| /* |
| * 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 IntSize; |
| 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& viewRect, const FloatSize& anchorInViewCoords); |
| |
| IntPoint computeOrigin(const IntSize& currentViewSize) const; |
| |
| private: |
| RawPtrWillBeMember<EventHandler> m_eventHandler; |
| |
| IntRect m_viewRect; |
| |
| RefPtrWillBeMember<Node> m_anchorNode; |
| LayoutRect m_anchorNodeBounds; |
| |
| FloatSize m_anchorInViewCoords; |
| FloatSize m_anchorInNodeCoords; |
| }; |
| |
| } // namespace blink |
| |
| #endif |