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mutter/clutter/cally/cally-util.c
Emmanuele Bassi 2b81d90dd7 Eliminate G_CONST_RETURN 
The G_CONST_RETURN define in GLib is, and has always been, a bit fuzzy.

We always used it to conform to the platform, at least for public-facing
API.

At first I assumed it has something to do with brain-damaged compilers
or with weird platforms where const was not really supported; sadly,
it's something much, much worse: it's a define that can be toggled at
compile-time to remove const from the signature of public API. This is a
truly terrifying feature that I assume was added in the past century,
and whose inception clearly had something to do with massive doses of
absynthe and opium — because any other explanation would make the
existence of such a feature even worse than assuming drugs had anything
to do with it.

Anyway, and pleasing the gods, this dubious feature is being
removed/deprecated in GLib; see bug:

  https://bugzilla.gnome.org/show_bug.cgi?id=644611

Before deprecation, though, we should just remove its usage from the
whole API. We should especially remove its usage from Cally's internals,
since there it never made sense in the first place.
2011-06-07 16:06:24 +01:00

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/* CALLY - The Clutter Accessibility Implementation Library
*
* Copyright (C) 2008 Igalia, S.L.
*
* Author: Alejandro Piñeiro Iglesias <apinheiro@igalia.com>
*
* Based on GailUtil from GAIL
* Copyright 2001, 2002, 2003 Sun Microsystems Inc.
*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:cally-util
* @Title: CallyUtil
* @short_description: #AtkUtil implementation
* @see_also: #ClutterActor
*
* #CallyUtil implements #AtkUtil abstract methods. Although it
* includes the name "Util" it is in fact one of the most important
* interfaces to be implemented in any ATK toolkit implementation.
* For instance, it defines atk_get_root(), the method that returns
* the root object in the hierarchy. Without it, you don't have
* available any accessible object.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <clutter/clutter.h>
#include "cally-util.h"
#include "cally-root.h"
#include "cally-stage.h"
static void cally_util_class_init (CallyUtilClass *klass);
static void cally_util_init (CallyUtil *cally_util);
/* atkutil.h */
static guint cally_util_add_global_event_listener (GSignalEmissionHook listener,
const gchar* event_type);
static void cally_util_remove_global_event_listener (guint remove_listener);
static guint cally_util_add_key_event_listener (AtkKeySnoopFunc listener,
gpointer data);
static void cally_util_remove_key_event_listener (guint remove_listener);
static AtkObject* cally_util_get_root (void);
static const gchar * cally_util_get_toolkit_name (void);
static const gchar * cally_util_get_toolkit_version (void);
/* private */
static void _listener_info_destroy (gpointer data);
static guint add_listener (GSignalEmissionHook listener,
const gchar *object_type,
const gchar *signal,
const gchar *hook_data);
static void cally_util_simulate_snooper_install (void);
static void cally_util_simulate_snooper_remove (void);
static gboolean cally_key_snooper (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data);
static void cally_util_stage_added_cb (ClutterStageManager *stage_manager,
ClutterStage *stage,
gpointer data);
static void cally_util_stage_removed_cb (ClutterStageManager *stage_manager,
ClutterStage *stage,
gpointer data);
static gboolean notify_hf (gpointer key,
gpointer value,
gpointer data);
static void insert_hf (gpointer key,
gpointer value,
gpointer data);
static AtkKeyEventStruct * atk_key_event_from_clutter_event_key (ClutterKeyEvent *event);
static void do_window_event_initialization (void);
/* This is just a copy of the Gail one, a shared library or place to
define it could be a good idea. */
typedef struct _CallyUtilListenerInfo CallyUtilListenerInfo;
typedef struct _CallyKeyEventInfo CallyKeyEventInfo;
struct _CallyUtilListenerInfo
{
