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One of the uses of a ClutterState state machine along with ClutterScript
is to provide a quick way to transition from state to state in response
to signal emitted on specific instances.
Connecting a real function, in code, to a specific signal does not
improve the ease of use of ClutterScript to define scenes.
By adding a new signal definition to the current one we can have both a
simple way to define application logic in code and in the UI definition
file.
The new syntax is trivial:
{
"name" : <signal name>,
"state" : <state machine script id>,
"target-state" : <target state>
}
The ClutterState instance is identified by its script id, and the target
state is resolved at run-time, so it can be defined both in
ClutterScript or in code. Ideally, we should find a way to associate a
default ClutterState instance to the ClutterScript one that parses the
definition; this way we would be able to remove the "state" member, or
even "style" the behaviour of an object by replacing the ClutterState
instance.
The implementation uses a signal emission hook, to avoid knowing the
signal signature; we check the emitter of the signal against the object
that defined the signal, to avoid erroneous state changes.
162 lines
5.2 KiB
C
162 lines
5.2 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2006 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __CLUTTER_SCRIPT_PRIVATE_H__
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#define __CLUTTER_SCRIPT_PRIVATE_H__
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#include <glib-object.h>
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#include <json-glib/json-glib.h>
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#include "clutter-color.h"
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#include "clutter-types.h"
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#include "clutter-script.h"
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_SCRIPT_PARSER (clutter_script_parser_get_type ())
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#define CLUTTER_SCRIPT_PARSER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_SCRIPT_PARSER, ClutterScriptParser))
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#define CLUTTER_IS_SCRIPT_PARSER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_SCRIPT_PARSER))
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typedef struct _ClutterScriptParser ClutterScriptParser;
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typedef struct _JsonParserClass ClutterScriptParserClass;
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struct _ClutterScriptParser
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{
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JsonParser parent_instance;
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/* back reference */
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ClutterScript *script;
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};
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typedef GType (* GTypeGetFunc) (void);
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typedef struct {
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gchar *id;
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gchar *class_name;
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gchar *type_func;
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GList *properties;
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GList *children;
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GList *signals;
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GType gtype;
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GObject *object;
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guint merge_id;
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guint is_actor : 1;
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guint is_stage : 1;
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guint is_stage_default : 1;
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guint has_unresolved : 1;
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guint is_unmerged : 1;
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} ObjectInfo;
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void object_info_free (gpointer data);
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typedef struct {
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gchar *name;
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JsonNode *node;
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GParamSpec *pspec;
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guint is_child : 1;
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guint is_layout : 1;
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} PropertyInfo;
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typedef struct {
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gchar *name;
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gchar *handler;
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gchar *object;
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gchar *state;
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gchar *target;
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GConnectFlags flags;
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guint is_handler : 1;
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} SignalInfo;
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void property_info_free (gpointer data);
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GType clutter_script_parser_get_type (void) G_GNUC_CONST;
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gboolean clutter_script_parse_node (ClutterScript *script,
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GValue *value,
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const gchar *name,
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JsonNode *node,
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GParamSpec *pspec);
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GType clutter_script_get_type_from_symbol (const gchar *symbol);
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GType clutter_script_get_type_from_class (const gchar *name);
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gulong clutter_script_resolve_animation_mode (JsonNode *node);
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gboolean clutter_script_enum_from_string (GType gtype,
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const gchar *string,
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gint *enum_value);
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gboolean clutter_script_flags_from_string (GType gtype,
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const gchar *string,
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gint *flags_value);
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gboolean clutter_script_parse_knot (ClutterScript *script,
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JsonNode *node,
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ClutterKnot *knot);
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gboolean clutter_script_parse_geometry (ClutterScript *script,
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JsonNode *node,
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ClutterGeometry *geometry);
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gboolean clutter_script_parse_color (ClutterScript *script,
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JsonNode *node,
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ClutterColor *color);
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GObject *_clutter_script_parse_alpha (ClutterScript *script,
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JsonNode *node);
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void _clutter_script_construct_object (ClutterScript *script,
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ObjectInfo *oinfo);
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void _clutter_script_apply_properties (ClutterScript *script,
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ObjectInfo *oinfo);
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gchar *_clutter_script_generate_fake_id (ClutterScript *script);
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void _clutter_script_warn_missing_attribute (ClutterScript *script,
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const gchar *id,
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const gchar *attribute);
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void _clutter_script_warn_invalid_value (ClutterScript *script,
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const gchar *attribute,
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const gchar *expected,
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JsonNode *node);
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ObjectInfo *_clutter_script_get_object_info (ClutterScript *script,
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const gchar *script_id);
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guint _clutter_script_get_last_merge_id (ClutterScript *script);
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void _clutter_script_add_object_info (ClutterScript *script,
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ObjectInfo *oinfo);
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const gchar *_clutter_script_get_id_from_node (JsonNode *node);
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G_END_DECLS
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#endif /* __CLUTTER_SCRIPT_PRIVATE_H__ */
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