third_party/WebKit/Source/modules/accessibility/AXMediaControls.cpp

/*
 * Copyright (C) 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
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 *     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
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#include "modules/accessibility/AXMediaControls.h"

#include "modules/accessibility/AXObjectCacheImpl.h"
#include "platform/text/PlatformLocale.h"

namespace blink {

using blink::WebLocalizedString;
using namespace HTMLNames;

static inline String queryString(WebLocalizedString::Name name)
{
    return Locale::defaultLocale().queryString(name);
}

AccessibilityMediaControl::AccessibilityMediaControl(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
    : AXLayoutObject(layoutObject, axObjectCache)
{
}

AXObject* AccessibilityMediaControl::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
{
    ASSERT(layoutObject->node());

    switch (mediaControlElementType(layoutObject->node())) {
    case MediaSlider:
        return AccessibilityMediaTimeline::create(layoutObject, axObjectCache);

    case MediaCurrentTimeDisplay:
    case MediaTimeRemainingDisplay:
        return AccessibilityMediaTimeDisplay::create(layoutObject, axObjectCache);

    case MediaControlsPanel:
        return AXMediaControlsContainer::create(layoutObject, axObjectCache);

    default:
        return new AccessibilityMediaControl(layoutObject, axObjectCache);
    }
}

MediaControlElementType AccessibilityMediaControl::controlType() const
{
    if (!getLayoutObject() || !getLayoutObject()->node())
        return MediaTimelineContainer; // Timeline container is not accessible.

    return mediaControlElementType(getLayoutObject()->node());
}

String AccessibilityMediaControl::textAlternative(bool recursive, bool inAriaLabelledByTraversal, AXObjectSet& visited, AXNameFrom& nameFrom, AXRelatedObjectVector* relatedObjects, NameSources* nameSources) const
{
    switch (controlType()) {
    case MediaEnterFullscreenButton:
        return queryString(WebLocalizedString::AXMediaEnterFullscreenButton);
    case MediaExitFullscreenButton:
        return queryString(WebLocalizedString::AXMediaExitFullscreenButton);
    case MediaMuteButton:
        return queryString(WebLocalizedString::AXMediaMuteButton);
    case MediaPlayButton:
        return queryString(WebLocalizedString::AXMediaPlayButton);
    case MediaUnMuteButton:
        return queryString(WebLocalizedString::AXMediaUnMuteButton);
    case MediaPauseButton:
        return queryString(WebLocalizedString::AXMediaPauseButton);
    case MediaCurrentTimeDisplay:
        return queryString(WebLocalizedString::AXMediaCurrentTimeDisplay);
    case MediaTimeRemainingDisplay:
        return queryString(WebLocalizedString::AXMediaTimeRemainingDisplay);
    case MediaShowClosedCaptionsButton:
        return queryString(WebLocalizedString::AXMediaShowClosedCaptionsButton);
    case MediaHideClosedCaptionsButton:
        return queryString(WebLocalizedString::AXMediaHideClosedCaptionsButton);
    case MediaCastOffButton:
        return queryString(WebLocalizedString::AxMediaCastOffButton);
    case MediaCastOnButton:
        return queryString(WebLocalizedString::AxMediaCastOnButton);
    default:
        return queryString(WebLocalizedString::AXMediaDefault);
    }
}

String AccessibilityMediaControl::description(AXNameFrom nameFrom, AXDescriptionFrom& descriptionFrom, AXObjectVector* descriptionObjects) const
{
    switch (controlType()) {
    case MediaEnterFullscreenButton:
        return queryString(WebLocalizedString::AXMediaEnterFullscreenButtonHelp);
    case MediaExitFullscreenButton:
        return queryString(WebLocalizedString::AXMediaExitFullscreenButtonHelp);
    case MediaMuteButton:
        return queryString(WebLocalizedString::AXMediaMuteButtonHelp);
    case MediaPlayButton:
        return queryString(WebLocalizedString::AXMediaPlayButtonHelp);
    case MediaUnMuteButton:
        return queryString(WebLocalizedString::AXMediaUnMuteButtonHelp);
    case MediaPauseButton:
        return queryString(WebLocalizedString::AXMediaPauseButtonHelp);
    case MediaCurrentTimeDisplay:
        return queryString(WebLocalizedString::AXMediaCurrentTimeDisplayHelp);
    case MediaTimeRemainingDisplay:
        return queryString(WebLocalizedString::AXMediaTimeRemainingDisplayHelp);
    case MediaShowClosedCaptionsButton:
        return queryString(WebLocalizedString::AXMediaShowClosedCaptionsButtonHelp);
    case MediaHideClosedCaptionsButton:
        return queryString(WebLocalizedString::AXMediaHideClosedCaptionsButtonHelp);
    case MediaCastOffButton:
        return queryString(WebLocalizedString::AxMediaCastOffButtonHelp);
    case MediaCastOnButton:
        return queryString(WebLocalizedString::AxMediaCastOnButtonHelp);
    default:
        return queryString(WebLocalizedString::AXMediaDefault);
    }
}

