Source/core/html/shadow/MediaControlElements.cpp

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
m_transitionTimer
create
shadowPseudoId
defaultEventHandler
startTimer
stopTimer
transitionTimerFired
makeOpaque
makeTransparent
setIsDisplayed
create
shadowPseudoId
create
shadowPseudoId
create
defaultEventHandler
updateDisplayType
shadowPseudoId
create
defaultEventHandler
updateDisplayType
shadowPseudoId
create
updateDisplayType
shadowPseudoId
create
updateDisplayType
defaultEventHandler
shadowPseudoId
create
defaultEventHandler
willRespondToMouseClickEvents
setPosition
setDuration
shadowPseudoId
create
defaultEventHandler
willRespondToMouseMoveEvents
willRespondToMouseClickEvents
setVolume
shadowPseudoId
create
defaultEventHandler
shadowPseudoId
setIsFullscreen
create
getMediaControlTimeRemainingDisplayElementShadowPseudoId
shadowPseudoId
create
getMediaControlCurrentTimeDisplayElementShadowPseudoId
shadowPseudoId
m_fontSize
create
createRenderer
textTrackContainerElementShadowPseudoId
shadowPseudoId
updateDisplay
updateSizes
/*
 * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "core/html/shadow/MediaControlElements.h"

#include "RuntimeEnabledFeatures.h"
#include "bindings/v8/ExceptionStatePlaceholder.h"
#include "core/dom/DOMTokenList.h"
#include "core/dom/FullscreenElementStack.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/events/MouseEvent.h"
#include "core/frame/LocalFrame.h"
#include "core/html/HTMLVideoElement.h"
#include "core/html/MediaController.h"
#include "core/html/shadow/MediaControls.h"
#include "core/html/track/TextTrack.h"
#include "core/html/track/vtt/VTTRegionList.h"
#include "core/page/EventHandler.h"
#include "core/rendering/RenderMediaControlElements.h"
#include "core/rendering/RenderSlider.h"
#include "core/rendering/RenderTheme.h"
#include "core/rendering/RenderVideo.h"

namespace WebCore {

using namespace HTMLNames;

static const AtomicString& getMediaControlCurrentTimeDisplayElementShadowPseudoId();
static const AtomicString& getMediaControlTimeRemainingDisplayElementShadowPseudoId();

static const double fadeInDuration = 0.1;
static const double fadeOutDuration = 0.3;

MediaControlPanelElement::MediaControlPanelElement(MediaControls& mediaControls)
    : MediaControlDivElement(mediaControls, MediaControlsPanel)
    , m_isDisplayed(false)
    , m_opaque(true)
    , m_transitionTimer(this, &MediaControlPanelElement::transitionTimerFired)
{
}

PassRefPtr<MediaControlPanelElement> MediaControlPanelElement::create(MediaControls& mediaControls)
{
    return adoptRef(new MediaControlPanelElement(mediaControls));
}

const AtomicString& MediaControlPanelElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-panel", AtomicString::ConstructFromLiteral));
    return id;
}

void MediaControlPanelElement::defaultEventHandler(Event* event)
{
    // Suppress the media element activation behavior (toggle play/pause) when
    // any part of the control panel is clicked.
    if (event->type() == EventTypeNames::click) {
        event->setDefaultHandled();
        return;
    }
    HTMLDivElement::defaultEventHandler(event);
}

void MediaControlPanelElement::startTimer()
{
    stopTimer();

