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/* -*- 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 "TimeChangeObserver.h"
#include "mozilla/Hal.h"
#include "mozilla/Observer.h"
#include "mozilla/HalTypes.h"
#include "nsWeakPtr.h"
#include "nsTObserverArray.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPtr.h"
#include "nsPIDOMWindow.h"
#include "nsContentUtils.h"
#include "nsIObserverService.h"
#include "nsIDocument.h"
using namespace mozilla;
using namespace mozilla::hal;
using namespace mozilla::services;
class nsSystemTimeChangeObserver : public SystemClockChangeObserver,
public SystemTimezoneChangeObserver
{
typedef nsTObserverArray<nsWeakPtr> ListenerArray;
public:
static nsSystemTimeChangeObserver* GetInstance();
virtual ~nsSystemTimeChangeObserver();
// Implementing hal::SystemClockChangeObserver::Notify()
void Notify(const int64_t& aClockDeltaMS);
// Implementing hal::SystemTimezoneChangeObserver::Notify()
void Notify(
const mozilla::hal::SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo);
nsresult AddWindowListenerImpl(nsPIDOMWindowInner* aWindow);
nsresult RemoveWindowListenerImpl(nsPIDOMWindowInner* aWindow);
private:
nsSystemTimeChangeObserver() { };
ListenerArray mWindowListeners;
void FireMozTimeChangeEvent();
};
StaticAutoPtr<nsSystemTimeChangeObserver> sObserver;
nsSystemTimeChangeObserver* nsSystemTimeChangeObserver::GetInstance()
{
if (!sObserver) {
sObserver = new nsSystemTimeChangeObserver();
ClearOnShutdown(&sObserver);
}
return sObserver;
}
nsSystemTimeChangeObserver::~nsSystemTimeChangeObserver()
{
UnregisterSystemClockChangeObserver(this);
UnregisterSystemTimezoneChangeObserver(this);
}
void
nsSystemTimeChangeObserver::FireMozTimeChangeEvent()
{
ListenerArray::ForwardIterator iter(mWindowListeners);
while (iter.HasMore()) {
nsWeakPtr weakWindow = iter.GetNext();
nsCOMPtr<nsPIDOMWindowInner> innerWindow = do_QueryReferent(weakWindow);
nsCOMPtr<nsPIDOMWindowOuter> outerWindow;
nsCOMPtr<nsIDocument> document;
if (!innerWindow ||
!(document = innerWindow->GetExtantDoc()) ||
!(outerWindow = innerWindow->GetOuterWindow())) {
mWindowListeners.RemoveElement(weakWindow);
continue;
}
nsContentUtils::DispatchTrustedEvent(document, outerWindow,
NS_LITERAL_STRING("moztimechange"), /* bubbles = */ true,
/* canceable = */ false);
}
}
void
nsSystemTimeChangeObserver::Notify(const int64_t& aClockDeltaMS)
{
// Notify observers that the system clock has been adjusted.
nsCOMPtr<nsIObserverService> observerService = GetObserverService();
if (observerService) {
nsString dataStr;
dataStr.AppendFloat(static_cast<double>(aClockDeltaMS));
observerService->NotifyObservers(
nullptr, "system-clock-change", dataStr.get());
}
FireMozTimeChangeEvent();
}
void
nsSystemTimeChangeObserver::Notify(
const SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo)
{
FireMozTimeChangeEvent();
}
nsresult
mozilla::time::AddWindowListener(nsPIDOMWindowInner* aWindow)
{
return nsSystemTimeChangeObserver::GetInstance()->AddWindowListenerImpl(aWindow);
}
nsresult
nsSystemTimeChangeObserver::AddWindowListenerImpl(nsPIDOMWindowInner* aWindow)
{
if (!aWindow) {
return NS_ERROR_ILLEGAL_VALUE;
}
nsWeakPtr windowWeakRef = do_GetWeakReference(aWindow);
NS_ASSERTION(windowWeakRef, "nsIDOMWindow implementations shuld support weak ref");
if (mWindowListeners.IndexOf(windowWeakRef) !=
ListenerArray::array_type::NoIndex) {
return NS_OK;
}
if (mWindowListeners.IsEmpty()) {
RegisterSystemClockChangeObserver(sObserver);
RegisterSystemTimezoneChangeObserver(sObserver);
}
mWindowListeners.AppendElement(windowWeakRef);
return NS_OK;
}
nsresult
mozilla::time::RemoveWindowListener(nsPIDOMWindowInner* aWindow)
{
if (!sObserver) {
return NS_OK;
}
return nsSystemTimeChangeObserver::GetInstance()->RemoveWindowListenerImpl(aWindow);
}
nsresult
nsSystemTimeChangeObserver::RemoveWindowListenerImpl(nsPIDOMWindowInner* aWindow)
{
if (!aWindow) {
return NS_OK;
}
nsWeakPtr windowWeakRef = do_GetWeakReference(aWindow);
mWindowListeners.RemoveElement(windowWeakRef);
if (mWindowListeners.IsEmpty()) {
UnregisterSystemClockChangeObserver(sObserver);
UnregisterSystemTimezoneChangeObserver(sObserver);
}
return NS_OK;
}
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