bool AccessibilityMediaControl::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReasons) const
{
    if (!m_layoutObject || !m_layoutObject->style() || m_layoutObject->style()->visibility() != EVisibility::Visible || controlType() == MediaTimelineContainer)
        return true;

    return accessibilityIsIgnoredByDefault(ignoredReasons);
}

AccessibilityRole AccessibilityMediaControl::roleValue() const
{
    switch (controlType()) {
    case MediaEnterFullscreenButton:
    case MediaExitFullscreenButton:
    case MediaMuteButton:
    case MediaPlayButton:
    case MediaUnMuteButton:
    case MediaPauseButton:
    case MediaShowClosedCaptionsButton:
    case MediaHideClosedCaptionsButton:
        return ButtonRole;

    case MediaTimelineContainer:
        return GroupRole;

    default:
        break;
    }

    return UnknownRole;
}



//
// AXMediaControlsContainer

AXMediaControlsContainer::AXMediaControlsContainer(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
    : AccessibilityMediaControl(layoutObject, axObjectCache)
{
}

AXObject* AXMediaControlsContainer::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
{
    return new AXMediaControlsContainer(layoutObject, axObjectCache);
}

String AXMediaControlsContainer::textAlternative(bool recursive, bool inAriaLabelledByTraversal, AXObjectSet& visited, AXNameFrom& nameFrom, AXRelatedObjectVector* relatedObjects, NameSources* nameSources) const
{
    return queryString(isControllingVideoElement() ? WebLocalizedString::AXMediaVideoElement : WebLocalizedString::AXMediaAudioElement);
}

String AXMediaControlsContainer::description(AXNameFrom nameFrom, AXDescriptionFrom& descriptionFrom, AXObjectVector* descriptionObjects) const
{
    return queryString(isControllingVideoElement() ? WebLocalizedString::AXMediaVideoElementHelp : WebLocalizedString::AXMediaAudioElementHelp);
}

bool AXMediaControlsContainer::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReasons) const
{
    return accessibilityIsIgnoredByDefault(ignoredReasons);
}

//
// AccessibilityMediaTimeline

static String localizedMediaTimeDescription(float /*time*/)
{
    // FIXME: To be fixed. See
    // http://trac.webkit.org/browser/trunk/Source/WebCore/platform/LocalizedStrings.cpp#L928
    return String();
}

AccessibilityMediaTimeline::AccessibilityMediaTimeline(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
    : AXSlider(layoutObject, axObjectCache)
{
}

AXObject* AccessibilityMediaTimeline::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
{
    return new AccessibilityMediaTimeline(layoutObject, axObjectCache);
}

String AccessibilityMediaTimeline::valueDescription() const
{
    Node* node = m_layoutObject->node();
    if (!isHTMLInputElement(node))
        return String();

    return localizedMediaTimeDescription(toHTMLInputElement(node)->value().toFloat());
}

String AccessibilityMediaTimeline::description(AXNameFrom nameFrom, AXDescriptionFrom& descriptionFrom, AXObjectVector* descriptionObjects) const
{
    return queryString(isControllingVideoElement() ? WebLocalizedString::AXMediaVideoSliderHelp : WebLocalizedString::AXMediaAudioSliderHelp);
}


//
// AccessibilityMediaTimeDisplay

AccessibilityMediaTimeDisplay::AccessibilityMediaTimeDisplay(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
    : AccessibilityMediaControl(layoutObject, axObjectCache)
{
}

AXObject* AccessibilityMediaTimeDisplay::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
{
    return new AccessibilityMediaTimeDisplay(layoutObject, axObjectCache);
}

bool AccessibilityMediaTimeDisplay::computeAccessibilityIsIgnored(IgnoredReasons* ignoredReasons) const
{
    if (!m_layoutObject || !m_layoutObject->style() || m_layoutObject->style()->visibility() != EVisibility::Visible)
        return true;

    if (!m_layoutObject->style()->width().value())
        return true;

    return accessibilityIsIgnoredByDefault(ignoredReasons);
}

String AccessibilityMediaTimeDisplay::textAlternative(bool recursive, bool inAriaLabelledByTraversal, AXObjectSet& visited, AXNameFrom& nameFrom, AXRelatedObjectVector* relatedObjects, NameSources* nameSources) const
{
    if (controlType() == MediaCurrentTimeDisplay)
        return queryString(WebLocalizedString::AXMediaCurrentTimeDisplay);
    return queryString(WebLocalizedString::AXMediaTimeRemainingDisplay);
}

String AccessibilityMediaTimeDisplay::stringValue() const
{
    if (!m_layoutObject || !m_layoutObject->node())
        return String();

    MediaControlTimeDisplayElement* element = static_cast<MediaControlTimeDisplayElement*>(m_layoutObject->node());
    float time = element->currentValue();
    return localizedMediaTimeDescription(fabsf(time));
}

} // namespace blink