| // Copyright 2015 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. |
| |
| #ifndef ResizeViewportAnchor_h |
| #define ResizeViewportAnchor_h |
| |
| #include "platform/geometry/DoublePoint.h" |
| #include "platform/heap/Handle.h" |
| #include "web/ViewportAnchor.h" |
| |
| namespace blink { |
| |
| class FrameView; |
| class VisualViewport; |
| |
| // The resize anchor saves the current scroll offset of the visual viewport and |
| // restores to that scroll offset so that document location appears exactly |
| // unchanged to the user. |
| class ResizeViewportAnchor : public ViewportAnchor { |
| STACK_ALLOCATED(); |
| public: |
| ResizeViewportAnchor(FrameView& rootFrameView, VisualViewport&); |
| ~ResizeViewportAnchor(); |
| |
| private: |
| // Inner viewport origin in the reference frame of the root document, in CSS |
| // pixels. |
| DoublePoint m_visualViewportInDocument; |
| }; |
| |
| } // namespace blink |
| |
| #endif // ResizeViewportAnchor_h |