| // 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 <memory> |
| |
| #include "base/macros.h" |
| #include "core/CoreExport.h" |
| #include "platform/heap/Handle.h" |
| #include "platform/wtf/Allocator.h" |
| |
| 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 CORE_EXPORT IncrementLoadEventDelayCount { |
| USING_FAST_MALLOC(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& new_document); |
| |
| private: |
| IncrementLoadEventDelayCount(Document&); |
| WeakPersistent<Document> document_; |
| DISALLOW_COPY_AND_ASSIGN(IncrementLoadEventDelayCount); |
| }; |
| } // namespace blink |
| |
| #endif |