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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef LogicalSelectionOffsetCaches_h
#define LogicalSelectionOffsetCaches_h
#include "RenderBlock.h"
namespace WebCore {
static inline bool isContainingBlockCandidateForAbsolutelyPositionedObject(RenderObject* object)
{
return object->style()->position() != StaticPosition
|| (object->hasTransform() && object->isRenderBlock())
#if ENABLE(SVG)
|| object->isSVGForeignObject()
#endif
|| object->isRenderView();
}
static inline bool isNonRenderBlockInline(RenderObject* object)
{
return (object->isInline() && !object->isReplaced()) || !object->isRenderBlock();
}
static inline RenderObject* containingBlockForFixedPosition(RenderObject* parent)
{
RenderObject* object = parent;
while (object && !object->canContainFixedPositionObjects())
object = object->parent();
ASSERT(!object || !object->isAnonymousBlock());
return object;
}
static inline RenderObject* containingBlockForAbsolutePosition(RenderObject* parent)
{
RenderObject* object = parent;
while (object && !isContainingBlockCandidateForAbsolutelyPositionedObject(object))
object = object->parent();
// For a relatively positioned inline, return its nearest non-anonymous containing block,
// not the inline itself, to avoid having a positioned objects list in all RenderInlines
// and use RenderBlock* as RenderObject::containingBlock's return type.
// Use RenderBlock::container() to obtain the inline.
if (object && object->isRenderInline())
object = object->containingBlock();
while (object && object->isAnonymousBlock())
object = object->containingBlock();
return object;
}
static inline RenderObject* containingBlockForObjectInFlow(RenderObject* parent)
{
RenderObject* object = parent;
while (object && isNonRenderBlockInline(object))
object = object->parent();
return object;
}
class LogicalSelectionOffsetCaches {
public:
class ContainingBlockInfo {
public:
ContainingBlockInfo()
: m_block(0)
, m_cache(0)
, m_hasFloatsOrFlowThreads(false)
, m_cachedLogicalLeftSelectionOffset(false)
, m_cachedLogicalRightSelectionOffset(false)
{ }
void setBlock(RenderBlock* block, const LogicalSelectionOffsetCaches* cache)
{
m_block = block;
m_hasFloatsOrFlowThreads = m_hasFloatsOrFlowThreads || m_block->containsFloats() || m_block->flowThreadContainingBlock();
m_cache = cache;
m_cachedLogicalLeftSelectionOffset = false;
m_cachedLogicalRightSelectionOffset = false;
}
RenderBlock* block() const { return m_block; }
const LogicalSelectionOffsetCaches* cache() const { return m_cache; }
LayoutUnit logicalLeftSelectionOffset(RenderBlock* rootBlock, LayoutUnit position) const
{
ASSERT(m_cache);
if (m_hasFloatsOrFlowThreads || !m_cachedLogicalLeftSelectionOffset) {
m_cachedLogicalLeftSelectionOffset = true;
m_logicalLeftSelectionOffset = m_block->logicalLeftSelectionOffset(rootBlock, position, *m_cache);
} else
ASSERT(m_logicalLeftSelectionOffset == m_block->logicalLeftSelectionOffset(rootBlock, position, *m_cache));
return m_logicalLeftSelectionOffset;
}
LayoutUnit logicalRightSelectionOffset(RenderBlock* rootBlock, LayoutUnit position) const
{
ASSERT(m_cache);
if (m_hasFloatsOrFlowThreads || !m_cachedLogicalRightSelectionOffset) {
m_cachedLogicalRightSelectionOffset = true;
m_logicalRightSelectionOffset = m_block->logicalRightSelectionOffset(rootBlock, position, *m_cache);
} else
ASSERT(m_logicalRightSelectionOffset == m_block->logicalRightSelectionOffset(rootBlock, position, *m_cache));
return m_logicalRightSelectionOffset;
}
private:
RenderBlock* m_block;
const LogicalSelectionOffsetCaches* m_cache;
bool m_hasFloatsOrFlowThreads : 1;
mutable bool m_cachedLogicalLeftSelectionOffset : 1;
mutable bool m_cachedLogicalRightSelectionOffset : 1;
mutable LayoutUnit m_logicalLeftSelectionOffset;
mutable LayoutUnit m_logicalRightSelectionOffset;
};
LogicalSelectionOffsetCaches(RenderBlock* rootBlock)
{
ASSERT(rootBlock->isSelectionRoot());
RenderObject* parent = rootBlock->parent();
// LogicalSelectionOffsetCaches should not be used on an orphaned tree.
m_containingBlockForFixedPosition.setBlock(toRenderBlock(containingBlockForFixedPosition(parent)), 0);
m_containingBlockForAbsolutePosition.setBlock(toRenderBlock(containingBlockForAbsolutePosition(parent)), 0);
m_containingBlockForInflowPosition.setBlock(toRenderBlock(containingBlockForObjectInFlow(parent)), 0);
}
LogicalSelectionOffsetCaches(RenderBlock* block, const LogicalSelectionOffsetCaches& cache)
: m_containingBlockForFixedPosition(cache.m_containingBlockForFixedPosition)
, m_containingBlockForAbsolutePosition(cache.m_containingBlockForAbsolutePosition)
{
if (block->canContainFixedPositionObjects())
m_containingBlockForFixedPosition.setBlock(block, &cache);
if (isContainingBlockCandidateForAbsolutelyPositionedObject(block) && !block->isRenderInline() && !block->isAnonymousBlock())
m_containingBlockForFixedPosition.setBlock(block, &cache);
m_containingBlockForInflowPosition.setBlock(block, &cache);
}
const ContainingBlockInfo& containingBlockInfo(RenderBlock* block) const
{
EPosition position = block->style()->position();
if (position == FixedPosition) {
ASSERT(block->containingBlock() == m_containingBlockForFixedPosition.block());
return m_containingBlockForFixedPosition;
}
if (position == AbsolutePosition) {
ASSERT(block->containingBlock() == m_containingBlockForAbsolutePosition.block());
return m_containingBlockForAbsolutePosition;
}
ASSERT(block->containingBlock() == m_containingBlockForInflowPosition.block());
return m_containingBlockForInflowPosition;
}
private:
ContainingBlockInfo m_containingBlockForFixedPosition;
ContainingBlockInfo m_containingBlockForAbsolutePosition;
ContainingBlockInfo m_containingBlockForInflowPosition;
};
} // namespace WebCore
#endif // LogicalSelectionOffsetCaches_h
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