(defun run ()
  (let ((output *standard-output*))
    (gtk:within-main-loop
      (let ((window (make-instance 'gtk:gtk-window
                                   :type :toplevel
                                   :window-position :center
                                   :title "Hello world!"
                                   :default-width 300
                                   :default-height 100))
            (button (make-instance 'gtk:button :label "Hello, world!"))
            (counter 0))
        (gobject:g-signal-connect button "clicked"
                                  (lambda (b)
                                    (declare (ignore b))
                                    (format output "Hello, world!~%")
                                    (setf (gtk:button-label button)
                                          (format nil
                                                  "Hello, world! (clicked ~D times)"
                                                  (incf counter)))))
        (gtk:container-add window button)
        (gtk:widget-show window :all t)))))

(run)

(defun demo-class-browser ()
  (let ((output *standard-output*))
    (gtk:within-main-loop
      (let* ((window (make-instance 'gtk:gtk-window
                                    :window-position :center
                                    :title "Class Browser"
                                    :default-width 400
                                    :default-height 600))
             (search-entry (make-instance 'gtk:entry))
             (search-button (make-instance 'gtk:button :label "Search"))
             (scroll (make-instance 'gtk:scrolled-window
                                    :hscrollbar-policy :automatic
                                    :vscrollbar-policy :automatic))
             (slots-model (make-instance 'gtk:array-list-store))
             (slots-list (make-instance 'gtk:tree-view :model slots-model)))
        (let ((v-box (make-instance 'gtk:v-box))
              (search-box (make-instance 'gtk:h-box)))
          (gtk:container-add window v-box)
          (gtk:box-pack-start v-box search-box :expand nil)
          (gtk:box-pack-start search-box search-entry)
          (gtk:box-pack-start search-box search-button :expand nil)
          (gtk:box-pack-start v-box scroll)
          (gtk:container-add scroll slots-list))
        (gtk:store-add-column slots-model "gchararray"
                              (lambda (slot)
                                (format nil "~S" (closer-mop:slot-definition-name slot))))
        (let ((col (make-instance 'gtk:tree-view-column :title "Slot name"))
              (cr (make-instance 'gtk:cell-renderer-text)))
          (gtk:tree-view-column-pack-start col cr)
          (gtk:tree-view-column-add-attribute col cr "text" 0)
          (gtk:tree-view-append-column slots-list col))
        (labels ((display-class-slots (class)
                   (format output "Displaying ~A~%" class)
                   (loop
                      repeat (gtk:store-items-count slots-model)
                      do (gtk:store-remove-item slots-model (gtk:store-item slots-model 0)))
                   (closer-mop:finalize-inheritance class)
                   (loop
                      for slot in (closer-mop:class-slots class)
                      do (gtk:store-add-item slots-model slot)))
                 (on-search-clicked (button)
                   (declare (ignore button))
                   (gtk:with-gtk-message-error-handler
                     (let* ((class-name (read-from-string (gtk:entry-text search-entry)))
                            (class (find-class class-name)))
                       (display-class-slots class)))))
          (gobject:g-signal-connect search-button "clicked" #'on-search-clicked))
        (gtk:widget-show window)))))

(demo-class-browser)