WebCore/rendering/MediaControlElements.cpp

/*
 * Copyright (C) 2008, 2009 Apple 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"

#if ENABLE(VIDEO)

#include "MediaControlElements.h"

#include "EventNames.h"
#include "FloatConversion.h"
#include "Frame.h"
#include "HTMLNames.h"
#include "LocalizedStrings.h"
#include "MouseEvent.h"
#include "Page.h"
#include "RenderMedia.h"
#include "RenderSlider.h"
#include "RenderTheme.h"

namespace WebCore {

using namespace HTMLNames;

HTMLMediaElement* toParentMediaElement(RenderObject* o)
{
    Node* node = o->node();
    Node* mediaNode = node ? node->shadowAncestorNode() : 0;
    if (!mediaNode || (!mediaNode->hasTagName(HTMLNames::videoTag) && !mediaNode->hasTagName(HTMLNames::audioTag)))
        return 0;

    return static_cast<HTMLMediaElement*>(mediaNode);
}

// FIXME: These constants may need to be tweaked to better match the seeking in the QuickTime plug-in.
static const float cSeekRepeatDelay = 0.1f;
static const float cStepTime = 0.07f;
static const float cSeekTime = 0.2f;

MediaControlShadowRootElement::MediaControlShadowRootElement(Document* document, HTMLMediaElement* mediaElement)
    : HTMLDivElement(divTag, document)
    , m_mediaElement(mediaElement)
{
    RefPtr<RenderStyle> rootStyle = RenderStyle::create();
    rootStyle->inheritFrom(mediaElement->renderer()->style());
    rootStyle->setDisplay(BLOCK);
    rootStyle->setPosition(RelativePosition);
    RenderMediaControlShadowRoot* renderer = new (mediaElement->renderer()->renderArena()) RenderMediaControlShadowRoot(this);
    renderer->setStyle(rootStyle.release());
    setRenderer(renderer);
    setAttached();
    setInDocument(true);
}

void MediaControlShadowRootElement::updateStyle()
{
    if (renderer()) {
        RenderStyle* timelineContainerStyle = m_mediaElement->renderer()->getCachedPseudoStyle(MEDIA_CONTROLS_TIMELINE_CONTAINER);
        renderer()->setStyle(timelineContainerStyle);
    }
}

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

MediaControlElement::MediaControlElement(Document* document, PseudoId pseudo, HTMLMediaElement* mediaElement)
    : HTMLDivElement(divTag, document)
    , m_mediaElement(mediaElement)
    , m_pseudoStyleId(pseudo)
{
    setInDocument(true);
    switch (pseudo) {
    case MEDIA_CONTROLS_CURRENT_TIME_DISPLAY:
        m_displayType = MediaCurrentTimeDisplay;
        break;
    case MEDIA_CONTROLS_TIME_REMAINING_DISPLAY:
        m_displayType = MediaTimeRemainingDisplay;
        break;
    case MEDIA_CONTROLS_TIMELINE_CONTAINER:
        m_displayType = MediaTimelineContainer;
        break;
    case MEDIA_CONTROLS_STATUS_DISPLAY:
        m_displayType = MediaStatusDisplay;
        break;
    case MEDIA_CONTROLS_PANEL:
        m_displayType = MediaControlsPanel;
        break;
    case MEDIA_CONTROLS_VOLUME_SLIDER_CONTAINER:
        m_displayType = MediaVolumeSliderContainer;
        break;
    default:
        ASSERT_NOT_REACHED();
        break;
    }
}

void MediaControlElement::attachToParent(Element* parent)
{
    parent->addChild(this);
}

void MediaControlElement::update()
{
    if (renderer())
        renderer()->updateFromElement();
    updateStyle();
}

PassRefPtr<RenderStyle> MediaControlElement::styleForElement()
{
    RenderStyle* style = m_mediaElement->renderer()->getCachedPseudoStyle(m_pseudoStyleId);
    if (!style)
        return 0;

