| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * 3. Neither the name of Google Inc. nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "third_party/blink/renderer/core/html/custom/v0_custom_element_observer.h" |
| |
| #include "third_party/blink/renderer/core/dom/element.h" |
| #include "third_party/blink/renderer/platform/heap/persistent.h" |
| |
| namespace blink { |
| |
| // Maps elements to the observer watching them. At most one per |
| // element at a time. |
| typedef HeapHashMap<WeakMember<Element>, Member<V0CustomElementObserver>> |
| ElementObserverMap; |
| |
| static ElementObserverMap& ElementObservers() { |
| DEFINE_STATIC_LOCAL(Persistent<ElementObserverMap>, map, |
| (MakeGarbageCollected<ElementObserverMap>())); |
| return *map; |
| } |
| |
| void V0CustomElementObserver::NotifyElementWasDestroyed(Element* element) { |
| ElementObserverMap::iterator it = ElementObservers().find(element); |
| if (it == ElementObservers().end()) |
| return; |
| it->value->ElementWasDestroyed(element); |
| } |
| |
| void V0CustomElementObserver::Observe(Element* element) { |
| ElementObserverMap::AddResult result = |
| ElementObservers().insert(element, this); |
| DCHECK(result.is_new_entry); |
| } |
| |
| void V0CustomElementObserver::Unobserve(Element* element) { |
| V0CustomElementObserver* observer = ElementObservers().Take(element); |
| DCHECK_EQ(observer, this); |
| } |
| |
| } // namespace blink |