gint key;
guint signal_id;
gulong hook_id;
};
struct _CallyKeyEventInfo
{
AtkKeySnoopFunc listener;
gpointer func_data;
};
static AtkObject* root = NULL;
static GHashTable *listener_list = NULL;
static GHashTable *key_listener_list = NULL;
static gint listener_idx = 1;
G_DEFINE_TYPE (CallyUtil, cally_util, ATK_TYPE_UTIL);
static void
cally_util_class_init (CallyUtilClass *klass)
{
AtkUtilClass *atk_class;
gpointer data;
data = g_type_class_peek (ATK_TYPE_UTIL);
atk_class = ATK_UTIL_CLASS (data);
atk_class->add_global_event_listener = cally_util_add_global_event_listener;
atk_class->remove_global_event_listener = cally_util_remove_global_event_listener;
atk_class->add_key_event_listener = cally_util_add_key_event_listener;
atk_class->remove_key_event_listener = cally_util_remove_key_event_listener;
atk_class->get_root = cally_util_get_root;
atk_class->get_toolkit_name = cally_util_get_toolkit_name;
atk_class->get_toolkit_version = cally_util_get_toolkit_version;
/* FIXME: Instead of create this on the class, I think that would
worth to implement CallyUtil as a singleton instance, so the
class methods will access this instance. This will be a good
future enhancement, meanwhile, just using the same *working*
implementation used on GailUtil */
listener_list = g_hash_table_new_full (g_int_hash, g_int_equal, NULL,
_listener_info_destroy);
}
static void
cally_util_init (CallyUtil *cally_util)
{
/* instance init: usually not required */
}
/* ------------------------------ ATK UTIL METHODS -------------------------- */
static AtkObject*
cally_util_get_root (void)
{
if (!root)
root = cally_root_new ();
return root;
}
static const gchar *
cally_util_get_toolkit_name (void)
{
return "CALLY";
}
static const gchar *
cally_util_get_toolkit_version (void)
{
/*
* FIXME:
* Version is passed in as a -D flag when this file is
* compiled.
*/
return "0.1";
}
static guint
cally_util_add_global_event_listener (GSignalEmissionHook listener,
const gchar *event_type)
{
guint rc = 0;
gchar **split_string;
split_string = g_strsplit (event_type, ":", 3);
if (split_string)
{
if (!strcmp ("window", split_string[0]))
{
/* Using ClutterStage as the window equivalent, although
several methods (move, etc) are missing. This would be
probably defined for other window-related classes (MxWindow)
FIXME: for this reason, this process should be extendable
on the future.*/
static gboolean initialized = FALSE;
if (initialized == FALSE)
{
do_window_event_initialization ();
initialized = TRUE;
}
rc = add_listener (listener, "CallyStage", split_string[1], event_type);
}
else
{
rc = add_listener (listener, split_string[1], split_string[2], event_type);
}
g_strfreev (split_string);
}
return rc;
}
static void
cally_util_remove_global_event_listener (guint remove_listener)
{
if (remove_listener > 0)
{
CallyUtilListenerInfo *listener_info;
gint tmp_idx = remove_listener;
listener_info = (CallyUtilListenerInfo *)
g_hash_table_lookup(listener_list, &tmp_idx);
if (listener_info != NULL)
{
/* Hook id of 0 and signal id of 0 are invalid */
if (listener_info->hook_id != 0 && listener_info->signal_id != 0)
{
/* Remove the emission hook */
g_signal_remove_emission_hook(listener_info->signal_id,
listener_info->hook_id);
/* Remove the element from the hash */
g_hash_table_remove(listener_list, &tmp_idx);
}
else
{
g_warning("Invalid listener hook_id %ld or signal_id %d\n",
listener_info->hook_id, listener_info->signal_id);
}
}
else
{
g_warning("No listener with the specified listener id %d",
remove_listener);
}
}
else
{
g_warning("Invalid listener_id %d", remove_listener);
}
}
static guint
cally_util_add_key_event_listener (AtkKeySnoopFunc listener,
gpointer data)
{
static guint key=0;
CallyKeyEventInfo *event_info = NULL;
if (!key_listener_list)
{
key_listener_list = g_hash_table_new_full (NULL, NULL, NULL, g_free);
cally_util_simulate_snooper_install ();
}
event_info = g_new (CallyKeyEventInfo, 1);
event_info->listener = listener;
event_info->func_data = data;
