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680815cd6e
This patch was generated automatically by the "modeline.py" script, available here: https://github.com/amccreight/moz-source-tools/blob/master/modeline.py For every file that is modified in this patch, the changes are as follows: (1) The patch changes the file to use the exact C++ mode lines from the Mozilla coding style guide, available here: https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Coding_Style#Mode_Line (2) The patch deletes any blank lines between the mode line & the MPL boilerplate comment. (3) If the file previously had the mode lines and MPL boilerplate in a single contiguous C++ comment, then the patch splits them into separate C++ comments, to match the boilerplate in the coding style. MozReview-Commit-ID: EuRsDue63tK --HG-- extra : rebase_source : 3356d4b80ff6213935192e87cdbc9103fec6084c
99 lines
3.0 KiB
C++
99 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* implements DOM interface for querying and observing media queries */
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#ifndef mozilla_dom_MediaQueryList_h
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#define mozilla_dom_MediaQueryList_h
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#include "nsISupports.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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#include "mozilla/LinkedList.h"
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#include "mozilla/Attributes.h"
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#include "nsWrapperCache.h"
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#include "mozilla/DOMEventTargetHelper.h"
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#include "mozilla/dom/MediaQueryListBinding.h"
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class nsIDocument;
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namespace mozilla {
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namespace dom {
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class MediaList;
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class MediaQueryList final : public DOMEventTargetHelper,
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public mozilla::LinkedListElement<MediaQueryList>
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{
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public:
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// The caller who constructs is responsible for calling Evaluate
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// before calling any other methods.
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MediaQueryList(nsIDocument* aDocument,
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const nsAString& aMediaQueryList,
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mozilla::dom::CallerType aCallerType);
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private:
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~MediaQueryList();
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MediaQueryList, DOMEventTargetHelper)
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nsISupports* GetParentObject() const;
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void MaybeNotify();
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JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
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// WebIDL methods
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void GetMedia(nsAString& aMedia);
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bool Matches();
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void AddListener(EventListener* aListener, ErrorResult& aRv);
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void RemoveListener(EventListener* aListener, ErrorResult& aRv);
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using nsIDOMEventTarget::AddEventListener;
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virtual void AddEventListener(const nsAString& aType,
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EventListener* aCallback,
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const AddEventListenerOptionsOrBoolean& aOptions,
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const Nullable<bool>& aWantsUntrusted,
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ErrorResult& aRv) override;
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IMPL_EVENT_HANDLER(change)
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bool HasListeners();
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void Disconnect();
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private:
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void RecomputeMatches();
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// We only need a pointer to the document to support lazy
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// reevaluation following dynamic changes. However, this lazy
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// reevaluation is perhaps somewhat important, since some usage
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// patterns may involve the creation of large numbers of
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// MediaQueryList objects which almost immediately become garbage
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// (after a single call to the .matches getter).
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//
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// This pointer does make us a little more dependent on cycle
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// collection.
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//
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// We have a non-null mDocument for our entire lifetime except
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// after cycle collection unlinking. Having a non-null mDocument
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// is equivalent to being in that document's mDOMMediaQueryLists
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// linked list.
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nsCOMPtr<nsIDocument> mDocument;
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RefPtr<MediaList> mMediaList;
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bool mMatches;
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bool mMatchesValid;
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* !defined(mozilla_dom_MediaQueryList_h) */
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