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mutter/clutter/clutter-script.c
Emmanuele Bassi 1912f28063 docs: Remove leftover DocBook tags 
We use markdown for the documentation.
2015-03-12 20:22:57 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
/**
* SECTION:clutter-script
* @short_description: Loads a scene from UI definition data
*
* #ClutterScript is an object used for loading and building parts or a
* complete scenegraph from external definition data in forms of string
* buffers or files.
*
* The UI definition format is JSON, the JavaScript Object Notation as
* described by RFC 4627. #ClutterScript can load a JSON data stream,
* parse it and build all the objects defined into it. Each object must
* have an "id" and a "type" properties defining the name to be used
* to retrieve it from #ClutterScript with clutter_script_get_object(),
* and the class type to be instanciated. Every other attribute will
* be mapped to the class properties.
*
* A #ClutterScript holds a reference on every object it creates from
* the definition data, except for the stage. Every non-actor object
* will be finalized when the #ClutterScript instance holding it will
* be finalized, so they need to be referenced using g_object_ref() in
* order for them to survive.
*
* A simple object might be defined as:
*
* <informalexample><programlisting><![CDATA[
* {
* "id" : "red-button",
* "type" : "ClutterRectangle",
* "width" : 100,
* "height" : 100,
* "color" : "&num;ff0000ff"
* }
* ]]></programlisting></informalexample>
*
* This will produce a red #ClutterRectangle, 100x100 pixels wide, and
* with a ClutterScript id of "red-button"; it can be retrieved by calling:
*
* |[
* ClutterActor *red_button;
*
* red_button = CLUTTER_ACTOR (clutter_script_get_object (script, "red-button"));
* ]|
*
* and then manipulated with the Clutter API. For every object created
* using ClutterScript it is possible to check the id by calling
* clutter_get_script_id().
*
* Packing can be represented using the "children" member, and passing an
* array of objects or ids of objects already defined (but not packed: the
* packing rules of Clutter still apply, and an actor cannot be packed
* in multiple containers without unparenting it in between).
*
* Behaviours and timelines can also be defined inside a UI definition
* buffer:
*
* <informalexample><programlisting><![CDATA[
* {
* "id" : "rotate-behaviour",
* "type" : "ClutterBehaviourRotate",
* "angle-start" : 0.0,
* "angle-end" : 360.0,
* "axis" : "z-axis",
* "alpha" : {
* "timeline" : { "duration" : 4000, "loop" : true },
* "mode" : "easeInSine"
* }
* }
* ]]></programlisting></informalexample>
*
* And then to apply a defined behaviour to an actor defined inside the
* definition of an actor, the "behaviour" member can be used:
*
* <informalexample><programlisting><![CDATA[
* {
* "id" : "my-rotating-actor",
* "type" : "ClutterTexture",
* ...
* "behaviours" : [ "rotate-behaviour" ]
* }
* ]]></programlisting></informalexample>
*
* A #ClutterAlpha belonging to a #ClutterBehaviour can only be defined
* implicitly like in the example above, or explicitly by setting the
* "alpha" property to point to a previously defined #ClutterAlpha, e.g.:
*
* <informalexample><programlisting><![CDATA[
* {
* "id" : "rotate-behaviour",
* "type" : "ClutterBehaviourRotate",
* "angle-start" : 0.0,
* "angle-end" : 360.0,
* "axis" : "z-axis",
* "alpha" : {
* "id" : "rotate-alpha",
* "type" : "ClutterAlpha",
* "timeline" : {
* "id" : "rotate-timeline",
* "type : "ClutterTimeline",
* "duration" : 4000,
* "loop" : true
* },
* "function" : "custom_sine_alpha"
* }
* }
* ]]></programlisting></informalexample>
*
* Implicitely defined #ClutterAlpha<!-- -->s and #ClutterTimeline<!-- -->s
* can omit the `id`, as well as the `type` members, but will not be available
* using clutter_script_get_object() (they can, however, be extracted using the
* #ClutterBehaviour and #ClutterAlpha API respectively).
*
* Signal handlers can be defined inside a Clutter UI definition file and
* then autoconnected to their respective signals using the
* clutter_script_connect_signals() function:
*
* <informalexample><programlisting><![CDATA[
* ...
* "signals" : [
* { "name" : "button-press-event", "handler" : "on_button_press" },
* {
* "name" : "foo-signal",
* "handler" : "after_foo",
* "after" : true
* },
* ],
* ...
* ]]></programlisting></informalexample>
*
* Signal handler definitions must have a "name" and a "handler" members;
* they can also have the "after" and "swapped" boolean members (for the
* signal connection flags %G_CONNECT_AFTER and %G_CONNECT_SWAPPED
* respectively) and the "object" string member for calling
* g_signal_connect_object() instead of g_signal_connect().
*
* Signals can also be directly attached to a specific state defined
* inside a #ClutterState instance, for instance:
*
* |[
* ...
* "signals" : [
* {
* "name" : "enter-event",
* "states" : "button-states",
* "target-state" : "hover"
* },
* {
* "name" : "leave-event",
* "states" : "button-states",
* "target-state" : "base"
* },
* {
* "name" : "button-press-event",
* "states" : "button-states",
* "target-state" : "active",
* },
* {
* "name" : "key-press-event",
* "states" : "button-states",
* "target-state" : "key-focus",
* "warp" : true
* }
* ],
* ...