    // The timer is required to set the property display:'none' on the panel,
    // such that captions are correctly displayed at the bottom of the video
    // at the end of the fadeout transition.
    // FIXME: Racing a transition with a setTimeout like this is wrong.
    m_transitionTimer.startOneShot(fadeOutDuration, FROM_HERE);
}

void MediaControlPanelElement::stopTimer()
{
    if (m_transitionTimer.isActive())
        m_transitionTimer.stop();
}

void MediaControlPanelElement::transitionTimerFired(Timer<MediaControlPanelElement>*)
{
    if (!m_opaque)
        hide();

    stopTimer();
}

void MediaControlPanelElement::makeOpaque()
{
    if (m_opaque)
        return;

    setInlineStyleProperty(CSSPropertyTransitionProperty, CSSPropertyOpacity);
    setInlineStyleProperty(CSSPropertyTransitionDuration, fadeInDuration, CSSPrimitiveValue::CSS_S);
    setInlineStyleProperty(CSSPropertyOpacity, 1.0, CSSPrimitiveValue::CSS_NUMBER);

    m_opaque = true;

    if (m_isDisplayed)
        show();
}

void MediaControlPanelElement::makeTransparent()
{
    if (!m_opaque)
        return;

    setInlineStyleProperty(CSSPropertyTransitionProperty, CSSPropertyOpacity);
    setInlineStyleProperty(CSSPropertyTransitionDuration, fadeOutDuration, CSSPrimitiveValue::CSS_S);
    setInlineStyleProperty(CSSPropertyOpacity, 0.0, CSSPrimitiveValue::CSS_NUMBER);

    m_opaque = false;
    startTimer();
}

void MediaControlPanelElement::setIsDisplayed(bool isDisplayed)
{
    m_isDisplayed = isDisplayed;
}

// ----------------------------

MediaControlPanelEnclosureElement::MediaControlPanelEnclosureElement(MediaControls& mediaControls)
    // Mapping onto same MediaControlElementType as panel element, since it has similar properties.
    : MediaControlDivElement(mediaControls, MediaControlsPanel)
{
}

PassRefPtr<MediaControlPanelEnclosureElement> MediaControlPanelEnclosureElement::create(MediaControls& mediaControls)
{
    return adoptRef(new MediaControlPanelEnclosureElement(mediaControls));
}

const AtomicString& MediaControlPanelEnclosureElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-enclosure", AtomicString::ConstructFromLiteral));
    return id;
}

// ----------------------------

MediaControlOverlayEnclosureElement::MediaControlOverlayEnclosureElement(MediaControls& mediaControls)
    // Mapping onto same MediaControlElementType as panel element, since it has similar properties.
    : MediaControlDivElement(mediaControls, MediaControlsPanel)
{
}

PassRefPtr<MediaControlOverlayEnclosureElement> MediaControlOverlayEnclosureElement::create(MediaControls& mediaControls)
{
    return adoptRef(new MediaControlOverlayEnclosureElement(mediaControls));
}

const AtomicString& MediaControlOverlayEnclosureElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-overlay-enclosure", AtomicString::ConstructFromLiteral));
    return id;
}

// ----------------------------

MediaControlMuteButtonElement::MediaControlMuteButtonElement(MediaControls& mediaControls)
    : MediaControlInputElement(mediaControls, MediaMuteButton)
{
}

PassRefPtr<MediaControlMuteButtonElement> MediaControlMuteButtonElement::create(MediaControls& mediaControls)
{
    RefPtr<MediaControlMuteButtonElement> button = adoptRef(new MediaControlMuteButtonElement(mediaControls));
    button->ensureUserAgentShadowRoot();
    button->setType("button");
    return button.release();
}

void MediaControlMuteButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == EventTypeNames::click) {
        mediaElement().setMuted(!mediaElement().muted());
        event->setDefaultHandled();
    }

    HTMLInputElement::defaultEventHandler(event);
}

void MediaControlMuteButtonElement::updateDisplayType()
{
    setDisplayType(mediaElement().muted() ? MediaUnMuteButton : MediaMuteButton);
}

const AtomicString& MediaControlMuteButtonElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-mute-button", AtomicString::ConstructFromLiteral));
    return id;
}

// ----------------------------

MediaControlPlayButtonElement::MediaControlPlayButtonElement(MediaControls& mediaControls)
    : MediaControlInputElement(mediaControls, MediaPlayButton)
{
}

