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// Copyright 2016 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/ng_constraint_space.h"
#include <algorithm>
#include <memory>
#include "third_party/blink/renderer/core/layout/layout_block.h"
#include "third_party/blink/renderer/core/layout/layout_flexible_box.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/layout/ng/ng_constraint_space_builder.h"
#include "third_party/blink/renderer/core/layout/ng/ng_length_utils.h"
namespace blink {
NGConstraintSpace::NGConstraintSpace(
WritingMode writing_mode,
bool is_orthogonal_writing_mode_root,
TextDirection direction,
NGLogicalSize available_size,
NGLogicalSize percentage_resolution_size,
LayoutUnit parent_percentage_resolution_inline_size,
NGPhysicalSize initial_containing_block_size,
LayoutUnit fragmentainer_block_size,
LayoutUnit fragmentainer_space_at_bfc_start,
bool is_fixed_size_inline,
bool is_fixed_size_block,
bool fixed_size_block_is_definite,
bool is_shrink_to_fit,
bool is_intermediate_layout,
NGFragmentationType block_direction_fragmentation_type,
bool separate_leading_fragmentainer_margins,
bool is_new_fc,
bool is_anonymous,
bool use_first_line_style,
bool should_force_clearance,
NGFloatTypes adjoining_floats,
const NGMarginStrut& margin_strut,
const NGBfcOffset& bfc_offset,
const base::Optional<NGBfcOffset>& floats_bfc_offset,
const NGExclusionSpace& exclusion_space,
LayoutUnit clearance_offset,
Vector<NGBaselineRequest>& baseline_requests)
: available_size_(available_size),
percentage_resolution_size_(percentage_resolution_size),
parent_percentage_resolution_inline_size_(
parent_percentage_resolution_inline_size),
initial_containing_block_size_(initial_containing_block_size),
fragmentainer_block_size_(fragmentainer_block_size),
fragmentainer_space_at_bfc_start_(fragmentainer_space_at_bfc_start),
is_fixed_size_inline_(is_fixed_size_inline),
is_fixed_size_block_(is_fixed_size_block),
fixed_size_block_is_definite_(fixed_size_block_is_definite),
is_shrink_to_fit_(is_shrink_to_fit),
is_intermediate_layout_(is_intermediate_layout),
block_direction_fragmentation_type_(block_direction_fragmentation_type),
separate_leading_fragmentainer_margins_(
separate_leading_fragmentainer_margins),
is_new_fc_(is_new_fc),
is_anonymous_(is_anonymous),
use_first_line_style_(use_first_line_style),
should_force_clearance_(should_force_clearance),
adjoining_floats_(adjoining_floats),
writing_mode_(static_cast<unsigned>(writing_mode)),
is_orthogonal_writing_mode_root_(is_orthogonal_writing_mode_root),
direction_(static_cast<unsigned>(direction)),
margin_strut_(margin_strut),
bfc_offset_(bfc_offset),
floats_bfc_offset_(floats_bfc_offset),
exclusion_space_(std::make_unique<NGExclusionSpace>(exclusion_space)),
clearance_offset_(clearance_offset) {
baseline_requests_.swap(baseline_requests);
}
scoped_refptr<NGConstraintSpace> NGConstraintSpace::CreateFromLayoutObject(
const LayoutBox& box) {
auto writing_mode = box.StyleRef().GetWritingMode();
bool parallel_containing_block = IsParallelWritingMode(
box.ContainingBlock()->StyleRef().GetWritingMode(), writing_mode);
bool fixed_inline = false, fixed_block = false;
bool fixed_block_is_definite = true;
LayoutUnit available_logical_width;
if (parallel_containing_block &&
box.HasOverrideContainingBlockContentLogicalWidth()) {
// Grid layout sets OverrideContainingBlockContentLogicalWidth|Height
available_logical_width = box.OverrideContainingBlockContentLogicalWidth();
} else if (!parallel_containing_block &&
box.HasOverrideContainingBlockContentLogicalHeight()) {
available_logical_width = box.OverrideContainingBlockContentLogicalHeight();
} else {
if (parallel_containing_block)
available_logical_width = box.ContainingBlockLogicalWidthForContent();
else
available_logical_width = box.PerpendicularContainingBlockLogicalHeight();
}
available_logical_width = std::max(LayoutUnit(), available_logical_width);
LayoutUnit available_logical_height;
if (parallel_containing_block &&
box.HasOverrideContainingBlockContentLogicalHeight()) {
// Grid layout sets OverrideContainingBlockContentLogicalWidth|Height
available_logical_height =
box.OverrideContainingBlockContentLogicalHeight();
} else if (!parallel_containing_block &&
box.HasOverrideContainingBlockContentLogicalWidth()) {
available_logical_height = box.OverrideContainingBlockContentLogicalWidth();
} else {
if (!box.Parent()) {
available_logical_height = box.View()->ViewLogicalHeightForPercentages();
} else if (box.ContainingBlock()) {
if (parallel_containing_block) {
available_logical_height =
box.ContainingBlock()
->AvailableLogicalHeightForPercentageComputation();
} else {
available_logical_height = box.ContainingBlockLogicalWidthForContent();
}
}
}
NGLogicalSize percentage_size = {available_logical_width,
available_logical_height};
NGLogicalSize available_size = percentage_size;
if (box.HasOverrideLogicalWidth()) {
available_size.inline_size = box.OverrideLogicalWidth();
fixed_inline = true;
}
if (box.HasOverrideLogicalHeight()) {
available_size.block_size = box.OverrideLogicalHeight();
fixed_block = true;
}
if (box.IsFlexItem() && fixed_block) {
fixed_block_is_definite =
ToLayoutFlexibleBox(box.Parent())
->UseOverrideLogicalHeightForPerentageResolution(box);
}
bool is_new_fc = true;
// TODO(ikilpatrick): This DCHECK needs to be enabled once we've switched
// LayoutTableCell, etc over to LayoutNG.
