| /* |
| * Copyright 2015 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef COBALT_LAYOUT_BLOCK_FORMATTING_BLOCK_CONTAINER_BOX_H_ |
| #define COBALT_LAYOUT_BLOCK_FORMATTING_BLOCK_CONTAINER_BOX_H_ |
| |
| #include "cobalt/layout/base_direction.h" |
| #include "cobalt/layout/block_container_box.h" |
| #include "cobalt/layout/paragraph.h" |
| |
| namespace cobalt { |
| namespace layout { |
| |
| // A block container box that establishes a block formatting context. |
| // Implementation-specific, not defined in CSS 2.1. |
| class BlockFormattingBlockContainerBox : public BlockContainerBox { |
| public: |
| BlockFormattingBlockContainerBox( |
| const scoped_refptr<cssom::CSSComputedStyleDeclaration>& |
| css_computed_style_declaration, |
| BaseDirection base_direction, UsedStyleProvider* used_style_provider, |
| LayoutStatTracker* layout_stat_tracker); |
| |
| // From |ContainerBox|. |
| bool TryAddChild(const scoped_refptr<Box>& child_box) OVERRIDE; |
| |
| // Rest of the public methods. |
| |
| // A convenience method to add children. It is guaranteed that a block |
| // container box is able to become a parent of both block-level and |
| // inline-level boxes. |
| void AddChild(const scoped_refptr<Box>& child_box); |
| |
| protected: |
| // From |BlockContainerBox|. |
| scoped_ptr<FormattingContext> UpdateRectOfInFlowChildBoxes( |
| const LayoutParams& child_layout_params) OVERRIDE; |
| |
| private: |
| AnonymousBlockBox* GetLastChildAsAnonymousBlockBox(); |
| AnonymousBlockBox* GetOrAddAnonymousBlockBox(); |
| }; |
| |
| // Often abbreviated as simply "blocks", block-level block container boxes |
| // participate in the block formatting context and are the most common form |
| // of block container boxes. |
| // https://www.w3.org/TR/CSS21/visuren.html#block-boxes |
| // |
| // Although this class always establishes a block formatting context, it can |
| // nevertheless accommodate inline-level children through the creation |
| // of anonymous block boxes. When all children are inline-level this becomes |
| // slightly suboptimal from a memory standpoint but it simplifies |
| // the implementation and is conformance-neutral. |
| // https://www.w3.org/TR/CSS21/visuren.html#anonymous-block-level |
| class BlockLevelBlockContainerBox : public BlockFormattingBlockContainerBox { |
| public: |
| BlockLevelBlockContainerBox( |
| const scoped_refptr<cssom::CSSComputedStyleDeclaration>& |
| css_computed_style_declaration, |
| BaseDirection base_direction, UsedStyleProvider* used_style_provider, |
| LayoutStatTracker* layout_stat_tracker); |
| ~BlockLevelBlockContainerBox() OVERRIDE; |
| |
| // From |Box|. |
| Level GetLevel() const OVERRIDE; |
| |
| protected: |
| // From |Box|. |
| #ifdef COBALT_BOX_DUMP_ENABLED |
| void DumpClassName(std::ostream* stream) const OVERRIDE; |
| #endif // COBALT_BOX_DUMP_ENABLED |
| }; |
| |
| // Non-replaced inline-block elements generate block container boxes that |
| // participate in the inline formatting context as a single opaque box. They |
| // belong to a wider group called atomic inline-level boxes. |
| // https://www.w3.org/TR/CSS21/visuren.html#inline-boxes |
| // |
| // Although this class always establishes a block formatting context, it can |
| // nevertheless accommodate inline-level children through the creation |
| // of anonymous block boxes. When all children are inline-level this becomes |
| // slightly suboptimal from a memory standpoint but it simplifies |
| // the implementation and is conformance-neutral. |
| // https://www.w3.org/TR/CSS21/visuren.html#anonymous-block-level |
| class InlineLevelBlockContainerBox : public BlockFormattingBlockContainerBox { |
| public: |
| InlineLevelBlockContainerBox( |
| const scoped_refptr<cssom::CSSComputedStyleDeclaration>& |
| css_computed_style_declaration, |
| BaseDirection base_direction, const scoped_refptr<Paragraph>& paragraph, |
| int32 text_position, UsedStyleProvider* used_style_provider, |
| LayoutStatTracker* layout_stat_tracker); |
| ~InlineLevelBlockContainerBox() OVERRIDE; |
| |
| // From |Box|. |
| Level GetLevel() const OVERRIDE; |
| |
| WrapResult TryWrapAt(WrapAtPolicy wrap_at_policy, |
| WrapOpportunityPolicy wrap_opportunity_policy, |
| bool is_line_existence_justified, |
| LayoutUnit available_width, |
| bool should_collapse_trailing_white_space) OVERRIDE; |
| |
| base::optional<int> GetBidiLevel() const OVERRIDE; |
| |
| bool DoesFulfillEllipsisPlacementRequirement() const OVERRIDE; |
| void ResetEllipses() OVERRIDE; |
| bool IsHiddenByEllipsis() const OVERRIDE; |
| |
| protected: |
| // From |Box|. |
| #ifdef COBALT_BOX_DUMP_ENABLED |
| void DumpClassName(std::ostream* stream) const OVERRIDE; |
| void DumpProperties(std::ostream* stream) const OVERRIDE; |
| #endif // COBALT_BOX_DUMP_ENABLED |
| |
| private: |
| // From |Box|. |
| void DoPlaceEllipsisOrProcessPlacedEllipsis( |
| BaseDirection base_direction, LayoutUnit desired_offset, |
| bool* is_placement_requirement_met, bool* is_placed, |
| LayoutUnit* placed_offset) OVERRIDE; |
| |
| const scoped_refptr<Paragraph> paragraph_; |
| int32 text_position_; |
| |
| // This flag indicates that the box is fully hidden by the ellipsis and it, |
| // along with its contents will not be visible. |
| // "Implementations must hide characters and atomic inline-level elements at |
| // the applicable edge(s) of the line as necessary to fit the ellipsis." |
| // https://www.w3.org/TR/css3-ui/#propdef-text-overflow |
| bool is_hidden_by_ellipsis_; |
| }; |
| |
| } // namespace layout |
| } // namespace cobalt |
| |
| #endif // COBALT_LAYOUT_BLOCK_FORMATTING_BLOCK_CONTAINER_BOX_H_ |