[LayoutNG] Implement ComputeMinAndMaxContentSizes for inline

third_party/WebKit/Source/core/layout/ng/ng_inline_node.h

 // 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 "core/CoreExport.h"
 #include "core/layout/ng/ng_layout_input_node.h"
 #include "platform/fonts/FontFallbackPriority.h"
 #include "platform/fonts/shaping/ShapeResult.h"
 #include "platform/heap/Handle.h"
 #include "platform/text/TextDirection.h"
 #include "wtf/text/WTFString.h"
 
 #include <unicode/ubidi.h>
 #include <unicode/uscript.h>
 
 namespace blink {
 
 class ComputedStyle;
 class LayoutBlockFlow;
 class LayoutObject;
 class LayoutUnit;
+struct MinAndMaxContentSizes;
 class NGConstraintSpace;
 class NGLayoutInlineItem;
 class NGLayoutInlineItemRange;
 class NGLayoutInlineItemsBuilder;
 class NGLayoutResult;
 class NGLineBuilder;
 
-// Represents an inline node to be laid out.
+// 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(LayoutObject* start_inline, const ComputedStyle* block_style);
   ~NGInlineNode() override;
 
   const ComputedStyle* BlockStyle() const { return block_style_.get(); }
 
   RefPtr<NGLayoutResult> Layout(NGConstraintSpace*) override;
   void LayoutInline(NGConstraintSpace*, NGLineBuilder*);
   NGInlineNode* NextSibling() override;
   LayoutObject* GetLayoutObject() override;
 
-  // Prepare inline and text content for layout. Must be called before
-  // calling the Layout method.
-  void PrepareLayout();
+  // 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.
+  MinAndMaxContentSizes ComputeMinAndMaxContentSizes();
+
+  // Instruct to re-compute |PrepareLayout| on the next layout.
+  void InvalidatePrepareLayout();
 
   const String& Text() const { return text_content_; }
   String Text(unsigned start_offset, unsigned end_offset) const {
     return text_content_.substring(start_offset, end_offset);
   }
 
   Vector<NGLayoutInlineItem>& Items() { return items_; }
   NGLayoutInlineItemRange Items(unsigned start_index, unsigned end_index);
 
   LayoutBlockFlow* GetLayoutBlockFlow() const;
   void GetLayoutTextOffsets(Vector<unsigned, 32>*);
 
   bool IsBidiEnabled() const { return is_bidi_enabled_; }
 
   void AssertOffset(unsigned index, unsigned offset) const;
   void AssertEndOffset(unsigned index, unsigned offset) const;
 
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   NGInlineNode();  // This constructor is only for testing.
+
+  // Prepare inline and text content for layout. Must be called before
+  // calling the Layout method.
+  void PrepareLayout();
+  bool IsPrepareLayoutFinished() const { return !items_.isEmpty(); }
+
   void CollectInlines(LayoutObject* start, LayoutObject* last);
   void CollectInlines(LayoutObject* start,
                       LayoutObject* last,
                       NGLayoutInlineItemsBuilder*);
   void SegmentText();
   void ShapeText();
 
   LayoutObject* start_inline_;
   LayoutObject* last_inline_;
   RefPtr<const ComputedStyle> block_style_;
@@ skipping 133 matching lines @@
 
  private:
   NGLayoutInlineItem* start_item_;
   unsigned size_;
   unsigned start_index_;
 };
 
 }  // namespace blink
 
 #endif  // NGInlineNode_h