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// Copyright 2018 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_NG_FLEX_LAYOUT_ALGORITHM_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_NG_FLEX_LAYOUT_ALGORITHM_H_
#include "third_party/blink/renderer/core/layout/ng/ng_layout_algorithm.h"
#include "third_party/blink/renderer/core/layout/flexible_box_algorithm.h"
#include "third_party/blink/renderer/core/layout/ng/ng_box_fragment_builder.h"
namespace blink {
class NGBlockNode;
class NGBlockBreakToken;
class CORE_EXPORT NGFlexLayoutAlgorithm
: public NGLayoutAlgorithm<NGBlockNode,
NGBoxFragmentBuilder,
NGBlockBreakToken> {
public:
NGFlexLayoutAlgorithm(const NGLayoutAlgorithmParams& params);
scoped_refptr<const NGLayoutResult> Layout() override;
base::Optional<MinMaxSize> ComputeMinMaxSize(
const MinMaxSizeInput&) const override;
private:
bool DoesItemCrossSizeComputeToAuto(const NGBlockNode& child) const;
bool IsItemMainSizeDefinite(const NGBlockNode& child) const;
bool IsItemCrossAxisLengthDefinite(const NGBlockNode& child,
const Length& length) const;
bool ShouldItemShrinkToFit(const NGBlockNode& child) const;
bool DoesItemStretch(const NGBlockNode& child) const;
// This implements the first of the additional scenarios where a flex item
// has definite sizes when it would not if it weren't a flex item.
// https://drafts.csswg.org/css-flexbox/#definite-sizes
bool WillChildCrossSizeBeContainerCrossSize(const NGBlockNode& child) const;
LayoutUnit AdjustChildSizeForAspectRatioCrossAxisMinAndMax(
const NGBlockNode& child,
LayoutUnit content_suggestion,
LayoutUnit cross_min,
LayoutUnit cross_max);
bool IsColumnContainerMainSizeDefinite() const;
bool IsContainerCrossSizeDefinite() const;
NGConstraintSpace BuildConstraintSpaceForDeterminingFlexBasis(
const NGBlockNode& flex_item) const;
void ConstructAndAppendFlexItems();
void ApplyStretchAlignmentToChild(FlexItem& flex_item);
void GiveLinesAndItemsFinalPositionAndSize();
void LayoutColumnReverse(LayoutUnit main_axis_content_size);
// This is same method as FlexItem but we need that logic before FlexItem is
// constructed.
bool MainAxisIsInlineAxis(const NGBlockNode& child) const;
LayoutUnit MainAxisContentExtent(LayoutUnit sum_hypothetical_main_size);
void HandleOutOfFlowPositioned(NGBlockNode child);
// TODO(dgrogan): This is redundant with FlexLayoutAlgorithm.IsMultiline() but
// it's needed before the algorithm is instantiated. Figure out how to
// not reimplement.
bool IsMultiline() const;
const NGBoxStrut border_padding_;
const NGBoxStrut border_scrollbar_padding_;
const bool is_column_;
const bool is_horizontal_flow_;
// These are populated at the top of Layout(), so aren't available in
// ComputeMinMaxSize() or anything it calls.
LogicalSize border_box_size_;
LogicalSize content_box_size_;
LogicalSize child_percentage_size_;
base::Optional<FlexLayoutAlgorithm> algorithm_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_NG_NG_FLEX_LAYOUT_ALGORITHM_H_
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