* ]|
*
* The "states" key defines the #ClutterState instance to be used to
* resolve the "target-state" key; it can be either a script id for a
* #ClutterState built by the same #ClutterScript instance, or to a
* #ClutterState built in code and associated to the #ClutterScript
* instance through the clutter_script_add_states() function. If no
* "states" key is present, then the default #ClutterState associated to
* the #ClutterScript instance will be used; the default #ClutterState
* can be set using clutter_script_add_states() using a %NULL name. The
* "warp" key can be used to warp to a specific state instead of
* animating to it. State changes on signal emission will not affect
* the signal emission chain.
*
* Clutter reserves the following names, so classes defining properties
* through the usual GObject registration process should avoid using these
* names to avoid collisions:
*
* <programlisting><![CDATA[
* "id" := the unique name of a ClutterScript object
* "type" := the class literal name, also used to infer the type
* function
* "type_func" := the GType function name, for non-standard classes
* "children" := an array of names or objects to add as children
* "behaviours" := an array of names or objects to apply to an actor
* "signals" := an array of signal definitions to connect to an object
* "is-default" := a boolean flag used when defining the #ClutterStage;
* if set to "true" the default stage will be used instead
* of creating a new #ClutterStage instance
* ]]></programlisting>
*
* #ClutterScript is available since Clutter 0.6
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <glib.h>
#include <glib-object.h>
#include <gmodule.h>
#define CLUTTER_DISABLE_DEPRECATION_WARNINGS
#include "clutter-actor.h"
#include "clutter-stage.h"
#include "clutter-texture.h"
#include "clutter-script.h"
#include "clutter-script-private.h"
#include "clutter-scriptable.h"
#include "clutter-enum-types.h"
#include "clutter-private.h"
#include "clutter-debug.h"
#include "deprecated/clutter-alpha.h"
#include "deprecated/clutter-behaviour.h"
#include "deprecated/clutter-container.h"
#include "deprecated/clutter-state.h"
enum
{
PROP_0,
PROP_FILENAME_SET,
PROP_FILENAME,
PROP_TRANSLATION_DOMAIN,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST];
#define CLUTTER_SCRIPT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_SCRIPT, ClutterScriptPrivate))
struct _ClutterScriptPrivate
{
GHashTable *objects;
guint last_merge_id;
guint last_unknown;
ClutterScriptParser *parser;
GHashTable *states;
gchar **search_paths;
gchar *translation_domain;
gchar *filename;
guint is_filename : 1;
};
G_DEFINE_TYPE_WITH_PRIVATE (ClutterScript, clutter_script, G_TYPE_OBJECT)
static GType
clutter_script_real_get_type_from_name (ClutterScript *script,
const gchar *type_name)
{
GType gtype;
gtype = g_type_from_name (type_name);
if (gtype != G_TYPE_INVALID)
return gtype;
return _clutter_script_get_type_from_class (type_name);
}
void
property_info_free (gpointer data)
{
if (G_LIKELY (data))
{
PropertyInfo *pinfo = data;
if (pinfo->node)
json_node_free (pinfo->node);
if (pinfo->pspec)
g_param_spec_unref (pinfo->pspec);
g_free (pinfo->name);
g_slice_free (PropertyInfo, pinfo);
}
}
static void
signal_info_free (gpointer data)
{
if (G_LIKELY (data))
{
SignalInfo *sinfo = data;
g_free (sinfo->name);
g_free (sinfo->handler);
g_free (sinfo->object);
g_free (sinfo->state);
g_free (sinfo->target);
g_slice_free (SignalInfo, sinfo);
}
}
void
object_info_free (gpointer data)
{
if (G_LIKELY (data))
{
ObjectInfo *oinfo = data;
g_free (oinfo->id);
g_free (oinfo->class_name);
g_free (oinfo->type_func);
g_list_foreach (oinfo->properties, (GFunc) property_info_free, NULL);
g_list_free (oinfo->properties);
g_list_foreach (oinfo->signals, (GFunc) signal_info_free, NULL);
g_list_free (oinfo->signals);
/* these are ids */
g_list_foreach (oinfo->children, (GFunc) g_free, NULL);
g_list_free (oinfo->children);
/* we unref top-level objects and leave the actors alone,
* unless we are unmerging in which case we have to destroy
* the actor to unparent them
*/
if (oinfo->object != NULL)
{
if (oinfo->is_unmerged)
{
if (oinfo->is_actor && !oinfo->is_stage)
clutter_actor_destroy (CLUTTER_ACTOR (oinfo->object));
}
g_object_unref (oinfo->object);
oinfo->object = NULL;
}
g_slice_free (ObjectInfo, oinfo);
}
}
static void
clutter_script_finalize (GObject *gobject)
{
ClutterScriptPrivate *priv = CLUTTER_SCRIPT_GET_PRIVATE (gobject);
g_object_unref (priv->parser);
g_hash_table_destroy (priv->objects);
g_strfreev (priv->search_paths);
g_free (priv->filename);
g_hash_table_destroy (priv->states);
g_free (priv->translation_domain);
G_OBJECT_CLASS (clutter_script_parent_class)->finalize (gobject);
}
static void
clutter_script_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterScript *script = CLUTTER_SCRIPT (gobject);
switch (prop_id)
{
case PROP_TRANSLATION_DOMAIN:
clutter_script_set_translation_domain (script, g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_script_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterScript *script = CLUTTER_SCRIPT (gobject);
switch (prop_id)
{
case PROP_FILENAME_SET:
g_value_set_boolean (value, script->priv->is_filename);
break;
case PROP_FILENAME:
g_value_set_string (value, script->priv->filename);
break;
case PROP_TRANSLATION_DOMAIN:
g_value_set_string (value, script->priv->translation_domain);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_script_class_init (ClutterScriptClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
klass->get_type_from_name = clutter_script_real_get_type_from_name;
/**
* ClutterScript:filename-set:
*
* Whether the #ClutterScript:filename property is set. If this property
* is %TRUE then the currently parsed data comes from a file, and the
* file name is stored inside the #ClutterScript:filename property.
