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// Copyright 2014 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.
#ifndef IncrementLoadEventDelayCount_h
#define IncrementLoadEventDelayCount_h
#include "platform/heap/Handle.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
#include <memory>
namespace blink {
class Document;
// A helper class that will increment a document's loadEventDelayCount on
// contruction and decrement it on destruction (semantics similar to RefPtr).
class IncrementLoadEventDelayCount {
USING_FAST_MALLOC(IncrementLoadEventDelayCount);
WTF_MAKE_NONCOPYABLE(IncrementLoadEventDelayCount);
public:
static std::unique_ptr<IncrementLoadEventDelayCount> create(Document&);
~IncrementLoadEventDelayCount();
// Decrements the loadEventDelayCount and checks load event synchronously,
// and thus can cause synchronous Document load event/JavaScript execution.
// Call this only when it is safe, e.g. at the top of an async task.
// After calling this, |this| no longer blocks document's load event and
// will not decrement loadEventDelayCount at destruction.
void clearAndCheckLoadEvent();
// Increments the new document's count and decrements the old count.
void documentChanged(Document& newDocument);
private:
IncrementLoadEventDelayCount(Document&);
Persistent<Document> m_document;
};
} // namespace blink
#endif
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