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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 "LayoutBox.h"
#include "LayoutBoxGeometry.h"
#include "LayoutPoint.h"
#include "LayoutUnits.h"
#include <wtf/IsoMalloc.h>
namespace WebCore {
namespace Layout {
class FloatAvoider {
WTF_MAKE_ISO_ALLOCATED(FloatAvoider);
public:
FloatAvoider(LayoutPoint absoluteTopLeft, LayoutUnit borderBoxWidth, const Edges& margin, HorizontalEdges containingBlockAbsoluteContentBox, bool isFloatingPositioned, bool isLeftAligned);
virtual ~FloatAvoider() = default;
void setHorizontalPosition(LayoutUnit);
void setVerticalPosition(LayoutUnit);
void resetHorizontalPosition() { m_absoluteTopLeft.setX(initialHorizontalPosition()); }
bool overflowsContainingBlock() const;
LayoutUnit top() const;
LayoutUnit left() const;
LayoutUnit right() const;
bool isLeftAligned() const { return m_isLeftAligned; }
private:
LayoutUnit borderBoxWidth() const { return m_borderBoxWidth; }
LayoutUnit initialHorizontalPosition() const;
LayoutUnit marginBefore() const { return m_margin.vertical.top; }
LayoutUnit marginAfter() const { return m_margin.vertical.bottom; }
LayoutUnit marginStart() const { return m_margin.horizontal.left; }
LayoutUnit marginEnd() const { return m_margin.horizontal.right; }
LayoutUnit marginBoxWidth() const { return marginStart() + borderBoxWidth() + marginEnd(); }
bool isFloatingBox() const { return m_isFloatingPositioned; }
private:
// These coordinate values are relative to the formatting root's border box.
LayoutPoint m_absoluteTopLeft;
// Note that float avoider should work with no height value.
LayoutUnit m_borderBoxWidth;
Edges m_margin;
HorizontalEdges m_containingBlockAbsoluteContentBox;
bool m_isFloatingPositioned { true };
bool m_isLeftAligned { true };
};
inline LayoutUnit FloatAvoider::top() const
{
auto top = m_absoluteTopLeft.y();
if (isFloatingBox())
top -= marginBefore();
return top;
}
inline LayoutUnit FloatAvoider::left() const
{
auto left = m_absoluteTopLeft.x();
if (isFloatingBox())
left -= marginStart();
return left;
}
inline LayoutUnit FloatAvoider::right() const
{
auto right = left() + borderBoxWidth();
if (isFloatingBox())
right += marginEnd();
return right;
}
}
}
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