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Unified Diff: third_party/WebKit/Source/core/dom/IntersectionObserverController.cpp

Issue 1449623002: IntersectionObserver: second cut. (Closed) Base URL: https://chromium.googlesource.com/chromium/src@master
Patch Set: Add RuntimeEnabled flags to all idl's, fix test expectations. Created 4 years, 11 months ago
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Index: third_party/WebKit/Source/core/dom/IntersectionObserverController.cpp
diff --git a/third_party/WebKit/Source/core/dom/IntersectionObserverController.cpp b/third_party/WebKit/Source/core/dom/IntersectionObserverController.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b5d828231fbf1a3d044e08059b0cfab23869d274
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/IntersectionObserverController.cpp
@@ -0,0 +1,66 @@
+// 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/dom/IntersectionObserverController.h"
+
+#include "core/dom/Document.h"
+
+namespace blink {
+
+typedef HeapVector<Member<IntersectionObserver>> IntersectionObserverVector;
+
+IntersectionObserverController::IntersectionObserverController()
+ : m_timer(this, &IntersectionObserverController::deliverIntersectionObservations)
+{
+}
+
+IntersectionObserverController::~IntersectionObserverController() { }
+
+void IntersectionObserverController::scheduleIntersectionObserverForDelivery(IntersectionObserver& observer)
+{
+ // TODO(szager): use idle callback with a timeout
+ if (!m_timer.isActive())
+ m_timer.startOneShot(0, BLINK_FROM_HERE);
+ m_pendingIntersectionObservers.add(&observer);
+}
+
+void IntersectionObserverController::deliverIntersectionObservations(Timer<IntersectionObserverController>*)
+{
+ IntersectionObserverVector observers;
+ copyToVector(m_pendingIntersectionObservers, observers);
+ m_pendingIntersectionObservers.clear();
+ for (auto& observer : observers)
+ observer->deliver();
+}
+
+void IntersectionObserverController::computeTrackedIntersectionObservations()
+{
+ // TODO(szager): Need to define timestamp.
+ double timestamp = currentTime();
+ for (auto& observer : m_trackedIntersectionObservers)
+ observer->computeIntersectionObservations(timestamp);
+}
+
+void IntersectionObserverController::addTrackedObserver(IntersectionObserver& observer)
+{
+ m_trackedIntersectionObservers.add(&observer);
+}
+
+void IntersectionObserverController::removeTrackedObserversForRoot(const Element& root)
+{
+ HeapVector<Member<IntersectionObserver>> toRemove;
+ for (auto& observer : m_trackedIntersectionObservers) {
+ if (observer->root() == &root)
+ toRemove.append(observer);
+ }
+ m_trackedIntersectionObservers.removeAll(toRemove);
+}
+
+DEFINE_TRACE(IntersectionObserverController)
+{
+ visitor->trace(m_trackedIntersectionObservers);
+ visitor->trace(m_pendingIntersectionObservers);
+}
+
+} // namespace blink

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