chromium/src/third_party/blink/renderer/core/html/track/text_track_container.h

/*
 * 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
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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_TRACK_TEXT_TRACK_CONTAINER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_TRACK_TEXT_TRACK_CONTAINER_H_

#include "third_party/blink/renderer/core/html/html_div_element.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"

namespace blink {

class HTMLMediaElement;

class TextTrackContainer final : public HTMLDivElement {
 public:
  TextTrackContainer(HTMLMediaElement&);

  // Node override.
  Node::InsertionNotificationRequest InsertedInto(ContainerNode&) override;
  void RemovedFrom(ContainerNode&) override;

  // Runs the "rules for updating the text track rendering". The
  // ExposingControls enum is used in the WebVTT processing model to reset the
  // layout when the media controls become visible, to avoid overlapping them.
  enum ExposingControls {
    kDidNotStartExposingControls,
    kDidStartExposingControls
  };
  void UpdateDisplay(HTMLMediaElement&, ExposingControls);
  void UpdateDefaultFontSize(LayoutObject*);

  void Trace(Visitor*) const override;

 private:
  bool IsTextTrackContainer() const override { return true; }
  void ObserveSizeChanges(Element&);

  LayoutObject* CreateLayoutObject(const ComputedStyle&, LegacyLayout) override;

  Member<HTMLMediaElement> media_element_;
  Member<ResizeObserver> video_size_observer_;
  float default_font_size_;
};

template <>
struct DowncastTraits<TextTrackContainer> {
  static bool AllowFrom(const Node& node) {
    return node.IsTextTrackContainer();
  }
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_TRACK_TEXT_TRACK_CONTAINER_H_