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2008-10-16 Emmanuele Bassi <ebassi@linux.intel.com>

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* clutter/clutter-container.[ch]: Add checks to the Container
	interface invocation methods, to avoid crashing or corrupting
	the stack when an actor does not implement every virtual
	function of the Container interface vtable. GObject allows this
	to happen so we must handle the case gracefully. This also means
	that we can classify some virtual function as mandatory (as is
	the case for ::add, ::remove and ::foreach) and some other
	optional.
This commit is contained in:
Emmanuele Bassi 2008-10-16 10:28:17 +00:00
parent 3d08e5f3d2
commit 6d4667cb61
3 changed files with 111 additions and 35 deletions
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11
ChangeLog
View file

@ -1,3 +1,14 @@
2008-10-16 Emmanuele Bassi <ebassi@linux.intel.com>
* clutter/clutter-container.[ch]: Add checks to the Container
interface invocation methods, to avoid crashing or corrupting
the stack when an actor does not implement every virtual
function of the Container interface vtable. GObject allows this
to happen so we must handle the case gracefully. This also means
that we can classify some virtual function as mandatory (as is
the case for ::add, ::remove and ::foreach) and some other
optional.
2008-10-08 Emmanuele Bassi <ebassi@linux.intel.com>
* tests/test-depth.c (raise_top), (main): Fix a shadowing

119
clutter/clutter-container.c
View file

@ -43,6 +43,23 @@
#include "clutter-private.h"
#include "clutter-enum-types.h"
#define CLUTTER_CONTAINER_WARN_NOT_IMPLEMENTED(container,vfunc) \
G_STMT_START { \
g_warning ("Container of type `%s' does not implement " \
"the required ClutterContainer::%s virtual " \
"function.", \
G_OBJECT_TYPE_NAME ((container)), \
(vfunc)); \
} G_STMT_END
#define CLUTTER_CONTAINER_NOTE_NOT_IMPLEMENTED(container,vfunc) \
G_STMT_START { \
CLUTTER_NOTE (ACTOR, "Container of type `%s' does not " \
"implement the ClutterContainer::%s " \
"virtual function.", \
G_OBJECT_TYPE_NAME ((container)), \
(vfunc)); \
} G_STMT_END
/**
* SECTION:clutter-container
@ -69,24 +86,17 @@ enum
static guint container_signals[LAST_SIGNAL] = { 0, };
static GQuark quark_child_meta = 0;
static ClutterChildMeta *
get_child_meta (ClutterContainer *container,
ClutterActor *actor);
static ClutterChildMeta *get_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void create_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void destroy_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
create_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
destroy_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
clutter_container_create_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
clutter_container_destroy_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void clutter_container_create_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void clutter_container_destroy_child_meta (ClutterContainer *container,
ClutterActor *actor);
static void
@ -178,7 +188,7 @@ clutter_container_get_type (void)
if (G_UNLIKELY (!container_type))
{
GTypeInfo container_info =
const GTypeInfo container_info =
{
sizeof (ClutterContainerIface),
clutter_container_base_init,
@ -239,17 +249,25 @@ void
clutter_container_add_actor (ClutterContainer *container,
ClutterActor *actor)
{
ClutterContainerIface *iface;
ClutterActor *parent;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->add)
{
CLUTTER_CONTAINER_WARN_NOT_IMPLEMENTED (container, "add");
return;
}
parent = clutter_actor_get_parent (actor);
if (parent)
{
g_warning ("Attempting to add actor of type `%s' to a "
"group of type `%s', but the actor has already "
"a parent of type `%s'.",
"container of type `%s', but the actor has "
"already a parent of type `%s'.",
g_type_name (G_OBJECT_TYPE (actor)),
g_type_name (G_OBJECT_TYPE (container)),
g_type_name (G_OBJECT_TYPE (parent)));
@ -257,7 +275,8 @@ clutter_container_add_actor (ClutterContainer *container,
}
clutter_container_create_child_meta (container, actor);
CLUTTER_CONTAINER_GET_IFACE (container)->add (container, actor);
iface->add (container, actor);
}
/**
@ -333,24 +352,33 @@ void
clutter_container_remove_actor (ClutterContainer *container,
ClutterActor *actor)
{
ClutterContainerIface *iface;
ClutterActor *parent;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->remove)
{
CLUTTER_CONTAINER_WARN_NOT_IMPLEMENTED (container, "remove");
return;
}
parent = clutter_actor_get_parent (actor);
if (parent != CLUTTER_ACTOR (container))
{
g_warning ("Attempting to remove actor of type `%s' from "
"group of class `%s', but the group is not the "
"actor's parent.",
"group of class `%s', but the container is not "
"the actor's parent.",
g_type_name (G_OBJECT_TYPE (actor)),
g_type_name (G_OBJECT_TYPE (container)));
return;
}
clutter_container_destroy_child_meta (container, actor);
CLUTTER_CONTAINER_GET_IFACE (container)->remove (container, actor);
iface->remove (container, actor);
}
/**
@ -429,12 +457,19 @@ clutter_container_foreach (ClutterContainer *container,
ClutterCallback callback,
gpointer user_data)
{
ClutterContainerIface *iface;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (callback != NULL);
CLUTTER_CONTAINER_GET_IFACE (container)->foreach (container,
callback,
user_data);
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->foreach)
{
CLUTTER_CONTAINER_WARN_NOT_IMPLEMENTED (container, "foreach");
return;
}
iface->foreach (container, callback, user_data);
}
/**
@ -452,10 +487,19 @@ clutter_container_raise_child (ClutterContainer *container,
ClutterActor *actor,
ClutterActor *sibling)
{
ClutterContainerIface *iface;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
g_return_if_fail (sibling == NULL || CLUTTER_IS_ACTOR (sibling));
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->raise)
{
CLUTTER_CONTAINER_NOTE_NOT_IMPLEMENTED (container, "raise");
return;
};
if (actor == sibling)
return;
@ -478,7 +522,7 @@ clutter_container_raise_child (ClutterContainer *container,
return;
}
CLUTTER_CONTAINER_GET_IFACE (container)->raise (container, actor, sibling);
iface->raise (container, actor, sibling);
}
/**
@ -496,10 +540,19 @@ clutter_container_lower_child (ClutterContainer *container,
ClutterActor *actor,
ClutterActor *sibling)
{
ClutterContainerIface *iface;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
g_return_if_fail (sibling == NULL || CLUTTER_IS_ACTOR (sibling));
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (!iface->lower)
{
CLUTTER_CONTAINER_NOTE_NOT_IMPLEMENTED (container, "lower");
return;
}
if (actor == sibling)
return;
@ -522,7 +575,7 @@ clutter_container_lower_child (ClutterContainer *container,
return;
}
CLUTTER_CONTAINER_GET_IFACE (container)->lower (container, actor, sibling);
iface->lower (container, actor, sibling);
}
/**
@ -537,9 +590,15 @@ clutter_container_lower_child (ClutterContainer *container,
void
clutter_container_sort_depth_order (ClutterContainer *container)
{
ClutterContainerIface *iface;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
CLUTTER_CONTAINER_GET_IFACE (container)->sort_depth_order (container);
iface = CLUTTER_CONTAINER_GET_IFACE (container);
if (iface->sort_depth_order)
iface->sort_depth_order (container);
else
CLUTTER_CONTAINER_NOTE_NOT_IMPLEMENTED (container, "sort_depth_order");
}
/**