*
* Since: 0.6
*/
obj_props[PROP_FILENAME_SET] =
g_param_spec_boolean ("filename-set",
P_("Filename Set"),
P_("Whether the :filename property is set"),
FALSE,
CLUTTER_PARAM_READABLE);
/**
* ClutterScript:filename:
*
* The path of the currently parsed file. If #ClutterScript:filename-set
* is %FALSE then the value of this property is undefined.
*
* Since: 0.6
*/
obj_props[PROP_FILENAME] =
g_param_spec_string ("filename",
P_("Filename"),
P_("The path of the currently parsed file"),
NULL,
CLUTTER_PARAM_READABLE);
/**
* ClutterScript:translation-domain:
*
* The translation domain, used to localize strings marked as translatable
* inside a UI definition.
*
* If #ClutterScript:translation-domain is set to %NULL, #ClutterScript
* will use gettext(), otherwise g_dgettext() will be used.
*
* Since: 1.10
*/
obj_props[PROP_TRANSLATION_DOMAIN] =
g_param_spec_string ("translation-domain",
P_("Translation Domain"),
P_("The translation domain used to localize string"),
NULL,
CLUTTER_PARAM_READWRITE);
gobject_class->set_property = clutter_script_set_property;
gobject_class->get_property = clutter_script_get_property;
gobject_class->finalize = clutter_script_finalize;
g_object_class_install_properties (gobject_class,
PROP_LAST,
obj_props);
}
static void
clutter_script_init (ClutterScript *script)
{
ClutterScriptPrivate *priv;
script->priv = priv = clutter_script_get_instance_private (script);
priv->parser = g_object_new (CLUTTER_TYPE_SCRIPT_PARSER, NULL);
priv->parser->script = script;
priv->is_filename = FALSE;
priv->last_merge_id = 0;
priv->objects = g_hash_table_new_full (g_str_hash, g_str_equal,
NULL,
object_info_free);
priv->states = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free,
(GDestroyNotify) g_object_unref);
}
/**
* clutter_script_new:
*
* Creates a new #ClutterScript instance. #ClutterScript can be used
* to load objects definitions for scenegraph elements, like actors,
* or behavioural elements, like behaviours and timelines. The
* definitions must be encoded using the JavaScript Object Notation (JSON)
* language.
*
* Return value: the newly created #ClutterScript instance. Use
* g_object_unref() when done.
*
* Since: 0.6
*/
ClutterScript *
clutter_script_new (void)
{
return g_object_new (CLUTTER_TYPE_SCRIPT, NULL);
}
/**
* clutter_script_load_from_file:
* @script: a #ClutterScript
* @filename: the full path to the definition file
* @error: return location for a #GError, or %NULL
*
* Loads the definitions from @filename into @script and merges with
* the currently loaded ones, if any.
*
* Return value: on error, zero is returned and @error is set
* accordingly. On success, the merge id for the UI definitions is
* returned. You can use the merge id with clutter_script_unmerge_objects().
*
* Since: 0.6
*/
guint
clutter_script_load_from_file (ClutterScript *script,
const gchar *filename,
GError **error)
{
ClutterScriptPrivate *priv;
GError *internal_error;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), 0);
g_return_val_if_fail (filename != NULL, 0);
priv = script->priv;
g_free (priv->filename);
priv->filename = g_strdup (filename);
priv->is_filename = TRUE;
priv->last_merge_id += 1;
internal_error = NULL;
json_parser_load_from_file (JSON_PARSER (priv->parser),
filename,
&internal_error);
if (internal_error)
{
g_propagate_error (error, internal_error);
priv->last_merge_id -= 1;
return 0;
}
return priv->last_merge_id;
}
/**
* clutter_script_load_from_data:
* @script: a #ClutterScript
* @data: a buffer containing the definitions
* @length: the length of the buffer, or -1 if @data is a NUL-terminated
* buffer
* @error: return location for a #GError, or %NULL
*
* Loads the definitions from @data into @script and merges with
* the currently loaded ones, if any.
*
* Return value: on error, zero is returned and @error is set
* accordingly. On success, the merge id for the UI definitions is
* returned. You can use the merge id with clutter_script_unmerge_objects().
