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layout: Add layout properties introspection

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In order to know if a layout property exists and retrieve its
description in form of a GParamSpec, we need a wrapper API inside
ClutterLayoutManager. This allows introspecting a LayoutManager
sub-class and eventually serialize and deserialize it.
This commit is contained in:
Emmanuele Bassi 2009-11-05 12:24:37 +00:00
parent b0c9de2730
commit c3368c0d15
2 changed files with 127 additions and 46 deletions
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76
clutter/clutter-layout-manager.c
View file

@ -913,3 +913,79 @@ clutter_layout_manager_child_get_property (ClutterLayoutManager *manager,
layout_get_property_internal (manager, G_OBJECT (meta), pspec, value);
}
/**
* clutter_layout_manager_find_child_property:
* @manager: a #ClutterLayoutManager
* @name: the name of the property
*
* Retrieves the #GParamSpec for the layout property @name inside
* the #ClutterLayoutMeta sub-class used by @manager
*
* Return value: (transfer none): a #GParamSpec describing the property,
* or %NULL if no property with that name exists. The returned
* #GParamSpec is owned by the layout manager and should not be
* modified or freed
*
* Since: 1.2
*/
GParamSpec *
clutter_layout_manager_find_child_property (ClutterLayoutManager *manager,
const gchar *name)
{
ClutterLayoutManagerClass *klass;
GObjectClass *meta_klass;
GParamSpec *pspec;
GType meta_type;
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
meta_type = klass->get_child_meta_type (manager);
if (meta_type == G_TYPE_INVALID)
return NULL;
meta_klass = g_type_class_ref (meta_type);
pspec = g_object_class_find_property (meta_klass, name);
g_type_class_unref (meta_klass);
return pspec;
}
/**
* clutter_layout_manager_list_child_properties:
* @manager: a #ClutterLayoutManager
* @n_pspecs: (out): return location for the number of returned
* #GParamSpec<!-- -->s
*
* Retrieves all the #GParamSpec<!-- -->s for the layout properties
* stored inside the #ClutterLayoutMeta sub-class used by @manager
*
* Return value: (transfer full): the newly-allocated, %NULL-terminated
* array of #GParamSpec<!-- -->s. Use g_free() to free the resources
* allocated for the array
*
* Since: 1.2
*/
GParamSpec **
clutter_layout_manager_list_child_properties (ClutterLayoutManager *manager,
guint *n_pspecs)
{
ClutterLayoutManagerClass *klass;
GObjectClass *meta_klass;
GParamSpec **pspecs;
GType meta_type;
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
meta_type = klass->get_child_meta_type (manager);
if (meta_type == G_TYPE_INVALID)
return NULL;
meta_klass = g_type_class_ref (meta_type);
pspecs = g_object_class_list_properties (meta_klass, n_pspecs);
g_type_class_unref (meta_klass);
return pspecs;
}

5
clutter/clutter-layout-manager.h
View file

@ -154,6 +154,11 @@ void clutter_layout_manager_set_container (ClutterLayoutMan
ClutterContainer *container);
void clutter_layout_manager_layout_changed (ClutterLayoutManager *manager);
GParamSpec * clutter_layout_manager_find_child_property (ClutterLayoutManager *manager,
const gchar *name);
GParamSpec ** clutter_layout_manager_list_child_properties (ClutterLayoutManager *manager,
guint *n_pspecs);
ClutterLayoutMeta *clutter_layout_manager_get_child_meta (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor);