Index: third_party/WebKit/Source/core/observer/ResizeObservation.cpp |
diff --git a/third_party/WebKit/Source/core/observer/ResizeObservation.cpp b/third_party/WebKit/Source/core/observer/ResizeObservation.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..6dc277cd52b60536bcd10342ba01c2242393a34e |
--- /dev/null |
+++ b/third_party/WebKit/Source/core/observer/ResizeObservation.cpp |
@@ -0,0 +1,39 @@ |
+// 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/ResizeObservation.h" |
+ |
+#include "core/layout/LayoutBox.h" |
+#include "core/observer/ResizeObserver.h" |
+ |
+namespace blink { |
+ |
+ResizeObservation::ResizeObservation(Element* target, ResizeObserver* observer) |
+ : m_target(target) |
+ , m_observer(observer) |
+ , m_broadcastSize(0, 0) |
+{ |
+ DCHECK(m_target); |
+ m_target->ensureResizeObserverData().set(observer, this); |
+} |
+ |
+bool ResizeObservation::hasResized() const |
+{ |
+ if (!m_target) |
+ return false; |
+ LayoutBox* layout = m_target->layoutBox(); |
+ if (layout) |
+ return layout->contentSize() != m_broadcastSize; |
+ // else treat no layout as an empty rect. |
+ return !m_broadcastSize.isEmpty(); |
+} |
+ |
+DEFINE_TRACE(ResizeObservation) |
+{ |
+ visitor->trace(m_target); |
+ visitor->trace(m_observer); |
+} |
+ |
+ |
+} // namespace blink |