third_party/blink/renderer/core/html/custom/v0_custom_element_callback_queue.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    in the documentation and/or other materials provided with the
 *    distribution.
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 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CUSTOM_V0_CUSTOM_ELEMENT_CALLBACK_QUEUE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CUSTOM_V0_CUSTOM_ELEMENT_CALLBACK_QUEUE_H_

#include "base/macros.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/html/custom/v0_custom_element_processing_step.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"

namespace blink {

// FIXME: Rename this because it contains resolution and upgrade as
// well as callbacks.
class V0CustomElementCallbackQueue
    : public GarbageCollected<V0CustomElementCallbackQueue> {
 public:
  static V0CustomElementCallbackQueue* Create(Element*);

  explicit V0CustomElementCallbackQueue(Element*);

  typedef int ElementQueueId;
  ElementQueueId Owner() const { return owner_; }

  void SetOwner(ElementQueueId new_owner) {
    // ElementCallbackQueues only migrate towards the top of the
    // processing stack.
    DCHECK_GE(new_owner, owner_);
    owner_ = new_owner;
  }

  bool ProcessInElementQueue(ElementQueueId);

  void Append(V0CustomElementProcessingStep* invocation) {
    queue_.push_back(invocation);
  }
  bool InCreatedCallback() const { return in_created_callback_; }

  void Trace(blink::Visitor*);

 private:
  Member<Element> element_;
  HeapVector<Member<V0CustomElementProcessingStep>> queue_;
  ElementQueueId owner_;
  wtf_size_t index_;
  bool in_created_callback_;

  DISALLOW_COPY_AND_ASSIGN(V0CustomElementCallbackQueue);
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CUSTOM_V0_CUSTOM_ELEMENT_CALLBACK_QUEUE_H_