16
clutter/clutter-container.h
View file

@ -44,9 +44,12 @@ typedef struct _ClutterContainerIface ClutterContainerIface;
/**
* ClutterContainerIface:
* @add: virtual function for adding an actor to the container
* @remove: virtual function for removing an actor from the container
* @foreach: virtual function for iterating over the container's children
* @add: virtual function for adding an actor to the container. The
* implementation of this virtual function is required.
* @remove: virtual function for removing an actor from the container. The
* implementation of this virtual function is required.
* @foreach: virtual function for iterating over the container's children.
* The implementation of this virtual function is required.
* @raise: virtual function for raising a child
* @lower: virtual function for lowering a child
* @sort_depth_order: virtual function for sorting the children of a
@ -65,7 +68,9 @@ typedef struct _ClutterContainerIface ClutterContainerIface;
* @actor_removed: class handler for #ClutterContainer::actor_removed
* @child_notify: class handler for #ClutterContainer::child-notify
*
* Base interface for container actors.
* Base interface for container actors. The @add, @remove and @foreach
* virtual functions must be provided by any implementation; the other
* virtual functions are optional.
*
* Since: 0.4
*/
@ -82,6 +87,8 @@ struct _ClutterContainerIface
void (* foreach) (ClutterContainer *container,
ClutterCallback callback,
gpointer user_data);
/* child stacking */
void (* raise) (ClutterContainer *container,
ClutterActor *actor,
ClutterActor *sibling);
@ -91,7 +98,6 @@ struct _ClutterContainerIface
void (* sort_depth_order) (ClutterContainer *container);
/* ClutterChildMeta management */
GType child_meta_type;
void (* create_child_meta) (ClutterContainer *container,
ClutterActor *actor);