| // 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 NGInlineLayoutAlgorithm_h |
| #define NGInlineLayoutAlgorithm_h |
| |
| #include "core/CoreExport.h" |
| #include "core/layout/ng/geometry/ng_logical_offset.h" |
| #include "core/layout/ng/inline/ng_inline_box_state.h" |
| #include "core/layout/ng/inline/ng_inline_break_token.h" |
| #include "core/layout/ng/inline/ng_inline_item_result.h" |
| #include "core/layout/ng/inline/ng_line_height_metrics.h" |
| #include "core/layout/ng/ng_constraint_space_builder.h" |
| #include "core/layout/ng/ng_fragment_builder.h" |
| #include "core/layout/ng/ng_layout_algorithm.h" |
| #include "platform/fonts/FontBaseline.h" |
| #include "platform/heap/Handle.h" |
| #include "platform/wtf/Vector.h" |
| |
| namespace blink { |
| |
| class NGConstraintSpace; |
| class NGInlineBreakToken; |
| class NGInlineNode; |
| class NGInlineItem; |
| class NGLineBoxFragmentBuilder; |
| class NGTextFragmentBuilder; |
| |
| // A class for inline layout (e.g. a <span> with no special style). |
| // |
| // This class determines the position of NGInlineItem and build line boxes. |
| // |
| // Uses NGLineBreaker to find NGInlineItems to form a line. |
| class CORE_EXPORT NGInlineLayoutAlgorithm final |
| : public NGLayoutAlgorithm<NGInlineNode, NGInlineBreakToken> { |
| public: |
| NGInlineLayoutAlgorithm(NGInlineNode, |
| NGConstraintSpace*, |
| NGInlineBreakToken* = nullptr); |
| |
| // The available width for the current line. |
| LayoutUnit AvailableWidth() const; |
| |
| // Create a line. |
| // @return false if the line does not fit in the constraint space in block |
| // direction. |
| bool CreateLine(NGInlineItemResults*, RefPtr<NGInlineBreakToken> = nullptr); |
| |
| RefPtr<NGLayoutResult> Layout() override; |
| |
| // Lays out the inline float. |
| // List of actions: |
| // - tries to position the float right away if we have enough space. |
| // - updates the current_opportunity if we actually place the float. |
| // - if it's too wide then we add the float to the unpositioned list so it can |
| // be positioned after we're done with the current line. |
| void LayoutAndPositionFloat(LayoutUnit end_position, LayoutObject*); |
| |
| private: |
| bool IsHorizontalWritingMode() const { return is_horizontal_writing_mode_; } |
| |
| bool IsFirstLine() const; |
| const ComputedStyle& FirstLineStyle() const; |
| const ComputedStyle& LineStyle() const; |
| |
| LayoutUnit LogicalLeftOffset() const; |
| |
| void BidiReorder(NGInlineItemResults*); |
| |
| bool PlaceItems(NGInlineItemResults*, RefPtr<NGInlineBreakToken>); |
| NGInlineBoxState* PlaceAtomicInline(const NGInlineItem&, |
| NGInlineItemResult*, |
| LayoutUnit position, |
| NGLineBoxFragmentBuilder*, |
| NGTextFragmentBuilder*); |
| |
| void ApplyTextAlign(LayoutUnit* line_left, |
| LayoutUnit inline_size, |
| LayoutUnit available_width); |
| |
| // Finds the next layout opportunity for the next text fragment. |
| void FindNextLayoutOpportunity(); |
| |
| NGInlineLayoutStateStack box_states_; |
| LayoutUnit content_size_; |
| LayoutUnit max_inline_size_; |
| FontBaseline baseline_type_ = FontBaseline::kAlphabeticBaseline; |
| |
| NGLogicalOffset bfc_offset_; |
| NGLogicalRect current_opportunity_; |
| |
| unsigned is_horizontal_writing_mode_ : 1; |
| unsigned disallow_first_line_rules_ : 1; |
| |
| NGConstraintSpaceBuilder space_builder_; |
| NGBoxStrut border_and_padding_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // NGInlineLayoutAlgorithm_h |