зеркало из https://github.com/mozilla/gecko-dev.git
330 строки
10 KiB
C++
330 строки
10 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 "Platform.h"
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#include "nsIAccessibleEvent.h"
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#include "nsIGSettingsService.h"
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#include "nsIServiceManager.h"
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#include "nsMai.h"
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#include "AtkSocketAccessible.h"
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#include "prenv.h"
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#include "prlink.h"
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#ifdef MOZ_ENABLE_DBUS
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# include <dbus/dbus.h>
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#endif
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#include <gtk/gtk.h>
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#ifdef MOZ_WIDGET_GTK
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extern "C" __attribute__((weak, visibility("default"))) int
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atk_bridge_adaptor_init(int*, char**[]);
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#endif
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using namespace mozilla;
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using namespace mozilla::a11y;
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int atkMajorVersion = 1, atkMinorVersion = 12, atkMicroVersion = 0;
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GType (*gAtkTableCellGetTypeFunc)();
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extern "C" {
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typedef GType (*AtkGetTypeType)(void);
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typedef void (*GnomeAccessibilityInit)(void);
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typedef void (*GnomeAccessibilityShutdown)(void);
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}
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static PRLibrary* sATKLib = nullptr;
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static const char sATKLibName[] = "libatk-1.0.so.0";
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static const char sATKHyperlinkImplGetTypeSymbol[] =
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"atk_hyperlink_impl_get_type";
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gboolean toplevel_event_watcher(GSignalInvocationHint*, guint, const GValue*,
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gpointer);
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static bool sToplevel_event_hook_added = false;
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static gulong sToplevel_show_hook = 0;
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static gulong sToplevel_hide_hook = 0;
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GType g_atk_hyperlink_impl_type = G_TYPE_INVALID;
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struct GnomeAccessibilityModule {
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const char* libName;
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PRLibrary* lib;
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const char* initName;
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GnomeAccessibilityInit init;
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const char* shutdownName;
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GnomeAccessibilityShutdown shutdown;
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};
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static GnomeAccessibilityModule sAtkBridge = {
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#ifdef AIX
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"libatk-bridge.a(libatk-bridge.so.0)", nullptr,
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#else
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"libatk-bridge.so", nullptr,
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#endif
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"gnome_accessibility_module_init", nullptr,
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"gnome_accessibility_module_shutdown", nullptr};
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static nsresult LoadGtkModule(GnomeAccessibilityModule& aModule) {
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NS_ENSURE_ARG(aModule.libName);
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if (!(aModule.lib = PR_LoadLibrary(aModule.libName))) {
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// try to load the module with "gtk-2.0/modules" appended
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char* curLibPath = PR_GetLibraryPath();
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nsAutoCString libPath(curLibPath);
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#if defined(LINUX) && defined(__x86_64__)
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libPath.AppendLiteral(":/usr/lib64:/usr/lib");
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#else
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libPath.AppendLiteral(":/usr/lib");
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#endif
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PR_FreeLibraryName(curLibPath);
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int16_t loc1 = 0, loc2 = 0;
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int16_t subLen = 0;
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while (loc2 >= 0) {
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loc2 = libPath.FindChar(':', loc1);
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if (loc2 < 0)
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subLen = libPath.Length() - loc1;
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else
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subLen = loc2 - loc1;
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nsAutoCString sub(Substring(libPath, loc1, subLen));
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sub.AppendLiteral("/gtk-3.0/modules/");
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sub.Append(aModule.libName);
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aModule.lib = PR_LoadLibrary(sub.get());
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if (aModule.lib) break;
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loc1 = loc2 + 1;
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}
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if (!aModule.lib) return NS_ERROR_FAILURE;
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}
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// we have loaded the library, try to get the function ptrs
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if (!(aModule.init = PR_FindFunctionSymbol(aModule.lib, aModule.initName)) ||
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!(aModule.shutdown =
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PR_FindFunctionSymbol(aModule.lib, aModule.shutdownName))) {
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// fail, :(
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PR_UnloadLibrary(aModule.lib);
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aModule.lib = nullptr;
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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void a11y::PlatformInit() {
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if (!ShouldA11yBeEnabled()) return;
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sATKLib = PR_LoadLibrary(sATKLibName);
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if (!sATKLib) return;
