2 * Copyright (C) 2007 Apple Inc. All rights reserved.
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5 * modification, are permitted provided that the following conditions
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27 #include "LayoutState.h"
29 #include "ColumnInfo.h"
30 #include "RenderArena.h"
31 #include "RenderInline.h"
32 #include "RenderLayer.h"
33 #include "RenderView.h"
37 LayoutState::LayoutState(LayoutState* prev, RenderBox* renderer, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, ColumnInfo* columnInfo)
38 : m_columnInfo(columnInfo)
41 , m_renderer(renderer)
46 bool fixed = renderer->isPositioned() && renderer->style()->position() == FixedPosition;
48 // FIXME: This doesn't work correctly with transforms.
49 FloatPoint fixedOffset = renderer->view()->localToAbsolute(FloatPoint(), true);
50 m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset;
52 m_paintOffset = prev->m_paintOffset + offset;
54 if (renderer->isPositioned() && !fixed) {
55 if (RenderObject* container = renderer->container()) {
56 if (container->isRelPositioned() && container->isRenderInline())
57 m_paintOffset += toRenderInline(container)->relativePositionedInlineOffset(renderer);
61 m_layoutOffset = m_paintOffset;
63 if (renderer->isRelPositioned() && renderer->hasLayer())
64 m_paintOffset += renderer->layer()->relativePositionOffset();
66 m_clipped = !fixed && prev->m_clipped;
68 m_clipRect = prev->m_clipRect;
70 if (renderer->hasOverflowClip()) {
71 RenderLayer* layer = renderer->layer();
72 LayoutRect clipRect(toPoint(m_paintOffset) + renderer->view()->layoutDelta(), layer->size());
74 m_clipRect.intersect(clipRect);
76 m_clipRect = clipRect;
80 m_paintOffset -= layer->scrolledContentOffset();
83 // If we establish a new page height, then cache the offset to the top of the first page.
84 // We can compare this later on to figure out what part of the page we're actually on,
85 if (pageLogicalHeight || m_columnInfo || renderer->isRenderFlowThread()) {
86 m_pageLogicalHeight = pageLogicalHeight;
87 m_pageOffset = LayoutSize(m_layoutOffset.width() + renderer->borderLeft() + renderer->paddingLeft(),
88 m_layoutOffset.height() + renderer->borderTop() + renderer->paddingTop());
89 m_pageLogicalHeightChanged = pageLogicalHeightChanged;
91 // If we don't establish a new page height, then propagate the old page height and offset down.
92 m_pageLogicalHeight = m_next->m_pageLogicalHeight;
93 m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
94 m_pageOffset = m_next->m_pageOffset;
96 // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto and inline blocks.
97 if (renderer->isReplaced() || renderer->hasUnsplittableScrollingOverflow())
98 m_pageLogicalHeight = 0;
102 m_columnInfo = m_next->m_columnInfo;
104 m_layoutDelta = m_next->m_layoutDelta;
106 // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
109 LayoutState::LayoutState(RenderObject* root)
111 , m_pageLogicalHeight(0)
112 , m_pageLogicalHeightChanged(false)
119 RenderObject* container = root->container();
120 FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), false, true);
121 m_paintOffset = LayoutSize(absContentPoint.x(), absContentPoint.y());
123 if (container->hasOverflowClip()) {
124 RenderLayer* layer = toRenderBoxModelObject(container)->layer();
126 m_clipRect = LayoutRect(toPoint(m_paintOffset), layer->size());
127 m_paintOffset -= layer->scrolledContentOffset();
132 static bool inLayoutStateDestroy;
135 void LayoutState::destroy(RenderArena* renderArena)
138 inLayoutStateDestroy = true;
142 inLayoutStateDestroy = false;
144 renderArena->free(*(size_t*)this, this);
147 void* LayoutState::operator new(size_t sz, RenderArena* renderArena) throw()
149 return renderArena->allocate(sz);
152 void LayoutState::operator delete(void* ptr, size_t sz)
154 ASSERT(inLayoutStateDestroy);
158 void LayoutState::clearPaginationInformation()
160 m_pageLogicalHeight = m_next->m_pageLogicalHeight;
161 m_pageOffset = m_next->m_pageOffset;
162 m_columnInfo = m_next->m_columnInfo;
165 LayoutUnit LayoutState::pageLogicalOffset(LayoutUnit childLogicalOffset) const
167 return m_layoutOffset.height() + childLogicalOffset - m_pageOffset.height();
170 void LayoutState::addForcedColumnBreak(LayoutUnit childLogicalOffset)
172 if (!m_columnInfo || m_columnInfo->columnHeight())
174 m_columnInfo->addForcedBreak(pageLogicalOffset(childLogicalOffset));
177 } // namespace WebCore