*
* Since: 0.6
*/
guint
clutter_script_load_from_data (ClutterScript *script,
const gchar *data,
gssize length,
GError **error)
{
ClutterScriptPrivate *priv;
GError *internal_error;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), 0);
g_return_val_if_fail (data != NULL, 0);
if (length < 0)
length = strlen (data);
priv = script->priv;
g_free (priv->filename);
priv->filename = NULL;
priv->is_filename = FALSE;
priv->last_merge_id += 1;
internal_error = NULL;
json_parser_load_from_data (JSON_PARSER (priv->parser),
data, length,
&internal_error);
if (internal_error)
{
g_propagate_error (error, internal_error);
priv->last_merge_id -= 1;
return 0;
}
return priv->last_merge_id;
}
/**
* clutter_script_load_from_resource:
* @script: a #ClutterScript
* @resource_path: the resource path of the file to parse
* @error: return location for a #GError, or %NULL
*
* Loads the definitions from a resource file into @script and merges with
* the currently loaded ones, if any.
*
* Return value: on error, zero is returned and @error is set
* accordingly. On success, the merge id for the UI definitions is
* returned. You can use the merge id with clutter_script_unmerge_objects().
*
* Since: 1.10
*/
guint
clutter_script_load_from_resource (ClutterScript *script,
const gchar *resource_path,
GError **error)
{
GBytes *data;
guint res;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), 0);
data = g_resources_lookup_data (resource_path, 0, error);
if (data == NULL)
return 0;
res = clutter_script_load_from_data (script,
g_bytes_get_data (data, NULL),
g_bytes_get_size (data),
error);
g_bytes_unref (data);
return res;
}
/**
* clutter_script_get_object:
* @script: a #ClutterScript
* @name: the name of the object to retrieve
*
* Retrieves the object bound to @name. This function does not increment
* the reference count of the returned object.
*
* Return value: (transfer none): the named object, or %NULL if no object
* with the given name was available
*
* Since: 0.6
*/
GObject *
clutter_script_get_object (ClutterScript *script,
const gchar *name)
{
ObjectInfo *oinfo;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), NULL);
g_return_val_if_fail (name != NULL, NULL);
oinfo = g_hash_table_lookup (script->priv->objects, name);
if (!oinfo)
return NULL;
_clutter_script_construct_object (script, oinfo);
_clutter_script_apply_properties (script, oinfo);
return oinfo->object;
}
static gint
clutter_script_get_objects_valist (ClutterScript *script,
const gchar *first_name,
va_list args)
{
gint retval = 0;
const gchar *name;
name = first_name;
while (name)
{
GObject **obj = NULL;
obj = va_arg (args, GObject**);
*obj = clutter_script_get_object (script, name);
if (*obj)
retval += 1;
name = va_arg (args, gchar*);
}
return retval;
}
/**
* clutter_script_get_objects:
* @script: a #ClutterScript
* @first_name: the name of the first object to retrieve
* @...: return location for a #GObject, then additional names, ending
* with %NULL
*
* Retrieves a list of objects for the given names. After @script, object
* names/return location pairs should be listed, with a %NULL pointer
* ending the list, like:
*
* |[
* GObject *my_label, *a_button, *main_timeline;
*
* clutter_script_get_objects (script,
* "my-label", &my_label,
* "a-button", &a_button,
* "main-timeline", &main_timeline,
* NULL);
* ]|
*
* Note: This function does not increment the reference count of the
* returned objects.
*
* Return value: the number of objects returned.
*
* Since: 0.6
*/
gint
clutter_script_get_objects (ClutterScript *script,
const gchar *first_name,
...)
{
gint retval;
va_list var_args;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), 0);
g_return_val_if_fail (first_name != NULL, 0);
va_start (var_args, first_name);
retval = clutter_script_get_objects_valist (script, first_name, var_args);
va_end (var_args);
return retval;
}
typedef struct {
ClutterScript *script;
guint merge_id;
GSList *ids;
} UnmergeData;
static void
remove_by_merge_id (gpointer key,
gpointer value,
gpointer data)
{
gchar *name = key;
ObjectInfo *oinfo = value;
UnmergeData *unmerge_data = data;
if (oinfo->merge_id == unmerge_data->merge_id)
{
CLUTTER_NOTE (SCRIPT,
"Unmerging object (id:%s, type:%s, merge-id:%d)",
oinfo->id,
oinfo->class_name,
oinfo->merge_id);
unmerge_data->ids = g_slist_prepend (unmerge_data->ids, g_strdup (name));
oinfo->is_unmerged = TRUE;
}
}
/**
* clutter_script_unmerge_objects:
* @script: a #ClutterScript
* @merge_id: merge id returned when loading a UI definition
*
* Unmerges the objects identified by @merge_id.