    // text-decoration can't be overrided from CSS. So we do it here.
    // See https://bugs.webkit.org/show_bug.cgi?id=27015
    style->setTextDecoration(TDNONE);
    style->setTextDecorationsInEffect(TDNONE);

    return style;
}

bool MediaControlElement::rendererIsNeeded(RenderStyle* style)
{
    ASSERT(document()->page());

    return HTMLDivElement::rendererIsNeeded(style) && parent() && parent()->renderer()
        && (!style->hasAppearance() || document()->page()->theme()->shouldRenderMediaControlPart(style->appearance(), m_mediaElement));
}

void MediaControlElement::attach()
{
    RefPtr<RenderStyle> style = styleForElement();
    if (!style)
        return;
    bool needsRenderer = rendererIsNeeded(style.get());
    if (!needsRenderer)
        return;
    RenderObject* renderer = createRenderer(m_mediaElement->renderer()->renderArena(), style.get());
    if (!renderer)
        return;
    renderer->setStyle(style.get());
    setRenderer(renderer);
    if (parent() && parent()->renderer()) {
        // Find next sibling with a renderer to determine where to insert.
        Node* sibling = nextSibling();
        while (sibling && !sibling->renderer())
            sibling = sibling->nextSibling();
        parent()->renderer()->addChild(renderer, sibling ? sibling->renderer() : 0);
    }
    ContainerNode::attach();
}

void MediaControlElement::updateStyle()
{
    if (!m_mediaElement || !m_mediaElement->renderer())
        return;

    RefPtr<RenderStyle> style = styleForElement();
    if (!style)
        return;

    bool needsRenderer = rendererIsNeeded(style.get()) && parent() && parent()->renderer();
    if (renderer() && !needsRenderer)
        detach();
    else if (!renderer() && needsRenderer)
        attach();
    else if (renderer()) {
        renderer()->setStyle(style.get());

        // Make sure that if there is any innerText renderer, it is updated as well.
        if (firstChild() && firstChild()->renderer())
            firstChild()->renderer()->setStyle(style.get());
    }
}

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

MediaControlTimelineContainerElement::MediaControlTimelineContainerElement(Document* document, HTMLMediaElement* element)
    : MediaControlElement(document, MEDIA_CONTROLS_TIMELINE_CONTAINER, element)
{
}

bool MediaControlTimelineContainerElement::rendererIsNeeded(RenderStyle* style)
{
    if (!MediaControlElement::rendererIsNeeded(style))
        return false;

    // This is for MediaControllerThemeClassic:
    // If there is no style for MediaControlStatusDisplayElement style, don't hide
    // the timeline.
    if (!m_mediaElement->renderer()->getCachedPseudoStyle(MEDIA_CONTROLS_STATUS_DISPLAY))
        return true;

    float duration = m_mediaElement->duration();
    return !isnan(duration) && !isinf(duration);
}

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

MediaControlVolumeSliderContainerElement::MediaControlVolumeSliderContainerElement(Document* doc, HTMLMediaElement* element)
    : MediaControlElement(doc, MEDIA_CONTROLS_VOLUME_SLIDER_CONTAINER, element)
    , m_isVisible(false)
    , m_x(0)
    , m_y(0)
{
}

PassRefPtr<RenderStyle> MediaControlVolumeSliderContainerElement::styleForElement()
{
    RefPtr<RenderStyle> style = MediaControlElement::styleForElement();
    style->setPosition(AbsolutePosition);
    style->setLeft(Length(m_x, Fixed));
    style->setTop(Length(m_y, Fixed));
    style->setDisplay(m_isVisible ? BLOCK : NONE);
    return style;
}

void MediaControlVolumeSliderContainerElement::setVisible(bool visible)
{
    if (visible == m_isVisible)
        return;
    m_isVisible = visible;
}

void MediaControlVolumeSliderContainerElement::setPosition(int x, int y)
{
    if (x == m_x && y == m_y)
        return;
    m_x = x;
    m_y = y;
}

bool MediaControlVolumeSliderContainerElement::hitTest(const IntPoint& absPoint)
{
    if (renderer() && renderer()->style()->hasAppearance())
        return renderer()->theme()->hitTestMediaControlPart(renderer(), absPoint);

    return false;
}

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

MediaControlStatusDisplayElement::MediaControlStatusDisplayElement(Document* document, HTMLMediaElement* element)
    : MediaControlElement(document, MEDIA_CONTROLS_STATUS_DISPLAY, element)
    , m_stateBeingDisplayed(Nothing)
{
}

void MediaControlStatusDisplayElement::update()
{
    MediaControlElement::update();

