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