;;;; Gtk+ 3 tutorial for Common Lisp
;;;; https://lisp-journey.gitlab.io/blog/gui-programming-in-common-lisp-part-3-of-5-gtk3/

(ql:quickload :cl-cffi-gtk)

(defpackage :gtk-tutorial
  (:use :gtk :gdk :gdk-pixbuf :gobject
   :glib :gio :pango :cairo :common-lisp))

(in-package :gtk-tutorial)

(defun hello-world ()
  ;; in the docs, this is example-upgraded-hello-world-2.
  (within-main-loop
    (let ((window (make-instance 'gtk-window
                                 :type :toplevel
                                 :title "Hello Buttons"
                                 :default-width 250
                                 :default-height 75
                                 :border-width 12))
          (box (make-instance 'gtk-box
                              :orientation :horizontal
                              :spacing 6)))
      (g-signal-connect window "destroy"
                        (lambda (widget)
                          (declare (ignore widget))
                          (leave-gtk-main)))
      (let ((button (gtk-button-new-with-label "Button 1")))
        (g-signal-connect button "clicked"
                          (lambda (widget)
                            (declare (ignore widget))
                            (format t "Button 1 was pressed.~%")))
        (gtk-box-pack-start box button))
      (let ((button (gtk-button-new-with-label "Button 2")))
        (g-signal-connect button "clicked"
                          (lambda (widget)
                            (declare (ignore widget))
                            (format t "Button 2 was pressed.~%")))
        (gtk-box-pack-start box button))
      (gtk-container-add window box)
      (gtk-widget-show-all window))))