| /* |
| * Copyright (C) 2007 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. ``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 |
| * 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 "core/layout/LayoutState.h" |
| |
| #include "core/layout/LayoutFlowThread.h" |
| #include "core/layout/LayoutInline.h" |
| #include "core/layout/LayoutView.h" |
| |
| namespace blink { |
| |
| LayoutState::LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, LayoutView& view) |
| : m_isPaginated(pageLogicalHeight) |
| , m_pageLogicalHeightChanged(pageLogicalHeightChanged) |
| , m_containingBlockLogicalWidthChanged(false) |
| , m_flowThread(nullptr) |
| , m_next(nullptr) |
| , m_pageLogicalHeight(pageLogicalHeight) |
| , m_layoutObject(view) |
| { |
| ASSERT(!view.layoutState()); |
| view.pushLayoutState(*this); |
| } |
| |
| LayoutState::LayoutState(LayoutBox& layoutObject, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, bool containingBlockLogicalWidthChanged) |
| : m_containingBlockLogicalWidthChanged(containingBlockLogicalWidthChanged) |
| , m_next(layoutObject.view()->layoutState()) |
| , m_layoutObject(layoutObject) |
| { |
| if (layoutObject.isLayoutFlowThread()) |
| m_flowThread = toLayoutFlowThread(&layoutObject); |
| else if (!layoutObject.isOutOfFlowPositioned() && !layoutObject.isColumnSpanAll()) |
| m_flowThread = m_next->flowThread(); |
| else |
| m_flowThread = nullptr; |
| layoutObject.view()->pushLayoutState(*this); |
| bool fixed = layoutObject.isOutOfFlowPositioned() && layoutObject.style()->position() == FixedPosition; |
| if (fixed) { |
| // FIXME: This doesn't work correctly with transforms. |
| FloatPoint fixedOffset = layoutObject.view()->localToAbsolute(FloatPoint(), IsFixed); |
| m_layoutOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset; |
| } else { |
| m_layoutOffset = m_next->m_layoutOffset + offset; |
| } |
| |
| if (layoutObject.isOutOfFlowPositioned() && !fixed) { |
| if (LayoutObject* container = layoutObject.container()) { |
| if (container->style()->hasInFlowPosition() && container->isLayoutInline()) |
| m_layoutOffset += toLayoutInline(container)->offsetForInFlowPositionedInline(layoutObject); |
| } |
| } |
| // If we establish a new page height, then cache the offset to the top of the first page. |
| // We can compare this later on to figure out what part of the page we're actually on, |
| if (pageLogicalHeight || layoutObject.isLayoutFlowThread()) { |
| m_pageLogicalHeight = pageLogicalHeight; |
| bool isFlipped = layoutObject.style()->isFlippedBlocksWritingMode(); |
| m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? layoutObject.borderLeft() + layoutObject.paddingLeft() : layoutObject.borderRight() + layoutObject.paddingRight()), |
| m_layoutOffset.height() + (!isFlipped ? layoutObject.borderTop() + layoutObject.paddingTop() : layoutObject.borderBottom() + layoutObject.paddingBottom())); |
| m_pageLogicalHeightChanged = pageLogicalHeightChanged; |
| m_isPaginated = true; |
| } else if (m_layoutObject.isSVG() && !m_layoutObject.isSVGRoot()) { |
| // Pagination inside SVG is not allowed. |
| m_flowThread = nullptr; |
| m_pageLogicalHeightChanged = false; |
| m_isPaginated = false; |
| } else { |
| // If we don't establish a new page height, then propagate the old page height and offset down. |
| m_pageLogicalHeight = m_next->m_pageLogicalHeight; |
| m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged; |
| m_pageOffset = m_next->m_pageOffset; |
| |
| // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto, inline blocks and |
| // writing mode roots. |
| if (layoutObject.paginationBreakability() == LayoutBox::ForbidBreaks) { |
| m_flowThread = nullptr; |
| m_pageLogicalHeight = 0; |
| m_isPaginated = false; |
| } else { |
| m_isPaginated = m_pageLogicalHeight || m_flowThread; |
| } |
| } |
| |
| // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present. |
| } |
| |
| LayoutState::LayoutState(LayoutObject& root) |
| : m_isPaginated(false) |
| , m_pageLogicalHeightChanged(false) |
| , m_containingBlockLogicalWidthChanged(false) |
| , m_flowThread(nullptr) |
| , m_next(root.view()->layoutState()) |
| , m_pageLogicalHeight(0) |
| , m_layoutObject(root) |
| { |
| ASSERT(!m_next); |
| // We'll end up pushing in LayoutView itself, so don't bother adding it. |
| if (root.isLayoutView()) |
| return; |
| |
| root.view()->pushLayoutState(*this); |
| |
| LayoutObject* container = root.container(); |
| FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), UseTransforms); |
| m_layoutOffset = LayoutSize(absContentPoint.x(), absContentPoint.y()); |
| } |
| |
| LayoutState::~LayoutState() |
| { |
| if (m_layoutObject.view()->layoutState()) { |
| ASSERT(m_layoutObject.view()->layoutState() == this); |
| m_layoutObject.view()->popLayoutState(); |
| } |
| } |
| |
| LayoutUnit LayoutState::pageLogicalOffset(const LayoutBox& child, const LayoutUnit& childLogicalOffset) const |
| { |
| if (child.isHorizontalWritingMode()) |
| return m_layoutOffset.height() + childLogicalOffset - m_pageOffset.height(); |
| return m_layoutOffset.width() + childLogicalOffset - m_pageOffset.width(); |
| } |
| |
| } // namespace blink |