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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 "LayoutBoxGeometry.h"
#include "LayoutElementBox.h"
#include "LayoutShape.h"
#include <wtf/OptionSet.h>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
namespace Layout {
class Box;
class BoxGeometry;
class Rect;
// PlacedFloats are relative to the BFC's logical top/left.
// When floats added by nested IFCs with mismatching inline direcctions (e.g. where BFC is RTL but IFC is RTL)
// they get converted as if they had the same inline direction as BFC. What it simply means that
// PlacedFloats::Item::isStartPositioned is always relative to BFC, regardless of what it is relative to in its IFC.
class PlacedFloats {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(PlacedFloats);
public:
PlacedFloats(const ElementBox& blockFormattingContextRoot);
const ElementBox& blockFormattingContextRoot() const { return m_blockFormattingContextRoot; }
class Item {
public:
// FIXME: This c'tor is only used by the render tree integation codepath.
enum class Position { Start, End };
Item(Position, const BoxGeometry& absoluteBoxGeometry, LayoutPoint localTopLeft, const LayoutShape*);
Item(const Box&, Position, const BoxGeometry& absoluteBoxGeometry, LayoutPoint localTopLeft, std::optional<size_t> line);
~Item();
bool isStartPositioned() const { return m_position == Position::Start; }
bool isEndPositioned() const { return m_position == Position::End; }
bool isInFormattingContextOf(const ElementBox& formattingContextRoot) const;
BoxGeometry boxGeometry() const;
Rect absoluteRectWithMargin() const { return BoxGeometry::marginBoxRect(m_absoluteBoxGeometry); }
Rect absoluteBorderBoxRect() const { return BoxGeometry::borderBoxRect(m_absoluteBoxGeometry); }
BoxGeometry::HorizontalEdges inlineAxisMargin() const { return m_absoluteBoxGeometry.horizontalMargin(); }
PositionInContextRoot absoluteBottom() const { return { absoluteRectWithMargin().bottom() }; }
const LayoutShape* shape() const { return m_shape.get(); }
std::optional<size_t> placedByLine() const { return m_placedByLine; }
const Box* layoutBox() const { return m_layoutBox.get(); }
private:
CheckedPtr<const Box> m_layoutBox;
Position m_position;
BoxGeometry m_absoluteBoxGeometry;
LayoutPoint m_localTopLeft;
RefPtr<const LayoutShape> m_shape;
std::optional<size_t> m_placedByLine;
};
using List = Vector<Item>;
const List& list() const { return m_list; }
const Item* last() const { return list().isEmpty() ? nullptr : &m_list.last(); }
void append(Item);
bool remove(const Box&);
void clear();
bool isEmpty() const { return list().isEmpty(); }
bool hasStartPositioned() const;
bool hasEndPositioned() const;
std::optional<LayoutUnit> highestPositionOnBlockAxis() const;
std::optional<LayoutUnit> lowestPositionOnBlockAxis(Clear = Clear::Both) const;
void shrinkToFit();
private:
CheckedRef<const ElementBox> m_blockFormattingContextRoot;
List m_list;
enum class PositionType {
Start = 1 << 0,
End = 1 << 1
};
OptionSet<PositionType> m_positionTypes;
WritingMode m_writingMode;
};
inline bool PlacedFloats::remove(const Box& floatBox)
{
return m_list.removeFirstMatching([&floatBox](auto& placedFloatItem) {
return placedFloatItem.layoutBox() == &floatBox;
});
}
inline bool PlacedFloats::hasStartPositioned() const
{
return m_positionTypes.contains(PositionType::Start);
}
inline bool PlacedFloats::hasEndPositioned() const
{
return m_positionTypes.contains(PositionType::End);
}
}
}
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