g_hash_table_insert (key_listener_list, GUINT_TO_POINTER (key++), event_info);
/* XXX: we don't check to see if n_listeners > MAXUINT */
return key - 1;
}
static void
cally_util_remove_key_event_listener (guint remove_listener)
{
if (!g_hash_table_remove (key_listener_list, GUINT_TO_POINTER (remove_listener))) {
g_warning ("Not able to remove listener with id %i", remove_listener);
}
if (g_hash_table_size (key_listener_list) == 0)
{
cally_util_simulate_snooper_remove ();
}
}
/* ------------------------------ PRIVATE FUNCTIONS ------------------------- */
static void
_listener_info_destroy (gpointer data)
{
g_free(data);
}
static guint
add_listener (GSignalEmissionHook listener,
const gchar *object_type,
const gchar *signal_name,
const gchar *hook_data)
{
GType type;
guint signal_id;
gint rc = 0;
type = g_type_from_name (object_type);
if (type)
{
signal_id = g_signal_lookup (signal_name, type);
if (signal_id > 0)
{
CallyUtilListenerInfo *listener_info;
rc = listener_idx;
listener_info = g_new (CallyUtilListenerInfo, 1);
listener_info->key = listener_idx;
listener_info->hook_id =
g_signal_add_emission_hook (signal_id, 0, listener,
g_strdup (hook_data),
(GDestroyNotify) g_free);
listener_info->signal_id = signal_id;
g_hash_table_insert(listener_list, &(listener_info->key), listener_info);
listener_idx++;
}
else
{
/* This is mainly because some "window:xxx" methods not
implemented on CallyStage */
g_debug ("Signal type %s not supported\n", signal_name);
}
}
else
{
g_warning("Invalid object type %s\n", object_type);
}
return rc;
}
/* Trying to emulate gtk_key_snooper install (a kind of wrapper). This
could be implemented without it, but I will maintain it in this
way, so if in the future clutter implements it natively it would be
easier the transition */
static void
cally_util_simulate_snooper_install (void)
{
ClutterStageManager *stage_manager = NULL;
ClutterStage *stage = NULL;
GSList *stage_list = NULL;
GSList *iter = NULL;
stage_manager = clutter_stage_manager_get_default ();
stage_list = clutter_stage_manager_list_stages (stage_manager);
for (iter = stage_list; iter != NULL; iter = g_slist_next (iter))
{
stage = CLUTTER_STAGE (iter->data);
g_signal_connect (G_OBJECT (stage), "captured-event",
G_CALLBACK (cally_key_snooper), NULL);
}
g_signal_connect (G_OBJECT (stage_manager), "stage-added",
G_CALLBACK (cally_util_stage_added_cb), cally_key_snooper);
g_signal_connect (G_OBJECT (stage_manager), "stage-removed",
G_CALLBACK (cally_util_stage_removed_cb), cally_key_snooper);
}
static void
cally_util_simulate_snooper_remove (void)
{
ClutterStageManager *stage_manager = NULL;
ClutterStage *stage = NULL;
GSList *stage_list = NULL;
GSList *iter = NULL;
gint num = 0;
stage_manager = clutter_stage_manager_get_default ();
stage_list = clutter_stage_manager_list_stages (stage_manager);
for (iter = stage_list; iter != NULL; iter = g_slist_next (iter))
{
stage = CLUTTER_STAGE (iter->data);
num += g_signal_handlers_disconnect_by_func (stage, cally_key_snooper, NULL);
}
g_signal_handlers_disconnect_by_func (G_OBJECT (stage_manager),
G_CALLBACK (cally_util_stage_added_cb),
cally_key_snooper);
g_signal_handlers_disconnect_by_func (G_OBJECT (stage_manager),
G_CALLBACK (cally_util_stage_removed_cb),
cally_key_snooper);
#ifdef CALLY_DEBUG
g_print ("Number of snooper callbacks disconnected: %i\n", num);
#endif
}
static AtkKeyEventStruct *
atk_key_event_from_clutter_event_key (ClutterKeyEvent *clutter_event)
{
AtkKeyEventStruct *atk_event = g_new0 (AtkKeyEventStruct, 1);
gunichar key_unichar;
switch (clutter_event->type)
{
case CLUTTER_KEY_PRESS:
atk_event->type = ATK_KEY_EVENT_PRESS;
break;
case CLUTTER_KEY_RELEASE:
atk_event->type = ATK_KEY_EVENT_RELEASE;
break;
default:
g_assert_not_reached ();
return NULL;
}
atk_event->state = clutter_event->modifier_state;
/* We emit the clutter keyval. This is not exactly the one expected
by AtkKeyEventStruct, as it expects a Gdk-like event, with the
modifiers applied. But to avoid a dependency to gdk, we delegate
that on the AT application.
