Assume an application that creates a focusable dialog with 9 buttons. Clicking buttons 1-8 causes the creation of new windows — type 1 through type 8, each type supporting a slot, S, that can be connected to the signal of button 9.
Clicking button 9 should trigger slot S only of the window that was most recently active. Which is to say the connection can't usefully be set up when the window is created. A solution would seem to be to add a look-at-me signal to all the window types, which they would emit to the dialog upon receiving focus; the receiver would then [ disconnect(Button9,0,0,0) ] and then connect Button 9 to the signalling window's slot S by way of QObject::sender() with a side order of qobject_cast...at which point I am realize I am stupid and ignorant and have misplaced all my B vitamins and choline supplements and my coffee is cold and foul. The documentation warns against using Sender this way, but chides rather than forbids. Look-at-me signals not arriving in order would be a dealbreaker, but unless I'm misreading, establishing the connection with Qt::DirectConnection will fix that. And I guess checking for 0 against the result of the cast will avoid crashing. So: is this approach even minimally sane, and even if so is there a (better) way to do it? _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
