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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
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
#include "DisplayBox.h"
#include "LayoutContainerBox.h"
#include <wtf/IsoMalloc.h>
#include <wtf/Ref.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
namespace Display {
class Box;
}
namespace Layout {
class Box;
class FloatingContext;
class LayoutState;
// FloatingState holds the floating boxes per formatting context.
class FloatingState : public RefCounted<FloatingState> {
WTF_MAKE_ISO_ALLOCATED(FloatingState);
public:
static Ref<FloatingState> create(LayoutState& layoutState, const ContainerBox& formattingContextRoot) { return adoptRef(*new FloatingState(layoutState, formattingContextRoot)); }
const ContainerBox& root() const { return *m_formattingContextRoot; }
Optional<PositionInContextRoot> top(const ContainerBox& formattingContextRoot) const;
Optional<PositionInContextRoot> leftBottom(const ContainerBox& formattingContextRoot) const;
Optional<PositionInContextRoot> rightBottom(const ContainerBox& formattingContextRoot) const;
Optional<PositionInContextRoot> bottom(const ContainerBox& formattingContextRoot) const;
class FloatItem {
public:
FloatItem(const Box&, Display::Box absoluteDisplayBox);
// FIXME: This c'tor is only used by the render tree integation codepath.
enum class Position { Left, Right };
FloatItem(Position, Display::Box absoluteDisplayBox);
bool isLeftPositioned() const { return m_position == Position::Left; }
bool isInFormattingContextOf(const ContainerBox& formattingContextRoot) const { return m_layoutBox->isInFormattingContextOf(formattingContextRoot); }
Display::Rect rectWithMargin() const { return m_absoluteDisplayBox.rectWithMargin(); }
UsedHorizontalMargin horizontalMargin() const { return m_absoluteDisplayBox.horizontalMargin(); }
PositionInContextRoot bottom() const { return { m_absoluteDisplayBox.bottom() }; }
#if ASSERT_ENABLED
const Box* floatBox() const { return m_layoutBox.get(); }
#endif
private:
WeakPtr<const Box> m_layoutBox;
Position m_position;
Display::Box m_absoluteDisplayBox;
};
using FloatList = Vector<FloatItem>;
const FloatList& floats() const { return m_floats; }
const FloatItem* last() const { return floats().isEmpty() ? nullptr : &m_floats.last(); }
void append(FloatItem);
void clear() { m_floats.clear(); }
private:
friend class FloatingContext;
FloatingState(LayoutState&, const ContainerBox& formattingContextRoot);
LayoutState& layoutState() const { return m_layoutState; }
Optional<PositionInContextRoot> bottom(const ContainerBox& formattingContextRoot, Clear) const;
LayoutState& m_layoutState;
WeakPtr<const ContainerBox> m_formattingContextRoot;
FloatList m_floats;
};
inline Optional<PositionInContextRoot> FloatingState::leftBottom(const ContainerBox& formattingContextRoot) const
{
ASSERT(formattingContextRoot.establishesFormattingContext());
return bottom(formattingContextRoot, Clear::Left);
}
inline Optional<PositionInContextRoot> FloatingState::rightBottom(const ContainerBox& formattingContextRoot) const
{
ASSERT(formattingContextRoot.establishesFormattingContext());
return bottom(formattingContextRoot, Clear::Right);
}
inline Optional<PositionInContextRoot> FloatingState::bottom(const ContainerBox& formattingContextRoot) const
{
ASSERT(formattingContextRoot.establishesFormattingContext());
return bottom(formattingContextRoot, Clear::Both);
}
}
}
#endif