mirror of
https://github.com/mozilla/gecko-dev.git
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138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "TimeChangeObserver.h"
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/StaticPtr.h"
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#include "nsPIDOMWindow.h"
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#include "nsDOMEvent.h"
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#include "nsContentUtils.h"
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#include "nsIObserverService.h"
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using namespace mozilla;
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using namespace mozilla::hal;
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using namespace mozilla::services;
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StaticAutoPtr<nsSystemTimeChangeObserver> sObserver;
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nsSystemTimeChangeObserver* nsSystemTimeChangeObserver::GetInstance()
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{
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if (!sObserver) {
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sObserver = new nsSystemTimeChangeObserver();
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ClearOnShutdown(&sObserver);
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}
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return sObserver;
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}
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nsSystemTimeChangeObserver::~nsSystemTimeChangeObserver()
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{
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mWindowListeners.Clear();
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UnregisterSystemClockChangeObserver(this);
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UnregisterSystemTimezoneChangeObserver(this);
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}
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void
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nsSystemTimeChangeObserver::FireMozTimeChangeEvent()
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{
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//Copy mWindowListeners and iterate over windowListeners instead because
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//mWindowListeners may be modified while we loop.
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nsTArray<nsWeakPtr> windowListeners;
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for (uint32_t i = 0; i < mWindowListeners.Length(); i++) {
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windowListeners.AppendElement(mWindowListeners.SafeElementAt(i));
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}
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for (int32_t i = windowListeners.Length() - 1; i >= 0; i--) {
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nsCOMPtr<nsPIDOMWindow> window = do_QueryReferent(windowListeners[i]);
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if (!window) {
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mWindowListeners.RemoveElement(windowListeners[i]);
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return;
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}
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nsCOMPtr<nsIDocument> document = window->GetDoc();
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if (!document) {
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return;
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}
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nsContentUtils::DispatchTrustedEvent(document, window,
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NS_LITERAL_STRING("moztimechange"), /* bubbles = */ true,
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/* canceable = */ false);
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}
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}
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void
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nsSystemTimeChangeObserver::Notify(const int64_t& aClockDeltaMS)
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{
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// Notify observers that the system clock has been adjusted.
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nsCOMPtr<nsIObserverService> observerService = GetObserverService();
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if (observerService) {
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nsString dataStr;
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dataStr.AppendFloat(static_cast<double>(aClockDeltaMS));
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observerService->NotifyObservers(
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nullptr, "system-clock-change", dataStr.get());
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}
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FireMozTimeChangeEvent();
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}
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void
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nsSystemTimeChangeObserver::Notify(
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const SystemTimezoneChangeInformation& aSystemTimezoneChangeInfo)
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{
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FireMozTimeChangeEvent();
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}
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nsresult
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nsSystemTimeChangeObserver::AddWindowListener(nsIDOMWindow* aWindow)
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{
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return GetInstance()->AddWindowListenerImpl(aWindow);
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}
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nsresult
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nsSystemTimeChangeObserver::AddWindowListenerImpl(nsIDOMWindow* aWindow)
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{
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if (!aWindow) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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nsCOMPtr<nsIWeakReference> windowWeakRef = do_GetWeakReference(aWindow);
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NS_ASSERTION(windowWeakRef, "nsIDOMWindow implementations shuld support weak ref");
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if (mWindowListeners.IndexOf(windowWeakRef) !=
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nsTArray<nsIDOMWindow*>::NoIndex) {
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return NS_OK;
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}
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if (mWindowListeners.Length() == 0) {
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RegisterSystemClockChangeObserver(sObserver);
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RegisterSystemTimezoneChangeObserver(sObserver);
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}
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mWindowListeners.AppendElement(windowWeakRef);
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return NS_OK;
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}
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nsresult
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nsSystemTimeChangeObserver::RemoveWindowListener(nsIDOMWindow* aWindow)
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{
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if (!sObserver) {
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return NS_OK;
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}
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return GetInstance()->RemoveWindowListenerImpl(aWindow);
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}
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nsresult
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nsSystemTimeChangeObserver::RemoveWindowListenerImpl(nsIDOMWindow* aWindow)
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{
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mWindowListeners.RemoveElement(NS_GetWeakReference(aWindow));
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if (mWindowListeners.Length() == 0) {
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UnregisterSystemClockChangeObserver(sObserver);
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UnregisterSystemTimezoneChangeObserver(sObserver);
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}
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return NS_OK;
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}
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