зеркало из https://github.com/mozilla/gecko-dev.git
348 строки
11 KiB
C++
348 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ApplicationAccessible.h"
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#include "mozilla/Likely.h"
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#include "nsAccessibilityService.h"
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#include "nsMai.h"
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#include <atk/atkobject.h>
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#include <atk/atkutil.h>
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#include <gtk/gtk.h>
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#include <string.h>
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using namespace mozilla;
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using namespace mozilla::a11y;
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typedef AtkUtil MaiUtil;
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typedef AtkUtilClass MaiUtilClass;
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#define MAI_VERSION MOZILLA_VERSION
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#define MAI_NAME "Gecko"
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extern "C" {
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static guint (*gail_add_global_event_listener)(GSignalEmissionHook listener,
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const gchar* event_type);
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static void (*gail_remove_global_event_listener)(guint remove_listener);
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static void (*gail_remove_key_event_listener)(guint remove_listener);
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static AtkObject* (*gail_get_root)();
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}
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struct MaiUtilListenerInfo {
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gint key;
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guint signal_id;
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gulong hook_id;
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// For window create/destory/minimize/maximize/restore/activate/deactivate
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// events, we'll chain gail_util's add/remove_global_event_listener.
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// So we store the listenerid returned by gail's add_global_event_listener
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// in this structure to call gail's remove_global_event_listener later.
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guint gail_listenerid;
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};
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static GHashTable* sListener_list = nullptr;
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static gint sListener_idx = 1;
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extern "C" {
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static guint add_listener(GSignalEmissionHook listener,
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const gchar* object_type, const gchar* signal,
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const gchar* hook_data, guint gail_listenerid = 0) {
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GType type;
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guint signal_id;
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gint rc = 0;
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type = g_type_from_name(object_type);
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if (type) {
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signal_id = g_signal_lookup(signal, type);
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if (signal_id > 0) {
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MaiUtilListenerInfo* listener_info;
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rc = sListener_idx;
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listener_info =
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(MaiUtilListenerInfo*)g_malloc(sizeof(MaiUtilListenerInfo));
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listener_info->key = sListener_idx;
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listener_info->hook_id = g_signal_add_emission_hook(
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signal_id, 0, listener, g_strdup(hook_data), (GDestroyNotify)g_free);
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listener_info->signal_id = signal_id;
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listener_info->gail_listenerid = gail_listenerid;
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g_hash_table_insert(sListener_list, &(listener_info->key), listener_info);
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sListener_idx++;
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} else {
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g_warning("Invalid signal type %s\n", signal);
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}
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} else {
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g_warning("Invalid object type %s\n", object_type);
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}
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return rc;
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}
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static guint mai_util_add_global_event_listener(GSignalEmissionHook listener,
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const gchar* event_type) {
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guint rc = 0;
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gchar** split_string;
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split_string = g_strsplit(event_type, ":", 3);
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if (split_string) {
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if (!strcmp("window", split_string[0])) {
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guint gail_listenerid = 0;
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if (gail_add_global_event_listener) {
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// call gail's function to track gtk native window events
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gail_listenerid = gail_add_global_event_listener(listener, event_type);
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}
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rc = add_listener(listener, "MaiAtkObject", split_string[1], event_type,
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gail_listenerid);
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} else {
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rc = add_listener(listener, split_string[1], split_string[2], event_type);
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}
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g_strfreev(split_string);
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}
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return rc;
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}
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static void mai_util_remove_global_event_listener(guint remove_listener) {
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if (remove_listener > 0) {
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MaiUtilListenerInfo* listener_info;
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gint tmp_idx = remove_listener;
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listener_info =
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(MaiUtilListenerInfo*)g_hash_table_lookup(sListener_list, &tmp_idx);
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if (listener_info != nullptr) {
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if (gail_remove_global_event_listener && listener_info->gail_listenerid) {
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gail_remove_global_event_listener(listener_info->gail_listenerid);
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}
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/* Hook id of 0 and signal id of 0 are invalid */
