gecko/dom/time/TimeChangeObserver.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/ClearOnShutdown.h"
#include "mozilla/StaticPtr.h"
#include "nsPIDOMWindow.h"
#include "nsDOMEvent.h"
#include "nsContentUtils.h"
using namespace mozilla::hal;
using namespace mozilla;
StaticAutoPtr<nsSystemTimeChangeObserver> sObserver;
nsSystemTimeChangeObserver* nsSystemTimeChangeObserver::GetInstance()
{
if (!sObserver) {
sObserver = new nsSystemTimeChangeObserver();
ClearOnShutdown(&sObserver);
}
return sObserver;
}
nsSystemTimeChangeObserver::~nsSystemTimeChangeObserver()
{
mWindowListeners.Clear();
UnregisterSystemTimeChangeObserver(this);
}
void
nsSystemTimeChangeObserver::Notify(const SystemTimeChange& aReason)
{
//Copy mWindowListeners and iterate over windowListeners instead because
//mWindowListeners may be modified while we loop.
nsTArray<nsWeakPtr> windowListeners;
for (uint32_t i = 0; i < mWindowListeners.Length(); i++) {
windowListeners.AppendElement(mWindowListeners.SafeElementAt(i));
}
for (int32_t i = windowListeners.Length() - 1; i >= 0; i--) {
nsCOMPtr<nsPIDOMWindow> window = do_QueryReferent(windowListeners[i]);
if (!window) {
mWindowListeners.RemoveElement(windowListeners[i]);
return;
}
nsCOMPtr<nsIDocument> document = window->GetDoc();
if (!document) {
return;
}
nsContentUtils::DispatchTrustedEvent(document, window,
NS_LITERAL_STRING("moztimechange"), /* bubbles = */ true,
/* canceable = */ false);
}
}
nsresult
nsSystemTimeChangeObserver::AddWindowListener(nsIDOMWindow* aWindow)
{
return GetInstance()->AddWindowListenerImpl(aWindow);
}
nsresult
nsSystemTimeChangeObserver::AddWindowListenerImpl(nsIDOMWindow* aWindow)
{
if (!aWindow) {
return NS_ERROR_ILLEGAL_VALUE;
}
nsCOMPtr<nsIWeakReference> windowWeakRef = do_GetWeakReference(aWindow);
NS_ASSERTION(windowWeakRef, "nsIDOMWindow implementations shuld support weak ref");
if (mWindowListeners.IndexOf(windowWeakRef) !=
nsTArray<nsIDOMWindow*>::NoIndex) {
return NS_OK;
}
if (mWindowListeners.Length() == 0) {
RegisterSystemTimeChangeObserver(sObserver);
}
mWindowListeners.AppendElement(windowWeakRef);
return NS_OK;
}
nsresult
nsSystemTimeChangeObserver::RemoveWindowListener(nsIDOMWindow* aWindow)
{
if (!sObserver) {
return NS_OK;
}
return GetInstance()->RemoveWindowListenerImpl(aWindow);
}
nsresult
nsSystemTimeChangeObserver::RemoveWindowListenerImpl(nsIDOMWindow* aWindow)
{
mWindowListeners.RemoveElement(NS_GetWeakReference(aWindow));
if (mWindowListeners.Length() == 0) {
UnregisterSystemTimeChangeObserver(sObserver);
}
return NS_OK;
}