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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer
     12  *    in the documentation and/or other materials provided with the
     13  *    distribution.
     14  * 3. Neither the name of Google Inc. nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this
     16  *    software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef CustomElementCallbackQueue_h
     32 #define CustomElementCallbackQueue_h
     33 
     34 #include "core/dom/Element.h"
     35 #include "core/dom/custom/CustomElementProcessingStep.h"
     36 #include "platform/heap/Handle.h"
     37 #include "wtf/OwnPtr.h"
     38 #include "wtf/PassOwnPtr.h"
     39 #include "wtf/PassRefPtr.h"
     40 #include "wtf/RefPtr.h"
     41 #include "wtf/Vector.h"
     42 
     43 namespace blink {
     44 
     45 // FIXME: Rename this because it contains resolution and upgrade as
     46 // well as callbacks.
     47 class CustomElementCallbackQueue : public NoBaseWillBeGarbageCollectedFinalized<CustomElementCallbackQueue> {
     48     WTF_MAKE_NONCOPYABLE(CustomElementCallbackQueue);
     49 public:
     50     static PassOwnPtrWillBeRawPtr<CustomElementCallbackQueue> create(PassRefPtrWillBeRawPtr<Element>);
     51 
     52     typedef int ElementQueueId;
     53     ElementQueueId owner() const { return m_owner; }
     54 
     55     void setOwner(ElementQueueId newOwner)
     56     {
     57         // ElementCallbackQueues only migrate towards the top of the
     58         // processing stack.
     59         ASSERT(newOwner >= m_owner);
     60         m_owner = newOwner;
     61     }
     62 
     63     bool processInElementQueue(ElementQueueId);
     64 
     65     void append(PassOwnPtr<CustomElementProcessingStep> invocation) { m_queue.append(invocation); }
     66     bool inCreatedCallback() const { return m_inCreatedCallback; }
     67 
     68     void trace(Visitor*);
     69 
     70 private:
     71     explicit CustomElementCallbackQueue(PassRefPtrWillBeRawPtr<Element>);
     72 
     73     RefPtrWillBeMember<Element> m_element;
     74     Vector<OwnPtr<CustomElementProcessingStep> > m_queue;
     75     ElementQueueId m_owner;
     76     size_t m_index;
     77     bool m_inCreatedCallback;
     78 };
     79 
     80 }
     81 
     82 #endif // CustomElementCallbackQueue_h
     83