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      1 /*
      2  * Copyright (C) 2011 Google Inc.  All rights reserved.
      3  * Copyright (C) 2011, 2012, 2013 Apple Inc. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "config.h"
     33 #include "core/html/track/TextTrackCue.h"
     34 
     35 #include "bindings/v8/ExceptionMessages.h"
     36 #include "bindings/v8/ExceptionStatePlaceholder.h"
     37 #include "core/events/Event.h"
     38 #include "core/html/track/TextTrack.h"
     39 #include "core/html/track/TextTrackCueList.h"
     40 
     41 namespace WebCore {
     42 
     43 static const int invalidCueIndex = -1;
     44 
     45 TextTrackCue::TextTrackCue(double start, double end)
     46     : m_startTime(start)
     47     , m_endTime(end)
     48     , m_cueIndex(invalidCueIndex)
     49     , m_track(nullptr)
     50     , m_isActive(false)
     51     , m_pauseOnExit(false)
     52 {
     53 }
     54 
     55 void TextTrackCue::cueWillChange()
     56 {
     57     if (m_track)
     58         m_track->cueWillChange(this);
     59 }
     60 
     61 void TextTrackCue::cueDidChange()
     62 {
     63     if (m_track)
     64         m_track->cueDidChange(this);
     65 }
     66 
     67 TextTrack* TextTrackCue::track() const
     68 {
     69     return m_track;
     70 }
     71 
     72 void TextTrackCue::setTrack(TextTrack* track)
     73 {
     74     m_track = track;
     75 }
     76 
     77 Node* TextTrackCue::owner() const
     78 {
     79     return m_track ? m_track->owner() : 0;
     80 }
     81 
     82 void TextTrackCue::setId(const AtomicString& id)
     83 {
     84     if (m_id == id)
     85         return;
     86 
     87     cueWillChange();
     88     m_id = id;
     89     cueDidChange();
     90 }
     91 
     92 void TextTrackCue::setStartTime(double value)
     93 {
     94     // TODO(93143): Add spec-compliant behavior for negative time values.
     95     if (m_startTime == value || value < 0)
     96         return;
     97 
     98     cueWillChange();
     99     m_startTime = value;
    100     cueDidChange();
    101 }
    102 
    103 void TextTrackCue::setEndTime(double value)
    104 {
    105     // TODO(93143): Add spec-compliant behavior for negative time values.
    106     if (m_endTime == value || value < 0)
    107         return;
    108 
    109     cueWillChange();
    110     m_endTime = value;
    111     cueDidChange();
    112 }
    113 
    114 void TextTrackCue::setPauseOnExit(bool value)
    115 {
    116     if (m_pauseOnExit == value)
    117         return;
    118 
    119     cueWillChange();
    120     m_pauseOnExit = value;
    121     cueDidChange();
    122 }
    123 
    124 int TextTrackCue::cueIndex()
    125 {
    126     if (m_cueIndex == invalidCueIndex)
    127         m_cueIndex = track()->cues()->getCueIndex(this);
    128 
    129     return m_cueIndex;
    130 }
    131 
    132 void TextTrackCue::invalidateCueIndex()
    133 {
    134     m_cueIndex = invalidCueIndex;
    135 }
    136 
    137 bool TextTrackCue::dispatchEvent(PassRefPtrWillBeRawPtr<Event> event)
    138 {
    139     // When a TextTrack's mode is disabled: no cues are active, no events fired.
    140     if (!track() || track()->mode() == TextTrack::disabledKeyword())
    141         return false;
    142 
    143     return EventTarget::dispatchEvent(event);
    144 }
    145 
    146 bool TextTrackCue::isActive()
    147 {
    148     return m_isActive && track() && track()->mode() != TextTrack::disabledKeyword();
    149 }
    150 
    151 void TextTrackCue::setIsActive(bool active)
    152 {
    153     m_isActive = active;
    154 
    155     // Remove the display tree as soon as the cue becomes inactive.
    156     if (!active)
    157         removeDisplayTree();
    158 }
    159 
    160 const AtomicString& TextTrackCue::interfaceName() const
    161 {
    162     return EventTargetNames::TextTrackCue;
    163 }
    164 
    165 void TextTrackCue::trace(Visitor* visitor)
    166 {
    167     visitor->trace(m_track);
    168     EventTargetWithInlineData::trace(visitor);
    169 }
    170 
    171 } // namespace WebCore
    172