PassRefPtr<MediaControlPlayButtonElement> MediaControlPlayButtonElement::create(MediaControls& mediaControls)
{
    RefPtr<MediaControlPlayButtonElement> button = adoptRef(new MediaControlPlayButtonElement(mediaControls));
    button->ensureUserAgentShadowRoot();
    button->setType("button");
    return button.release();
}

void MediaControlPlayButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == EventTypeNames::click) {
        mediaElement().togglePlayState();
        updateDisplayType();
        event->setDefaultHandled();
    }
    HTMLInputElement::defaultEventHandler(event);
}

void MediaControlPlayButtonElement::updateDisplayType()
{
    setDisplayType(mediaElement().togglePlayStateWillPlay() ? MediaPlayButton : MediaPauseButton);
}

const AtomicString& MediaControlPlayButtonElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-play-button", AtomicString::ConstructFromLiteral));
    return id;
}

// ----------------------------

MediaControlOverlayPlayButtonElement::MediaControlOverlayPlayButtonElement(MediaControls& mediaControls)
    : MediaControlInputElement(mediaControls, MediaOverlayPlayButton)
{
}

PassRefPtr<MediaControlOverlayPlayButtonElement> MediaControlOverlayPlayButtonElement::create(MediaControls& mediaControls)
{
    RefPtr<MediaControlOverlayPlayButtonElement> button = adoptRef(new MediaControlOverlayPlayButtonElement(mediaControls));
    button->ensureUserAgentShadowRoot();
    button->setType("button");
    return button.release();
}

void MediaControlOverlayPlayButtonElement::updateDisplayType()
{
    if (mediaElement().togglePlayStateWillPlay()) {
        show();
    } else
        hide();
}

const AtomicString& MediaControlOverlayPlayButtonElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-overlay-play-button", AtomicString::ConstructFromLiteral));
    return id;
}


// ----------------------------

MediaControlToggleClosedCaptionsButtonElement::MediaControlToggleClosedCaptionsButtonElement(MediaControls& mediaControls)
    : MediaControlInputElement(mediaControls, MediaShowClosedCaptionsButton)
{
}

PassRefPtr<MediaControlToggleClosedCaptionsButtonElement> MediaControlToggleClosedCaptionsButtonElement::create(MediaControls& mediaControls)
{
    RefPtr<MediaControlToggleClosedCaptionsButtonElement> button = adoptRef(new MediaControlToggleClosedCaptionsButtonElement(mediaControls));
    button->ensureUserAgentShadowRoot();
    button->setType("button");
    button->hide();
    return button.release();
}

void MediaControlToggleClosedCaptionsButtonElement::updateDisplayType()
{
    bool captionsVisible = mediaElement().closedCaptionsVisible();
    setDisplayType(captionsVisible ? MediaHideClosedCaptionsButton : MediaShowClosedCaptionsButton);
    setChecked(captionsVisible);
}

void MediaControlToggleClosedCaptionsButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == EventTypeNames::click) {
        mediaElement().setClosedCaptionsVisible(!mediaElement().closedCaptionsVisible());
        setChecked(mediaElement().closedCaptionsVisible());
        updateDisplayType();
        event->setDefaultHandled();
    }

    HTMLInputElement::defaultEventHandler(event);
}

const AtomicString& MediaControlToggleClosedCaptionsButtonElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-toggle-closed-captions-button", AtomicString::ConstructFromLiteral));
    return id;
}

// ----------------------------

MediaControlTimelineElement::MediaControlTimelineElement(MediaControls& mediaControls)
    : MediaControlInputElement(mediaControls, MediaSlider)
{
}