More information: Bug 1952 and bug 2072
*/
atk_event->keyval = clutter_event->keyval;
/* It is expected to store a key defining string here (ie "Space" in
case you press a space). Anyway, there are no function on clutter
to obtain that, and we want to avoid a gdk dependency here, so we
delegate on the AT application to obtain that string using the
rest of the data on the ATK event struct.
More information: Bug 1952 and 2072
*/
key_unichar = clutter_event_get_key_unicode ((ClutterEvent *) clutter_event);
if (g_unichar_validate (key_unichar) && !g_unichar_iscntrl (key_unichar))
{
GString *new = NULL;
new = g_string_new ("");
new = g_string_insert_unichar (new, 0, key_unichar);
atk_event->string = new->str;
g_string_free (new, FALSE);
}
else
atk_event->string = NULL;
atk_event->length = 0;
atk_event->keycode = clutter_event->hardware_keycode;
atk_event->timestamp = clutter_event->time;
#ifdef CALLY_DEBUG
g_debug ("CallyKeyEvent:\tsym 0x%x\n\t\tmods %x\n\t\tcode %u\n\t\ttime %lx \n\t\tstring %s\n",
(unsigned int) atk_event->keyval,
(unsigned int) atk_event->state,
(unsigned int) atk_event->keycode,
(unsigned long int) atk_event->timestamp,
atk_event->string);
#endif
return atk_event;
}
static gboolean
notify_hf (gpointer key, gpointer value, gpointer data)
{
CallyKeyEventInfo *info = (CallyKeyEventInfo *) value;
AtkKeyEventStruct *key_event = (AtkKeyEventStruct *)data;
return (*(AtkKeySnoopFunc) info->listener) (key_event, info->func_data) ? TRUE : FALSE;
}
static void
insert_hf (gpointer key, gpointer value, gpointer data)
{
GHashTable *new_table = (GHashTable *) data;
g_hash_table_insert (new_table, key, value);
}
static gboolean
cally_key_snooper (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
AtkKeyEventStruct *key_event = NULL;
gint consumed = 0;
/* filter key events */
if ((event->type != CLUTTER_KEY_PRESS) && (event->type != CLUTTER_KEY_RELEASE))
{
return FALSE;
}
if (key_listener_list)
{
GHashTable *new_hash = g_hash_table_new (NULL, NULL);
g_hash_table_foreach (key_listener_list, insert_hf, new_hash);
key_event = atk_key_event_from_clutter_event_key ((ClutterKeyEvent *)event);
/* func data is inside the hash table */
consumed = g_hash_table_foreach_steal (new_hash, notify_hf, key_event);
g_hash_table_destroy (new_hash);
}
g_free (key_event->string);
g_free (key_event);
return (consumed ? 1 : 0);
}
static void
cally_util_stage_added_cb (ClutterStageManager *stage_manager,
ClutterStage *stage,
gpointer data)
{
GCallback cally_key_snooper_cb = G_CALLBACK (data);
g_signal_connect (G_OBJECT (stage), "captured-event", cally_key_snooper_cb, NULL);
}
static void
cally_util_stage_removed_cb (ClutterStageManager *stage_manager,
ClutterStage *stage,
gpointer data)
{
GCallback cally_key_snooper_cb = G_CALLBACK (data);
g_signal_handlers_disconnect_by_func (stage, cally_key_snooper_cb, NULL);
}
static void
do_window_event_initialization (void)
{
/*
* Ensure that CallyStageClass exists.
*/
g_type_class_unref (g_type_class_ref (CALLY_TYPE_STAGE));
}
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