105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
/* -*- 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/. */
|
|
|
|
/* implements DOM interface for querying and observing media queries */
|
|
|
|
#ifndef mozilla_dom_MediaQueryList_h
|
|
#define mozilla_dom_MediaQueryList_h
|
|
|
|
#include "nsISupports.h"
|
|
#include "nsCycleCollectionParticipant.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsTArray.h"
|
|
#include "prclist.h"
|
|
#include "mozilla/Attributes.h"
|
|
#include "nsWrapperCache.h"
|
|
#include "mozilla/DOMEventTargetHelper.h"
|
|
#include "mozilla/dom/MediaQueryListBinding.h"
|
|
|
|
class nsIDocument;
|
|
class nsMediaList;
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
|
|
class MediaQueryList final : public DOMEventTargetHelper,
|
|
public PRCList
|
|
{
|
|
public:
|
|
// The caller who constructs is responsible for calling Evaluate
|
|
// before calling any other methods.
|
|
MediaQueryList(nsIDocument *aDocument,
|
|
const nsAString &aMediaQueryList);
|
|
private:
|
|
~MediaQueryList();
|
|
|
|
public:
|
|
NS_DECL_ISUPPORTS_INHERITED
|
|
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MediaQueryList, DOMEventTargetHelper)
|
|
|
|
nsISupports* GetParentObject() const;
|
|
|
|
void MaybeNotify();
|
|
|
|
JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
|
|
|
|
// WebIDL methods
|
|
void GetMedia(nsAString& aMedia);
|
|
bool Matches();
|
|
void AddListener(EventListener* aListener, ErrorResult& aRv);
|
|
void RemoveListener(EventListener* aListener, ErrorResult& aRv);
|
|
|
|
EventHandlerNonNull* GetOnchange();
|
|
void SetOnchange(EventHandlerNonNull* aCallback);
|
|
|
|
using nsIDOMEventTarget::AddEventListener;
|
|
using nsIDOMEventTarget::RemoveEventListener;
|
|
|
|
virtual void AddEventListener(const nsAString& aType,
|
|
EventListener* aCallback,
|
|
const AddEventListenerOptionsOrBoolean& aOptions,
|
|
const Nullable<bool>& aWantsUntrusted,
|
|
ErrorResult& aRv) override;
|
|
virtual void RemoveEventListener(const nsAString& aType,
|
|
EventListener* aCallback,
|
|
const EventListenerOptionsOrBoolean& aOptions,
|
|
ErrorResult& aRv) override;
|
|
|
|
bool HasListeners();
|
|
|
|
void Disconnect();
|
|
|
|
private:
|
|
void RecomputeMatches();
|
|
|
|
void UpdateMustKeepAlive();
|
|
|
|
// We only need a pointer to the document to support lazy
|
|
// reevaluation following dynamic changes. However, this lazy
|
|
// reevaluation is perhaps somewhat important, since some usage
|
|
// patterns may involve the creation of large numbers of
|
|
// MediaQueryList objects which almost immediately become garbage
|
|
// (after a single call to the .matches getter).
|
|
//
|
|
// This pointer does make us a little more dependent on cycle
|
|
// collection.
|
|
//
|
|
// We have a non-null mDocument for our entire lifetime except
|
|
// after cycle collection unlinking. Having a non-null mDocument
|
|
// is equivalent to being in that document's mDOMMediaQueryLists
|
|
// linked list.
|
|
nsCOMPtr<nsIDocument> mDocument;
|
|
|
|
RefPtr<nsMediaList> mMediaList;
|
|
bool mMatches;
|
|
bool mMatchesValid;
|
|
bool mIsKeptAlive;
|
|
};
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif /* !defined(mozilla_dom_MediaQueryList_h) */
|