tor-browser

The Tor Browser
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UIDirectionManager.cpp (2832B)

      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 
      9 #include "mozilla/Preferences.h"
     10 #include "mozilla/Services.h"
     11 #include "mozilla/SimpleEnumerator.h"
     12 #include "mozilla/dom/Document.h"
     13 #include "nsDocShell.h"
     14 #include "nsIObserverService.h"
     15 #include "nsIWindowMediator.h"
     16 #include "nsServiceManagerUtils.h"
     17 
     18 namespace mozilla::dom {
     19 
     20 NS_IMPL_ISUPPORTS(UIDirectionManager, nsIObserver)
     21 
     22 /* static */
     23 NS_IMETHODIMP
     24 UIDirectionManager::Observe(nsISupports* aSubject, const char* aTopic,
     25                            const char16_t* aData) {
     26  NS_ENSURE_FALSE(strcmp(aTopic, "intl:app-locales-changed"), NS_ERROR_FAILURE);
     27 
     28  // Iterate over all of the windows and notify them of the direction change.
     29  nsCOMPtr<nsIWindowMediator> windowMediator =
     30      do_GetService(NS_WINDOWMEDIATOR_CONTRACTID);
     31  NS_ENSURE_TRUE(windowMediator, NS_ERROR_FAILURE);
     32 
     33  nsCOMPtr<nsISimpleEnumerator> windowEnumerator;
     34  windowMediator->GetEnumerator(nullptr, getter_AddRefs(windowEnumerator));
     35  NS_ENSURE_TRUE(windowEnumerator, NS_ERROR_FAILURE);
     36 
     37  for (auto& elements : SimpleEnumerator<nsISupports>(windowEnumerator)) {
     38    nsCOMPtr<nsPIDOMWindowOuter> window = do_QueryInterface(elements);
     39    if (window->Closed()) {
     40      continue;
     41    }
     42 
     43    RefPtr<BrowsingContext> context = window->GetBrowsingContext();
     44    MOZ_DIAGNOSTIC_ASSERT(context);
     45 
     46    if (context->IsDiscarded()) {
     47      continue;
     48    }
     49 
     50    context->PreOrderWalk([](BrowsingContext* aContext) {
     51      if (dom::Document* doc = aContext->GetDocument()) {
     52        doc->ResetDocumentDirection();
     53      }
     54    });
     55  }
     56  return NS_OK;
     57 }
     58 
     59 /* static */
     60 void UIDirectionManager::Initialize() {
     61  MOZ_ASSERT(!gUIDirectionManager);
     62  MOZ_ASSERT(NS_IsMainThread());
     63 
     64  RefPtr<UIDirectionManager> observer = new UIDirectionManager();
     65 
     66  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
     67  if (NS_WARN_IF(!obs)) {
     68    return;
     69  }
     70  obs->AddObserver(observer, "intl:app-locales-changed", false);
     71 
     72  gUIDirectionManager = observer;
     73 }
     74 
     75 /* static */
     76 void UIDirectionManager::Shutdown() {
     77  MOZ_ASSERT(NS_IsMainThread());
     78  if (!gUIDirectionManager) {
     79    return;
     80  }
     81  RefPtr<UIDirectionManager> observer = gUIDirectionManager;
     82  gUIDirectionManager = nullptr;
     83 
     84  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
     85  if (!obs) {
     86    return;
     87  }
     88 
     89  obs->RemoveObserver(observer, "intl:app-locales-changed");
     90 }
     91 
     92 mozilla::StaticRefPtr<UIDirectionManager>
     93    UIDirectionManager::gUIDirectionManager;
     94 
     95 }  // namespace mozilla::dom