| // 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 RotationViewportAnchor_h |
| #define RotationViewportAnchor_h |
| |
| #include "platform/geometry/FloatSize.h" |
| #include "platform/geometry/IntPoint.h" |
| #include "platform/geometry/IntRect.h" |
| #include "platform/geometry/LayoutRect.h" |
| #include "platform/heap/Handle.h" |
| #include "web/ViewportAnchor.h" |
| |
| namespace blink { |
| |
| class FrameView; |
| class Node; |
| class PageScaleConstraintsSet; |
| class VisualViewport; |
| |
| // The rotation anchor provides a way to anchor a viewport origin to a DOM node. |
| // In particular, the user supplies an anchor point (in view coordinates, e.g., |
| // (0, 0) == viewport origin, (0.5, 0) == viewport top center). The anchor point |
| // tracks the underlying DOM node; as the node moves or the view is resized, the |
| // viewport anchor maintains its orientation relative to the node, and the |
| // viewport origin maintains its orientation relative to the anchor. If there is |
| // no node or it is lost during the resize, we fall back to the resize anchor |
| // logic. |
| class RotationViewportAnchor : public ViewportAnchor { |
| STACK_ALLOCATED(); |
| public: |
| RotationViewportAnchor(FrameView& rootFrameView, VisualViewport&, const FloatSize& anchorInInnerViewCoords, PageScaleConstraintsSet&); |
| ~RotationViewportAnchor(); |
| |
| private: |
| void setAnchor(); |
| void restoreToAnchor(); |
| |
| FloatPoint getInnerOrigin(const FloatSize& innerSize) const; |
| |
| void computeOrigins(const FloatSize& innerSize, IntPoint& mainFrameOffset, FloatPoint& visualViewportOffset) const; |
| |
| float m_oldPageScaleFactor; |
| float m_oldMinimumPageScaleFactor; |
| |
| // Inner viewport origin in the reference frame of the document in CSS pixels |
| FloatPoint m_visualViewportInDocument; |
| |
| // Inner viewport origin in the reference frame of the outer viewport |
| // normalized to the outer viewport size. |
| FloatSize m_normalizedVisualViewportOffset; |
| |
| Member<Node> m_anchorNode; |
| LayoutRect m_anchorNodeBounds; |
| |
| FloatSize m_anchorInInnerViewCoords; |
| FloatSize m_anchorInNodeCoords; |
| |
| PageScaleConstraintsSet& m_pageScaleConstraintsSet; |
| }; |
| |
| } // namespace blink |
| |
| #endif // RotationViewportAnchor_h |