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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ViewportAnchor_h
#define ViewportAnchor_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 "wtf/RefCounted.h"
namespace blink {
class EventHandler;
class FrameView;
class Node;
// ViewportAnchor provides a way to anchor a viewport origin to a DOM node.
// In particular, the user supplies the current viewport (in CSS coordinates)
// and 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.
class ViewportAnchor {
STACK_ALLOCATED();
public:
explicit ViewportAnchor(EventHandler*);
void setAnchor(const IntRect& outerViewRect, const IntRect& innerViewRect, const FloatSize& anchorInViewCoords);
void computeOrigins(const FrameView&, const FloatSize& innerSize,
IntPoint& mainFrameOffset, FloatPoint& pinchViewportOffset) const;
private:
FloatPoint getInnerOrigin(const FloatSize& innerSize) const;
private:
RawPtrWillBeMember<EventHandler> m_eventHandler;
// Inner viewport origin in the reference frame of the document in CSS pixels
FloatPoint m_pinchViewportInDocument;
// Inner viewport origin in the reference frame of the outer viewport
// normalized to the outer viewport size.
FloatSize m_normalizedPinchViewportOffset;
RefPtrWillBeMember<Node> m_anchorNode;
LayoutRect m_anchorNodeBounds;
FloatSize m_anchorInInnerViewCoords;
FloatSize m_anchorInNodeCoords;
};
} // namespace blink
#endif
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