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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.
#ifndef NGInlineNode_h
#define NGInlineNode_h
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/layout_block_flow.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_node_data.h"
#include "third_party/blink/renderer/core/layout/ng/ng_layout_input_node.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
class NGBlockBreakToken;
class NGConstraintSpace;
class NGInlineChildLayoutContext;
class NGLayoutResult;
class NGOffsetMapping;
class NGInlineNodeLegacy;
struct MinMaxSize;
struct NGInlineItemsData;
// Represents an anonymous block box to be laid out, that contains consecutive
// inline nodes and their descendants.
class CORE_EXPORT NGInlineNode : public NGLayoutInputNode {
public:
NGInlineNode(LayoutBlockFlow*);
LayoutBlockFlow* GetLayoutBlockFlow() const {
return ToLayoutBlockFlow(box_);
}
NGLayoutInputNode NextSibling() { return nullptr; }
// True in quirks mode or limited-quirks mode, which require line-height
// quirks.
// https://quirks.spec.whatwg.org/#the-line-height-calculation-quirk
bool InLineHeightQuirksMode() const {
return GetDocument().InLineHeightQuirksMode();
}
scoped_refptr<NGLayoutResult> Layout(const NGConstraintSpace&,
const NGBreakToken*,
NGInlineChildLayoutContext* context);
// Prepare to reuse fragments. Returns false if reuse is not possible.
bool PrepareReuseFragments(const NGConstraintSpace&);
// Computes the value of min-content and max-content for this anonymous block
// box. min-content is the inline size when lines wrap at every break
// opportunity, and max-content is when lines do not wrap at all.
MinMaxSize ComputeMinMaxSize(WritingMode container_writing_mode,
const MinMaxSizeInput&,
const NGConstraintSpace* = nullptr);
// Instruct to re-compute |PrepareLayout| on the next layout.
void InvalidatePrepareLayoutForTest() {
GetLayoutBlockFlow()->ResetNGInlineNodeData();
DCHECK(!IsPrepareLayoutFinished());
}
const NGInlineItemsData& ItemsData(bool is_first_line) const {
return Data().ItemsData(is_first_line);
}
// Clear associated fragments for LayoutObjects.
// They are associated when NGPaintFragment is constructed, but when clearing,
// NGInlineItem provides easier and faster logic.
static void ClearAssociatedFragments(const NGPhysicalFragment& fragment,
const NGBlockBreakToken* break_token);
// Returns the DOM to text content offset mapping of this block. If it is not
// computed before, compute and store it in NGInlineNodeData.
// This funciton must be called with clean layout.
const NGOffsetMapping* ComputeOffsetMappingIfNeeded();
// Get |NGOffsetMapping| for the |layout_block_flow|. If |layout_block_flow|
// is LayoutNG and it is already laid out, this function is the same as
// |ComputeOffsetMappingIfNeeded|. |storage| is not used in this case, and can
// be null.
//
// Otherwise, this function computes |NGOffsetMapping| and store in |storage|
// as well as returning the pointer. The caller is responsible for keeping
// |storage| for the life cycle of the returned |NGOffsetMapping|.
static const NGOffsetMapping* GetOffsetMapping(
LayoutBlockFlow* layout_block_flow,
std::unique_ptr<NGOffsetMapping>* storage);
bool IsBidiEnabled() const { return Data().is_bidi_enabled_; }
TextDirection BaseDirection() const { return Data().BaseDirection(); }
bool IsEmptyInline() { return EnsureData().is_empty_inline_; }
// @return if this node can contain the "first formatted line".
// https://www.w3.org/TR/CSS22/selector.html#first-formatted-line
bool CanContainFirstFormattedLine() const {
DCHECK(GetLayoutBlockFlow());
return GetLayoutBlockFlow()->CanContainFirstFormattedLine();
}
bool UseFirstLineStyle() const;
void CheckConsistency() const;
String ToString() const;
protected:
bool IsPrepareLayoutFinished() const;
// Prepare inline and text content for layout. Must be called before
// calling the Layout method.
void PrepareLayoutIfNeeded();
void CollectInlines(NGInlineNodeData*,
NGInlineNodeData* previous_data = nullptr);
void SegmentText(NGInlineNodeData*);
void SegmentScriptRuns(NGInlineNodeData*);
void SegmentFontOrientation(NGInlineNodeData*);
void SegmentBidiRuns(NGInlineNodeData*);
void ShapeText(NGInlineItemsData*,
NGInlineItemsData* previous_data = nullptr);
void ShapeTextForFirstLineIfNeeded(NGInlineNodeData*);
void AssociateItemsWithInlines(NGInlineNodeData*);
bool MarkLineBoxesDirty(LayoutBlockFlow*);
NGInlineNodeData* MutableData() {
return ToLayoutBlockFlow(box_)->GetNGInlineNodeData();
}
const NGInlineNodeData& Data() const {
DCHECK(IsPrepareLayoutFinished() &&
!GetLayoutBlockFlow()->NeedsCollectInlines());
return *ToLayoutBlockFlow(box_)->GetNGInlineNodeData();
}
// Same as |Data()| but can access even when |NeedsCollectInlines()| is set.
const NGInlineNodeData& MaybeDirtyData() const {
DCHECK(IsPrepareLayoutFinished());
return *ToLayoutBlockFlow(box_)->GetNGInlineNodeData();
}
const NGInlineNodeData& EnsureData();
static void ComputeOffsetMapping(LayoutBlockFlow* layout_block_flow,
NGInlineNodeData* data);
// This function shares bidi segmentation code between inline layout algorithm
// and |NGCaretNavigator| building, which may run on legacy layout.
// TODO(layout-dev): Merge with |SegmentBidiRuns| when we remove legacy layout
static void SegmentBidiRunsInternal(NGInlineNodeData*, const ComputedStyle&);
friend class NGLineBreakerTest;
friend class NGInlineNodeLegacy;
};
DEFINE_TYPE_CASTS(NGInlineNode,
NGLayoutInputNode,
node,
node->IsInline(),
node.IsInline());
} // namespace blink
#endif // NGInlineNode_h
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