*
* Since: 0.6
*/
void
clutter_script_unmerge_objects (ClutterScript *script,
guint merge_id)
{
ClutterScriptPrivate *priv;
UnmergeData data;
GSList *l;
g_return_if_fail (CLUTTER_IS_SCRIPT (script));
g_return_if_fail (merge_id > 0);
priv = script->priv;
data.script = script;
data.merge_id = merge_id;
data.ids = NULL;
g_hash_table_foreach (priv->objects, remove_by_merge_id, &data);
for (l = data.ids; l != NULL; l = l->next)
g_hash_table_remove (priv->objects, l->data);
g_slist_foreach (data.ids, (GFunc) g_free, NULL);
g_slist_free (data.ids);
clutter_script_ensure_objects (script);
}
static void
construct_each_objects (gpointer key,
gpointer value,
gpointer user_data)
{
ClutterScript *script = user_data;
ObjectInfo *oinfo = value;
/* we have unfinished business */
if (oinfo->has_unresolved)
{
/* this should not happen, but resilence is
* a good thing in a parser
*/
if (oinfo->object == NULL)
_clutter_script_construct_object (script, oinfo);
/* this will take care of setting up properties,
* adding children and applying behaviours
*/
_clutter_script_apply_properties (script, oinfo);
}
}
/**
* clutter_script_ensure_objects:
* @script: a #ClutterScript
*
* Ensure that every object defined inside @script is correctly
* constructed. You should rarely need to use this function.
*
* Since: 0.6
*/
void
clutter_script_ensure_objects (ClutterScript *script)
{
ClutterScriptPrivate *priv;
g_return_if_fail (CLUTTER_IS_SCRIPT (script));
priv = script->priv;
g_hash_table_foreach (priv->objects, construct_each_objects, script);
}
/**
* clutter_script_get_type_from_name:
* @script: a #ClutterScript
* @type_name: name of the type to look up
*
* Looks up a type by name, using the virtual function that
* #ClutterScript has for that purpose. This function should
* rarely be used.
*
* Return value: the type for the requested type name, or
* %G_TYPE_INVALID if not corresponding type was found.
*
* Since: 0.6
*/
GType
clutter_script_get_type_from_name (ClutterScript *script,
const gchar *type_name)
{
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), G_TYPE_INVALID);
g_return_val_if_fail (type_name != NULL, G_TYPE_INVALID);
return CLUTTER_SCRIPT_GET_CLASS (script)->get_type_from_name (script, type_name);
}
/**
* clutter_get_script_id:
* @gobject: a #GObject
*
* Retrieves the Clutter script id, if any.
*
* Return value: the script id, or %NULL if @object was not defined inside
* a UI definition file. The returned string is owned by the object and
* should never be modified or freed.
*
* Since: 0.6
*/
const gchar *
clutter_get_script_id (GObject *gobject)
{
g_return_val_if_fail (G_IS_OBJECT (gobject), NULL);
if (CLUTTER_IS_SCRIPTABLE (gobject))
return clutter_scriptable_get_id (CLUTTER_SCRIPTABLE (gobject));
else
return g_object_get_data (gobject, "clutter-script-id");
}
typedef struct {
GModule *module;
gpointer data;
} ConnectData;
/* default signal connection code */
static void
clutter_script_default_connect (ClutterScript *script,
GObject *gobject,
const gchar *signal_name,
const gchar *signal_handler,
GObject *connect_gobject,
GConnectFlags flags,
gpointer user_data)
{
ConnectData *data = user_data;
GCallback function;
if (!data->module)
return;
if (!g_module_symbol (data->module, signal_handler, (gpointer) &function))
{
g_warning ("Could not find a signal handler '%s' for signal '%s::%s'",
signal_handler,
connect_gobject ? G_OBJECT_TYPE_NAME (connect_gobject)
: G_OBJECT_TYPE_NAME (gobject),
signal_name);
return;
}
CLUTTER_NOTE (SCRIPT,
"connecting %s::%s to %s (afetr:%s, swapped:%s, object:%s)",
(connect_gobject ? G_OBJECT_TYPE_NAME (connect_gobject)
: G_OBJECT_TYPE_NAME (gobject)),
signal_name,
signal_handler,
(flags & G_CONNECT_AFTER) ? "true" : "false",
(flags & G_CONNECT_SWAPPED) ? "true" : "false",
(connect_gobject ? G_OBJECT_TYPE_NAME (connect_gobject)
: "<none>"));
if (connect_gobject != NULL)
g_signal_connect_object (gobject,
signal_name, function,
connect_gobject,
flags);
else
g_signal_connect_data (gobject,
signal_name, function,
data->data,
NULL,
flags);
}
/**
* clutter_script_connect_signals:
* @script: a #ClutterScript
* @user_data: data to be passed to the signal handlers, or %NULL
*
* Connects all the signals defined into a UI definition file to their
* handlers.
*
* This method invokes clutter_script_connect_signals_full() internally
* and uses #GModule's introspective features (by opening the current
* module's scope) to look at the application's symbol table.
*
* Note that this function will not work if #GModule is not supported by
* the platform Clutter is running on.
