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-rw-r--r--dom/base/UIDirectionManager.cpp94
1 files changed, 94 insertions, 0 deletions
diff --git a/dom/base/UIDirectionManager.cpp b/dom/base/UIDirectionManager.cpp
new file mode 100644
index 0000000000..4a55555a4a
--- /dev/null
+++ b/dom/base/UIDirectionManager.cpp
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=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 "mozilla/dom/UIDirectionManager.h"
+#include "mozilla/Preferences.h"
+#include "nsIObserverService.h"
+#include "nsIWindowMediator.h"
+#include "nsDocShell.h"
+#include "nsServiceManagerUtils.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/Services.h"
+#include "mozilla/SimpleEnumerator.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_ISUPPORTS(UIDirectionManager, nsIObserver)
+
+/* static */
+NS_IMETHODIMP
+UIDirectionManager::Observe(nsISupports* aSubject, const char* aTopic,
+ const char16_t* aData) {
+ NS_ENSURE_FALSE(strcmp(aTopic, "intl:app-locales-changed"), NS_ERROR_FAILURE);
+
+ // Iterate over all of the windows and notify them of the direction change.
+ nsCOMPtr<nsIWindowMediator> windowMediator =
+ do_GetService(NS_WINDOWMEDIATOR_CONTRACTID);
+ NS_ENSURE_TRUE(windowMediator, NS_ERROR_FAILURE);
+
+ nsCOMPtr<nsISimpleEnumerator> windowEnumerator;
+ windowMediator->GetEnumerator(nullptr, getter_AddRefs(windowEnumerator));
+ NS_ENSURE_TRUE(windowEnumerator, NS_ERROR_FAILURE);
+
+ for (auto& elements : SimpleEnumerator<nsISupports>(windowEnumerator)) {
+ nsCOMPtr<nsPIDOMWindowOuter> window = do_QueryInterface(elements);
+ if (window->Closed()) {
+ continue;
+ }
+
+ RefPtr<BrowsingContext> context = window->GetBrowsingContext();
+ MOZ_DIAGNOSTIC_ASSERT(context);
+
+ if (context->IsDiscarded()) {
+ continue;
+ }
+
+ context->PreOrderWalk([](BrowsingContext* aContext) {
+ if (dom::Document* doc = aContext->GetDocument()) {
+ doc->ResetDocumentDirection();
+ }
+ });
+ }
+ return NS_OK;
+}
+
+/* static */
+void UIDirectionManager::Initialize() {
+ MOZ_ASSERT(!gUIDirectionManager);
+ MOZ_ASSERT(NS_IsMainThread());
+
+ RefPtr<UIDirectionManager> observer = new UIDirectionManager();
+
+ nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+ if (NS_WARN_IF(!obs)) {
+ return;
+ }
+ obs->AddObserver(observer, "intl:app-locales-changed", false);
+
+ gUIDirectionManager = observer;
+}
+
+/* static */
+void UIDirectionManager::Shutdown() {
+ MOZ_ASSERT(NS_IsMainThread());
+ if (!gUIDirectionManager) {
+ return;
+ }
+ RefPtr<UIDirectionManager> observer = gUIDirectionManager;
+ gUIDirectionManager = nullptr;
+
+ nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+ if (!obs) {
+ return;
+ }
+
+ obs->RemoveObserver(observer, "intl:app-locales-changed");
+}
+
+mozilla::StaticRefPtr<UIDirectionManager>
+ UIDirectionManager::gUIDirectionManager;
+
+} // namespace mozilla::dom