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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 "LayoutBox.h"
#include "LayoutContainer.h"
#include <wtf/IsoMalloc.h>
#include <wtf/Ref.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
namespace Layout {
class FormattingState;
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 Box& formattingContextRoot) { return adoptRef(*new FloatingState(layoutState, formattingContextRoot)); }
void append(const Box& layoutBox);
void remove(const Box& layoutBox);
bool isEmpty() const { return m_floats.isEmpty(); }
const Box& root() const { return *m_formattingContextRoot; }
Optional<PositionInContextRoot> top(const Box& formattingContextRoot) const;
Optional<PositionInContextRoot> leftBottom(const Box& formattingContextRoot) const;
Optional<PositionInContextRoot> rightBottom(const Box& formattingContextRoot) const;
Optional<PositionInContextRoot> bottom(const Box& formattingContextRoot) const;
struct Constraints {
Optional<PositionInContextRoot> left;
Optional<PositionInContextRoot> right;
};
Constraints constraints(PositionInContextRoot verticalPosition, const Box& formattingContextRoot) const;
class FloatItem {
public:
FloatItem(const Box&, const FloatingState&);
bool operator==(const Box& layoutBox) const { return m_layoutBox.get() == &layoutBox; }
bool isLeftPositioned() const { return m_layoutBox->isLeftFloatingPositioned(); }
bool isDescendantOfFormattingRoot(const Box&) const;
Display::Box::Rect rectWithMargin() const { return m_absoluteDisplayBox.rectWithMargin(); }
PositionInContextRoot bottom() const { return { m_absoluteDisplayBox.bottom() }; }
private:
WeakPtr<const Box> m_layoutBox;
Display::Box m_absoluteDisplayBox;
};
using FloatList = Vector<FloatItem>;
const FloatList& floats() const { return m_floats; }
const FloatItem* last() const { return isEmpty() ? nullptr : &m_floats.last(); }
private:
friend class FloatingContext;
FloatingState(LayoutState&, const Box& formattingContextRoot);
LayoutState& layoutState() const { return m_layoutState; }
Optional<PositionInContextRoot> bottom(const Box& formattingContextRoot, Clear) const;
LayoutState& m_layoutState;
WeakPtr<const Box> m_formattingContextRoot;
FloatList m_floats;
};
inline Optional<PositionInContextRoot> FloatingState::leftBottom(const Box& formattingContextRoot) const
{
ASSERT(formattingContextRoot.establishesFormattingContext());
return bottom(formattingContextRoot, Clear::Left);
}
inline Optional<PositionInContextRoot> FloatingState::rightBottom(const Box& formattingContextRoot) const
{
ASSERT(formattingContextRoot.establishesFormattingContext());
return bottom(formattingContextRoot, Clear::Right);
}
inline Optional<PositionInContextRoot> FloatingState::bottom(const Box& formattingContextRoot) const
{
ASSERT(formattingContextRoot.establishesFormattingContext());
return bottom(formattingContextRoot, Clear::Both);
}
inline bool FloatingState::FloatItem::isDescendantOfFormattingRoot(const Box& formattingContextRoot) const
{
ASSERT(formattingContextRoot.establishesFormattingContext());
if (!is<Container>(formattingContextRoot))
return false;
return m_layoutBox->isDescendantOf(downcast<Container>(formattingContextRoot));
}
}
}
#endif