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if (listener_info->hook_id != 0 && listener_info->signal_id != 0) {
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/* Remove the emission hook */
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g_signal_remove_emission_hook(listener_info->signal_id,
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listener_info->hook_id);
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/* Remove the element from the hash */
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g_hash_table_remove(sListener_list, &tmp_idx);
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} else {
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g_warning("Invalid listener hook_id %ld or signal_id %d\n",
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listener_info->hook_id, listener_info->signal_id);
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}
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} else {
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// atk-bridge is initialized with gail (e.g. yelp)
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// try gail_remove_global_event_listener
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if (gail_remove_global_event_listener) {
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return gail_remove_global_event_listener(remove_listener);
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}
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g_warning("No listener with the specified listener id %d",
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remove_listener);
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}
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} else {
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g_warning("Invalid listener_id %d", remove_listener);
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}
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}
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static AtkKeyEventStruct* atk_key_event_from_gdk_event_key(GdkEventKey* key) {
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AtkKeyEventStruct* event = g_new0(AtkKeyEventStruct, 1);
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switch (key->type) {
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case GDK_KEY_PRESS:
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event->type = ATK_KEY_EVENT_PRESS;
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break;
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case GDK_KEY_RELEASE:
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event->type = ATK_KEY_EVENT_RELEASE;
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break;
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default:
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g_assert_not_reached();
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return nullptr;
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}
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event->state = key->state;
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event->keyval = key->keyval;
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event->length = key->length;
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if (key->string && key->string[0] &&
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g_unichar_isgraph(g_utf8_get_char(key->string))) {
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event->string = key->string;
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} else if (key->type == GDK_KEY_PRESS || key->type == GDK_KEY_RELEASE) {
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event->string = gdk_keyval_name(key->keyval);
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}
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event->keycode = key->hardware_keycode;
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event->timestamp = key->time;
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return event;
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}
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struct MaiKeyEventInfo {
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AtkKeyEventStruct* key_event;
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gpointer func_data;
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};
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union AtkKeySnoopFuncPointer {
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AtkKeySnoopFunc func_ptr;
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gpointer data;
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};
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static gboolean notify_hf(gpointer key, gpointer value, gpointer data) {
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MaiKeyEventInfo* info = (MaiKeyEventInfo*)data;
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AtkKeySnoopFuncPointer atkKeySnoop;
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atkKeySnoop.data = value;
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return (atkKeySnoop.func_ptr)(info->key_event, info->func_data) ? TRUE
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: FALSE;
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}
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static void insert_hf(gpointer key, gpointer value, gpointer data) {
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GHashTable* new_table = (GHashTable*)data;
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g_hash_table_insert(new_table, key, value);
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}
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static GHashTable* sKey_listener_list = nullptr;
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static gint mai_key_snooper(GtkWidget* the_widget, GdkEventKey* event,
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gpointer func_data) {
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/* notify each AtkKeySnoopFunc in turn... */
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MaiKeyEventInfo* info = g_new0(MaiKeyEventInfo, 1);
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gint consumed = 0;
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if (sKey_listener_list) {
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GHashTable* new_hash = g_hash_table_new(nullptr, nullptr);
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g_hash_table_foreach(sKey_listener_list, insert_hf, new_hash);
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info->key_event = atk_key_event_from_gdk_event_key(event);
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info->func_data = func_data;
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consumed = g_hash_table_foreach_steal(new_hash, notify_hf, info);
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g_hash_table_destroy(new_hash);
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g_free(info->key_event);
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}
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g_free(info);
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return (consumed ? 1 : 0);
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}
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static guint sKey_snooper_id = 0;
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static guint mai_util_add_key_event_listener(AtkKeySnoopFunc listener,
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gpointer data) {
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if (MOZ_UNLIKELY(!listener)) {
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return 0;
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}
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static guint key = 0;
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if (!sKey_listener_list) {
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sKey_listener_list = g_hash_table_new(nullptr, nullptr);
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}
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// If we have no registered event listeners then we need to (re)install the
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// key event snooper.