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AtkGetTypeType pfn_atk_hyperlink_impl_get_type =
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(AtkGetTypeType)PR_FindFunctionSymbol(sATKLib,
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sATKHyperlinkImplGetTypeSymbol);
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if (pfn_atk_hyperlink_impl_get_type)
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g_atk_hyperlink_impl_type = pfn_atk_hyperlink_impl_get_type();
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AtkGetTypeType pfn_atk_socket_get_type =
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(AtkGetTypeType)PR_FindFunctionSymbol(
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sATKLib, AtkSocketAccessible::sATKSocketGetTypeSymbol);
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if (pfn_atk_socket_get_type) {
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AtkSocketAccessible::g_atk_socket_type = pfn_atk_socket_get_type();
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AtkSocketAccessible::g_atk_socket_embed =
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(AtkSocketEmbedType)PR_FindFunctionSymbol(
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sATKLib, AtkSocketAccessible ::sATKSocketEmbedSymbol);
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AtkSocketAccessible::gCanEmbed =
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AtkSocketAccessible::g_atk_socket_type != G_TYPE_INVALID &&
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AtkSocketAccessible::g_atk_socket_embed;
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}
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gAtkTableCellGetTypeFunc =
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(GType(*)())PR_FindFunctionSymbol(sATKLib, "atk_table_cell_get_type");
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const char* (*atkGetVersion)() =
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(const char* (*)())PR_FindFunctionSymbol(sATKLib, "atk_get_version");
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if (atkGetVersion) {
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const char* version = atkGetVersion();
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if (version) {
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char* endPtr = nullptr;
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atkMajorVersion = strtol(version, &endPtr, 10);
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if (atkMajorVersion != 0L) {
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atkMinorVersion = strtol(endPtr + 1, &endPtr, 10);
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if (atkMinorVersion != 0L)
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atkMicroVersion = strtol(endPtr + 1, &endPtr, 10);
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}
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}
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}
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// Initialize the MAI Utility class, it will overwrite gail_util.
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g_type_class_unref(g_type_class_ref(mai_util_get_type()));
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// Init atk-bridge now
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PR_SetEnv("NO_AT_BRIDGE=0");
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#ifdef MOZ_WIDGET_GTK
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if (atk_bridge_adaptor_init) {
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atk_bridge_adaptor_init(nullptr, nullptr);
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} else
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#endif
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{
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nsresult rv = LoadGtkModule(sAtkBridge);
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if (NS_SUCCEEDED(rv)) {
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(*sAtkBridge.init)();
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}
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}
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if (!sToplevel_event_hook_added) {
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sToplevel_event_hook_added = true;
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sToplevel_show_hook = g_signal_add_emission_hook(
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g_signal_lookup("show", GTK_TYPE_WINDOW), 0, toplevel_event_watcher,
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reinterpret_cast<gpointer>(nsIAccessibleEvent::EVENT_SHOW), nullptr);
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sToplevel_hide_hook = g_signal_add_emission_hook(
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g_signal_lookup("hide", GTK_TYPE_WINDOW), 0, toplevel_event_watcher,
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reinterpret_cast<gpointer>(nsIAccessibleEvent::EVENT_HIDE), nullptr);
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}
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}
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void a11y::PlatformShutdown() {
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if (sToplevel_event_hook_added) {
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sToplevel_event_hook_added = false;
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g_signal_remove_emission_hook(g_signal_lookup("show", GTK_TYPE_WINDOW),
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sToplevel_show_hook);
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g_signal_remove_emission_hook(g_signal_lookup("hide", GTK_TYPE_WINDOW),
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sToplevel_hide_hook);
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}
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if (sAtkBridge.lib) {
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// Do not shutdown/unload atk-bridge,
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// an exit function registered will take care of it
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// if (sAtkBridge.shutdown)
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// (*sAtkBridge.shutdown)();
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// PR_UnloadLibrary(sAtkBridge.lib);
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sAtkBridge.lib = nullptr;
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sAtkBridge.init = nullptr;
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sAtkBridge.shutdown = nullptr;
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}
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// if (sATKLib) {
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// PR_UnloadLibrary(sATKLib);
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// sATKLib = nullptr;
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// }
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}
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static const char sAccEnv[] = "GNOME_ACCESSIBILITY";
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#ifdef MOZ_ENABLE_DBUS
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static DBusPendingCall* sPendingCall = nullptr;
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#endif
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void a11y::PreInit() {
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#ifdef MOZ_ENABLE_DBUS
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static bool sChecked = FALSE;
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if (sChecked) return;
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sChecked = TRUE;
