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// Copyright 2017 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_space_utils.h"
#include "third_party/blink/renderer/core/layout/ng/geometry/ng_bfc_offset.h"
#include "third_party/blink/renderer/core/layout/ng/ng_constraint_space.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"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/text/writing_mode.h"
namespace blink {
bool AdjustToClearance(LayoutUnit clearance_offset, NGBfcOffset* offset) {
DCHECK(offset);
if (clearance_offset > offset->block_offset) {
offset->block_offset = clearance_offset;
return true;
}
return false;
}
NGConstraintSpace CreateIndefiniteConstraintSpaceForChild(
const ComputedStyle& container_style,
NGLayoutInputNode child) {
WritingMode parent_writing_mode = container_style.GetWritingMode();
WritingMode child_writing_mode = child.Style().GetWritingMode();
DCHECK(!IsParallelWritingMode(parent_writing_mode, child_writing_mode));
LogicalSize indefinite_size(kIndefiniteSize, kIndefiniteSize);
NGConstraintSpaceBuilder builder(parent_writing_mode, child_writing_mode,
child.CreatesNewFormattingContext());
SetOrthogonalFallbackInlineSizeIfNeeded(container_style, child, &builder);
builder.SetAvailableSize(indefinite_size);
builder.SetPercentageResolutionSize(indefinite_size);
builder.SetReplacedPercentageResolutionSize(indefinite_size);
return builder.ToConstraintSpace();
}
void SetOrthogonalFallbackInlineSizeIfNeeded(
const ComputedStyle& parent_style,
const NGLayoutInputNode child,
NGConstraintSpaceBuilder* builder) {
if (IsParallelWritingMode(parent_style.GetWritingMode(),
child.Style().GetWritingMode()))
return;
PhysicalSize orthogonal_children_containing_block_size =
child.InitialContainingBlockSize();
LayoutUnit fallback_size;
if (IsHorizontalWritingMode(parent_style.GetWritingMode()))
fallback_size = orthogonal_children_containing_block_size.height;
else
fallback_size = orthogonal_children_containing_block_size.width;
LayoutUnit size(LayoutUnit::Max());
if (parent_style.LogicalHeight().IsFixed()) {
// Note that during layout, fixed size will already be taken care of (and
// set in the constraint space), but when calculating intrinsic sizes of
// orthogonal children, that won't be the case.
size = LayoutUnit(parent_style.LogicalHeight().GetFloatValue());
}
if (parent_style.LogicalMaxHeight().IsFixed()) {
size = std::min(
size, LayoutUnit(parent_style.LogicalMaxHeight().GetFloatValue()));
}
if (parent_style.LogicalMinHeight().IsFixed()) {
size = std::max(
size, LayoutUnit(parent_style.LogicalMinHeight().GetFloatValue()));
}
// Calculate the content-box size.
if (parent_style.BoxSizing() == EBoxSizing::kBorderBox) {
// We're unable to resolve percentages at this point, so make sure we're
// only dealing with fixed-size values.
if (!parent_style.PaddingBefore().IsFixed() ||
!parent_style.PaddingAfter().IsFixed()) {
builder->SetOrthogonalFallbackInlineSize(fallback_size);
return;
}
LayoutUnit border_padding(parent_style.BorderBefore().Width() +
parent_style.BorderAfter().Width() +
parent_style.PaddingBefore().GetFloatValue() +
parent_style.PaddingAfter().GetFloatValue());
size -= border_padding;
size = size.ClampNegativeToZero();
}
fallback_size = std::min(fallback_size, size);
builder->SetOrthogonalFallbackInlineSize(fallback_size);
}
} // namespace blink
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