PassRefPtr<MediaControlTimelineElement> MediaControlTimelineElement::create(MediaControls& mediaControls)
{
    RefPtr<MediaControlTimelineElement> timeline = adoptRef(new MediaControlTimelineElement(mediaControls));
    timeline->ensureUserAgentShadowRoot();
    timeline->setType("range");
    timeline->setAttribute(stepAttr, "any");
    return timeline.release();
}

void MediaControlTimelineElement::defaultEventHandler(Event* event)
{
    if (event->isMouseEvent() && toMouseEvent(event)->button() != LeftButton)
        return;

    if (!inDocument() || !document().isActive())
        return;

    if (event->type() == EventTypeNames::mousedown)
        mediaControls().beginScrubbing();

    if (event->type() == EventTypeNames::mouseup)
        mediaControls().endScrubbing();

    MediaControlInputElement::defaultEventHandler(event);

    if (event->type() == EventTypeNames::mouseover || event->type() == EventTypeNames::mouseout || event->type() == EventTypeNames::mousemove)
        return;

    double time = value().toDouble();
    if (event->type() == EventTypeNames::input) {
        // FIXME: This will need to take the timeline offset into consideration
        // once that concept is supported, see https://crbug.com/312699
        if (mediaElement().controller())
            mediaElement().controller()->setCurrentTime(time, IGNORE_EXCEPTION);
        else
            mediaElement().setCurrentTime(time, IGNORE_EXCEPTION);
    }

    RenderSlider* slider = toRenderSlider(renderer());
    if (slider && slider->inDragMode())
        mediaControls().updateCurrentTimeDisplay();
}

bool MediaControlTimelineElement::willRespondToMouseClickEvents()
{
    return inDocument() && document().isActive();
}

void MediaControlTimelineElement::setPosition(double currentTime)
{
    setValue(String::number(currentTime));
}

void MediaControlTimelineElement::setDuration(double duration)
{
    setFloatingPointAttribute(maxAttr, std::isfinite(duration) ? duration : 0);
}


const AtomicString& MediaControlTimelineElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-timeline", AtomicString::ConstructFromLiteral));
    return id;
}

// ----------------------------

MediaControlVolumeSliderElement::MediaControlVolumeSliderElement(MediaControls& mediaControls)
    : MediaControlInputElement(mediaControls, MediaVolumeSlider)
{
}

PassRefPtr<MediaControlVolumeSliderElement> MediaControlVolumeSliderElement::create(MediaControls& mediaControls)
{
    RefPtr<MediaControlVolumeSliderElement> slider = adoptRef(new MediaControlVolumeSliderElement(mediaControls));
    slider->ensureUserAgentShadowRoot();
    slider->setType("range");
    slider->setAttribute(stepAttr, "any");
    slider->setAttribute(maxAttr, "1");
    return slider.release();
}

void MediaControlVolumeSliderElement::defaultEventHandler(Event* event)
{
    if (event->isMouseEvent() && toMouseEvent(event)->button() != LeftButton)
        return;

    if (!inDocument() || !document().isActive())
        return;

    MediaControlInputElement::defaultEventHandler(event);

    if (event->type() == EventTypeNames::mouseover || event->type() == EventTypeNames::mouseout || event->type() == EventTypeNames::mousemove)
        return;

    double volume = value().toDouble();
    mediaElement().setVolume(volume, ASSERT_NO_EXCEPTION);
    mediaElement().setMuted(false);
}

bool MediaControlVolumeSliderElement::willRespondToMouseMoveEvents()
{
    if (!inDocument() || !document().isActive())
        return false;

    return MediaControlInputElement::willRespondToMouseMoveEvents();
}

bool MediaControlVolumeSliderElement::willRespondToMouseClickEvents()
{
    if (!inDocument() || !document().isActive())
        return false;

    return MediaControlInputElement::willRespondToMouseClickEvents();
}

void MediaControlVolumeSliderElement::setVolume(double volume)
{
    if (value().toDouble() != volume)
        setValue(String::number(volume));
}

const AtomicString& MediaControlVolumeSliderElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-volume-slider", AtomicString::ConstructFromLiteral));
    return id;
}

