gecko-dev/accessible/atk/UtilInterface.cpp

347 строки
11 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ApplicationAccessibleWrap.h"
#include "mozilla/Likely.h"
#include "nsAccessibilityService.h"
#include "nsMai.h"
#include <atk/atk.h>
#include <gtk/gtk.h>
#include <string.h>
using namespace mozilla;
using namespace mozilla::a11y;
typedef AtkUtil MaiUtil;
typedef AtkUtilClass MaiUtilClass;
#define MAI_VERSION MOZILLA_VERSION
#define MAI_NAME "Gecko"
extern "C" {
static guint (*gail_add_global_event_listener)(GSignalEmissionHook listener,
const gchar* event_type);
static void (*gail_remove_global_event_listener)(guint remove_listener);
static void (*gail_remove_key_event_listener)(guint remove_listener);
static AtkObject* (*gail_get_root)();
}
struct MaiUtilListenerInfo {
gint key;
guint signal_id;
gulong hook_id;
// For window create/destory/minimize/maximize/restore/activate/deactivate
// events, we'll chain gail_util's add/remove_global_event_listener.
// So we store the listenerid returned by gail's add_global_event_listener
// in this structure to call gail's remove_global_event_listener later.
guint gail_listenerid;
};
static GHashTable* sListener_list = nullptr;
static gint sListener_idx = 1;
extern "C" {
static guint add_listener(GSignalEmissionHook listener,
const gchar* object_type, const gchar* signal,
const gchar* hook_data, guint gail_listenerid = 0) {
GType type;
guint signal_id;
gint rc = 0;
type = g_type_from_name(object_type);
if (type) {
signal_id = g_signal_lookup(signal, type);
if (signal_id > 0) {
MaiUtilListenerInfo* listener_info;
rc = sListener_idx;
listener_info =
(MaiUtilListenerInfo*)g_malloc(sizeof(MaiUtilListenerInfo));
listener_info->key = sListener_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;
listener_info->gail_listenerid = gail_listenerid;
g_hash_table_insert(sListener_list, &(listener_info->key), listener_info);
sListener_idx++;
} else {
g_warning("Invalid signal type %s\n", signal);
}
} else {
g_warning("Invalid object type %s\n", object_type);
}
return rc;
}
static guint mai_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])) {
guint gail_listenerid = 0;
if (gail_add_global_event_listener) {
// call gail's function to track gtk native window events
gail_listenerid = gail_add_global_event_listener(listener, event_type);
}
rc = add_listener(listener, "MaiAtkObject", split_string[1], event_type,
gail_listenerid);
} else {
rc = add_listener(listener, split_string[1], split_string[2], event_type);
}
g_strfreev(split_string);
}
return rc;
}
static void mai_util_remove_global_event_listener(guint remove_listener) {
if (remove_listener > 0) {
MaiUtilListenerInfo* listener_info;
gint tmp_idx = remove_listener;
listener_info =
(MaiUtilListenerInfo*)g_hash_table_lookup(sListener_list, &tmp_idx);
if (listener_info != nullptr) {
if (gail_remove_global_event_listener && listener_info->gail_listenerid) {
gail_remove_global_event_listener(listener_info->gail_listenerid);
}
/* 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(sListener_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 {
// atk-bridge is initialized with gail (e.g. yelp)
// try gail_remove_global_event_listener
if (gail_remove_global_event_listener) {
return gail_remove_global_event_listener(remove_listener);
}
g_warning("No listener with the specified listener id %d",
remove_listener);
}
} else {
g_warning("Invalid listener_id %d", remove_listener);
}
}
static AtkKeyEventStruct* atk_key_event_from_gdk_event_key(GdkEventKey* key) {
AtkKeyEventStruct* event = g_new0(AtkKeyEventStruct, 1);
switch (key->type) {
case GDK_KEY_PRESS:
event->type = ATK_KEY_EVENT_PRESS;
break;
case GDK_KEY_RELEASE:
event->type = ATK_KEY_EVENT_RELEASE;
break;
default:
g_assert_not_reached();
return nullptr;
}
event->state = key->state;
event->keyval = key->keyval;
event->length = key->length;
if (key->string && key->string[0] &&
g_unichar_isgraph(g_utf8_get_char(key->string))) {
event->string = key->string;
} else if (key->type == GDK_KEY_PRESS || key->type == GDK_KEY_RELEASE) {
event->string = gdk_keyval_name(key->keyval);
}
event->keycode = key->hardware_keycode;
event->timestamp = key->time;
return event;
}
struct MaiKeyEventInfo {
AtkKeyEventStruct* key_event;
gpointer func_data;
};
union AtkKeySnoopFuncPointer {
AtkKeySnoopFunc func_ptr;
gpointer data;
};
static gboolean notify_hf(gpointer key, gpointer value, gpointer data) {
MaiKeyEventInfo* info = (MaiKeyEventInfo*)data;
AtkKeySnoopFuncPointer atkKeySnoop;
atkKeySnoop.data = value;
return (atkKeySnoop.func_ptr)(info->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 GHashTable* sKey_listener_list = nullptr;
static gint mai_key_snooper(GtkWidget* the_widget, GdkEventKey* event,
gpointer func_data) {
/* notify each AtkKeySnoopFunc in turn... */
MaiKeyEventInfo* info = g_new0(MaiKeyEventInfo, 1);
gint consumed = 0;
if (sKey_listener_list) {
GHashTable* new_hash = g_hash_table_new(nullptr, nullptr);
g_hash_table_foreach(sKey_listener_list, insert_hf, new_hash);
info->key_event = atk_key_event_from_gdk_event_key(event);
info->func_data = func_data;
consumed = g_hash_table_foreach_steal(new_hash, notify_hf, info);
g_hash_table_destroy(new_hash);
g_free(info->key_event);
}
g_free(info);
return (consumed ? 1 : 0);
}
static guint sKey_snooper_id = 0;
static guint mai_util_add_key_event_listener(AtkKeySnoopFunc listener,
gpointer data) {
if (MOZ_UNLIKELY(!listener)) {
return 0;
}
static guint key = 0;
if (!sKey_listener_list) {
sKey_listener_list = g_hash_table_new(nullptr, nullptr);
}
// If we have no registered event listeners then we need to (re)install the
// key event snooper.
