| // Copyright 2017 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 NGExclusionSpace_h |
| #define NGExclusionSpace_h |
| |
| #include "core/CoreExport.h" |
| #include "core/layout/ng/ng_exclusion.h" |
| #include "core/style/ComputedStyleConstants.h" |
| #include "platform/LayoutUnit.h" |
| #include "platform/wtf/Optional.h" |
| #include "platform/wtf/Vector.h" |
| |
| namespace blink { |
| |
| typedef NGLogicalRect NGLayoutOpportunity; |
| |
| // The exclusion space represents all of the exclusions within a block |
| // formatting context. |
| // |
| // The space is mutated simply by adding exclusions, and various information |
| // can be queried based on the exclusions. |
| class CORE_EXPORT NGExclusionSpace { |
| public: |
| NGExclusionSpace(); |
| |
| void Add(const NGExclusion& exclusion); |
| |
| // Returns a layout opportunity, within the BFC, starting at the given offset, |
| // with a size greater than {@code minimum_size}. |
| NGLayoutOpportunity FindLayoutOpportunity(const NGLogicalOffset& offset, |
| const NGLogicalSize& available_size, |
| const NGLogicalSize& minimum_size); |
| |
| // Returns the clearance offset based on the provided {@code clear_type}. |
| LayoutUnit ClearanceOffset(EClear clear_type); |
| |
| // Returns the block start offset of the last float added. |
| LayoutUnit LastFloatBlockStart() const { return last_float_block_start_; } |
| |
| bool HasLeftFloat() const { return has_left_float_; } |
| bool HasRightFloat() const { return has_right_float_; } |
| |
| bool operator==(const NGExclusionSpace& other) const; |
| bool operator!=(const NGExclusionSpace& other) const { |
| return !(*this == other); |
| } |
| |
| private: |
| friend class NGLayoutOpportunityIterator; |
| Vector<NGExclusion> storage_; |
| |
| // This member is used for implementing the "top edge alignment rule" for |
| // floats. Floats can be positioned at negative offsets, hence is initialized |
| // the minimum value. |
| LayoutUnit last_float_block_start_; |
| |
| // These members are used for keeping track of the "lowest" offset for each |
| // type of float. This is used for implementing float clearance. |
| LayoutUnit left_float_clear_offset_; |
| LayoutUnit right_float_clear_offset_; |
| |
| unsigned has_left_float_ : 1; |
| unsigned has_right_float_ : 1; |
| }; |
| |
| } // namespace blink |
| |
| #endif // NGExclusionSpace_h |