qt:connect connects a signal to a slot.
The signal is either a qt:qsignal created with
qt:make-signal or a C++ signal by using
qt:get-signal.
The slot can be a slot returned by qt:make-slot, a function
or a C++ slot a return from qt:get-slot.
Example 3.2. Quit
;;; Copyright 2009 Tobias Rautenkranz ;;; License: X11 license (in-package :qt.examples) (defun hello-world-quit () "Quit on push-button click" (qt:with-app () (let ((quit (make-instance 'qt:push-button :args '("Quit"))) (font (make-instance 'qt:font :args (list "Times" 18 qt:font.+bold+)))) (cxx:resize quit 75 30) (setf (cxx:font quit) font) (qt:connect (qt:get-signal quit "pressed()") #'(lambda () (format t "About to quit()~%"))) (qt:connect (qt:get-signal quit "clicked()") (qt:get-slot (qt:app) "quit()")) (cxx:show quit) (qt:exec))))
When the argument types for a slot or signal are not specified they are determined when
the first connection is made. Note that when connecting a qt:qsignal
to a qt:qslot at least one must have its arguments types specified. Type specifier T
allows to pass a Lisp object as is from a Lisp signal to a Lisp slot.
The functionality of the Qt SIGNAL and SLOT macros is
provided by qt:qsignal and qt:qslot.