third_party/WebKit/Source/modules/media_controls/elements/MediaControlToggleClosedCaptionsButtonElement.cpp

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "modules/media_controls/elements/MediaControlToggleClosedCaptionsButtonElement.h"

#include "core/InputTypeNames.h"
#include "core/events/Event.h"
#include "core/html/HTMLMediaElement.h"
#include "core/html/track/TextTrackList.h"
#include "modules/media_controls/MediaControlsImpl.h"

namespace blink {

MediaControlToggleClosedCaptionsButtonElement::
    MediaControlToggleClosedCaptionsButtonElement(
        MediaControlsImpl& media_controls)
    : MediaControlInputElement(media_controls, kMediaShowClosedCaptionsButton) {
  EnsureUserAgentShadowRoot();
  setType(InputTypeNames::button);
  SetShadowPseudoId(
      AtomicString("-webkit-media-controls-toggle-closed-captions-button"));
}

bool MediaControlToggleClosedCaptionsButtonElement::
    WillRespondToMouseClickEvents() {
  return true;
}

void MediaControlToggleClosedCaptionsButtonElement::UpdateDisplayType() {
  bool captions_visible = MediaElement().TextTracksVisible();
  SetDisplayType(captions_visible ? kMediaHideClosedCaptionsButton
                                  : kMediaShowClosedCaptionsButton);
}

WebLocalizedString::Name
MediaControlToggleClosedCaptionsButtonElement::GetOverflowStringName() {
  return WebLocalizedString::kOverflowMenuCaptions;
}

bool MediaControlToggleClosedCaptionsButtonElement::HasOverflowButton() {
  return true;
}

void MediaControlToggleClosedCaptionsButtonElement::DefaultEventHandler(
    Event* event) {
  if (event->type() == EventTypeNames::click) {
    if (MediaElement().textTracks()->length() == 1) {
      // If only one track exists, toggle it on/off
      if (MediaElement().textTracks()->HasShowingTracks()) {
        static_cast<MediaControlsImpl&>(GetMediaControls())
            .DisableShowingTextTracks();
      } else {
        static_cast<MediaControlsImpl&>(GetMediaControls())
            .ShowTextTrackAtIndex(0);
      }
    } else {
      static_cast<MediaControlsImpl&>(GetMediaControls()).ToggleTextTrackList();
    }

    UpdateDisplayType();
    event->SetDefaultHandled();
  }

  MediaControlInputElement::DefaultEventHandler(event);
}

}  // namespace blink