The Tor Browser: dom/time/TimeChangeObserver.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     4  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "TimeChangeObserver.h"

     7 #include "mozilla/Hal.h"

     8 #include "mozilla/Observer.h"

     9 #include "mozilla/HalTypes.h"

    10 #include "nsWeakPtr.h"

    11 #include "nsTObserverArray.h"

    12 #include "mozilla/ClearOnShutdown.h"

    13 #include "mozilla/Services.h"

    14 #include "mozilla/StaticPtr.h"

    15 #include "nsPIDOMWindow.h"

    16 #include "nsContentUtils.h"

    17 #include "nsIObserverService.h"

    18 #include "nsIDocument.h"

    20 using namespace mozilla;

    21 using namespace mozilla::hal;

    22 using namespace mozilla::services;

    24 class nsSystemTimeChangeObserver : public SystemClockChangeObserver,

    25                                    public SystemTimezoneChangeObserver

    26 {

    27   typedef nsTObserverArray<nsWeakPtr> ListenerArray;

    28 public:

    29   static nsSystemTimeChangeObserver* GetInstance();

    30   virtual ~nsSystemTimeChangeObserver();

    32   // Implementing hal::SystemClockChangeObserver::Notify()

    33   void Notify(const int64_t& aClockDeltaMS);

    35   // Implementing hal::SystemTimezoneChangeObserver::Notify()

    36   void Notify(

    37     const mozilla::hal::SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo);

    39   nsresult AddWindowListenerImpl(nsPIDOMWindow* aWindow);

    40   nsresult RemoveWindowListenerImpl(nsPIDOMWindow* aWindow);

    42 private:

    43   nsSystemTimeChangeObserver() { };

    44   ListenerArray mWindowListeners;

    45   void FireMozTimeChangeEvent();

    46 };

    48 StaticAutoPtr<nsSystemTimeChangeObserver> sObserver;

    50 nsSystemTimeChangeObserver* nsSystemTimeChangeObserver::GetInstance()

    51 {

    52   if (!sObserver) {

    53     sObserver = new nsSystemTimeChangeObserver();

    54     ClearOnShutdown(&sObserver);

    55   }

    56   return sObserver;

    57 }

    59 nsSystemTimeChangeObserver::~nsSystemTimeChangeObserver()

    60 {

    61   UnregisterSystemClockChangeObserver(this);

    62   UnregisterSystemTimezoneChangeObserver(this);

    63 }

    65 void

    66 nsSystemTimeChangeObserver::FireMozTimeChangeEvent()

    67 {

    68   ListenerArray::ForwardIterator iter(mWindowListeners);

    69   while (iter.HasMore()) {

    70     nsWeakPtr weakWindow = iter.GetNext();

    71     nsCOMPtr<nsPIDOMWindow> innerWindow = do_QueryReferent(weakWindow);

    72     nsCOMPtr<nsPIDOMWindow> outerWindow;

    73     nsCOMPtr<nsIDocument> document;

    74     if (!innerWindow ||

    75         !(document = innerWindow->GetExtantDoc()) ||

    76         !(outerWindow = innerWindow->GetOuterWindow())) {

    77       mWindowListeners.RemoveElement(weakWindow);

    78       continue;

    79     }

    81     nsContentUtils::DispatchTrustedEvent(document, outerWindow,

    82       NS_LITERAL_STRING("moztimechange"), /* bubbles = */ true,

    83       /* canceable = */ false);

    84   }

    85 }

    87 void

    88 nsSystemTimeChangeObserver::Notify(const int64_t& aClockDeltaMS)

    89 {

    90   // Notify observers that the system clock has been adjusted.

    91   nsCOMPtr<nsIObserverService> observerService = GetObserverService();

    92   if (observerService) {

    93     nsString dataStr;

    94     dataStr.AppendFloat(static_cast<double>(aClockDeltaMS));

    95     observerService->NotifyObservers(

    96       nullptr, "system-clock-change", dataStr.get());

    97   }

    99   FireMozTimeChangeEvent();

   100 }

   102 void

   103 nsSystemTimeChangeObserver::Notify(

   104   const SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo)

   105 {

   106   FireMozTimeChangeEvent();

   107 }

   109 nsresult

   110 mozilla::time::AddWindowListener(nsPIDOMWindow* aWindow)

   111 {

   112   return nsSystemTimeChangeObserver::GetInstance()->AddWindowListenerImpl(aWindow);

   113 }

   115 nsresult

   116 nsSystemTimeChangeObserver::AddWindowListenerImpl(nsPIDOMWindow* aWindow)

   117 {

   118   if (!aWindow) {

   119     return NS_ERROR_ILLEGAL_VALUE;

   120   }

   122   if (aWindow->IsOuterWindow()) {

   123     aWindow = aWindow->GetCurrentInnerWindow();

   124     if (!aWindow) {

   125       return NS_ERROR_FAILURE;

   126     }

   127   }

   129   nsWeakPtr windowWeakRef = do_GetWeakReference(aWindow);

   130   NS_ASSERTION(windowWeakRef, "nsIDOMWindow implementations shuld support weak ref");

   132   if (mWindowListeners.IndexOf(windowWeakRef) !=

   133       ListenerArray::array_type::NoIndex) {

   134     return NS_OK;

   135   }

   137   if (mWindowListeners.IsEmpty()) {

   138     RegisterSystemClockChangeObserver(sObserver);

   139     RegisterSystemTimezoneChangeObserver(sObserver);

   140   }

   142   mWindowListeners.AppendElement(windowWeakRef);

   143   return NS_OK;

   144 }

   146 nsresult

   147 mozilla::time::RemoveWindowListener(nsPIDOMWindow* aWindow)

   148 {

   149   if (!sObserver) {

   150     return NS_OK;

   151   }

   153   return nsSystemTimeChangeObserver::GetInstance()->RemoveWindowListenerImpl(aWindow);

   154 }

   156 nsresult

   157 nsSystemTimeChangeObserver::RemoveWindowListenerImpl(nsPIDOMWindow* aWindow)

   158 {

   159   if (!aWindow) {

   160     return NS_OK;

   161   }

   163   if (aWindow->IsOuterWindow()) {

   164     aWindow = aWindow->GetCurrentInnerWindow();

   165     if (!aWindow) {

   166       return NS_ERROR_FAILURE;

   167     }

   168   }

   170   nsWeakPtr windowWeakRef = do_GetWeakReference(aWindow);

   171   mWindowListeners.RemoveElement(windowWeakRef);

   173   if (mWindowListeners.IsEmpty()) {

   174     UnregisterSystemClockChangeObserver(sObserver);

   175     UnregisterSystemTimezoneChangeObserver(sObserver);

   176   }

   178   return NS_OK;

   179 }

The Tor Browser / file revision