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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.
*/
#include "config.h"
#include "FloatAvoider.h"
#include "LayoutBox.h"
#include "LayoutElementBox.h"
#include "RenderObject.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(FloatAvoider);
// Floating boxes intersect their margin box with the other floats in the context,
// while other float avoiders (e.g. non-floating formatting context roots) intersect their border box.
FloatAvoider::FloatAvoider(LayoutPoint absoluteTopLeft, LayoutUnit borderBoxWidth, const BoxGeometry::Edges& margin, BoxGeometry::HorizontalEdges containingBlockAbsoluteContentBox, bool isFloatingPositioned, bool isStartAligned)
: m_absoluteTopLeft(absoluteTopLeft)
, m_borderBoxWidth(borderBoxWidth)
, m_margin(margin)
, m_containingBlockAbsoluteContentBox(containingBlockAbsoluteContentBox)
, m_isFloatingPositioned(isFloatingPositioned)
, m_isStartAligned(isStartAligned)
{
m_absoluteTopLeft.setX(initialInlineStart());
}
void FloatAvoider::setInlineStart(LayoutUnit inlineStart)
{
if (isStartAligned() && isFloatingBox())
inlineStart += marginStart();
if (!isStartAligned()) {
inlineStart -= borderBoxWidth();
if (isFloatingBox())
inlineStart -= marginEnd();
}
auto constrainedByContainingBlock = [&] {
// Horizontal position is constrained by the containing block's content box.
// Compute the horizontal position for the new floating by taking both the contining block and the current left/right floats into account.
if (isStartAligned())
return std::max(m_containingBlockAbsoluteContentBox.start + marginStart(), inlineStart);
// Make sure it does not overflow the containing block on the right.
return std::min(inlineStart, m_containingBlockAbsoluteContentBox.end - marginBoxWidth() + marginStart());
}();
m_absoluteTopLeft.setX(constrainedByContainingBlock);
}
void FloatAvoider::setBlockStart(LayoutUnit blockStart)
{
if (isFloatingBox())
blockStart += marginBefore();
m_absoluteTopLeft.setY(blockStart);
}
LayoutUnit FloatAvoider::initialInlineStart() const
{
if (isStartAligned())
return { m_containingBlockAbsoluteContentBox.start + marginStart() };
return { m_containingBlockAbsoluteContentBox.end - marginEnd() - borderBoxWidth() };
}
bool FloatAvoider::overflowsContainingBlock() const
{
auto left = m_absoluteTopLeft.x() - marginStart();
if (m_containingBlockAbsoluteContentBox.start > left)
return true;
auto right = left + marginBoxWidth();
return m_containingBlockAbsoluteContentBox.end < right;
}
}
}
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