*
* Since: 0.6
*/
void
clutter_script_connect_signals (ClutterScript *script,
gpointer user_data)
{
ConnectData *cd;
g_return_if_fail (CLUTTER_IS_SCRIPT (script));
if (!g_module_supported ())
{
g_critical ("clutter_script_connect_signals() requires a working "
"GModule support from GLib");
return;
}
cd = g_new (ConnectData, 1);
cd->module = g_module_open (NULL, 0);
cd->data = user_data;
clutter_script_connect_signals_full (script,
clutter_script_default_connect,
cd);
g_module_close (cd->module);
g_free (cd);
}
typedef struct {
ClutterState *state;
GObject *emitter;
gchar *target;
gulong signal_id;
gulong hook_id;
gboolean warp_to;
} HookData;
typedef struct {
ClutterScript *script;
ClutterScriptConnectFunc func;
gpointer user_data;
} SignalConnectData;
static void
hook_data_free (gpointer data)
{
if (G_LIKELY (data != NULL))
{
HookData *hook_data = data;
g_free (hook_data->target);
g_slice_free (HookData, hook_data);
}
}
static gboolean
clutter_script_state_change_hook (GSignalInvocationHint *ihint,
guint n_params,
const GValue *params,
gpointer user_data)
{
HookData *hook_data = user_data;
GObject *emitter;
emitter = g_value_get_object (&params[0]);
if (emitter == hook_data->emitter)
{
if (hook_data->warp_to)
clutter_state_warp_to_state (hook_data->state, hook_data->target);
else
clutter_state_set_state (hook_data->state, hook_data->target);
}
return TRUE;
}
static void
clutter_script_remove_state_change_hook (gpointer user_data,
GObject *object_p)
{
HookData *hook_data = user_data;
g_signal_remove_emission_hook (hook_data->signal_id,
hook_data->hook_id);
}
static void
connect_each_object (gpointer key,
gpointer value,
gpointer data)
{
SignalConnectData *connect_data = data;
ClutterScript *script = connect_data->script;
ObjectInfo *oinfo = value;
GObject *object = oinfo->object;
GList *unresolved, *l;
_clutter_script_construct_object (script, oinfo);
unresolved = NULL;
for (l = oinfo->signals; l != NULL; l = l->next)
{
SignalInfo *sinfo = l->data;
if (sinfo->is_handler)
{
GObject *connect_object = NULL;
if (sinfo->object)
connect_object = clutter_script_get_object (script, sinfo->object);
if (sinfo->object && !connect_object)
unresolved = g_list_prepend (unresolved, sinfo);
else
{
connect_data->func (script, object,
sinfo->name,
sinfo->handler,
connect_object,
sinfo->flags,
connect_data->user_data);
}
}
else
{
GObject *state_object = NULL;
const gchar *signal_name, *signal_detail;
gchar **components;
GQuark signal_quark;
guint signal_id;
HookData *hook_data;
if (sinfo->state == NULL)
state_object = (GObject *) clutter_script_get_states (script, NULL);
else
{
state_object = clutter_script_get_object (script, sinfo->state);
if (state_object == NULL)
state_object = (GObject *) clutter_script_get_states (script, sinfo->state);
}
if (state_object == NULL)
continue;
components = g_strsplit (sinfo->name, "::", 2);
if (g_strv_length (components) == 2)
{
signal_name = components[0];
signal_detail = components[1];
}
else
{
signal_name = components[0];
signal_detail = NULL;
}
signal_id = g_signal_lookup (signal_name, G_OBJECT_TYPE (object));
if (signal_id == 0)
{
g_strfreev (components);
continue;
}
if (signal_detail != NULL)
signal_quark = g_quark_from_string (signal_detail);
else
signal_quark = 0;
hook_data = g_slice_new (HookData);
hook_data->emitter = object;
hook_data->state = CLUTTER_STATE (state_object);
hook_data->target = g_strdup (sinfo->target);
hook_data->warp_to = sinfo->warp_to;
hook_data->signal_id = signal_id;
hook_data->hook_id =
g_signal_add_emission_hook (signal_id, signal_quark,
clutter_script_state_change_hook,
hook_data,
hook_data_free);
g_object_weak_ref (hook_data->emitter,
clutter_script_remove_state_change_hook,
hook_data);
}
signal_info_free (sinfo);
}
/* keep the unresolved signal handlers around, in case
* clutter_script_connect_signals() is called multiple
* times (e.g. after a UI definition merge)
*/
g_list_free (oinfo->signals);
oinfo->signals = unresolved;
}
/**
* clutter_script_connect_signals_full:
* @script: a #ClutterScript
* @func: (scope call): signal connection function
* @user_data: data to be passed to the signal handlers, or %NULL
*
* Connects all the signals defined into a UI definition file to their
* handlers.
*
* This function allows to control how the signal handlers are
* going to be connected to their respective signals. It is meant
* primarily for language bindings to allow resolving the function
* names using the native API, but it can also be used on platforms
* that do not support GModule.
*
* Applications should use clutter_script_connect_signals().
*
* Since: 0.6
*/
void
clutter_script_connect_signals_full (ClutterScript *script,
ClutterScriptConnectFunc func,
gpointer user_data)
{
SignalConnectData data;
g_return_if_fail (CLUTTER_IS_SCRIPT (script));
g_return_if_fail (func != NULL);
data.script = script;
data.func = func;
data.user_data = user_data;
g_hash_table_foreach (script->priv->objects, connect_each_object, &data);
}
GQuark
clutter_script_error_quark (void)
{
return g_quark_from_static_string ("clutter-script-error");
}
/**
* clutter_script_add_search_paths:
* @script: a #ClutterScript
* @paths: (array length=n_paths): an array of strings containing
* different search paths
* @n_paths: the length of the passed array
*
* Adds @paths to the list of search paths held by @script.
*
* The search paths are used by clutter_script_lookup_filename(), which
* can be used to define search paths for the textures source file name
* or other custom, file-based properties.
