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/* -*- Mode: C++; tab-width: 8; 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/. */
#ifndef mozilla_dom_power_WakeLock_h
#define mozilla_dom_power_WakeLock_h
#include "nsCOMPtr.h"
#include "nsIDOMEventListener.h"
#include "nsIObserver.h"
#include "nsString.h"
#include "nsWeakReference.h"
#include "nsWrapperCache.h"
#include "mozilla/ErrorResult.h"
class nsPIDOMWindowInner;
namespace mozilla {
namespace dom {
class ContentParent;
class WakeLock final
: public nsIDOMEventListener
, public nsWrapperCache
, public nsIObserver
, public nsSupportsWeakReference
{
public:
NS_DECL_NSIDOMEVENTLISTENER
NS_DECL_NSIOBSERVER
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(WakeLock, nsIDOMEventListener)
// Note: WakeLock lives for the lifetime of the document in order to avoid
// exposing GC behavior to pages. This means that
// |var foo = navigator.requestWakeLock('cpu'); foo = null;|
// doesn't unlock the 'cpu' resource.
WakeLock();
// Initialize this wake lock on behalf of the given window. Null windows are
// allowed; a lock without an associated window is always considered
// invisible.
nsresult Init(const nsAString &aTopic, nsPIDOMWindowInner* aWindow);
// Initialize this wake lock on behalf of the given process. If the process
// dies, the lock is released. A wake lock initialized via this method is
// always considered visible.
nsresult Init(const nsAString &aTopic, ContentParent* aContentParent);
// WebIDL methods
nsPIDOMWindowInner* GetParentObject() const;
virtual JSObject*
WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
void GetTopic(nsAString& aTopic);
void Unlock(ErrorResult& aRv);
private:
virtual ~WakeLock();
void DoUnlock();
void DoLock();
void AttachEventListener();
void DetachEventListener();
bool mLocked;
bool mHidden;
// The ID of the ContentParent on behalf of whom we acquired this lock, or
// CONTENT_PROCESS_UNKNOWN_ID if this lock was acquired on behalf of the
// current process.
uint64_t mContentParentID;
nsString mTopic;
// window that this was created for. Weak reference.
nsWeakPtr mWindow;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_power_WakeLock_h
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