    // Get the new state that we'll have to display.
    StateBeingDisplayed newStateToDisplay = Nothing;

    if (m_mediaElement->readyState() != HTMLMediaElement::HAVE_ENOUGH_DATA && !m_mediaElement->currentSrc().isEmpty())
        newStateToDisplay = Loading;
    else if (m_mediaElement->movieLoadType() == MediaPlayer::LiveStream)
        newStateToDisplay = LiveBroadcast;

    // Propagate only if needed.
    if (newStateToDisplay == m_stateBeingDisplayed)
        return;
    m_stateBeingDisplayed = newStateToDisplay;

    ExceptionCode e;
    switch (m_stateBeingDisplayed) {
    case Nothing:
        setInnerText("", e);
        break;
    case Loading:
        setInnerText(mediaElementLoadingStateText(), e);
        break;
    case LiveBroadcast:
        setInnerText(mediaElementLiveBroadcastStateText(), e);
        break;
    }
}

bool MediaControlStatusDisplayElement::rendererIsNeeded(RenderStyle* style)
{
    if (!MediaControlElement::rendererIsNeeded(style))
        return false;
    float duration = m_mediaElement->duration();
    return (isnan(duration) || isinf(duration));
}

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

MediaControlInputElement::MediaControlInputElement(Document* document, PseudoId pseudo, const String& type, HTMLMediaElement* mediaElement)
    : HTMLInputElement(inputTag, document)
    , m_mediaElement(mediaElement)
    , m_pseudoStyleId(pseudo)
{
    setInputType(type);
    setInDocument(true);

    switch (pseudo) {
    case MEDIA_CONTROLS_MUTE_BUTTON:
        m_displayType = MediaMuteButton;
        break;
    case MEDIA_CONTROLS_PLAY_BUTTON:
        m_displayType = MediaPlayButton;
        break;
    case MEDIA_CONTROLS_SEEK_FORWARD_BUTTON:
        m_displayType = MediaSeekForwardButton;
        break;
    case MEDIA_CONTROLS_SEEK_BACK_BUTTON:
        m_displayType = MediaSeekBackButton;
        break;
    case MEDIA_CONTROLS_FULLSCREEN_BUTTON:
        m_displayType = MediaFullscreenButton;
        break;
    case MEDIA_CONTROLS_TIMELINE:
        m_displayType = MediaSlider;
        break;
    case MEDIA_CONTROLS_RETURN_TO_REALTIME_BUTTON:
        m_displayType = MediaReturnToRealtimeButton;
        break;
    case MEDIA_CONTROLS_REWIND_BUTTON:
        m_displayType = MediaRewindButton;
        break;
    case MEDIA_CONTROLS_VOLUME_SLIDER:
        m_displayType = MediaVolumeSlider;
        break;
    case MEDIA_CONTROLS_TOGGLE_CLOSED_CAPTIONS_BUTTON:
        m_displayType = MediaShowClosedCaptionsButton;
        break;
    default:
        ASSERT_NOT_REACHED();
        break;
    }
}

void MediaControlInputElement::attachToParent(Element* parent)
{
    parent->addChild(this);
}

void MediaControlInputElement::update()
{
    updateDisplayType();
    if (renderer())
        renderer()->updateFromElement();
    updateStyle();
}