//
// We currently need to "force" LayoutNG roots to be formatting contexts so
// that floats have layout performed on them.
//
// DCHECK(is_new_fc,
// box.IsLayoutBlock() && ToLayoutBlock(box).CreatesNewFormattingContext());
IntSize icb_size = box.View()->GetLayoutSize(kExcludeScrollbars);
NGPhysicalSize initial_containing_block_size{LayoutUnit(icb_size.Width()),
LayoutUnit(icb_size.Height())};
// ICB cannot be indefinite by the spec.
DCHECK_GE(initial_containing_block_size.width, LayoutUnit());
DCHECK_GE(initial_containing_block_size.height, LayoutUnit());
NGConstraintSpaceBuilder builder(writing_mode, initial_containing_block_size);
if (!box.IsWritingModeRoot()) {
// Add all types because we don't know which baselines will be requested.
FontBaseline baseline_type = box.StyleRef().GetFontBaseline();
bool synthesize_inline_block_baseline =
box.IsLayoutBlock() &&
ToLayoutBlock(box).UseLogicalBottomMarginEdgeForInlineBlockBaseline();
if (!synthesize_inline_block_baseline) {
builder.AddBaselineRequest(
{NGBaselineAlgorithmType::kAtomicInline, baseline_type});
}
builder.AddBaselineRequest(
{NGBaselineAlgorithmType::kFirstLine, baseline_type});
}
return builder.SetAvailableSize(available_size)
.SetPercentageResolutionSize(percentage_size)
.SetIsFixedSizeInline(fixed_inline)
.SetIsFixedSizeBlock(fixed_block)
.SetFixedSizeBlockIsDefinite(fixed_block_is_definite)
.SetIsShrinkToFit(
box.SizesLogicalWidthToFitContent(box.StyleRef().LogicalWidth()))
.SetIsNewFormattingContext(is_new_fc)
.SetTextDirection(box.StyleRef().Direction())
.ToConstraintSpace(writing_mode);
}
LayoutUnit
NGConstraintSpace::PercentageResolutionInlineSizeForParentWritingMode() const {
if (!IsOrthogonalWritingModeRoot())
return PercentageResolutionSize().inline_size;
if (PercentageResolutionSize().block_size != NGSizeIndefinite)
return PercentageResolutionSize().block_size;
if (IsHorizontalWritingMode(GetWritingMode()))
return InitialContainingBlockSize().height;
return InitialContainingBlockSize().width;
}
LayoutUnit NGConstraintSpace::ParentPercentageResolutionInlineSize() const {
if (parent_percentage_resolution_inline_size_ != NGSizeIndefinite)
return parent_percentage_resolution_inline_size_;
return initial_containing_block_size_.ConvertToLogical(GetWritingMode())
.inline_size;
}
NGFragmentationType NGConstraintSpace::BlockFragmentationType() const {
return static_cast<NGFragmentationType>(block_direction_fragmentation_type_);
}
bool NGConstraintSpace::operator==(const NGConstraintSpace& other) const {
if (exclusion_space_ && other.exclusion_space_ &&
*exclusion_space_ != *other.exclusion_space_)
return false;
return available_size_ == other.available_size_ &&
percentage_resolution_size_ == other.percentage_resolution_size_ &&
parent_percentage_resolution_inline_size_ ==
other.parent_percentage_resolution_inline_size_ &&
initial_containing_block_size_ ==
other.initial_containing_block_size_ &&
fragmentainer_block_size_ == other.fragmentainer_block_size_ &&
fragmentainer_space_at_bfc_start_ ==
other.fragmentainer_space_at_bfc_start_ &&
is_fixed_size_inline_ == other.is_fixed_size_inline_ &&
is_fixed_size_block_ == other.is_fixed_size_block_ &&
is_shrink_to_fit_ == other.is_shrink_to_fit_ &&
is_intermediate_layout_ == other.is_intermediate_layout_ &&
block_direction_fragmentation_type_ ==
other.block_direction_fragmentation_type_ &&
is_new_fc_ == other.is_new_fc_ &&
separate_leading_fragmentainer_margins_ ==
other.separate_leading_fragmentainer_margins_ &&
is_anonymous_ == other.is_anonymous_ &&
should_force_clearance_ == other.should_force_clearance_ &&
adjoining_floats_ == other.adjoining_floats_ &&
writing_mode_ == other.writing_mode_ &&
direction_ == other.direction_ &&
margin_strut_ == other.margin_strut_ &&
bfc_offset_ == other.bfc_offset_ &&
floats_bfc_offset_ == other.floats_bfc_offset_ &&
clearance_offset_ == other.clearance_offset_ &&
baseline_requests_ == other.baseline_requests_;
}
bool NGConstraintSpace::operator!=(const NGConstraintSpace& other) const {
return !(*this == other);
}
String NGConstraintSpace::ToString() const {
return String::Format("Offset: %s,%s Size: %sx%s Clearance: %s",
bfc_offset_.line_offset.ToString().Ascii().data(),
bfc_offset_.block_offset.ToString().Ascii().data(),
AvailableSize().inline_size.ToString().Ascii().data(),
AvailableSize().block_size.ToString().Ascii().data(),
HasClearanceOffset()
? ClearanceOffset().ToString().Ascii().data()
: "none");
}
} // namespace blink
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