1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/time/TimeChangeObserver.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,179 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.7 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "TimeChangeObserver.h"
1.10 +#include "mozilla/Hal.h"
1.11 +#include "mozilla/Observer.h"
1.12 +#include "mozilla/HalTypes.h"
1.13 +#include "nsWeakPtr.h"
1.14 +#include "nsTObserverArray.h"
1.15 +#include "mozilla/ClearOnShutdown.h"
1.16 +#include "mozilla/Services.h"
1.17 +#include "mozilla/StaticPtr.h"
1.18 +#include "nsPIDOMWindow.h"
1.19 +#include "nsContentUtils.h"
1.20 +#include "nsIObserverService.h"
1.21 +#include "nsIDocument.h"
1.22 +
1.23 +using namespace mozilla;
1.24 +using namespace mozilla::hal;
1.25 +using namespace mozilla::services;
1.26 +
1.27 +class nsSystemTimeChangeObserver : public SystemClockChangeObserver,
1.28 + public SystemTimezoneChangeObserver
1.29 +{
1.30 + typedef nsTObserverArray<nsWeakPtr> ListenerArray;
1.31 +public:
1.32 + static nsSystemTimeChangeObserver* GetInstance();
1.33 + virtual ~nsSystemTimeChangeObserver();
1.34 +
1.35 + // Implementing hal::SystemClockChangeObserver::Notify()
1.36 + void Notify(const int64_t& aClockDeltaMS);
1.37 +
1.38 + // Implementing hal::SystemTimezoneChangeObserver::Notify()
1.39 + void Notify(
1.40 + const mozilla::hal::SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo);
1.41 +
1.42 + nsresult AddWindowListenerImpl(nsPIDOMWindow* aWindow);
1.43 + nsresult RemoveWindowListenerImpl(nsPIDOMWindow* aWindow);
1.44 +
1.45 +private:
1.46 + nsSystemTimeChangeObserver() { };
1.47 + ListenerArray mWindowListeners;
1.48 + void FireMozTimeChangeEvent();
1.49 +};
1.50 +
1.51 +StaticAutoPtr<nsSystemTimeChangeObserver> sObserver;
1.52 +
1.53 +nsSystemTimeChangeObserver* nsSystemTimeChangeObserver::GetInstance()
1.54 +{
1.55 + if (!sObserver) {
1.56 + sObserver = new nsSystemTimeChangeObserver();
1.57 + ClearOnShutdown(&sObserver);
1.58 + }
1.59 + return sObserver;
1.60 +}
1.61 +
1.62 +nsSystemTimeChangeObserver::~nsSystemTimeChangeObserver()
1.63 +{
1.64 + UnregisterSystemClockChangeObserver(this);
1.65 + UnregisterSystemTimezoneChangeObserver(this);
1.66 +}
1.67 +
1.68 +void
1.69 +nsSystemTimeChangeObserver::FireMozTimeChangeEvent()
1.70 +{
1.71 + ListenerArray::ForwardIterator iter(mWindowListeners);
1.72 + while (iter.HasMore()) {
1.73 + nsWeakPtr weakWindow = iter.GetNext();
1.74 + nsCOMPtr<nsPIDOMWindow> innerWindow = do_QueryReferent(weakWindow);
1.75 + nsCOMPtr<nsPIDOMWindow> outerWindow;
1.76 + nsCOMPtr<nsIDocument> document;
1.77 + if (!innerWindow ||
1.78 + !(document = innerWindow->GetExtantDoc()) ||
1.79 + !(outerWindow = innerWindow->GetOuterWindow())) {
1.80 + mWindowListeners.RemoveElement(weakWindow);
1.81 + continue;
1.82 + }
1.83 +
1.84 + nsContentUtils::DispatchTrustedEvent(document, outerWindow,
1.85 + NS_LITERAL_STRING("moztimechange"), /* bubbles = */ true,
1.86 + /* canceable = */ false);
1.87 + }
1.88 +}
1.89 +
1.90 +void
1.91 +nsSystemTimeChangeObserver::Notify(const int64_t& aClockDeltaMS)
1.92 +{
1.93 + // Notify observers that the system clock has been adjusted.
