| /* |
| * Copyright (C) 2012 Apple 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: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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. |
| */ |
| |
| #include "config.h" |
| #include "ScrollingConstraints.h" |
| |
| #include <wtf/text/TextStream.h> |
| |
| namespace WebCore { |
| |
| FloatPoint FixedPositionViewportConstraints::layerPositionForViewportRect(const FloatRect& viewportRect) const |
| { |
| FloatSize offset; |
| |
| if (hasAnchorEdge(AnchorEdgeLeft)) |
| offset.setWidth(viewportRect.x() - m_viewportRectAtLastLayout.x()); |
| else if (hasAnchorEdge(AnchorEdgeRight)) |
| offset.setWidth(viewportRect.maxX() - m_viewportRectAtLastLayout.maxX()); |
| |
| if (hasAnchorEdge(AnchorEdgeTop)) |
| offset.setHeight(viewportRect.y() - m_viewportRectAtLastLayout.y()); |
| else if (hasAnchorEdge(AnchorEdgeBottom)) |
| offset.setHeight(viewportRect.maxY() - m_viewportRectAtLastLayout.maxY()); |
| |
| return m_layerPositionAtLastLayout + offset; |
| } |
| |
| FloatSize StickyPositionViewportConstraints::computeStickyOffset(const FloatRect& constrainingRect) const |
| { |
| FloatRect boxRect = m_stickyBoxRect; |
| |
| if (hasAnchorEdge(AnchorEdgeRight)) { |
| float rightLimit = constrainingRect.maxX() - m_rightOffset; |
| float rightDelta = std::min<float>(0, rightLimit - m_stickyBoxRect.maxX()); |
| float availableSpace = std::min<float>(0, m_containingBlockRect.x() - m_stickyBoxRect.x()); |
| if (rightDelta < availableSpace) |
| rightDelta = availableSpace; |
| |
| boxRect.move(rightDelta, 0); |
| } |
| |
| if (hasAnchorEdge(AnchorEdgeLeft)) { |
| float leftLimit = constrainingRect.x() + m_leftOffset; |
| float leftDelta = std::max<float>(0, leftLimit - m_stickyBoxRect.x()); |
| float availableSpace = std::max<float>(0, m_containingBlockRect.maxX() - m_stickyBoxRect.maxX()); |
| if (leftDelta > availableSpace) |
| leftDelta = availableSpace; |
| |
| boxRect.move(leftDelta, 0); |
| } |
| |
| if (hasAnchorEdge(AnchorEdgeBottom)) { |
| float bottomLimit = constrainingRect.maxY() - m_bottomOffset; |
| float bottomDelta = std::min<float>(0, bottomLimit - m_stickyBoxRect.maxY()); |
| float availableSpace = std::min<float>(0, m_containingBlockRect.y() - m_stickyBoxRect.y()); |
| if (bottomDelta < availableSpace) |
| bottomDelta = availableSpace; |
| |
| boxRect.move(0, bottomDelta); |
| } |
| |
| if (hasAnchorEdge(AnchorEdgeTop)) { |
| float topLimit = constrainingRect.y() + m_topOffset; |
| float topDelta = std::max<float>(0, topLimit - m_stickyBoxRect.y()); |
| float availableSpace = std::max<float>(0, m_containingBlockRect.maxY() - m_stickyBoxRect.maxY()); |
| if (topDelta > availableSpace) |
| topDelta = availableSpace; |
| |
| boxRect.move(0, topDelta); |
| } |
| |
| return boxRect.location() - m_stickyBoxRect.location(); |
| } |
| |
| FloatPoint StickyPositionViewportConstraints::layerPositionForConstrainingRect(const FloatRect& constrainingRect) const |
| { |
| FloatSize offset = computeStickyOffset(constrainingRect); |
| return m_layerPositionAtLastLayout + offset - m_stickyOffsetAtLastLayout; |
| } |
| |
| TextStream& operator<<(TextStream& ts, const FixedPositionViewportConstraints& constraints) |
| { |
| ts.dumpProperty("viewport-rect-at-last-layout", constraints.viewportRectAtLastLayout()); |
| ts.dumpProperty("layer-position-at-last-layout", constraints.layerPositionAtLastLayout()); |
| |
| return ts; |
| } |
| |
| TextStream& operator<<(TextStream& ts, const StickyPositionViewportConstraints& constraints) |
| { |
| ts.dumpProperty("sticky-position-at-last-layout", constraints.stickyOffsetAtLastLayout()); |
| ts.dumpProperty("layer-position-at-last-layout", constraints.layerPositionAtLastLayout()); |
| |
| return ts; |
| } |
| |
| } // namespace WebCore |