dom/base/UIDirectionManager.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/UIDirectionManager.h"
   8 #include "mozilla/Preferences.h"
   9 #include "nsIWindowMediator.h"
  10 #include "nsDocShell.h"
  11 #include "mozilla/dom/Document.h"
  12 #include "mozilla/SimpleEnumerator.h"
  13
  14 namespace mozilla {
  15 namespace dom {
  16
  17 /* static */
  18 void OnPrefChange(const char* aPrefName, void*) {
  19   // Iterate over all of the windows and notify them of the direction change.
  20   nsCOMPtr<nsIWindowMediator> windowMediator =
  21       do_GetService(NS_WINDOWMEDIATOR_CONTRACTID);
  22   NS_ENSURE_TRUE_VOID(windowMediator);
  23
  24   nsCOMPtr<nsISimpleEnumerator> windowEnumerator;
  25   windowMediator->GetEnumerator(nullptr, getter_AddRefs(windowEnumerator));
  26   NS_ENSURE_TRUE_VOID(windowEnumerator);
  27
  28   for (auto& elements : SimpleEnumerator<nsISupports>(windowEnumerator)) {
  29     nsCOMPtr<nsPIDOMWindowOuter> window = do_QueryInterface(elements);
  30     if (window->Closed()) {
  31       continue;
  32     }
  33
  34     nsCOMPtr<nsIDocShell> rootDocShell = window->GetDocShell();
  35     nsCOMPtr<nsISimpleEnumerator> docShellEnumerator;
  36     rootDocShell->GetDocShellEnumerator(nsIDocShell::typeAll,
  37                                         nsIDocShell::ENUMERATE_FORWARDS,
  38                                         getter_AddRefs(docShellEnumerator));
  39     NS_ENSURE_TRUE_VOID(docShellEnumerator);
  40     for (auto& docShell : SimpleEnumerator<nsIDocShell>(docShellEnumerator)) {
  41       if (nsCOMPtr<nsPIDOMWindowOuter> win = do_GetInterface(docShell)) {
  42         if (dom::Document* doc = win->GetExtantDoc()) {
  43           doc->ResetDocumentDirection();
  44         }
  45       }
  46     }
  47   }
  48 }
  49
  50 /* static */
  51 void UIDirectionManager::Initialize() {
  52   DebugOnly<nsresult> rv =
  53       Preferences::RegisterCallback(OnPrefChange, "intl.uidirection");
  54   MOZ_ASSERT(NS_SUCCEEDED(rv), "Failed to observe \"intl.uidirection\"");
  55 }
  56
  57 /* static */
  58 void UIDirectionManager::Shutdown() {
  59   Preferences::UnregisterCallback(OnPrefChange, "intl.uidirection");
  60 }
  61
  62 }  // namespace dom
  63 }  // namespace mozilla