1.94 + nsCOMPtr<nsIObserverService> observerService = GetObserverService();
1.95 + if (observerService) {
1.96 + nsString dataStr;
1.97 + dataStr.AppendFloat(static_cast<double>(aClockDeltaMS));
1.98 + observerService->NotifyObservers(
1.99 + nullptr, "system-clock-change", dataStr.get());
1.100 + }
1.101 +
1.102 + FireMozTimeChangeEvent();
1.103 +}
1.104 +
1.105 +void
1.106 +nsSystemTimeChangeObserver::Notify(
1.107 + const SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo)
1.108 +{
1.109 + FireMozTimeChangeEvent();
1.110 +}
1.111 +
1.112 +nsresult
1.113 +mozilla::time::AddWindowListener(nsPIDOMWindow* aWindow)
1.114 +{
1.115 + return nsSystemTimeChangeObserver::GetInstance()->AddWindowListenerImpl(aWindow);
1.116 +}
1.117 +
1.118 +nsresult
1.119 +nsSystemTimeChangeObserver::AddWindowListenerImpl(nsPIDOMWindow* aWindow)
1.120 +{
1.121 + if (!aWindow) {
1.122 + return NS_ERROR_ILLEGAL_VALUE;
1.123 + }
1.124 +
1.125 + if (aWindow->IsOuterWindow()) {
1.126 + aWindow = aWindow->GetCurrentInnerWindow();
1.127 + if (!aWindow) {
1.128 + return NS_ERROR_FAILURE;
1.129 + }
1.130 + }
1.131 +
1.132 + nsWeakPtr windowWeakRef = do_GetWeakReference(aWindow);
1.133 + NS_ASSERTION(windowWeakRef, "nsIDOMWindow implementations shuld support weak ref");
1.134 +
1.135 + if (mWindowListeners.IndexOf(windowWeakRef) !=
1.136 + ListenerArray::array_type::NoIndex) {
1.137 + return NS_OK;
1.138 + }
1.139 +
1.140 + if (mWindowListeners.IsEmpty()) {
1.141 + RegisterSystemClockChangeObserver(sObserver);
1.142 + RegisterSystemTimezoneChangeObserver(sObserver);
1.143 + }
1.144 +
1.145 + mWindowListeners.AppendElement(windowWeakRef);
1.146 + return NS_OK;
1.147 +}
1.148 +
1.149 +nsresult
1.150 +mozilla::time::RemoveWindowListener(nsPIDOMWindow* aWindow)
1.151 +{
1.152 + if (!sObserver) {
1.153 + return NS_OK;
1.154 + }
1.155 +
1.156 + return nsSystemTimeChangeObserver::GetInstance()->RemoveWindowListenerImpl(aWindow);
1.157 +}
1.158 +
1.159 +nsresult
1.160 +nsSystemTimeChangeObserver::RemoveWindowListenerImpl(nsPIDOMWindow* aWindow)
1.161 +{
1.162 + if (!aWindow) {
1.163 + return NS_OK;
1.164 + }
1.165 +
1.166 + if (aWindow->IsOuterWindow()) {
1.167 + aWindow = aWindow->GetCurrentInnerWindow();
1.168 + if (!aWindow) {
1.169 + return NS_ERROR_FAILURE;
1.170 + }
1.171 + }
1.172 +
1.173 + nsWeakPtr windowWeakRef = do_GetWeakReference(aWindow);
1.174 + mWindowListeners.RemoveElement(windowWeakRef);
1.175 +
1.176 + if (mWindowListeners.IsEmpty()) {
1.177 + UnregisterSystemClockChangeObserver(sObserver);
1.178 + UnregisterSystemTimezoneChangeObserver(sObserver);
1.179 + }
1.180 +
1.181 + return NS_OK;
1.182 +}
