TextTrackCue.h   [plain text]

/*
 * Copyright (C) 2011 Google Inc.  All rights reserved.
 * Copyright (C) 2012, 2013, 2014 Apple Inc.  All rights reserved.
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 * this software without specific prior written permission.
 *
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 */

#ifndef TextTrackCue_h
#define TextTrackCue_h

#if ENABLE(VIDEO_TRACK)

#include "EventTarget.h"
#include "HTMLElement.h"
#include <wtf/MediaTime.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/RefCounted.h>

namespace WebCore {

class TextTrack;

class TextTrackCue : public RefCounted<TextTrackCue>, public EventTargetWithInlineData {
public:
    static Ref<TextTrackCue> create(ScriptExecutionContext&, double start, double end, const String& content);
    static Ref<TextTrackCue> create(ScriptExecutionContext&, const MediaTime& start, const MediaTime& end, const String& content);

    static const AtomicString& cueShadowPseudoId()
    {
        static NeverDestroyed<const AtomicString> cue("cue", AtomicString::ConstructFromLiteral);
        return cue;
    }

    virtual ~TextTrackCue();

    TextTrack* track() const;
    void setTrack(TextTrack*);

    const String& id() const { return m_id; }
    void setId(const String&);

    MediaTime startMediaTime() const { return m_startTime; }
    double startTime() const { return startMediaTime().toDouble(); }
    void setStartTime(const MediaTime&);
    void setStartTime(double, ExceptionCode&);

    MediaTime endMediaTime() const { return m_endTime; }
    double endTime() const { return endMediaTime().toDouble(); }
    void setEndTime(const MediaTime&);
    void setEndTime(double, ExceptionCode&);

    bool pauseOnExit() const { return m_pauseOnExit; }
    void setPauseOnExit(bool);

    int cueIndex();
    void invalidateCueIndex();

    using EventTarget::dispatchEvent;
    bool dispatchEvent(Event&) override;

    bool isActive();
    virtual void setIsActive(bool);

    EventTargetInterface eventTargetInterface() const final { return TextTrackCueEventTargetInterfaceType; }
    ScriptExecutionContext* scriptExecutionContext() const final { return &m_scriptExecutionContext; }

    virtual bool isOrderedBefore(const TextTrackCue*) const;
    virtual bool isPositionedAbove(const TextTrackCue* cue) const { return isOrderedBefore(cue); }

    bool hasEquivalentStartTime(const TextTrackCue&) const;

    enum CueType {
        Data,
        Generic,
        WebVTT
    };
    virtual CueType cueType() const = 0;
    virtual bool isRenderable() const { return false; }

    enum CueMatchRules {
        MatchAllFields,
        IgnoreDuration,
    };
    virtual bool isEqual(const TextTrackCue&, CueMatchRules) const;
    virtual bool cueContentsMatch(const TextTrackCue&) const;
    virtual bool doesExtendCue(const TextTrackCue&) const;

    void willChange();
    virtual void didChange();

    using RefCounted<TextTrackCue>::ref;
    using RefCounted<TextTrackCue>::deref;

protected:
    TextTrackCue(ScriptExecutionContext&, const MediaTime& start, const MediaTime& end);

    Document& ownerDocument() { return downcast<Document>(m_scriptExecutionContext); }

private:

    void refEventTarget() final { ref(); }
    void derefEventTarget() final { deref(); }

    String m_id;
    MediaTime m_startTime;
    MediaTime m_endTime;
    int m_cueIndex;
    int m_processingCueChanges;

    TextTrack* m_track;

    ScriptExecutionContext& m_scriptExecutionContext;

    bool m_isActive : 1;
    bool m_pauseOnExit : 1;
};

} // namespace WebCore

#endif
#endif