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// dbus is only checked if GNOME_ACCESSIBILITY is unset
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// also make sure that a session bus address is available to prevent dbus from
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// starting a new one. Dbus confuses the test harness when it creates a new
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// process (see bug 693343)
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if (PR_GetEnv(sAccEnv) || !PR_GetEnv("DBUS_SESSION_BUS_ADDRESS")) return;
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DBusConnection* bus = dbus_bus_get(DBUS_BUS_SESSION, nullptr);
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if (!bus) return;
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dbus_connection_set_exit_on_disconnect(bus, FALSE);
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static const char* iface = "org.a11y.Status";
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static const char* member = "IsEnabled";
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DBusMessage* message;
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message =
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dbus_message_new_method_call("org.a11y.Bus", "/org/a11y/bus",
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"org.freedesktop.DBus.Properties", "Get");
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if (!message) goto dbus_done;
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dbus_message_append_args(message, DBUS_TYPE_STRING, &iface, DBUS_TYPE_STRING,
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&member, DBUS_TYPE_INVALID);
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dbus_connection_send_with_reply(bus, message, &sPendingCall, 1000);
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dbus_message_unref(message);
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dbus_done:
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dbus_connection_unref(bus);
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#endif
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}
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bool a11y::ShouldA11yBeEnabled() {
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static bool sChecked = false, sShouldEnable = false;
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if (sChecked) return sShouldEnable;
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sChecked = true;
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EPlatformDisabledState disabledState = PlatformDisabledState();
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if (disabledState == ePlatformIsDisabled) return sShouldEnable = false;
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// check if accessibility enabled/disabled by environment variable
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const char* envValue = PR_GetEnv(sAccEnv);
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if (envValue) return sShouldEnable = !!atoi(envValue);
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#ifdef MOZ_ENABLE_DBUS
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PreInit();
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bool dbusSuccess = false;
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DBusMessage* reply = nullptr;
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if (!sPendingCall) goto dbus_done;
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dbus_pending_call_block(sPendingCall);
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reply = dbus_pending_call_steal_reply(sPendingCall);
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dbus_pending_call_unref(sPendingCall);
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sPendingCall = nullptr;
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if (!reply ||
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dbus_message_get_type(reply) != DBUS_MESSAGE_TYPE_METHOD_RETURN ||
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strcmp(dbus_message_get_signature(reply), DBUS_TYPE_VARIANT_AS_STRING))
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goto dbus_done;
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DBusMessageIter iter, iter_variant, iter_struct;
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dbus_bool_t dResult;
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dbus_message_iter_init(reply, &iter);
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dbus_message_iter_recurse(&iter, &iter_variant);
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switch (dbus_message_iter_get_arg_type(&iter_variant)) {
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case DBUS_TYPE_STRUCT:
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// at-spi2-core 2.2.0-2.2.1 had a bug where it returned a struct
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dbus_message_iter_recurse(&iter_variant, &iter_struct);
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if (dbus_message_iter_get_arg_type(&iter_struct) == DBUS_TYPE_BOOLEAN) {
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dbus_message_iter_get_basic(&iter_struct, &dResult);
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sShouldEnable = dResult;
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dbusSuccess = true;
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}
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break;
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case DBUS_TYPE_BOOLEAN:
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dbus_message_iter_get_basic(&iter_variant, &dResult);
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sShouldEnable = dResult;
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dbusSuccess = true;
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break;
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default:
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break;
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}
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dbus_done:
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if (reply) dbus_message_unref(reply);
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if (dbusSuccess) return sShouldEnable;
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#endif
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// check GSettings
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#define GSETINGS_A11Y_INTERFACE "org.gnome.desktop.interface"
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#define GSETINGS_A11Y_KEY "toolkit-accessibility"
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nsCOMPtr<nsIGSettingsService> gsettings =
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do_GetService(NS_GSETTINGSSERVICE_CONTRACTID);
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nsCOMPtr<nsIGSettingsCollection> a11y_settings;
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if (gsettings) {
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gsettings->GetCollectionForSchema(
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NS_LITERAL_CSTRING(GSETINGS_A11Y_INTERFACE),
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getter_AddRefs(a11y_settings));
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if (a11y_settings) {
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a11y_settings->GetBoolean(NS_LITERAL_CSTRING(GSETINGS_A11Y_KEY),
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&sShouldEnable);
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}
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}
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return sShouldEnable;
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}
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