if (g_hash_table_size(sKey_listener_list) == 0) {
sKey_snooper_id = gtk_key_snooper_install(mai_key_snooper, data);
}
AtkKeySnoopFuncPointer atkKeySnoop;
atkKeySnoop.func_ptr = listener;
key++;
g_hash_table_insert(sKey_listener_list, GUINT_TO_POINTER(key),
atkKeySnoop.data);
return key;
}
static void mai_util_remove_key_event_listener(guint remove_listener) {
if (!sKey_listener_list) {
// atk-bridge is initialized with gail (e.g. yelp)
// try gail_remove_key_event_listener
return gail_remove_key_event_listener(remove_listener);
}
g_hash_table_remove(sKey_listener_list, GUINT_TO_POINTER(remove_listener));
if (g_hash_table_size(sKey_listener_list) == 0) {
gtk_key_snooper_remove(sKey_snooper_id);
}
}
static AtkObject* mai_util_get_root() {
ApplicationAccessible* app = ApplicationAcc();
if (app) return app->GetAtkObject();
// We've shutdown, try to use gail instead
// (to avoid assert in spi_atk_tidy_windows())
// XXX tbsaunde then why didn't we replace the gail atk_util impl?
if (gail_get_root) return gail_get_root();
return nullptr;
}
static const gchar* mai_util_get_toolkit_name() { return MAI_NAME; }
static const gchar* mai_util_get_toolkit_version() { return MAI_VERSION; }
static void _listener_info_destroy(gpointer data) { g_free(data); }
static void window_added(AtkObject* atk_obj, guint index, AtkObject* child) {
if (!IS_MAI_OBJECT(child)) return;
static guint id = g_signal_lookup("create", MAI_TYPE_ATK_OBJECT);
g_signal_emit(child, id, 0);
}
static void window_removed(AtkObject* atk_obj, guint index, AtkObject* child) {
if (!IS_MAI_OBJECT(child)) return;
static guint id = g_signal_lookup("destroy", MAI_TYPE_ATK_OBJECT);
g_signal_emit(child, id, 0);
}
static void UtilInterfaceInit(MaiUtilClass* klass) {
AtkUtilClass* atk_class;
gpointer data;
data = g_type_class_peek(ATK_TYPE_UTIL);
atk_class = ATK_UTIL_CLASS(data);
// save gail function pointer
gail_add_global_event_listener = atk_class->add_global_event_listener;
gail_remove_global_event_listener = atk_class->remove_global_event_listener;
gail_remove_key_event_listener = atk_class->remove_key_event_listener;
gail_get_root = atk_class->get_root;
atk_class->add_global_event_listener = mai_util_add_global_event_listener;
atk_class->remove_global_event_listener =
mai_util_remove_global_event_listener;
atk_class->add_key_event_listener = mai_util_add_key_event_listener;
atk_class->remove_key_event_listener = mai_util_remove_key_event_listener;
atk_class->get_root = mai_util_get_root;
atk_class->get_toolkit_name = mai_util_get_toolkit_name;
atk_class->get_toolkit_version = mai_util_get_toolkit_version;
sListener_list = g_hash_table_new_full(g_int_hash, g_int_equal, nullptr,
_listener_info_destroy);
// Keep track of added/removed windows.
AtkObject* root = atk_get_root();
g_signal_connect(root, "children-changed::add", (GCallback)window_added,
nullptr);
g_signal_connect(root, "children-changed::remove", (GCallback)window_removed,
nullptr);
}
}
GType mai_util_get_type() {
static GType type = 0;
if (!type) {
static const GTypeInfo tinfo = {
sizeof(MaiUtilClass),
(GBaseInitFunc) nullptr, /* base init */
(GBaseFinalizeFunc) nullptr, /* base finalize */
(GClassInitFunc)UtilInterfaceInit, /* class init */
(GClassFinalizeFunc) nullptr, /* class finalize */
nullptr, /* class data */
sizeof(MaiUtil), /* instance size */
0, /* nb preallocs */
(GInstanceInitFunc) nullptr, /* instance init */
nullptr /* value table */
};
type =
g_type_register_static(ATK_TYPE_UTIL, "MaiUtil", &tinfo, GTypeFlags(0));
}
return type;
}