*
* Since: 0.8
*/
void
clutter_script_add_search_paths (ClutterScript *script,
const gchar * const paths[],
gsize n_paths)
{
ClutterScriptPrivate *priv;
gchar **old_paths, **new_paths;
gsize old_paths_len, i;
gsize iter = 0;
g_return_if_fail (CLUTTER_IS_SCRIPT (script));
g_return_if_fail (paths != NULL);
g_return_if_fail (n_paths > 0);
priv = script->priv;
if (priv->search_paths)
{
old_paths = priv->search_paths;
old_paths_len = g_strv_length (old_paths);
}
else
{
old_paths = NULL;
old_paths_len = 0;
}
new_paths = g_new0 (gchar*, old_paths_len + n_paths + 1);
for (i = 0, iter = 0; i < old_paths_len; i++, iter++)
new_paths[iter] = g_strdup (old_paths[i]);
for (i = 0; i < n_paths; i++, iter++)
new_paths[iter] = g_strdup (paths[i]);
CLUTTER_NOTE (SCRIPT,
"Added %" G_GSIZE_FORMAT " new search paths (new size: %d)",
n_paths,
g_strv_length (new_paths));
priv->search_paths = new_paths;
if (old_paths)
g_strfreev (old_paths);
}
/**
* clutter_script_lookup_filename:
* @script: a #ClutterScript
* @filename: the name of the file to lookup
*
* Looks up @filename inside the search paths of @script. If @filename
* is found, its full path will be returned .
*
* Return value: the full path of @filename or %NULL if no path was
* found.
*
* Since: 0.8
*/
gchar *
clutter_script_lookup_filename (ClutterScript *script,
const gchar *filename)
{
ClutterScriptPrivate *priv;
gchar *dirname;
gchar *retval;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), NULL);
g_return_val_if_fail (filename != NULL, NULL);
if (g_path_is_absolute (filename))
return g_strdup (filename);
priv = script->priv;
if (priv->search_paths)
{
gsize paths_len, i;
paths_len = g_strv_length (priv->search_paths);
for (i = 0; i < paths_len; i++)
{
retval = g_build_filename (priv->search_paths[i], filename, NULL);
if (g_file_test (retval, G_FILE_TEST_EXISTS))
return retval;
else
{
g_free (retval);
retval = NULL;
}
}
}
/* Fall back to assuming relative to our script */
if (priv->is_filename)
dirname = g_path_get_dirname (script->priv->filename);
else
dirname = g_get_current_dir ();
retval = g_build_filename (dirname, filename, NULL);
if (!g_file_test (retval, G_FILE_TEST_EXISTS))
{
g_free (retval);
retval = NULL;
}
g_free (dirname);
return retval;
}
/**
* clutter_script_list_objects:
* @script: a #ClutterScript
*
* Retrieves all the objects created by @script.
*
* Note: this function does not increment the reference count of the
* objects it returns.
*
* Return value: (transfer container) (element-type GObject.Object): a list
* of #GObject<!-- -->s, or %NULL. The objects are owned by the
* #ClutterScript instance. Use g_list_free() on the returned list when
* done.
*
* Since: 0.8
*/
GList *
clutter_script_list_objects (ClutterScript *script)
{
GList *objects, *l;
GList *retval;
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), NULL);
clutter_script_ensure_objects (script);
if (!script->priv->objects)
return NULL;
retval = NULL;
objects = g_hash_table_get_values (script->priv->objects);
for (l = objects; l != NULL; l = l->next)
{
ObjectInfo *oinfo = l->data;
if (oinfo->object)
retval = g_list_prepend (retval, oinfo->object);
}
g_list_free (objects);
return retval;
}
/**
* clutter_script_add_states:
* @script: a #ClutterScript
* @name: (allow-none): a name for the @state, or %NULL to
* set the default #ClutterState
* @state: a #ClutterState
*
* Associates a #ClutterState to the #ClutterScript instance using the given
* name.
*
* The #ClutterScript instance will use @state to resolve target states when
* connecting signal handlers.
*
* The #ClutterScript instance will take a reference on the #ClutterState
* passed to this function.
*
* Since: 1.8
*
* Deprecated: 1.12
*/
void
clutter_script_add_states (ClutterScript *script,
const gchar *name,
ClutterState *state)
{
g_return_if_fail (CLUTTER_IS_SCRIPT (script));
g_return_if_fail (CLUTTER_IS_STATE (state));
if (name == NULL || *name == '\0')
name = "__clutter_script_default_state";
g_hash_table_replace (script->priv->states,
g_strdup (name),
g_object_ref (state));
}
/**
* clutter_script_get_states:
* @script: a #ClutterScript
* @name: (allow-none): the name of the #ClutterState, or %NULL
*
* Retrieves the #ClutterState for the given @state_name.
*
* If @name is %NULL, this function will return the default
* #ClutterState instance.
*
* Return value: (transfer none): a pointer to the #ClutterState for the
* given name. The #ClutterState is owned by the #ClutterScript instance
* and it should not be unreferenced
*
* Since: 1.8
*
* Deprecated: 1.12
*/
ClutterState *
clutter_script_get_states (ClutterScript *script,
const gchar *name)
{
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), NULL);
if (name == NULL || *name == '\0')
name = "__clutter_script_default_state";
return g_hash_table_lookup (script->priv->states, name);
}
/**
* clutter_script_set_translation_domain:
* @script: a #ClutterScript
* @domain: (allow-none): the translation domain, or %NULL
*
* Sets the translation domain for @script.
