96 lines
3.7 KiB
C++
96 lines
3.7 KiB
C++
/*
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* Copyright (C) 2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
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#include "FloatingState.h"
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#include "FormattingContext.h"
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#include "LayoutContainerBox.h"
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#include <wtf/IsoMalloc.h>
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namespace WebCore {
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namespace Layout {
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class FloatAvoider;
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class Box;
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class LayoutState;
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// FloatingContext is responsible for adjusting the position of a box in the current formatting context
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// by taking the floating boxes into account.
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class FloatingContext {
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WTF_MAKE_ISO_ALLOCATED(FloatingContext);
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public:
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FloatingContext(const FormattingContext&, const FloatingState&);
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const FloatingState& floatingState() const { return m_floatingState; }
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LayoutPoint positionForFloat(const Box&, const HorizontalConstraints&) const;
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LayoutPoint positionForNonFloatingFloatAvoider(const Box&, const HorizontalConstraints&) const;
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struct PositionWithClearance {
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LayoutUnit position;
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std::optional<LayoutUnit> clearance;
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};
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std::optional<PositionWithClearance> verticalPositionWithClearance(const Box&) const;
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std::optional<LayoutUnit> top() const;
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std::optional<LayoutUnit> leftBottom() const { return bottom(Clear::Left); }
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std::optional<LayoutUnit> rightBottom() const { return bottom(Clear::Right); }
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std::optional<LayoutUnit> bottom() const { return bottom(Clear::Both); }
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bool isEmpty() const { return m_floatingState.floats().isEmpty(); }
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struct Constraints {
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std::optional<PointInContextRoot> left;
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std::optional<PointInContextRoot> right;
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};
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Constraints constraints(LayoutUnit candidateTop, LayoutUnit candidateBottom) const;
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FloatingState::FloatItem toFloatItem(const Box& floatBox) const;
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private:
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std::optional<LayoutUnit> bottom(Clear) const;
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const LayoutState& layoutState() const { return m_floatingState.layoutState(); }
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const FormattingContext& formattingContext() const { return m_formattingContext; }
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const ContainerBox& root() const { return m_formattingContext.root(); }
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void findPositionForFormattingContextRoot(FloatAvoider&) const;
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struct AbsoluteCoordinateValuesForFloatAvoider;
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AbsoluteCoordinateValuesForFloatAvoider absoluteCoordinates(const Box&) const;
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LayoutPoint mapTopLeftToFloatingStateRoot(const Box&) const;
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Point mapPointFromFormattingContextRootToFloatingStateRoot(Point) const;
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const FormattingContext& m_formattingContext;
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const FloatingState& m_floatingState;
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};
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}
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}
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#endif
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