Does the use of styleSheets in a dynamic manner add a lot of computation

Question

I have about 40 buttons that are also indicators (On or Off) and once a second I refresh the color of these indicators depending on the state. I do this by changing the sty

Answer 1

Yes. I found that with Qt 4.6.2 on Linux, setting a stylesheet to change the colour of the text on a QLabel is very slow.

The dynamic stylesheet looked like a great solution but for me, the necessary setStyle() was just as expensive as setStyleSheet()!

After much experimentation, I found this alternative to be at least twice as quick, and usually more than 50 times as quick:

QPalette palette = lbl->palette();
palette.setColor(QPalette::WindowText, Qt::gray);
lbl->setPalette(palette);

Depending on how your (static) stylesheet is set up, you'd have to replace QPalette::WindowText with QPalette::Window or QPalette::Button. See the QPalette documentation for details.