Qt. I have a form. There is 2 widgets on it, that contains other widgets, buttons, line edits etc. I need: When user sets focus, clicks by mouse, or does something with first widget or elements, that it contain - I need to set variable to 0. If he do something same with second widget - variable must be set in 1. How to do that?
QApplication::focusWidget() returns pointer to widget which has focus at this moment. Also there is QApplication::focusChanged(QWidget *old, QWidget *now) signal and you can connect it to slot to change variable.