PassRefPtr<RenderStyle> MediaControlInputElement::styleForElement()
{
    return m_mediaElement->renderer()->getCachedPseudoStyle(m_pseudoStyleId);
}

bool MediaControlInputElement::rendererIsNeeded(RenderStyle* style)
{
    ASSERT(document()->page());

    return HTMLInputElement::rendererIsNeeded(style) && parent() && parent()->renderer()
        && (!style->hasAppearance() || document()->page()->theme()->shouldRenderMediaControlPart(style->appearance(), m_mediaElement));
}

void MediaControlInputElement::attach()
{
    RefPtr<RenderStyle> style = styleForElement();
    if (!style)
        return;

    bool needsRenderer = rendererIsNeeded(style.get());
    if (!needsRenderer)
        return;
    RenderObject* renderer = createRenderer(m_mediaElement->renderer()->renderArena(), style.get());
    if (!renderer)
        return;
    renderer->setStyle(style.get());
    setRenderer(renderer);
    if (parent() && parent()->renderer()) {
        // Find next sibling with a renderer to determine where to insert.
        Node* sibling = nextSibling();
        while (sibling && !sibling->renderer())
            sibling = sibling->nextSibling();
        parent()->renderer()->addChild(renderer, sibling ? sibling->renderer() : 0);
    }
    ContainerNode::attach();
}

void MediaControlInputElement::updateStyle()
{
    if (!m_mediaElement || !m_mediaElement->renderer())
        return;

    RefPtr<RenderStyle> style = styleForElement();
    if (!style)
        return;

    bool needsRenderer = rendererIsNeeded(style.get()) && parent() && parent()->renderer();
    if (renderer() && !needsRenderer)
        detach();
    else if (!renderer() && needsRenderer)
        attach();
    else if (renderer())
        renderer()->setStyle(style.get());
}

bool MediaControlInputElement::hitTest(const IntPoint& absPoint)
{
    if (renderer() && renderer()->style()->hasAppearance())
        return renderer()->theme()->hitTestMediaControlPart(renderer(), absPoint);

    return false;
}

void MediaControlInputElement::setDisplayType(MediaControlElementType displayType)
{
    if (displayType == m_displayType)
        return;

    m_displayType = displayType;
    if (RenderObject* object = renderer())
        object->repaint();
}

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

MediaControlMuteButtonElement::MediaControlMuteButtonElement(Document* document, HTMLMediaElement* element)
    : MediaControlInputElement(document, MEDIA_CONTROLS_MUTE_BUTTON, "button", element)
{
}

void MediaControlMuteButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == eventNames().clickEvent) {
        m_mediaElement->setMuted(!m_mediaElement->muted());
        event->setDefaultHandled();
    }
    HTMLInputElement::defaultEventHandler(event);
}

void MediaControlMuteButtonElement::updateDisplayType()
{
    setDisplayType(m_mediaElement->muted() ? MediaUnMuteButton : MediaMuteButton);
}

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

MediaControlPlayButtonElement::MediaControlPlayButtonElement(Document* document, HTMLMediaElement* element)
    : MediaControlInputElement(document, MEDIA_CONTROLS_PLAY_BUTTON, "button", element)
{
}

void MediaControlPlayButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == eventNames().clickEvent) {
        m_mediaElement->togglePlayState();
        event->setDefaultHandled();
    }
    HTMLInputElement::defaultEventHandler(event);
}

void MediaControlPlayButtonElement::updateDisplayType()
{
    setDisplayType(m_mediaElement->canPlay() ? MediaPlayButton : MediaPauseButton);
}

