When the application is launched but yet in construction time (when all the initial widget is being created and so on), I add to my layout a QSplitter, with two widgets, and I want the second widget occupies more or less the 60/70% of the available space, while the first widget takes the rest of the space (taking into account the splitter size itself).
So, in the beginning, before the windows itself is shown, I try to readjust these two widget more or less like that:
splitter->setOrientation(Qt::Vertical);
auto sizes = splitter->sizes();
int& first_w = sizes.front(); // == 0
int& second_w = sizes.last(); // == 0
int diff = form_w * 2.3 - tbl_w; (30% * 2.3 = ~70%)
second_w += diff;
first_w -= diff;
splitter->setSizes(sizes);
But, first_w and second_w contains 0 and 0, I don't know if because the sizes have not been calculated yet, or because the widget is not yet shown (the window isn't) and the sizes of invisibles widgets are 0.
What can I do to get the "future" sizes of these widgets? The splitter is inside a QVBoxLayout, and the available space of the owner widget is more or less all the vertical space of the window (there's only a QTabBar above the widget owning that QVBoxLayout, and a bit of padding in the window).
