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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 #include "config.h"
     32 #include "core/dom/PostAttachCallbacks.h"
     33 
     34 #include "core/dom/Node.h"
     35 #include "wtf/RefPtr.h"
     36 
     37 namespace WebCore {
     38 
     39 typedef std::pair<PostAttachCallbacks::Callback, RefPtr<Node> > CallbackInfo;
     40 typedef Vector<CallbackInfo> CallbackQueue;
     41 
     42 static size_t s_attachDepth;
     43 
     44 static CallbackQueue& callbackQueue()
     45 {
     46     DEFINE_STATIC_LOCAL(CallbackQueue, callbackQueue, ());
     47     return callbackQueue;
     48 }
     49 
     50 void PostAttachCallbacks::queueCallback(Callback callback, Node* node)
     51 {
     52     callbackQueue().append(CallbackInfo(callback, node));
     53 }
     54 
     55 PostAttachCallbacks::SuspendScope::SuspendScope()
     56 {
     57     ++s_attachDepth;
     58 }
     59 
     60 PostAttachCallbacks::SuspendScope::~SuspendScope()
     61 {
     62     if (s_attachDepth == 1) {
     63         // We recalculate size() each time through the loop because a callback
     64         // can add more callbacks to the end of the queue.
     65         CallbackQueue& queue = callbackQueue();
     66         for (size_t i = 0; i < queue.size(); ++i) {
     67             const CallbackInfo& info = queue[i];
     68             info.first(info.second.get());
     69         }
     70         queue.clear();
     71     }
     72     --s_attachDepth;
     73 }
     74 
     75 } // namespace WebCore
     76