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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef ViewportScrollCallback_h |
| 6 #define ViewportScrollCallback_h |
| 7 |
| 8 #include "core/page/scrolling/ScrollStateCallback.h" |
| 9 #include "platform/heap/Handle.h" |
| 10 #include "platform/scroll/ScrollTypes.h" |
| 11 |
| 12 namespace blink { |
| 13 |
| 14 class Document; |
| 15 class FloatSize; |
| 16 class FrameHost; |
| 17 class Element; |
| 18 class ScrollableArea; |
| 19 class ScrollState; |
| 20 |
| 21 class ViewportScrollCallback : public ScrollStateCallback { |
| 22 public: |
| 23 ViewportScrollCallback(Document&, FrameHost&); |
| 24 ~ViewportScrollCallback(); |
| 25 |
| 26 void handleEvent(ScrollState*) override; |
| 27 |
| 28 DECLARE_VIRTUAL_TRACE(); |
| 29 |
| 30 private: |
| 31 bool shouldScrollTopControls(const FloatSize&, ScrollGranularity) const; |
| 32 ScrollableArea* getRootFrameViewport() const; |
| 33 |
| 34 WeakMember<Document> m_document; |
| 35 WeakMember<FrameHost> m_frameHost; |
| 36 |
| 37 }; |
| 38 |
| 39 } // namespace blink |
| 40 |
| 41 #endif // ViewportScrollCallback_h |
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