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Add gtk_widget_clear_template()

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The dual of gtk_widget_init_template(), which should be used to clear
the template data associated with a specific GtkWidget type.
This commit is contained in:
Emmanuele Bassi 2022-05-16 14:10:20 +01:00
parent 6368278005
commit 7857c1a66b
2 changed files with 76 additions and 10 deletions
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83
gtk/gtkwidget.c
View File

@ -7437,16 +7437,7 @@ gtk_widget_real_destroy (GtkWidget *object)
GObject *child_object = gtk_widget_get_template_child (widget,
class_type,
child_class->name);
g_assert (child_object);
if (!G_IS_OBJECT (child_object))
{
g_critical ("Automated component '%s' of class '%s' seems to"
" have been prematurely finalized",
child_class->name, g_type_name (class_type));
}
else
if (G_IS_OBJECT (child_object))
{
FinalizeAssertion *assertion = g_slice_new0 (FinalizeAssertion);
assertion->child_class = child_class;
@ -10978,6 +10969,78 @@ out:
g_object_unref (builder);
}
/**
* gtk_widget_clear_template:
* @widget: the widget with a template
* @widget_type: the type of the widget to finalize the template for
*
* Clears the template data for the given widget.
*
* This function is the opposite of [method@Gtk.Widget.init_template], and
* it is used to clear all the template data from a widget instance.
*
* You should call this function inside the `GObjectClass.dispose()`
* implementation of any widget that called `gtk_widget_init_template()`.
* Typically, you will want to call this function last, right before
* chaining up to the parent type's dispose implementation, e.g.
*
* ```c
* static void
* some_widget_dispose (GObject *gobject)
* {
* SomeWidget *self = SOME_WIDGET (gobject);
*
* // Clear the template data for SomeWidget
* gtk_widget_clear_template (GTK_WIDGET (self), SOME_TYPE_WIDGET);
*
* G_OBJECT_CLASS (some_widget_parent_class)->dispose (gobject);
* }
* ```
*
* Since: 4.8
*/
void
gtk_widget_clear_template (GtkWidget *widget,
GType widget_type)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (g_type_name (widget_type) != NULL);
GtkWidgetTemplate *template = GTK_WIDGET_GET_CLASS (widget)->priv->template;
g_return_if_fail (template != NULL);
/* Tear down the automatic child data */
GHashTable *auto_child_hash = get_auto_child_hash (widget, widget_type, FALSE);
for (GSList *l = template->children; l != NULL; l = l->next)
{
AutomaticChildClass *child_class = l->data;
/* This will drop the reference on the template children */
if (auto_child_hash != NULL)
{
gpointer child = g_hash_table_lookup (auto_child_hash, child_class->name);
g_assert (child != NULL);
/* We have to explicitly unparent direct children of this widget */
if (GTK_IS_WIDGET (child) && _gtk_widget_get_parent (child) == widget)
gtk_widget_unparent (child);
g_hash_table_remove (auto_child_hash, child_class->name);
}
/* Nullify the field last, to avoid re-entrancy issues */
if (child_class->offset != 0)
{
gpointer field_p;
field_p = G_STRUCT_MEMBER_P (widget, child_class->offset);
(* (gpointer *) field_p) = NULL;
}
}
}
/**
* gtk_widget_class_set_template:
* @widget_class: A `GtkWidgetClass`

3
gtk/gtkwidget.h
View File

@ -833,6 +833,9 @@ GDK_AVAILABLE_IN_ALL
GObject *gtk_widget_get_template_child (GtkWidget *widget,
GType widget_type,
const char *name);
GDK_AVAILABLE_IN_4_8
void gtk_widget_clear_template (GtkWidget *widget,
GType widget_type);
GDK_AVAILABLE_IN_ALL
void gtk_widget_class_set_template (GtkWidgetClass *widget_class,
GBytes *template_bytes);