// ----------------------------

MediaControlFullscreenButtonElement::MediaControlFullscreenButtonElement(MediaControls& mediaControls)
    : MediaControlInputElement(mediaControls, MediaEnterFullscreenButton)
{
}

PassRefPtr<MediaControlFullscreenButtonElement> MediaControlFullscreenButtonElement::create(MediaControls& mediaControls)
{
    RefPtr<MediaControlFullscreenButtonElement> button = adoptRef(new MediaControlFullscreenButtonElement(mediaControls));
    button->ensureUserAgentShadowRoot();
    button->setType("button");
    button->hide();
    return button.release();
}

void MediaControlFullscreenButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == EventTypeNames::click) {
        if (FullscreenElementStack::isActiveFullScreenElement(&mediaElement()))
            FullscreenElementStack::from(document()).webkitCancelFullScreen();
        else
            FullscreenElementStack::from(document()).requestFullScreenForElement(&mediaElement(), 0, FullscreenElementStack::ExemptIFrameAllowFullScreenRequirement);
        event->setDefaultHandled();
    }
    HTMLInputElement::defaultEventHandler(event);
}

const AtomicString& MediaControlFullscreenButtonElement::shadowPseudoId() const
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-fullscreen-button", AtomicString::ConstructFromLiteral));
    return id;
}

void MediaControlFullscreenButtonElement::setIsFullscreen(bool isFullscreen)
{
    setDisplayType(isFullscreen ? MediaExitFullscreenButton : MediaEnterFullscreenButton);
}

// ----------------------------

MediaControlTimeRemainingDisplayElement::MediaControlTimeRemainingDisplayElement(MediaControls& mediaControls)
    : MediaControlTimeDisplayElement(mediaControls, MediaTimeRemainingDisplay)
{
}

PassRefPtr<MediaControlTimeRemainingDisplayElement> MediaControlTimeRemainingDisplayElement::create(MediaControls& mediaControls)
{
    return adoptRef(new MediaControlTimeRemainingDisplayElement(mediaControls));
}

static const AtomicString& getMediaControlTimeRemainingDisplayElementShadowPseudoId()
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-time-remaining-display", AtomicString::ConstructFromLiteral));
    return id;
}

const AtomicString& MediaControlTimeRemainingDisplayElement::shadowPseudoId() const
{
    return getMediaControlTimeRemainingDisplayElementShadowPseudoId();
}

// ----------------------------

MediaControlCurrentTimeDisplayElement::MediaControlCurrentTimeDisplayElement(MediaControls& mediaControls)
    : MediaControlTimeDisplayElement(mediaControls, MediaCurrentTimeDisplay)
{
}

PassRefPtr<MediaControlCurrentTimeDisplayElement> MediaControlCurrentTimeDisplayElement::create(MediaControls& mediaControls)
{
    return adoptRef(new MediaControlCurrentTimeDisplayElement(mediaControls));
}

static const AtomicString& getMediaControlCurrentTimeDisplayElementShadowPseudoId()
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-controls-current-time-display", AtomicString::ConstructFromLiteral));
    return id;
}

const AtomicString& MediaControlCurrentTimeDisplayElement::shadowPseudoId() const
{
    return getMediaControlCurrentTimeDisplayElementShadowPseudoId();
}

// ----------------------------

MediaControlTextTrackContainerElement::MediaControlTextTrackContainerElement(MediaControls& mediaControls)
    : MediaControlDivElement(mediaControls, MediaTextTrackDisplayContainer)
    , m_fontSize(0)
{
}

PassRefPtr<MediaControlTextTrackContainerElement> MediaControlTextTrackContainerElement::create(MediaControls& mediaControls)
{
    RefPtr<MediaControlTextTrackContainerElement> element = adoptRef(new MediaControlTextTrackContainerElement(mediaControls));
    element->hide();
    return element.release();
}