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

MediaControlSeekButtonElement::MediaControlSeekButtonElement(Document* document, HTMLMediaElement* element, bool forward)
    : MediaControlInputElement(document, forward ? MEDIA_CONTROLS_SEEK_FORWARD_BUTTON : MEDIA_CONTROLS_SEEK_BACK_BUTTON,
                               "button", element)
    , m_forward(forward)
    , m_seeking(false)
    , m_capturing(false)
    , m_seekTimer(this, &MediaControlSeekButtonElement::seekTimerFired)
{
}

void MediaControlSeekButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == eventNames().mousedownEvent) {
        if (Frame* frame = document()->frame()) {
            m_capturing = true;
            frame->eventHandler()->setCapturingMouseEventsNode(this);
        }
        m_mediaElement->pause(event->fromUserGesture());
        m_seekTimer.startRepeating(cSeekRepeatDelay);
        event->setDefaultHandled();
    } else if (event->type() == eventNames().mouseupEvent) {
        if (m_capturing)
            if (Frame* frame = document()->frame()) {
                m_capturing = false;
                frame->eventHandler()->setCapturingMouseEventsNode(0);
            }
        ExceptionCode ec;
        if (m_seeking || m_seekTimer.isActive()) {
            if (!m_seeking) {
                float stepTime = m_forward ? cStepTime : -cStepTime;
                m_mediaElement->setCurrentTime(m_mediaElement->currentTime() + stepTime, ec);
            }
            m_seekTimer.stop();
            m_seeking = false;
            event->setDefaultHandled();
        }
    }
    HTMLInputElement::defaultEventHandler(event);
}

void MediaControlSeekButtonElement::seekTimerFired(Timer<MediaControlSeekButtonElement>*)
{
    ExceptionCode ec;
    m_seeking = true;
    float seekTime = m_forward ? cSeekTime : -cSeekTime;
    m_mediaElement->setCurrentTime(m_mediaElement->currentTime() + seekTime, ec);
}

void MediaControlSeekButtonElement::detach()
{
    if (m_capturing) {
        if (Frame* frame = document()->frame())
            frame->eventHandler()->setCapturingMouseEventsNode(0);
    }
    MediaControlInputElement::detach();
}


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

MediaControlRewindButtonElement::MediaControlRewindButtonElement(Document* document, HTMLMediaElement* element)
    : MediaControlInputElement(document, MEDIA_CONTROLS_REWIND_BUTTON, "button", element)
{
}

void MediaControlRewindButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == eventNames().clickEvent) {
        m_mediaElement->rewind(30);
        event->setDefaultHandled();
    }
    HTMLInputElement::defaultEventHandler(event);
}


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

MediaControlReturnToRealtimeButtonElement::MediaControlReturnToRealtimeButtonElement(Document* document, HTMLMediaElement* element)
    : MediaControlInputElement(document, MEDIA_CONTROLS_RETURN_TO_REALTIME_BUTTON, "button", element)
{
}

void MediaControlReturnToRealtimeButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == eventNames().clickEvent) {
        m_mediaElement->returnToRealtime();
        event->setDefaultHandled();
    }
    HTMLInputElement::defaultEventHandler(event);
}


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

MediaControlToggleClosedCaptionsButtonElement::MediaControlToggleClosedCaptionsButtonElement(Document* doc, HTMLMediaElement* element)
    : MediaControlInputElement(doc, MEDIA_CONTROLS_TOGGLE_CLOSED_CAPTIONS_BUTTON, "button", element)
{
}

void MediaControlToggleClosedCaptionsButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == eventNames().clickEvent) {
        m_mediaElement->setClosedCaptionsVisible(!m_mediaElement->closedCaptionsVisible());
        setChecked(m_mediaElement->closedCaptionsVisible());
        event->setDefaultHandled();
    }
    HTMLInputElement::defaultEventHandler(event);
}

void MediaControlToggleClosedCaptionsButtonElement::updateDisplayType()
{
    setDisplayType(m_mediaElement->closedCaptionsVisible() ? MediaHideClosedCaptionsButton : MediaShowClosedCaptionsButton);
}


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

MediaControlTimelineElement::MediaControlTimelineElement(Document* document, HTMLMediaElement* element)
    : MediaControlInputElement(document, MEDIA_CONTROLS_TIMELINE, "range", element)
{
}

void MediaControlTimelineElement::defaultEventHandler(Event* event)
{
    // Left button is 0. Rejects mouse events not from left button.
    if (event->isMouseEvent() && static_cast<MouseEvent*>(event)->button())
        return;

    if (event->type() == eventNames().mousedownEvent)
        m_mediaElement->beginScrubbing();

