Introduce NGFloatingObject

third_party/WebKit/Source/core/layout/ng/ng_fragment_builder.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 NGFragmentBuilder_h
 #define NGFragmentBuilder_h
 
+#include "core/layout/ng/ng_constraint_space.h"
+#include "core/layout/ng/ng_floating_object.h"
 #include "core/layout/ng/ng_physical_fragment.h"
 #include "core/layout/ng/ng_units.h"
 
 namespace blink {
 
 class NGFragment;
 class NGInlineNode;
 class NGPhysicalBoxFragment;
 class NGPhysicalTextFragment;
 
 class CORE_EXPORT NGFragmentBuilder final
     : public GarbageCollectedFinalized<NGFragmentBuilder> {
  public:
   NGFragmentBuilder(NGPhysicalFragment::NGFragmentType);
 
   using WeakBoxList = HeapLinkedHashSet<WeakMember<NGBlockNode>>;
 
   NGFragmentBuilder& SetWritingMode(NGWritingMode);
   NGFragmentBuilder& SetDirection(TextDirection);
 
   NGFragmentBuilder& SetInlineSize(LayoutUnit);
   NGFragmentBuilder& SetBlockSize(LayoutUnit);
   NGLogicalSize Size() const { return size_; }
 
   NGFragmentBuilder& SetInlineOverflow(LayoutUnit);
   NGFragmentBuilder& SetBlockOverflow(LayoutUnit);
 
   NGFragmentBuilder& AddChild(NGFragment*, const NGLogicalOffset&);
+  NGFragmentBuilder& AddFloatingObject(NGFloatingObject*,
+                                       const NGLogicalOffset&);
 
   // Builder has non-trivial out-of-flow descendant methods.
   // These methods are building blocks for implementation of
   // out-of-flow descendants by layout algorithms.
   //
   // They are intended to be used by layout algorithm like this:
   //
   // Part 1: layout algorithm positions in-flow children.
   //   out-of-flow children, and out-of-flow descendants of fragments
   //   are stored inside builder.
@@ skipping 27 matching lines @@
   //   }
   // }
   NGFragmentBuilder& AddOutOfFlowChildCandidate(NGBlockNode*, NGLogicalOffset);
 
   void GetAndClearOutOfFlowDescendantCandidates(WeakBoxList*,
                                                 Vector<NGStaticPosition>*);
 
   NGFragmentBuilder& AddOutOfFlowDescendant(NGBlockNode*,
                                             const NGStaticPosition&);
 
+  NGFragmentBuilder& AddUnpositionedFloat(NGFloatingObject* floating_object);
+
   void SetBreakToken(NGBreakToken* token) {
     DCHECK(!break_token_);
     break_token_ = token;
   }
   bool HasBreakToken() const { return break_token_; }
 
   // Sets MarginStrut for the resultant fragment.
   NGFragmentBuilder& SetMarginStrutBlockStart(const NGMarginStrut& from);
   NGFragmentBuilder& SetMarginStrutBlockEnd(const NGMarginStrut& from);
 
   // Offsets are not supposed to be set during fragment construction, so we
   // do not provide a setter here.
 
   // Creates the fragment. Can only be called once.
   NGPhysicalBoxFragment* ToBoxFragment();
   NGPhysicalTextFragment* ToTextFragment(NGInlineNode*,
                                          unsigned start_index,
                                          unsigned end_index);
 
+  // List of floats that need to be positioned.
+  HeapVector<Member<NGFloatingObject>>& UnpositionedFloats() {
+    return unpositioned_floats_;
+  }
+
   DECLARE_VIRTUAL_TRACE();
 
  private:
   // Out-of-flow descendant placement information.
   // The generated fragment must compute NGStaticPosition for all
   // out-of-flow descendants.
   // The resulting NGStaticPosition gets derived from:
   // 1. The offset of fragment's child.
   // 2. The static position of descendant wrt child.
   //
@@ skipping 19 matching lines @@
 
   HeapVector<Member<NGPhysicalFragment>> children_;
   Vector<NGLogicalOffset> offsets_;
 
   WeakBoxList out_of_flow_descendant_candidates_;
   Vector<OutOfFlowPlacement> out_of_flow_candidate_placements_;
 
   WeakBoxList out_of_flow_descendants_;
   Vector<NGStaticPosition> out_of_flow_positions_;
 
+  // Floats that need to be positioned by the next in-flow fragment that can
+  // determine its block position in space.
+  HeapVector<Member<NGFloatingObject>> unpositioned_floats_;
+
+  Vector<NGLogicalOffset> floating_object_offsets_;
+  HeapVector<Member<NGFloatingObject>> positioned_floats_;
+
   Member<NGBreakToken> break_token_;
 };
 
 }  // namespace blink
 
 #endif  // NGFragmentBuilder