Comments (5)
bohonghuang
commented on July 19, 2024
1
I just don't quite understand the purpose of the line
(tg:cancel-finalization string-list)in the callback, it seems to work the same without it.
In general, cl-gobject-introspection adds a finalizer for each GObject, allowing Lisp to modify the reference count of the GObject during garbage collection to correctly free memory. However, the caller of TreeListModelCreateModelFunc takes ownership of the returned object. If Lisp tries decreasing the reference count of this object when the caller has already destroyed it during garbage collection, memory issues may occur.
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bohonghuang
commented on July 19, 2024
the CFFI callback seems to cause an internal floating point error with SBCL
It's strange that I haven't encountered this situation in my environment, but you can execute the following code before running the GTK application to avoid this problem:
(sb-int:set-floating-point-modes :traps nil)from cl-gtk4.
bohonghuang
commented on July 19, 2024
I also can't figure out how to return a pointer to the child model from the
GtkTreeListModelCreateModelFunccallback
The glib::put-object and glib::get-object functions simply utilize the additional parameter of the callback (i.e., a numerical value of a C pointer) to pass arbitrary Lisp objects. The pointers themselves used in these functions are meaningless. I have made some modifications to the example for your reference:
(defstruct product-info
name cost sale subseries)
(cffi:defcallback tree-list-model-create-model-func :pointer ((item :pointer) (user-data :pointer))
(destructuring-bind (product-table . build-uuid-string-list)
(glib::get-object (cffi:pointer-address user-data))
(if (cffi:null-pointer-p item) (cffi:null-pointer)
(let* ((uuid (string-object-string (gobj:pointer-object item 'string-object)))
(product (gethash uuid product-table))
(string-list (funcall build-uuid-string-list (product-info-subseries product))))
(tg:cancel-finalization string-list)
(gobj:object-pointer string-list)))))
(define-application (:name closting :id "com.closting")
(define-main-window (window (make-application-window :application *application*))
(let* ((product-table (make-hash-table :test #'equal))
(build-uuid-string-list (lambda (products)
(loop :for product :in products
:for uuid := (prin1-to-string (uuid:make-v1-uuid))
:do (setf (gethash uuid product-table) product)
:collect uuid :into uuids
:finally (return (gtk:make-string-list :strings uuids)))))
(root-model (funcall build-uuid-string-list (list (make-product-info :name "iPhone 15"
:cost "799$"
:sale "899$"
:subseries (list (make-product-info
:name "iPhone 15 Pro"
:cost "899$"
:sale "999$")
(make-product-info
:name "iPhone 15 Pro Max"
:cost "1099$"
:sale "1199$")))
(make-product-info :name "Infinix S90" :cost "40$" :sale "60$" :subseries nil)
(make-product-info :name "Casio Calculator" :cost "50$" :sale "80$" :subseries nil))))
(tree-list-model (make-tree-list-model :root (make-multi-selection :model root-model)
:passthrough nil
:autoexpand nil
:create-func (cffi:callback tree-list-model-create-model-func)
:user-data (cffi:make-pointer (glib::put-object (cons product-table build-uuid-string-list)))
:user-destroy (cffi:callback glib::free-object-callback)))
(column-view (make-column-view :model (make-single-selection :model tree-list-model))))
(mapc (lambda (name accessor)
(let* ((factory (make-signal-list-item-factory))
(col (make-column-view-column :title name :factory factory)))
(flet ((setup (factory item) (declare (ignore factory))
(let ((expander (make-tree-expander))
(label (make-label :str "")))
(setf (tree-expander-child expander) label
(list-item-child item) expander)))
(bind (factory item) (declare (ignore factory))
(let* ((row (gobj:coerce (list-item-item item) 'tree-list-row))
(uuid (string-object-string (gobj:coerce (tree-list-row-item row) 'string-object)))
(expander (gobj:coerce (list-item-child item) 'tree-expander))
(label (gobj:coerce (tree-expander-child expander) 'label)))
(when (string= name "Name")
(setf (tree-expander-list-row expander) row))
(setf (label-text label) (princ-to-string (funcall accessor (gethash uuid product-table)))))))
(connect factory "setup" #'setup)
(connect factory "bind" #'bind))
(column-view-append-column column-view col)))
(list "Name" "Cost" "Sale")
(list #'product-info-name #'product-info-cost #'product-info-sale))
(setf (widget-vexpand-p column-view) t
(widget-hexpand-p column-view) t
(window-title window) "Closting"
(window-child window) column-view)
(unless (widget-visible-p window)
(window-present window)))))It appears to be working well:
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seigakaku
commented on July 19, 2024
Your example worked perfectly under both CCL and SBCL, thank you.
I still got the floating point error under SBCL, but running (sb-int:set-floating-point-modes :traps nil) got rid of it.
I just don't quite understand the purpose of the line (tg:cancel-finalization string-list) in the callback, it seems to work the same without it.
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seigakaku
commented on July 19, 2024
I understand now, thank you for explaining, I'll close the issue now.
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