*
* Since: 1.10
*/
void
clutter_script_set_translation_domain (ClutterScript *script,
const gchar *domain)
{
g_return_if_fail (CLUTTER_IS_SCRIPT (script));
if (g_strcmp0 (domain, script->priv->translation_domain) == 0)
return;
g_free (script->priv->translation_domain);
script->priv->translation_domain = g_strdup (domain);
g_object_notify_by_pspec (G_OBJECT (script), obj_props[PROP_TRANSLATION_DOMAIN]);
}
/**
* clutter_script_get_translation_domain:
* @script: a #ClutterScript
*
* Retrieves the translation domain set using
* clutter_script_set_translation_domain().
*
* Return value: (transfer none): the translation domain, if any is set,
* or %NULL
*
* Since: 1.10
*/
const gchar *
clutter_script_get_translation_domain (ClutterScript *script)
{
g_return_val_if_fail (CLUTTER_IS_SCRIPT (script), NULL);
return script->priv->translation_domain;
}
/*
* _clutter_script_generate_fake_id:
* @script: a #ClutterScript
*
* Generates a fake id string for object definitions without
* an "id" member
*
* Return value: a newly-allocated string containing the fake
* id. Use g_free() to free the resources allocated by the
* returned value
*
*/
gchar *
_clutter_script_generate_fake_id (ClutterScript *script)
{
ClutterScriptPrivate *priv = script->priv;
return g_strdup_printf ("script-%d-%d",
priv->last_merge_id,
priv->last_unknown++);
}
/*
* _clutter_script_warn_missing_attribute:
* @script: a #ClutterScript
* @id_: the id of an object definition, or %NULL
* @attribute: the expected attribute
*
* Emits a warning, using GLib's log facilities, for a missing
* @attribute in an object definition, pointing to the current
* location of the #ClutterScriptParser
*/
void
_clutter_script_warn_missing_attribute (ClutterScript *script,
const gchar *id_,
const gchar *attribute)
{
ClutterScriptPrivate *priv = script->priv;
JsonParser *parser = JSON_PARSER (priv->parser);
gint current_line = json_parser_get_current_line (parser);
if (id_ != NULL && *id_ != '\0')
{
g_warning ("%s:%d: object '%s' has no '%s' attribute",
priv->is_filename ? priv->filename : "<input>",
current_line,
id_,
attribute);
}
else
{
g_warning ("%s:%d: object has no '%s' attribute",
priv->is_filename ? priv->filename : "<input>",
current_line,
attribute);
}
}
/*
* _clutter_script_warn_invalid_value:
* @script: a #ClutterScript
* @attribute: the attribute with the invalid value
* @expected: a string with the expected value
* @node: a #JsonNode containing the value
*
* Emits a warning, using GLib's log facilities, for an invalid
* value found when parsing @attribute, pointing to the current
* location of the #ClutterScriptParser
*/
void
_clutter_script_warn_invalid_value (ClutterScript *script,
const gchar *attribute,
const gchar *expected,
JsonNode *node)
{
ClutterScriptPrivate *priv = script->priv;
JsonParser *parser = JSON_PARSER (priv->parser);
gint current_line = json_parser_get_current_line (parser);
if (node != NULL)
{
g_warning ("%s:%d: invalid value of type '%s' for attribute '%s':"
"a value of type '%s' is expected",
priv->is_filename ? priv->filename : "<input>",
current_line,
json_node_type_name (node),
attribute,
expected);
}
else
{
g_warning ("%s:%d: invalid value for attribute '%s':"
"a value of type '%s' is expected",
priv->is_filename ? priv->filename : "<input>",
current_line,
attribute,
expected);
}
}
/*
* _clutter_script_get_object_info:
* @script: a #ClutterScript
* @script_id: the id of the object definition
*
* Retrieves the #ObjectInfo for the given @script_id
*
* Return value: a #ObjectInfo or %NULL
*/
ObjectInfo *
_clutter_script_get_object_info (ClutterScript *script,
const gchar *script_id)
{
ClutterScriptPrivate *priv = script->priv;
return g_hash_table_lookup (priv->objects, script_id);
}
/*
* _clutter_script_get_last_merge_id:
* @script: a #ClutterScript
*
* Retrieves the last merge id of @script. The merge id
* should be stored inside an #ObjectInfo. If you need
* a unique fake id for object definitions with an "id"
* member, consider using _clutter_script_generate_fake_id()
* instead
*
* Return value: the last merge id
*/
guint
_clutter_script_get_last_merge_id (ClutterScript *script)
{
return script->priv->last_merge_id;
}
/*
* _clutter_script_add_object_info:
* @script: a #ClutterScript
* @oinfo: a #ObjectInfo
*
* Adds @oinfo inside the objects list held by @script
*/
void
_clutter_script_add_object_info (ClutterScript *script,
ObjectInfo *oinfo)
{
ClutterScriptPrivate *priv = script->priv;
g_hash_table_steal (priv->objects, oinfo->id);
g_hash_table_insert (priv->objects, oinfo->id, oinfo);
}
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