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mutter/clutter/cally/cally-util.c
Matthias Clasen 5781beb22d cally: Fix up event listener registration minimally 
For god-knows-what reason, at-spi is trying various formats
of strings when registering listeners, triggering an ugly

(gnome-shell:4411): Clutter-WARNING **: invalid object type create

warning in .xsession-errors. Stop doing that.

Also don't leak temporary string arrays that are a side-effect
of passing parameters around as formatted strings.

https://bugzilla.gnome.org/show_bug.cgi?id=658721
2011-09-11 10:57:25 -04:00

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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);
/* 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 "clutter";
}
static const gchar *
cally_util_get_toolkit_version (void)
{
return CLUTTER_VERSION_S;
}
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 (g_strv_length (split_string) == 3)
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);
}
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