Index: third_party/WebKit/Source/core/observer/ResizeObserver.cpp |
diff --git a/third_party/WebKit/Source/core/observer/ResizeObserver.cpp b/third_party/WebKit/Source/core/observer/ResizeObserver.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..efaae56de77e7337b177baccedec3af1829621a3 |
--- /dev/null |
+++ b/third_party/WebKit/Source/core/observer/ResizeObserver.cpp |
@@ -0,0 +1,105 @@ |
+// Copyright 2016 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. |
+ |
+#include "core/observer/ResizeObserver.h" |
+ |
+#include "core/dom/Element.h" |
+#include "core/frame/FrameView.h" |
+#include "core/frame/LocalFrame.h" |
+#include "core/observer/ResizeObservation.h" |
+#include "core/observer/ResizeObserverCallback.h" |
+#include "core/observer/ResizeObserverController.h" |
+#include "core/observer/ResizeObserverEntry.h" |
+ |
+namespace blink { |
+ |
+ResizeObserver* ResizeObserver::create(Document& document, ResizeObserverCallback* callback) |
+{ |
+ auto observer = new ResizeObserver(callback); |
+ document.ensureResizeObserverController().addObserver(*observer); |
+ return observer; |
+} |
+ |
+ResizeObserver::ResizeObserver(ResizeObserverCallback* callback) |
+ : m_callback(callback) |
+{ |
+} |
+ |
+void ResizeObserver::observe(Element* target) |
+{ |
+ auto observerMap = target ? target->resizeObserverData() : nullptr; |
+ if (observerMap && observerMap->contains(this)) |
+ return; // Already registered. |
+ m_observations.add(new ResizeObservation(target, this)); |
+ |
+ if (FrameView* frameView = target->document().view()) |
+ frameView->scheduleAnimation(); |
+} |
+ |
+void ResizeObserver::unobserve(Element* target) |
+{ |
+ auto observerMap = target ? target->resizeObserverData() : nullptr; |
+ if (!observerMap) |
+ return; |
+ auto observation = observerMap->find(this); |
+ if (observation != observerMap->end()) { |
+ m_observations.remove((*observation).value); |
+ observerMap->remove(observation); |
+ } |
+} |
+ |
+void ResizeObserver::disconnect() |
+{ |
+ ObservationList observations; |
+ m_observations.swap(observations); |
+ |
+ for (auto observation : observations) { |
+ Element* target = (*observation).target(); |
+ if (target) |
+ target->ensureResizeObserverData().remove(this); |
+ } |
+ m_activeObservations.clear(); |
+} |
+ |
+bool ResizeObserver::gatherObservations() |
+{ |
+ DCHECK(m_activeObservations.isEmpty()); |
+ |
+ for (auto& observation : m_observations) { |
+ if (observation->hasResized()) |
+ m_activeObservations.append(*observation); |
+ } |
+ |
+ return !m_activeObservations.isEmpty(); |
+} |
+ |
+void ResizeObserver::deliverObservations() |
+{ |
+ if (m_activeObservations.size() == 0) |
+ return; |
+ |
+ HeapVector<Member<ResizeObserverEntry>> entries; |
+ |
+ for (auto& observation : m_activeObservations) { |
+ auto entry = new ResizeObserverEntry(observation->target()); |
+ entries.append(entry); |
+ observation->setBroadcastSize(entry->contentSize()); |
+ } |
+ m_callback->handleEvent(entries, this); |
+ m_activeObservations.clear(); |
+} |
+ |
+void ResizeObserver::clearObservations() |
+{ |
+ m_activeObservations.clear(); |
+} |
+ |
+DEFINE_TRACE(ResizeObserver) |
+{ |
+ visitor->trace(m_callback); |
+ visitor->trace(m_observations); |
+ visitor->trace(m_activeObservations); |
+} |
+ |
+} // namespace blink |