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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/layout/ng/mathml/ng_math_padded_layout_algorithm.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/layout/ng/mathml/ng_math_layout_utils.h"
#include "third_party/blink/renderer/core/layout/ng/ng_block_break_token.h"
#include "third_party/blink/renderer/core/layout/ng/ng_box_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/ng_out_of_flow_layout_part.h"
#include "third_party/blink/renderer/core/layout/ng/ng_physical_box_fragment.h"
#include "third_party/blink/renderer/core/mathml_names.h"
namespace blink {
NGMathPaddedLayoutAlgorithm::NGMathPaddedLayoutAlgorithm(
const NGLayoutAlgorithmParams& params)
: NGLayoutAlgorithm(params) {}
LayoutUnit NGMathPaddedLayoutAlgorithm::RequestedLSpace() const {
return std::max(LayoutUnit(),
ValueForLength(Style().GetMathLSpace(), LayoutUnit()));
}
LayoutUnit NGMathPaddedLayoutAlgorithm::RequestedVOffset() const {
return ValueForLength(Style().GetMathPaddedVOffset(), LayoutUnit());
}
base::Optional<LayoutUnit> NGMathPaddedLayoutAlgorithm::RequestedAscent(
LayoutUnit content_ascent) const {
if (Style().GetMathBaseline().IsAuto())
return base::nullopt;
return std::max(LayoutUnit(),
ValueForLength(Style().GetMathBaseline(), content_ascent));
}
base::Optional<LayoutUnit> NGMathPaddedLayoutAlgorithm::RequestedDescent(
LayoutUnit content_descent) const {
if (Style().GetMathPaddedDepth().IsAuto())
return base::nullopt;
return std::max(LayoutUnit(), ValueForLength(Style().GetMathPaddedDepth(),
content_descent));
}
void NGMathPaddedLayoutAlgorithm::GatherChildren(
NGBlockNode* content,
NGBoxFragmentBuilder* container_builder) const {
for (NGLayoutInputNode child = Node().FirstChild(); child;
child = child.NextSibling()) {
NGBlockNode block_child = To<NGBlockNode>(child);
if (child.IsOutOfFlowPositioned()) {
if (container_builder) {
container_builder->AddOutOfFlowChildCandidate(
block_child, BorderScrollbarPadding().StartOffset());
}
continue;
}
if (!*content) {
*content = block_child;
continue;
}
NOTREACHED();
}
}
scoped_refptr<const NGLayoutResult> NGMathPaddedLayoutAlgorithm::Layout() {
DCHECK(!BreakToken());
NGBlockNode content = nullptr;
GatherChildren(&content, &container_builder_);
LayoutUnit content_ascent, content_descent;
NGBoxStrut content_margins;
scoped_refptr<const NGPhysicalBoxFragment> content_fragment;
if (content) {
NGConstraintSpace constraint_space = CreateConstraintSpaceForMathChild(
Node(), ChildAvailableSize(), ConstraintSpace(), content);
scoped_refptr<const NGLayoutResult> content_layout_result =
content.Layout(constraint_space);
content_fragment =
&To<NGPhysicalBoxFragment>(content_layout_result->PhysicalFragment());
content_margins =
ComputeMarginsFor(constraint_space, content.Style(), ConstraintSpace());
NGBoxFragment fragment(ConstraintSpace().GetWritingDirection(),
*content_fragment);
content_ascent = content_margins.block_start +
fragment.Baseline().value_or(fragment.BlockSize());
content_descent =
fragment.BlockSize() + content_margins.BlockSum() - content_ascent;
}
// width/height/depth attributes can override width/ascent/descent.
LayoutUnit ascent = BorderScrollbarPadding().block_start +
RequestedAscent(content_ascent).value_or(content_ascent);
LayoutUnit descent =
RequestedDescent(content_descent).value_or(content_descent);
if (content_fragment) {
// Need to take into account border/padding, lspace and voffset.
LogicalOffset content_offset = {
BorderScrollbarPadding().inline_start + RequestedLSpace(),
(ascent - content_ascent) - RequestedVOffset()};
container_builder_.AddChild(*content_fragment, content_offset);
content.StoreMargins(ConstraintSpace(), content_margins);
}
auto total_block_size = ascent + descent + BorderScrollbarPadding().block_end;
container_builder_.SetIntrinsicBlockSize(total_block_size);
container_builder_.SetFragmentsTotalBlockSize(total_block_size);
container_builder_.SetBaseline(ascent);
NGOutOfFlowLayoutPart(Node(), ConstraintSpace(), &container_builder_).Run();
return container_builder_.ToBoxFragment();
}
MinMaxSizesResult NGMathPaddedLayoutAlgorithm::ComputeMinMaxSizes(
const MinMaxSizesInput& input) const {
if (auto result = CalculateMinMaxSizesIgnoringChildren(
Node(), BorderScrollbarPadding()))
return *result;
MinMaxSizes sizes;
bool depends_on_percentage_block_size = false;
sizes += BorderScrollbarPadding().InlineSum();
NGBlockNode content = nullptr;
GatherChildren(&content);
MinMaxSizesResult content_result =
ComputeMinAndMaxContentContribution(Style(), content, input);
NGBoxStrut content_margins = ComputeMinMaxMargins(Style(), content);
content_result.sizes += content_margins.InlineSum();
depends_on_percentage_block_size |=
content_result.depends_on_percentage_block_size;
sizes += content_result.sizes;
return {sizes, depends_on_percentage_block_size};
}
} // namespace blink
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