michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "TimeChangeObserver.h"
michael@0: #include "mozilla/Hal.h"
michael@0: #include "mozilla/Observer.h"
michael@0: #include "mozilla/HalTypes.h"
michael@0: #include "nsWeakPtr.h"
michael@0: #include "nsTObserverArray.h"
michael@0: #include "mozilla/ClearOnShutdown.h"
michael@0: #include "mozilla/Services.h"
michael@0: #include "mozilla/StaticPtr.h"
michael@0: #include "nsPIDOMWindow.h"
michael@0: #include "nsContentUtils.h"
michael@0: #include "nsIObserverService.h"
michael@0: #include "nsIDocument.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::hal;
michael@0: using namespace mozilla::services;
michael@0: 
michael@0: class nsSystemTimeChangeObserver : public SystemClockChangeObserver,
michael@0:                                    public SystemTimezoneChangeObserver
michael@0: {
michael@0:   typedef nsTObserverArray<nsWeakPtr> ListenerArray;
michael@0: public:
michael@0:   static nsSystemTimeChangeObserver* GetInstance();
michael@0:   virtual ~nsSystemTimeChangeObserver();
michael@0: 
michael@0:   // Implementing hal::SystemClockChangeObserver::Notify()
michael@0:   void Notify(const int64_t& aClockDeltaMS);
michael@0: 
michael@0:   // Implementing hal::SystemTimezoneChangeObserver::Notify()
michael@0:   void Notify(
michael@0:     const mozilla::hal::SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo);
michael@0: 
michael@0:   nsresult AddWindowListenerImpl(nsPIDOMWindow* aWindow);
michael@0:   nsresult RemoveWindowListenerImpl(nsPIDOMWindow* aWindow);
michael@0: 
michael@0: private:
michael@0:   nsSystemTimeChangeObserver() { };
michael@0:   ListenerArray mWindowListeners;
michael@0:   void FireMozTimeChangeEvent();
michael@0: };
michael@0: 
michael@0: StaticAutoPtr<nsSystemTimeChangeObserver> sObserver;
michael@0: 
michael@0: nsSystemTimeChangeObserver* nsSystemTimeChangeObserver::GetInstance()
michael@0: {
michael@0:   if (!sObserver) {
michael@0:     sObserver = new nsSystemTimeChangeObserver();
michael@0:     ClearOnShutdown(&sObserver);
michael@0:   }
michael@0:   return sObserver;
michael@0: }
michael@0: 
michael@0: nsSystemTimeChangeObserver::~nsSystemTimeChangeObserver()
michael@0: {
michael@0:   UnregisterSystemClockChangeObserver(this);
michael@0:   UnregisterSystemTimezoneChangeObserver(this);
michael@0: }
michael@0: 
michael@0: void
michael@0: nsSystemTimeChangeObserver::FireMozTimeChangeEvent()
michael@0: {
michael@0:   ListenerArray::ForwardIterator iter(mWindowListeners);
michael@0:   while (iter.HasMore()) {
michael@0:     nsWeakPtr weakWindow = iter.GetNext();
michael@0:     nsCOMPtr<nsPIDOMWindow> innerWindow = do_QueryReferent(weakWindow);
michael@0:     nsCOMPtr<nsPIDOMWindow> outerWindow;
michael@0:     nsCOMPtr<nsIDocument> document;
michael@0:     if (!innerWindow ||
michael@0:         !(document = innerWindow->GetExtantDoc()) ||
michael@0:         !(outerWindow = innerWindow->GetOuterWindow())) {
michael@0:       mWindowListeners.RemoveElement(weakWindow);
michael@0:       continue;
michael@0:     }
michael@0: 
michael@0:     nsContentUtils::DispatchTrustedEvent(document, outerWindow,
michael@0:       NS_LITERAL_STRING("moztimechange"), /* bubbles = */ true,
michael@0:       /* canceable = */ false);
michael@0:   }
michael@0: }
michael@0: 
michael@0: void
michael@0: nsSystemTimeChangeObserver::Notify(const int64_t& aClockDeltaMS)
michael@0: {
michael@0:   // Notify observers that the system clock has been adjusted.
michael@0:   nsCOMPtr<nsIObserverService> observerService = GetObserverService();
michael@0:   if (observerService) {
michael@0:     nsString dataStr;
michael@0:     dataStr.AppendFloat(static_cast<double>(aClockDeltaMS));
michael@0:     observerService->NotifyObservers(
michael@0:       nullptr, "system-clock-change", dataStr.get());
michael@0:   }
michael@0: 
michael@0:   FireMozTimeChangeEvent();
michael@0: }
michael@0: 
michael@0: void
michael@0: nsSystemTimeChangeObserver::Notify(
michael@0:   const SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo)
michael@0: {
michael@0:   FireMozTimeChangeEvent();
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: mozilla::time::AddWindowListener(nsPIDOMWindow* aWindow)
michael@0: {
michael@0:   return nsSystemTimeChangeObserver::GetInstance()->AddWindowListenerImpl(aWindow);
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsSystemTimeChangeObserver::AddWindowListenerImpl(nsPIDOMWindow* aWindow)
michael@0: {
michael@0:   if (!aWindow) {
michael@0:     return NS_ERROR_ILLEGAL_VALUE;
michael@0:   }
michael@0: 
michael@0:   if (aWindow->IsOuterWindow()) {
michael@0:     aWindow = aWindow->GetCurrentInnerWindow();
michael@0:     if (!aWindow) {
michael@0:       return NS_ERROR_FAILURE;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   nsWeakPtr windowWeakRef = do_GetWeakReference(aWindow);
michael@0:   NS_ASSERTION(windowWeakRef, "nsIDOMWindow implementations shuld support weak ref");
michael@0: 
michael@0:   if (mWindowListeners.IndexOf(windowWeakRef) !=
michael@0:       ListenerArray::array_type::NoIndex) {
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (mWindowListeners.IsEmpty()) {
michael@0:     RegisterSystemClockChangeObserver(sObserver);
michael@0:     RegisterSystemTimezoneChangeObserver(sObserver);
michael@0:   }
michael@0: 
michael@0:   mWindowListeners.AppendElement(windowWeakRef);
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: mozilla::time::RemoveWindowListener(nsPIDOMWindow* aWindow)
michael@0: {
michael@0:   if (!sObserver) {
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   return nsSystemTimeChangeObserver::GetInstance()->RemoveWindowListenerImpl(aWindow);
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsSystemTimeChangeObserver::RemoveWindowListenerImpl(nsPIDOMWindow* aWindow)
michael@0: {
michael@0:   if (!aWindow) {
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (aWindow->IsOuterWindow()) {
michael@0:     aWindow = aWindow->GetCurrentInnerWindow();
michael@0:     if (!aWindow) {
michael@0:       return NS_ERROR_FAILURE;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   nsWeakPtr windowWeakRef = do_GetWeakReference(aWindow);
michael@0:   mWindowListeners.RemoveElement(windowWeakRef);
michael@0: 
michael@0:   if (mWindowListeners.IsEmpty()) {
michael@0:     UnregisterSystemClockChangeObserver(sObserver);
michael@0:     UnregisterSystemTimezoneChangeObserver(sObserver);
michael@0:   }
michael@0: 
michael@0:   return NS_OK;
michael@0: }