[LayoutNG] Change core/layout/ng to Chromium style and rename files.

third_party/WebKit/Source/core/layout/ng/NGConstraintSpace.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 "platform/LayoutUnit.h"
-#include "wtf/DoublyLinkedList.h"
-
-namespace blink {
-
-class NGConstraintSpace;
-class NGDerivedConstraintSpace;
-class NGExclusion;
-class NGFragment;
-class NGLayoutOpportunityIterator;
-class LayoutBox;
-
-enum NGExclusionType {
-    NGClearNone = 0,
-    NGClearFloatLeft = 1,
-    NGClearFloatRight = 2,
-    NGClearFragment = 4
-};
-
-enum NGFragmentationType {
-    FragmentNone,
-    FragmentPage,
-    FragmentColumn,
-    FragmentRegion
-};
-
-enum NGExclusionFlowType {
-    ExcludeNone,
-    ExcludeInlineFlow,
-    ExcludeInlineStart,
-    ExcludeInlineEnd,
-    ExcludeInlineBoth
-};
-
-class NGExclusion {
-public:
-    NGExclusion();
-    ~NGExclusion() { }
-};
-
-class CORE_EXPORT NGConstraintSpace {
-public:
-    NGConstraintSpace(LayoutUnit inlineContainerSize,
-        LayoutUnit blockContainerSize);
-    ~NGConstraintSpace() { }
-
-    // Constructs Layout NG constraint space from legacy layout object.
-    static NGConstraintSpace fromLayoutObject(const LayoutBox&);
-
-    void addExclusion(const NGExclusion, unsigned options = 0);
-    void setOverflowTriggersScrollbar(bool inlineTriggers,
-        bool blockTriggers);
-    void setFixedSize(bool inlineFixed, bool blockFixed);
-    void setFragmentationType(NGFragmentationType);
-
-    // Size of the container in each direction. Used for the following
-    // three cases:
-    // 1) Percentage resolution.
-    // 2) Resolving absolute positions of children.
-    // 3) Defining the threashold that triggers the presence of a
-    //    scrollbar. Only applies if the corresponding scrollbarTrigger
-    //    flag has been set for the direction.
-    LayoutUnit inlineContainerSize() const
-    {
-        return m_inlineContainerSize;
-    }
-    LayoutUnit blockContainerSize() const
-    {
-        return m_blockContainerSize;
-    }
-
-    // Whether exceeding the containerSize triggers the presence of a
-    // scrollbar for the indicated direction.
-    // If exceeded the current layout should be aborted and invoked again
-    // with a constraint space modified to reserve space for a scrollbar.
-    bool inlineTriggersScrollbar() const
-    {
-        return m_inlineTriggersScrollbar;
-    }
-    bool blockTriggersScrollbar() const
-    {
-        return m_blockTriggersScrollbar;
-    }
-
-    // Some layout modes “stretch” their children to a fixed size (e.g. flex,
-    // grid). These flags represented whether a layout needs to produce a
-    // fragment that satisfies a fixed constraint in the inline and block
-    // direction respectively.
-    bool fixedInlineSize() const { return m_fixedInlineSize; }
-    bool fixedBlockSize() const { return m_fixedBlockSize; }
-
-    // If specified a layout should produce a Fragment which fragments at the
-    // blockSize if possible.
-    NGFragmentationType blockFragmentationType() const
-    {
-        return static_cast<NGFragmentationType>(m_blockFragmentationType);
-    }
-
-    DoublyLinkedList<const NGExclusion> exclusions(unsigned options = 0) const;
-
-    NGLayoutOpportunityIterator layoutOpportunities(
-        unsigned clear = NGClearNone,
-        NGExclusionFlowType avoid = ExcludeNone) const;
-
-    // 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 NGFragment);
-
-private:
-    LayoutUnit m_inlineContainerSize;
-    LayoutUnit m_blockContainerSize;
-
-    unsigned m_fixedInlineSize : 1;
-    unsigned m_fixedBlockSize : 1;
-    unsigned m_inlineTriggersScrollbar : 1;
-    unsigned m_blockTriggersScrollbar : 1;
-    unsigned m_blockFragmentationType : 2;
-
-    DoublyLinkedList<const NGExclusion> m_exclusions;
-};
-
-
-class CORE_EXPORT NGLayoutOpportunityIterator final {
-public:
-    NGLayoutOpportunityIterator(const NGConstraintSpace* space,
-        unsigned clear, NGExclusionFlowType avoid)
-        : m_constraintSpace(space)
-        , m_clear(clear)
-        , m_avoid(avoid) { }
-    ~NGLayoutOpportunityIterator() { }
-
-    const NGDerivedConstraintSpace* next();
-
-private:
-    const NGConstraintSpace* m_constraintSpace;
-    unsigned m_clear;
-    NGExclusionFlowType m_avoid;
-};
-
-
-class CORE_EXPORT NGDerivedConstraintSpace final : NGConstraintSpace {
-public:
-    ~NGDerivedConstraintSpace();
-
-    LayoutUnit inlineOffset() const;
-    LayoutUnit blockOffset() const;
-    LayoutUnit inlineSize() const;
-    LayoutUnit blockSize() const;
-
-private:
-    NGDerivedConstraintSpace();
-
-    LayoutUnit m_inlineOffset;
-    LayoutUnit m_blockOffset;
-    LayoutUnit m_inlineSize;
-    LayoutUnit m_blockSize;
-    NGConstraintSpace* m_original;
-};
-
-} // namespace blink
-
-#endif // NGConstraintSpace_h