Add LayoutOpportunityIterator method to NGConstraintSpace

third_party/WebKit/Source/core/layout/ng/ng_constraint_space.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 NGConstraintSpace_h
 #define NGConstraintSpace_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/geometry/ng_logical_offset.h"
 #include "core/layout/ng/geometry/ng_logical_size.h"
 #include "core/layout/ng/geometry/ng_margin_strut.h"
 #include "core/layout/ng/geometry/ng_physical_size.h"
 #include "core/layout/ng/ng_exclusion.h"
+#include "core/layout/ng/ng_layout_opportunity_iterator.h"
 #include "core/layout/ng/ng_writing_mode.h"
 #include "platform/heap/Handle.h"
 #include "platform/text/TextDirection.h"
 #include "wtf/Optional.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class LayoutBox;
-class NGBoxFragment;
 
 enum NGFragmentationType {
   kFragmentNone,
   kFragmentPage,
   kFragmentColumn,
   kFragmentRegion
 };
 
 // The NGConstraintSpace represents a set of constraints and available space
 // which a layout algorithm may produce a NGFragment within.
@@ skipping 66 matching lines @@
   bool IsFixedSizeBlock() const { return is_fixed_size_block_; }
 
   // Whether an auto inline-size should be interpreted as shrink-to-fit
   // (ie. fit-content). This is used for inline-block, floats, etc.
   bool IsShrinkToFit() const { return is_shrink_to_fit_; }
 
   // If specified a layout should produce a Fragment which fragments at the
   // blockSize if possible.
   NGFragmentationType BlockFragmentationType() const;
 
+  NGLayoutOpportunityIterator* LayoutOpportunityIterator();
+
   // Return true if this contraint space participates in a fragmentation
   // context.
   bool HasBlockFragmentation() const {
     return BlockFragmentationType() != kFragmentNone;
   }
 
-  // Modifies constraint space to account for a placed fragment. Depending on
-  // the shape of the fragment this will either modify the inline or block
-  // size, or add an exclusion.
-  void Subtract(const NGBoxFragment*);
-
   NGMarginStrut MarginStrut() const { return margin_strut_; }
 
   NGLogicalOffset BfcOffset() const { return bfc_offset_; }
 
   WTF::Optional<LayoutUnit> ClearanceOffset() const {
     return clearance_offset_;
   }
 
   String ToString() const;
 
@@ skipping 45 matching lines @@
 
   unsigned is_anonymous_ : 1;
 
   unsigned writing_mode_ : 3;
   unsigned direction_ : 1;
 
   NGMarginStrut margin_strut_;
   NGLogicalOffset bfc_offset_;
   const std::shared_ptr<NGExclusions> exclusions_;
   WTF::Optional<LayoutUnit> clearance_offset_;
+  std::unique_ptr<NGLayoutOpportunityIterator> layout_opp_iter_;
 };
 
 inline std::ostream& operator<<(std::ostream& stream,
                                 const NGConstraintSpace& value) {
   return stream << value.ToString();
 }
 
 }  // namespace blink
 
 #endif  // NGConstraintSpace_h