1 /* 2 * Copyright (C) 2012 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "config.h" 27 #include "core/page/scrolling/ScrollingConstraints.h" 28 29 namespace blink { 30 31 FloatPoint FixedPositionViewportConstraints::layerPositionForViewportRect(const FloatRect& viewportRect) const 32 { 33 FloatSize offset; 34 35 if (hasAnchorEdge(AnchorEdgeLeft)) 36 offset.setWidth(viewportRect.x() - m_viewportRectAtLastLayout.x()); 37 else if (hasAnchorEdge(AnchorEdgeRight)) 38 offset.setWidth(viewportRect.maxX() - m_viewportRectAtLastLayout.maxX()); 39 40 if (hasAnchorEdge(AnchorEdgeTop)) 41 offset.setHeight(viewportRect.y() - m_viewportRectAtLastLayout.y()); 42 else if (hasAnchorEdge(AnchorEdgeBottom)) 43 offset.setHeight(viewportRect.maxY() - m_viewportRectAtLastLayout.maxY()); 44 45 return m_layerPositionAtLastLayout + offset; 46 } 47 48 } // namespace blink 49