RenderObject* MediaControlTextTrackContainerElement::createRenderer(RenderStyle*)
{
    return new RenderTextTrackContainerElement(this);
}

const AtomicString& MediaControlTextTrackContainerElement::textTrackContainerElementShadowPseudoId()
{
    DEFINE_STATIC_LOCAL(AtomicString, id, ("-webkit-media-text-track-container", AtomicString::ConstructFromLiteral));
    return id;
}

const AtomicString& MediaControlTextTrackContainerElement::shadowPseudoId() const
{
    return textTrackContainerElementShadowPseudoId();
}

void MediaControlTextTrackContainerElement::updateDisplay()
{
    if (!mediaElement().closedCaptionsVisible()) {
        removeChildren();
        return;
    }

    // 1. If the media element is an audio element, or is another playback
    // mechanism with no rendering area, abort these steps. There is nothing to
    // render.
    if (isHTMLAudioElement(mediaElement()))
        return;

    // 2. Let video be the media element or other playback mechanism.
    HTMLVideoElement& video = toHTMLVideoElement(mediaElement());

    // 3. Let output be an empty list of absolutely positioned CSS block boxes.
    Vector<RefPtr<HTMLDivElement> > output;

    // 4. If the user agent is exposing a user interface for video, add to
    // output one or more completely transparent positioned CSS block boxes that
    // cover the same region as the user interface.

    // 5. If the last time these rules were run, the user agent was not exposing
    // a user interface for video, but now it is, let reset be true. Otherwise,
    // let reset be false.

    // There is nothing to be done explicitly for 4th and 5th steps, as
    // everything is handled through CSS. The caption box is on top of the
    // controls box, in a container set with the -webkit-box display property.

    // 6. Let tracks be the subset of video's list of text tracks that have as
    // their rules for updating the text track rendering these rules for
    // updating the display of WebVTT text tracks, and whose text track mode is
    // showing or showing by default.
    // 7. Let cues be an empty list of text track cues.
    // 8. For each track track in tracks, append to cues all the cues from
    // track's list of cues that have their text track cue active flag set.
    CueList activeCues = video.currentlyActiveCues();

    // 9. If reset is false, then, for each text track cue cue in cues: if cue's
    // text track cue display state has a set of CSS boxes, then add those boxes
    // to output, and remove cue from cues.

    // There is nothing explicitly to be done here, as all the caching occurs
    // within the TextTrackCue instance itself. If parameters of the cue change,
    // the display tree is cleared.

    // 10. For each text track cue cue in cues that has not yet had
    // corresponding CSS boxes added to output, in text track cue order, run the
    // following substeps:
    for (size_t i = 0; i < activeCues.size(); ++i) {
        TextTrackCue* cue = activeCues[i].data();

        ASSERT(cue->isActive());
        if (!cue->track() || !cue->track()->isRendered() || !cue->isActive())
            continue;

        cue->updateDisplay(m_videoDisplaySize.size(), *this);
    }

    // 11. Return output.
    if (hasChildren())
        show();
    else
        hide();
}

void MediaControlTextTrackContainerElement::updateSizes()
{
    if (!document().isActive())
        return;

    IntRect videoBox;

    if (!mediaElement().renderer() || !mediaElement().renderer()->isVideo())
        return;
    videoBox = toRenderVideo(mediaElement().renderer())->videoBox();

    if (m_videoDisplaySize == videoBox)
        return;
    m_videoDisplaySize = videoBox;

    float smallestDimension = std::min(m_videoDisplaySize.size().height(), m_videoDisplaySize.size().width());

    float fontSize = smallestDimension * 0.05f;
    if (fontSize != m_fontSize) {
        m_fontSize = fontSize;
        setInlineStyleProperty(CSSPropertyFontSize, fontSize, CSSPrimitiveValue::CSS_PX);
    }
}

// ----------------------------

} // namespace WebCore
/* [<][>][^][v][top][bottom][index][help] */
root/Source/core/html/shadow/MediaControlElements.cpp

DEFINITIONS