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if (g_hash_table_size(sKey_listener_list) == 0) {
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sKey_snooper_id = gtk_key_snooper_install(mai_key_snooper, data);
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}
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AtkKeySnoopFuncPointer atkKeySnoop;
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atkKeySnoop.func_ptr = listener;
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key++;
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g_hash_table_insert(sKey_listener_list, GUINT_TO_POINTER(key),
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atkKeySnoop.data);
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return key;
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}
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static void mai_util_remove_key_event_listener(guint remove_listener) {
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if (!sKey_listener_list) {
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// atk-bridge is initialized with gail (e.g. yelp)
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// try gail_remove_key_event_listener
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return gail_remove_key_event_listener(remove_listener);
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}
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g_hash_table_remove(sKey_listener_list, GUINT_TO_POINTER(remove_listener));
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if (g_hash_table_size(sKey_listener_list) == 0) {
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gtk_key_snooper_remove(sKey_snooper_id);
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}
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}
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static AtkObject* mai_util_get_root() {
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ApplicationAccessible* app = ApplicationAcc();
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if (app) return app->GetAtkObject();
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// We've shutdown, try to use gail instead
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// (to avoid assert in spi_atk_tidy_windows())
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// XXX tbsaunde then why didn't we replace the gail atk_util impl?
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if (gail_get_root) return gail_get_root();
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return nullptr;
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}
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static const gchar* mai_util_get_toolkit_name() { return MAI_NAME; }
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static const gchar* mai_util_get_toolkit_version() { return MAI_VERSION; }
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static void _listener_info_destroy(gpointer data) { g_free(data); }
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static void window_added(AtkObject* atk_obj, guint index, AtkObject* child) {
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if (!IS_MAI_OBJECT(child)) return;
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static guint id = g_signal_lookup("create", MAI_TYPE_ATK_OBJECT);
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g_signal_emit(child, id, 0);
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}
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static void window_removed(AtkObject* atk_obj, guint index, AtkObject* child) {
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if (!IS_MAI_OBJECT(child)) return;
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static guint id = g_signal_lookup("destroy", MAI_TYPE_ATK_OBJECT);
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g_signal_emit(child, id, 0);
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}
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static void UtilInterfaceInit(MaiUtilClass* klass) {
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AtkUtilClass* atk_class;
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gpointer data;
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data = g_type_class_peek(ATK_TYPE_UTIL);
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atk_class = ATK_UTIL_CLASS(data);
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// save gail function pointer
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gail_add_global_event_listener = atk_class->add_global_event_listener;
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gail_remove_global_event_listener = atk_class->remove_global_event_listener;
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gail_remove_key_event_listener = atk_class->remove_key_event_listener;
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gail_get_root = atk_class->get_root;
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atk_class->add_global_event_listener = mai_util_add_global_event_listener;
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atk_class->remove_global_event_listener =
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mai_util_remove_global_event_listener;
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atk_class->add_key_event_listener = mai_util_add_key_event_listener;
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atk_class->remove_key_event_listener = mai_util_remove_key_event_listener;
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atk_class->get_root = mai_util_get_root;
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atk_class->get_toolkit_name = mai_util_get_toolkit_name;
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atk_class->get_toolkit_version = mai_util_get_toolkit_version;
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sListener_list = g_hash_table_new_full(g_int_hash, g_int_equal, nullptr,
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_listener_info_destroy);
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// Keep track of added/removed windows.
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AtkObject* root = atk_get_root();
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g_signal_connect(root, "children-changed::add", (GCallback)window_added,
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nullptr);
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g_signal_connect(root, "children-changed::remove", (GCallback)window_removed,
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nullptr);
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}
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}
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GType mai_util_get_type() {
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static GType type = 0;
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if (!type) {
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static const GTypeInfo tinfo = {
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sizeof(MaiUtilClass),
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(GBaseInitFunc) nullptr, /* base init */
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(GBaseFinalizeFunc) nullptr, /* base finalize */
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(GClassInitFunc)UtilInterfaceInit, /* class init */
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(GClassFinalizeFunc) nullptr, /* class finalize */
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nullptr, /* class data */
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sizeof(MaiUtil), /* instance size */
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0, /* nb preallocs */
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(GInstanceInitFunc) nullptr, /* instance init */
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nullptr /* value table */
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};
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type =
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g_type_register_static(ATK_TYPE_UTIL, "MaiUtil", &tinfo, GTypeFlags(0));
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}
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return type;
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}
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