    MediaControlInputElement::defaultEventHandler(event);

    if (event->type() == eventNames().mouseoverEvent || event->type() == eventNames().mouseoutEvent || event->type() == eventNames().mousemoveEvent)
        return;

    float time = narrowPrecisionToFloat(value().toDouble());
    if (time != m_mediaElement->currentTime()) {
        ExceptionCode ec;
        m_mediaElement->setCurrentTime(time, ec);
    }

    RenderSlider* slider = toRenderSlider(renderer());
    if (slider && slider->inDragMode())
        toRenderMedia(m_mediaElement->renderer())->updateTimeDisplay();

    if (event->type() == eventNames().mouseupEvent)
        m_mediaElement->endScrubbing();
}

void MediaControlTimelineElement::update(bool updateDuration)
{
    if (updateDuration) {
        float dur = m_mediaElement->duration();
        setAttribute(maxAttr, String::number(isfinite(dur) ? dur : 0));
    }
    setValue(String::number(m_mediaElement->currentTime()));
    MediaControlInputElement::update();
}

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

MediaControlVolumeSliderElement::MediaControlVolumeSliderElement(Document* document, HTMLMediaElement* element)
    : MediaControlInputElement(document, MEDIA_CONTROLS_VOLUME_SLIDER, "range", element)
{
}

void MediaControlVolumeSliderElement::defaultEventHandler(Event* event)
{
    // Left button is 0. Rejects mouse events not from left button.
    if (event->isMouseEvent() && static_cast<MouseEvent*>(event)->button())
        return;

    MediaControlInputElement::defaultEventHandler(event);

    if (event->type() == eventNames().mouseoverEvent || event->type() == eventNames().mouseoutEvent || event->type() == eventNames().mousemoveEvent)
        return;

    float volume = narrowPrecisionToFloat(value().toDouble());
    if (volume != m_mediaElement->volume()) {
        ExceptionCode ec = 0;
        m_mediaElement->setVolume(volume, ec);
        ASSERT(!ec);
    }
}

void MediaControlVolumeSliderElement::update()
{
    float volume = m_mediaElement->volume();
    if (value().toFloat() != volume)
        setValue(String::number(volume));
    MediaControlInputElement::update();
}

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

MediaControlFullscreenButtonElement::MediaControlFullscreenButtonElement(Document* document, HTMLMediaElement* element)
    : MediaControlInputElement(document, MEDIA_CONTROLS_FULLSCREEN_BUTTON, "button", element)
{
}

void MediaControlFullscreenButtonElement::defaultEventHandler(Event* event)
{
    if (event->type() == eventNames().clickEvent) {
        m_mediaElement->enterFullscreen();
        event->setDefaultHandled();
    }
    HTMLInputElement::defaultEventHandler(event);
}

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

MediaControlTimeDisplayElement::MediaControlTimeDisplayElement(Document* document, PseudoId pseudo, HTMLMediaElement* element)
    : MediaControlElement(document, pseudo, element)
    , m_currentValue(0)
    , m_isVisible(true)
{
}

PassRefPtr<RenderStyle> MediaControlTimeDisplayElement::styleForElement()
{
    RefPtr<RenderStyle> style = MediaControlElement::styleForElement();
    if (!m_isVisible) {
        style = RenderStyle::clone(style.get());
        style->setWidth(Length(0, Fixed));
    }
    return style;
}

void MediaControlTimeDisplayElement::setVisible(bool visible)
{
    if (visible == m_isVisible)
        return;
    m_isVisible = visible;

    // This function is used during the RenderMedia::layout()
    // call, where we cannot change the renderer at this time.
    if (!renderer() || !renderer()->style())
        return;

    RefPtr<RenderStyle> style = styleForElement();
    renderer()->setStyle(style.get());
}

void MediaControlTimeDisplayElement::setCurrentValue(float time)
{
    m_currentValue = time;
}


} //namespace WebCore
#endif // enable(video)