132 lines
6.1 KiB
C++
132 lines
6.1 KiB
C++
/*
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* Copyright (C) 2013 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#pragma once
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#include "RenderBlock.h"
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namespace WebCore {
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class LogicalSelectionOffsetCaches {
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public:
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class ContainingBlockInfo {
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public:
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ContainingBlockInfo()
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: m_hasFloatsOrFragmentedFlows(false)
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, m_cachedLogicalLeftSelectionOffset(false)
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, m_cachedLogicalRightSelectionOffset(false)
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{ }
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void setBlock(RenderBlock* block, const LogicalSelectionOffsetCaches* cache, bool parentCacheHasFloatsOrFragmentedFlows = false)
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{
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m_block = block;
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bool blockHasFloatsOrFragmentedFlows = m_block ? (m_block->containsFloats() || m_block->enclosingFragmentedFlow()) : false;
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m_hasFloatsOrFragmentedFlows = parentCacheHasFloatsOrFragmentedFlows || m_hasFloatsOrFragmentedFlows || blockHasFloatsOrFragmentedFlows;
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m_cache = cache;
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m_cachedLogicalLeftSelectionOffset = false;
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m_cachedLogicalRightSelectionOffset = false;
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}
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LayoutUnit logicalLeftSelectionOffset(RenderBlock& rootBlock, LayoutUnit position) const
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{
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ASSERT(m_cache);
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if (m_hasFloatsOrFragmentedFlows || !m_cachedLogicalLeftSelectionOffset) {
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m_cachedLogicalLeftSelectionOffset = true;
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m_logicalLeftSelectionOffset = m_block ? m_block->logicalLeftSelectionOffset(rootBlock, position, *m_cache) : 0_lu;
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} else
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ASSERT(m_logicalLeftSelectionOffset == (m_block ? m_block->logicalLeftSelectionOffset(rootBlock, position, *m_cache) : 0_lu));
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return m_logicalLeftSelectionOffset;
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}
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LayoutUnit logicalRightSelectionOffset(RenderBlock& rootBlock, LayoutUnit position) const
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{
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ASSERT(m_cache);
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if (m_hasFloatsOrFragmentedFlows || !m_cachedLogicalRightSelectionOffset) {
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m_cachedLogicalRightSelectionOffset = true;
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m_logicalRightSelectionOffset = m_block ? m_block->logicalRightSelectionOffset(rootBlock, position, *m_cache) : 0_lu;
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} else
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ASSERT(m_logicalRightSelectionOffset == (m_block ? m_block->logicalRightSelectionOffset(rootBlock, position, *m_cache) : 0_lu));
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return m_logicalRightSelectionOffset;
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}
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RenderBlock* block() const { return m_block; }
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const LogicalSelectionOffsetCaches* cache() const { return m_cache; }
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bool hasFloatsOrFragmentedFlows() const { return m_hasFloatsOrFragmentedFlows; }
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private:
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RenderBlock* m_block { nullptr };
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const LogicalSelectionOffsetCaches* m_cache { nullptr };
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bool m_hasFloatsOrFragmentedFlows : 1;
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mutable bool m_cachedLogicalLeftSelectionOffset : 1;
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mutable bool m_cachedLogicalRightSelectionOffset : 1;
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mutable LayoutUnit m_logicalLeftSelectionOffset;
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mutable LayoutUnit m_logicalRightSelectionOffset;
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};
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explicit LogicalSelectionOffsetCaches(RenderBlock& rootBlock)
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{
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#if ENABLE(TEXT_SELECTION)
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// FIXME: We should either move this assertion to the caller (if applicable) or structure the code
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// such that we can remove this assertion.
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ASSERT(rootBlock.isSelectionRoot());
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#endif
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// LogicalSelectionOffsetCaches should not be used on an orphaned tree.
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m_containingBlockForFixedPosition.setBlock(rootBlock.containingBlockForFixedPosition(), nullptr);
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m_containingBlockForAbsolutePosition.setBlock(rootBlock.containingBlockForAbsolutePosition(), nullptr);
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m_containingBlockForInflowPosition.setBlock(rootBlock.containingBlockForObjectInFlow(), nullptr);
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}
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LogicalSelectionOffsetCaches(RenderBlock& block, const LogicalSelectionOffsetCaches& cache)
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: m_containingBlockForFixedPosition(cache.m_containingBlockForFixedPosition)
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, m_containingBlockForAbsolutePosition(cache.m_containingBlockForAbsolutePosition)
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{
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if (block.canContainFixedPositionObjects())
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m_containingBlockForFixedPosition.setBlock(&block, &cache, cache.m_containingBlockForFixedPosition.hasFloatsOrFragmentedFlows());
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if (block.canContainAbsolutelyPositionedObjects() && !block.isRenderInline() && !block.isAnonymousBlock())
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m_containingBlockForAbsolutePosition.setBlock(&block, &cache, cache.m_containingBlockForAbsolutePosition.hasFloatsOrFragmentedFlows());
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m_containingBlockForInflowPosition.setBlock(&block, &cache, cache.m_containingBlockForInflowPosition.hasFloatsOrFragmentedFlows());
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}
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const ContainingBlockInfo& containingBlockInfo(RenderBlock& block) const
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{
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auto position = block.style().position();
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if (position == PositionType::Fixed) {
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ASSERT(block.containingBlock() == m_containingBlockForFixedPosition.block());
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return m_containingBlockForFixedPosition;
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}
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if (position == PositionType::Absolute) {
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ASSERT(block.containingBlock() == m_containingBlockForAbsolutePosition.block());
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return m_containingBlockForAbsolutePosition;
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}
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ASSERT(block.containingBlock() == m_containingBlockForInflowPosition.block());
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return m_containingBlockForInflowPosition;
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}
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private:
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ContainingBlockInfo m_containingBlockForFixedPosition;
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ContainingBlockInfo m_containingBlockForAbsolutePosition;
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ContainingBlockInfo m_containingBlockForInflowPosition;
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};
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} // namespace WebCore
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