding to a stylesheet in the cpp file without overriding previous functions:

What happens right now is that the cpp file seems to completely override the ui file.

Absolutely. You use setStyleSheet(), so it completely replaces whatever was there.

I was wondering whether there's a function in stylesheets that allow for "adding" commands to the stylesheet without completely overriding preexisting commands.

No there is not, there is no "merging" available. You would have to fetch existing widget->styleSheet(), parse it and do whatever you want yourself. I'm afraid there is no help with this from Qt, they are just strings you have to deal with yourself. If all you want to do is just add new stuff you can add it at end of existing, like

widget->setStyleSheet(widget->styleSheet() + ';' + newStuff);

but needs adjusting for the existing terminating } which will already be there.

[Dummie1138]

@JonB Does setStyleSheet override everything? Say I am only setting QLabel in a new setStyleSheet, would it completely remove the stylesheet arguments on everything else?

[JonB]

@Dummie1138 said in Adding to a stylesheet in the cpp file without overriding previous functions:

Say I am only setting QLabel in a new setStyleSheet, would it completely remove the stylesheet arguments on everything else?

Absolutely not. Calling setStyleSheet() on one widget does not in itself alter any other style sheets you might have assigned to other widgets. Of course, the effect of the change may affect other widget descendants in the hierarchy, but that is a quite different matter.