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/*
* Copyright (C) 2019 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 "InlineFormattingQuirks.h"
#include "InlineFormattingContext.h"
#include "LayoutBoxGeometry.h"
#include "RenderStyleInlines.h"
namespace WebCore {
namespace Layout {
InlineFormattingQuirks::InlineFormattingQuirks(const InlineFormattingContext& inlineFormattingContext)
: FormattingQuirks(inlineFormattingContext)
{
}
bool InlineFormattingQuirks::trailingNonBreakingSpaceNeedsAdjustment(bool isInIntrinsicWidthMode, bool lineHasOverflow) const
{
if (isInIntrinsicWidthMode || !lineHasOverflow)
return false;
auto& rootStyle = formattingContext().root().style();
return rootStyle.nbspMode() == NBSPMode::Space && rootStyle.textWrap() != TextWrap::NoWrap && rootStyle.whiteSpaceCollapse() != WhiteSpaceCollapse::BreakSpaces;
}
InlineLayoutUnit InlineFormattingQuirks::initialLineHeight() const
{
ASSERT(!layoutState().inStandardsMode());
return 0.f;
}
bool InlineFormattingQuirks::lineBreakBoxAffectsParentInlineBox(const LineBox& lineBox)
{
// In quirks mode linebreak boxes (<br>) stop affecting the line box when (assume <br> is nested e.g. <span style="font-size: 100px"><br></span>)
// 1. the root inline box has content <div>content<br>/div>
// 2. there's at least one atomic inline level box on the line e.g <div><img><br></div> or <div><span><img></span><br></div>
// 3. there's at least one inline box with content e.g. <div><span>content</span><br></div>
if (lineBox.rootInlineBox().hasContent())
return false;
if (lineBox.hasAtomicInlineLevelBox())
return false;
// At this point we either have only the <br> on the line or inline boxes with or without content.
auto& inlineLevelBoxes = lineBox.nonRootInlineLevelBoxes();
ASSERT(!inlineLevelBoxes.isEmpty());
if (inlineLevelBoxes.size() == 1)
return true;
for (auto& inlineLevelBox : lineBox.nonRootInlineLevelBoxes()) {
// Filter out empty inline boxes e.g. <div><span></span><span></span><br></div>
if (inlineLevelBox.isInlineBox() && inlineLevelBox.hasContent())
return false;
}
return true;
}
bool InlineFormattingQuirks::inlineBoxAffectsLineBox(const InlineLevelBox& inlineLevelBox) const
{
ASSERT(!layoutState().inStandardsMode());
ASSERT(inlineLevelBox.isInlineBox());
// Inline boxes (e.g. root inline box or <span>) affects line boxes either through the strut or actual content.
if (inlineLevelBox.hasContent())
return true;
if (inlineLevelBox.isRootInlineBox()) {
// This root inline box has no direct text content and we are in non-standards mode.
// Now according to legacy line layout, we need to apply the following list-item specific quirk:
// We do not create markers for list items when the list-style-type is none, while other browsers do.
// The side effect of having no marker is that in quirks mode we have to specifically check for list-item
// and make sure it is treated as if it had content and stretched the line.
// see LegacyInlineFlowBox c'tor.
return inlineLevelBox.layoutBox().style().isOriginalDisplayListItemType();
}
// Non-root inline boxes (e.g. <span>).
auto& boxGeometry = formattingContext().geometryForBox(inlineLevelBox.layoutBox());
if (boxGeometry.horizontalBorder() || boxGeometry.horizontalPadding().value_or(0_lu)) {
// Horizontal border and padding make the inline box stretch the line (e.g. <span style="padding: 10px;"></span>).
return true;
}
return false;
}
std::optional<LayoutUnit> InlineFormattingQuirks::initialLetterAlignmentOffset(const Box& floatBox, const RenderStyle& lineBoxStyle) const
{
ASSERT(floatBox.isFloatingPositioned());
if (!floatBox.style().lineBoxContain().contains(LineBoxContain::InitialLetter))
return { };
auto& primaryFontMetrics = lineBoxStyle.fontCascade().metricsOfPrimaryFont();
auto lineHeight = [&]() -> InlineLayoutUnit {
if (lineBoxStyle.lineHeight().isNegative())
return primaryFontMetrics.ascent() + primaryFontMetrics.descent();
return lineBoxStyle.computedLineHeight();
};
auto& floatBoxGeometry = formattingContext().geometryForBox(floatBox);
return LayoutUnit { primaryFontMetrics.ascent() + (lineHeight() - primaryFontMetrics.height()) / 2 - primaryFontMetrics.capHeight() - floatBoxGeometry.marginBorderAndPaddingBefore() };
}
}
}
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