gecko-dev/dom/html/TextTrackManager.h

128 строки
4.7 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set tw=80 expandtab softtabstop=2 ts=2 sw=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_TextTrackManager_h
#define mozilla_dom_TextTrackManager_h
#include "mozilla/dom/TextTrack.h"
#include "mozilla/dom/TextTrackList.h"
#include "mozilla/dom/TextTrackCueList.h"
#include "mozilla/StaticPtr.h"
class nsIWebVTTParserWrapper;
namespace mozilla {
namespace dom {
class HTMLMediaElement;
class CompareTextTracks {
private:
HTMLMediaElement* mMediaElement;
public:
explicit CompareTextTracks(HTMLMediaElement* aMediaElement);
int32_t TrackChildPosition(TextTrack* aTrack) const;
bool Equals(TextTrack* aOne, TextTrack* aTwo) const;
bool LessThan(TextTrack* aOne, TextTrack* aTwo) const;
};
class TextTrack;
class TextTrackCue;
class TextTrackManager final : public nsIDOMEventListener
{
~TextTrackManager();
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(TextTrackManager)
NS_DECL_NSIDOMEVENTLISTENER
explicit TextTrackManager(HTMLMediaElement* aMediaElement);
TextTrackList* GetTextTracks() const;
already_AddRefed<TextTrack> AddTextTrack(TextTrackKind aKind,
const nsAString& aLabel,
const nsAString& aLanguage,
TextTrackMode aMode,
TextTrackReadyState aReadyState,
TextTrackSource aTextTrackSource);
void AddTextTrack(TextTrack* aTextTrack);
void RemoveTextTrack(TextTrack* aTextTrack, bool aPendingListOnly);
void DidSeek();
void AddCue(TextTrackCue& aCue);
void AddCues(TextTrack* aTextTrack);
/**
* Overview of WebVTT cuetext and anonymous content setup.
*
* WebVTT nodes are the parsed version of WebVTT cuetext. WebVTT cuetext is
* the portion of a WebVTT cue that specifies what the caption will actually
* show up as on screen.
*
* WebVTT cuetext can contain markup that loosely relates to HTML markup. It
* can contain tags like <b>, <u>, <i>, <c>, <v>, <ruby>, <rt>, <lang>,
* including timestamp tags.
*
* When the caption is ready to be displayed the WebVTT nodes are converted
* over to anonymous DOM content. <i>, <u>, <b>, <ruby>, and <rt> all become
* HTMLElements of their corresponding HTML markup tags. <c> and <v> are
* converted to <span> tags. Timestamp tags are converted to XML processing
* instructions. Additionally, all cuetext tags support specifying of classes.
* This takes the form of <foo.class.subclass>. These classes are then parsed
* and set as the anonymous content's class attribute.
*
* Rules on constructing DOM objects from WebVTT nodes can be found here
* http://dev.w3.org/html5/webvtt/#webvtt-cue-text-dom-construction-rules.
* Current rules are taken from revision on April 15, 2013.
*/
/**
* Converts the TextTrackCue's cuetext into a tree of DOM objects and attaches
* it to a div on it's owning TrackElement's MediaElement's caption overlay.
*/
void UpdateCueDisplay();
void PopulatePendingList();
void AddListeners();
// The HTMLMediaElement that this TextTrackManager manages the TextTracks of.
nsRefPtr<HTMLMediaElement> mMediaElement;
private:
// List of the TextTrackManager's owning HTMLMediaElement's TextTracks.
nsRefPtr<TextTrackList> mTextTracks;
// List of text track objects awaiting loading.
nsRefPtr<TextTrackList> mPendingTextTracks;
// List of newly introduced Text Track cues.
nsRefPtr<TextTrackCueList> mNewCues;
static StaticRefPtr<nsIWebVTTParserWrapper> sParserWrapper;
bool performedTrackSelection;
// Runs the algorithm for performing automatic track selection.
void HonorUserPreferencesForTrackSelection();
// Performs track selection for a single TextTrackKind.
void PerformTrackSelection(TextTrackKind aTextTrackKind);
//Performs track selection for a set of TextTrackKinds, for example,
// 'subtitles' and 'captions' should be selected together.
void PerformTrackSelection(TextTrackKind aTextTrackKinds[], uint32_t size);
void GetTextTracksOfKinds(TextTrackKind aTextTrackKinds[], uint32_t size,
nsTArray<TextTrack*>& aTextTracks);
void GetTextTracksOfKind(TextTrackKind aTextTrackKind,
nsTArray<TextTrack*>& aTextTracks);
bool TrackIsDefault(TextTrack* aTextTrack);
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_TextTrackManager_h