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27 #include "core/rendering/LayoutState.h"
29 #include "core/rendering/RenderInline.h"
30 #include "core/rendering/RenderLayer.h"
31 #include "core/rendering/RenderView.h"
32 #include "platform/Partitions.h"
36 LayoutState::LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, RenderView& view)
37 : m_isPaginated(pageLogicalHeight)
38 , m_pageLogicalHeightChanged(pageLogicalHeightChanged)
39 , m_containingBlockLogicalWidthChanged(false)
42 , m_pageLogicalHeight(pageLogicalHeight)
45 ASSERT(!view.layoutState());
46 view.pushLayoutState(*this);
49 LayoutState::LayoutState(RenderBox& renderer, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, ColumnInfo* columnInfo, bool containingBlockLogicalWidthChanged)
50 : m_containingBlockLogicalWidthChanged(containingBlockLogicalWidthChanged)
51 , m_columnInfo(columnInfo)
52 , m_next(renderer.view()->layoutState())
53 , m_renderer(renderer)
55 renderer.view()->pushLayoutState(*this);
56 bool fixed = renderer.isOutOfFlowPositioned() && renderer.style()->position() == FixedPosition;
58 // FIXME: This doesn't work correctly with transforms.
59 FloatPoint fixedOffset = renderer.view()->localToAbsolute(FloatPoint(), IsFixed);
60 m_layoutOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset;
62 m_layoutOffset = m_next->m_layoutOffset + offset;
65 if (renderer.isOutOfFlowPositioned() && !fixed) {
66 if (RenderObject* container = renderer.container()) {
67 if (container->style()->hasInFlowPosition() && container->isRenderInline())
68 m_layoutOffset += toRenderInline(container)->offsetForInFlowPositionedInline(renderer);
71 // If we establish a new page height, then cache the offset to the top of the first page.
72 // We can compare this later on to figure out what part of the page we're actually on,
73 if (pageLogicalHeight || m_columnInfo || renderer.isRenderFlowThread()) {
74 m_pageLogicalHeight = pageLogicalHeight;
75 bool isFlipped = renderer.style()->isFlippedBlocksWritingMode();
76 m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? renderer.borderLeft() + renderer.paddingLeft() : renderer.borderRight() + renderer.paddingRight()),
77 m_layoutOffset.height() + (!isFlipped ? renderer.borderTop() + renderer.paddingTop() : renderer.borderBottom() + renderer.paddingBottom()));
78 m_pageLogicalHeightChanged = pageLogicalHeightChanged;
81 // If we don't establish a new page height, then propagate the old page height and offset down.
82 m_pageLogicalHeight = m_next->m_pageLogicalHeight;
83 m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
84 m_pageOffset = m_next->m_pageOffset;
86 // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto, inline blocks and
87 // writing mode roots.
88 if (renderer.isUnsplittableForPagination()) {
89 m_pageLogicalHeight = 0;
90 m_isPaginated = false;
92 m_isPaginated = m_pageLogicalHeight || m_next->m_columnInfo || renderer.flowThreadContainingBlock();
97 m_columnInfo = m_next->m_columnInfo;
99 // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
102 LayoutState::LayoutState(RenderObject& root)
103 : m_isPaginated(false)
104 , m_pageLogicalHeightChanged(false)
105 , m_containingBlockLogicalWidthChanged(false)
107 , m_next(root.view()->layoutState())
108 , m_pageLogicalHeight(0)
111 // FIXME: Why does RenderTableSection create this wonky LayoutState?
112 ASSERT(!m_next || root.isTableSection());
113 // We'll end up pushing in RenderView itself, so don't bother adding it.
114 if (root.isRenderView())
117 root.view()->pushLayoutState(*this);
119 RenderObject* container = root.container();
120 FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), UseTransforms);
121 m_layoutOffset = LayoutSize(absContentPoint.x(), absContentPoint.y());
124 LayoutState::~LayoutState()
126 if (m_renderer.view()->layoutState()) {
127 ASSERT(m_renderer.view()->layoutState() == this);
128 m_renderer.view()->popLayoutState();
132 void LayoutState::clearPaginationInformation()
134 m_pageLogicalHeight = m_next->m_pageLogicalHeight;
135 m_pageOffset = m_next->m_pageOffset;
136 m_columnInfo = m_next->m_columnInfo;
139 LayoutUnit LayoutState::pageLogicalOffset(const RenderBox& child, const LayoutUnit& childLogicalOffset) const
141 if (child.isHorizontalWritingMode())
142 return m_layoutOffset.height() + childLogicalOffset - m_pageOffset.height();
143 return m_layoutOffset.width() + childLogicalOffset - m_pageOffset.width();
146 void LayoutState::addForcedColumnBreak(const RenderBox& child, const LayoutUnit& childLogicalOffset)
148 if (!m_columnInfo || m_columnInfo->columnHeight())
150 m_columnInfo->addForcedBreak(pageLogicalOffset(child, childLogicalOffset));