| // 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 NGPhysicalFragment_h |
| #define NGPhysicalFragment_h |
| |
| #include "core/CoreExport.h" |
| #include "core/layout/ng/ng_units.h" |
| #include "platform/LayoutUnit.h" |
| #include "platform/heap/Handle.h" |
| #include "wtf/Vector.h" |
| |
| namespace blink { |
| |
| class ComputedStyle; |
| class LayoutObject; |
| class NGBreakToken; |
| |
| // The NGPhysicalFragment contains the output geometry from layout. The |
| // fragment stores all of its information in the physical coordinate system for |
| // use by paint, hit-testing etc. |
| // |
| // The fragment keeps a pointer back to the LayoutObject which generated it. |
| // Once we have transitioned fully to LayoutNG it should be a const pointer |
| // such that paint/hit-testing/etc don't modify it. |
| // |
| // Layout code should only access geometry information through the |
| // NGFragment wrapper classes which transforms information into the logical |
| // coordinate system. |
| class CORE_EXPORT NGPhysicalFragment : public RefCounted<NGPhysicalFragment> { |
| public: |
| enum NGFragmentType { kFragmentBox = 0, kFragmentText = 1 }; |
| |
| NGFragmentType Type() const { return static_cast<NGFragmentType>(type_); } |
| |
| // Override RefCounted's deref() to ensure operator delete is called on the |
| // appropriate subclass type. |
| void deref() const { |
| if (derefBase()) |
| destroy(); |
| } |
| |
| // The accessors in this class shouldn't be used by layout code directly, |
| // instead should be accessed by the NGFragmentBase classes. These accessors |
| // exist for paint, hit-testing, etc. |
| |
| // Returns the border-box size. |
| NGPhysicalSize Size() const { return size_; } |
| LayoutUnit Width() const { return size_.width; } |
| LayoutUnit Height() const { return size_.height; } |
| |
| // Returns the total size, including the contents outside of the border-box. |
| LayoutUnit WidthOverflow() const { return overflow_.width; } |
| LayoutUnit HeightOverflow() const { return overflow_.height; } |
| |
| // Returns the offset relative to the parent fragement's content-box. |
| LayoutUnit LeftOffset() const { |
| DCHECK(is_placed_); |
| return offset_.left; |
| } |
| |
| LayoutUnit TopOffset() const { |
| DCHECK(is_placed_); |
| return offset_.top; |
| } |
| |
| NGPhysicalOffset Offset() const { |
| DCHECK(is_placed_); |
| return offset_; |
| } |
| |
| // Should only be used by the parent fragement's layout. |
| void SetOffset(NGPhysicalOffset offset) { |
| DCHECK(!is_placed_); |
| offset_ = offset; |
| is_placed_ = true; |
| } |
| |
| NGBreakToken* BreakToken() const { return break_token_; } |
| |
| const ComputedStyle& Style() const; |
| |
| // GetLayoutObject should only be used when necessary for compatibility |
| // with LegacyLayout. |
| LayoutObject* GetLayoutObject() const { return layout_object_; } |
| |
| bool IsPlaced() const { return is_placed_; } |
| |
| protected: |
| NGPhysicalFragment(LayoutObject* layout_object, |
| NGPhysicalSize size, |
| NGPhysicalSize overflow, |
| NGFragmentType type, |
| NGBreakToken* break_token = nullptr); |
| |
| LayoutObject* layout_object_; |
| NGPhysicalSize size_; |
| NGPhysicalSize overflow_; |
| NGPhysicalOffset offset_; |
| Persistent<NGBreakToken> break_token_; |
| |
| unsigned type_ : 1; |
| unsigned is_placed_ : 1; |
| |
| private: |
| void destroy() const; |
| }; |
| |
| } // namespace blink |
| |
| #endif // NGPhysicalFragment_h |