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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.
*
*/
#pragma once
#include "RenderBlock.h"
#include "RenderElementInlines.h"
namespace WebCore {
class LogicalSelectionOffsetCaches {
public:
class ContainingBlockInfo {
public:
ContainingBlockInfo()
: m_hasFloatsOrFragmentedFlows(false)
, m_cachedLogicalLeftSelectionOffset(false)
, m_cachedLogicalRightSelectionOffset(false)
{ }
void setBlock(RenderBlock* block, const LogicalSelectionOffsetCaches* cache, bool parentCacheHasFloatsOrFragmentedFlows = false)
{
m_block = block;
bool blockHasFloatsOrFragmentedFlows = m_block ? (m_block->containsFloats() || m_block->enclosingFragmentedFlow()) : false;
m_hasFloatsOrFragmentedFlows = parentCacheHasFloatsOrFragmentedFlows || m_hasFloatsOrFragmentedFlows || blockHasFloatsOrFragmentedFlows;
m_cache = cache;
m_cachedLogicalLeftSelectionOffset = false;
m_cachedLogicalRightSelectionOffset = false;
}
LayoutUnit logicalLeftSelectionOffset(RenderBlock& rootBlock, LayoutUnit position) const
{
ASSERT(m_cache);
if (m_hasFloatsOrFragmentedFlows || !m_cachedLogicalLeftSelectionOffset) {
m_cachedLogicalLeftSelectionOffset = true;
m_logicalLeftSelectionOffset = m_block ? m_block->logicalLeftSelectionOffset(rootBlock, position, *m_cache) : 0_lu;
} else
ASSERT(m_logicalLeftSelectionOffset == (m_block ? m_block->logicalLeftSelectionOffset(rootBlock, position, *m_cache) : 0_lu));
return m_logicalLeftSelectionOffset;
}
LayoutUnit logicalRightSelectionOffset(RenderBlock& rootBlock, LayoutUnit position) const
{
ASSERT(m_cache);
if (m_hasFloatsOrFragmentedFlows || !m_cachedLogicalRightSelectionOffset) {
m_cachedLogicalRightSelectionOffset = true;
m_logicalRightSelectionOffset = m_block ? m_block->logicalRightSelectionOffset(rootBlock, position, *m_cache) : 0_lu;
} else
ASSERT(m_logicalRightSelectionOffset == (m_block ? m_block->logicalRightSelectionOffset(rootBlock, position, *m_cache) : 0_lu));
return m_logicalRightSelectionOffset;
}
RenderBlock* block() const { return m_block; }
const LogicalSelectionOffsetCaches* cache() const { return m_cache; }
bool hasFloatsOrFragmentedFlows() const { return m_hasFloatsOrFragmentedFlows; }
private:
RenderBlock* m_block { nullptr };
const LogicalSelectionOffsetCaches* m_cache { nullptr };
bool m_hasFloatsOrFragmentedFlows : 1;
mutable bool m_cachedLogicalLeftSelectionOffset : 1;
mutable bool m_cachedLogicalRightSelectionOffset : 1;
mutable LayoutUnit m_logicalLeftSelectionOffset;
mutable LayoutUnit m_logicalRightSelectionOffset;
};
explicit LogicalSelectionOffsetCaches(RenderBlock& rootBlock)
{
#if ENABLE(TEXT_SELECTION)
// FIXME: We should either move this assertion to the caller (if applicable) or structure the code
// such that we can remove this assertion.
ASSERT(rootBlock.isSelectionRoot());
#endif
// LogicalSelectionOffsetCaches should not be used on an orphaned tree.
m_containingBlockForFixedPosition.setBlock(RenderObject::containingBlockForPositionType(PositionType::Fixed, rootBlock), nullptr);
m_containingBlockForAbsolutePosition.setBlock(RenderObject::containingBlockForPositionType(PositionType::Absolute, rootBlock), nullptr);
m_containingBlockForInflowPosition.setBlock(RenderObject::containingBlockForPositionType(PositionType::Static, rootBlock), nullptr);
}
LogicalSelectionOffsetCaches(RenderBlock& block, const LogicalSelectionOffsetCaches& cache)
: m_containingBlockForFixedPosition(cache.m_containingBlockForFixedPosition)
, m_containingBlockForAbsolutePosition(cache.m_containingBlockForAbsolutePosition)
{
if (block.canContainFixedPositionObjects())
m_containingBlockForFixedPosition.setBlock(&block, &cache, cache.m_containingBlockForFixedPosition.hasFloatsOrFragmentedFlows());
if (block.canContainAbsolutelyPositionedObjects() && !block.isRenderInline() && !block.isAnonymousBlock())
m_containingBlockForAbsolutePosition.setBlock(&block, &cache, cache.m_containingBlockForAbsolutePosition.hasFloatsOrFragmentedFlows());
m_containingBlockForInflowPosition.setBlock(&block, &cache, cache.m_containingBlockForInflowPosition.hasFloatsOrFragmentedFlows());
}
const ContainingBlockInfo& containingBlockInfo(RenderBlock& block) const
{
auto position = block.style().position();
if (position == PositionType::Fixed) {
ASSERT(block.containingBlock() == m_containingBlockForFixedPosition.block());
return m_containingBlockForFixedPosition;
}
if (position == PositionType::Absolute) {
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
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