Struct layout_2020::flow::inline::InlineFormattingContextLayout

pub(super) struct InlineFormattingContextLayout<'layout_data> {

    positioning_context: &'layout_data mut PositioningContext,
    containing_block: &'layout_data ContainingBlock<'layout_data>,
    sequential_layout_state: Option<&'layout_data mut SequentialLayoutState>,
    layout_context: &'layout_data LayoutContext<'layout_data>,
    ifc: &'layout_data InlineFormattingContext,
    root_nesting_level: InlineContainerState,
    inline_box_state_stack: Vec<Rc<InlineBoxContainerState>>,
    inline_box_states: Vec<Rc<InlineBoxContainerState>>,
    fragments: Vec<Fragment>,
    current_line: LineUnderConstruction,
    current_line_segment: UnbreakableSegmentUnderConstruction,
    linebreak_before_new_content: bool,
    deferred_br_clear: Clear,
    pub have_deferred_soft_wrap_opportunity: bool,
    had_inflow_content: bool,
    depends_on_block_constraints: bool,
    white_space_collapse: T,
    text_wrap_mode: T,
    baselines: Baselines,
}

Fields

positioning_context: &'layout_data mut PositioningContext

containing_block: &'layout_data ContainingBlock<'layout_data>

sequential_layout_state: Option<&'layout_data mut SequentialLayoutState>

layout_context: &'layout_data LayoutContext<'layout_data>

ifc: &'layout_data InlineFormattingContext

The InlineFormattingContext that we are laying out.

root_nesting_level: InlineContainerState

The InlineContainerState for the container formed by the root of the InlineFormattingContext. This is effectively the “root inline box” described by https://drafts.csswg.org/css-inline/#model:

The block container also generates a root inline box, which is an anonymous inline box that holds all of its inline-level contents. (Thus, all text in an inline formatting context is directly contained by an inline box, whether the root inline box or one of its descendants.) The root inline box inherits from its parent block container, but is otherwise unstyleable.

inline_box_state_stack: Vec<Rc<InlineBoxContainerState>>

A stack of InlineBoxContainerState that is used to produce LineItems either when we reach the end of an inline box or when we reach the end of a line. Only at the end of the inline box is the state popped from the stack.

inline_box_states: Vec<Rc<InlineBoxContainerState>>

A collection of InlineBoxContainerState of all the inlines that are present in this inline formatting context. We keep this as well as the stack, so that we can access them during line layout, which may happen after relevant InlineBoxContainerStates have been popped of the the stack.

fragments: Vec<Fragment>

A vector of fragment that are laid out. This includes one Fragment::Positioning per line that is currently laid out plus fragments for all floats, which are currently laid out at the top-level of each InlineFormattingContext.

current_line: LineUnderConstruction

Information about the line currently being laid out into LineItems.

current_line_segment: UnbreakableSegmentUnderConstruction

Information about the unbreakable line segment currently being laid out into LineItems.

linebreak_before_new_content: bool

After a forced line break (for instance from a <br> element) we wait to actually break the line until seeing more content. This allows ongoing inline boxes to finish, since in the case where they have no more content they should not be on the next line.

For instance:

   <span style="border-right: 30px solid blue;">
        first line<br>
   </span>
   second line

In this case, the <span> should not extend to the second line. If we linebreak as soon as we encounter the <br> the <span>’s ending inline borders would be placed on the second line, because we add those borders in InlineFormattingContextLayout::finish_inline_box().

deferred_br_clear: Clear

When a <br> element has clear, this needs to be applied after the linebreak, which will be processed after the <br> element is processed. This member stores any deferred clear to apply after a linebreak.

have_deferred_soft_wrap_opportunity: bool

Whether or not a soft wrap opportunity is queued. Soft wrap opportunities are queued after replaced content and they are processed when the next text content is encountered.

had_inflow_content: bool

Whether or not this InlineFormattingContext has processed any in flow content at all.

depends_on_block_constraints: bool

Whether or not the layout of this InlineFormattingContext depends on the block size of its container for the purposes of flexbox layout.

white_space_collapse: T

The currently white-space-collapse setting of this line. This is stored on the InlineFormattingContextLayout because when a soft wrap opportunity is defined by the boundary between two characters, the white-space-collapse property of their nearest common ancestor is used.

text_wrap_mode: T

The currently text-wrap-mode setting of this line. This is stored on the InlineFormattingContextLayout because when a soft wrap opportunity is defined by the boundary between two characters, the text-wrap-mode property of their nearest common ancestor is used.

baselines: Baselines

The offset of the first and last baselines in the inline formatting context that we are laying out. This is used to propagate baselines to the ancestors of display: inline-block elements and table content.

Implementations

impl<'layout_dta> InlineFormattingContextLayout<'layout_dta>

fn current_inline_container_state(&self) -> &InlineContainerState

fn current_inline_box_identifier(&self) -> Option<InlineBoxIdentifier>

fn current_line_max_block_size_including_nested_containers( &self, ) -> LineBlockSizes

fn propagate_current_nesting_level_white_space_style(&mut self)

fn processing_br_element(&self) -> bool

fn start_inline_box(&mut self, inline_box: &InlineBox)

Start laying out a particular InlineBox into line items. This will push a new InlineBoxContainerState onto Self::inline_box_state_stack.

fn finish_inline_box(&mut self)

Finish laying out a particular InlineBox into line items. This will pop its state off of Self::inline_box_state_stack.

fn finish_last_line(&mut self)

fn finish_current_line_and_reset( &mut self, last_line_or_forced_line_break: bool, )

Finish layout of all inline boxes for the current line. This will gather all LineItems and turn them into Fragments, then reset the InlineFormattingContextLayout preparing it for laying out a new line.

fn calculate_current_line_inline_start_and_justification_adjustment( &self, whitespace_trimmed: Au, last_line_or_forced_line_break: bool, ) -> (Au, Au)

Given the amount of whitespace trimmed from the line and taking into consideration the text-align property, calculate where the line under construction starts in the inline axis as well as the adjustment needed for every justification opportunity to account for text-align: justify.

fn place_float_fragment(&mut self, fragment: &mut BoxFragment)

fn place_float_line_item_for_commit_to_line( &mut self, float_item: &mut FloatLineItem, line_inline_size_without_trailing_whitespace: Au, )

Place a FloatLineItem. This is done when an unbreakable segment is committed to the current line. Placement of FloatLineItems might need to be deferred until the line is complete in the case that floats stop fitting on the current line.

When placing floats we do not want to take into account any trailing whitespace on the line, because that whitespace will be trimmed in the case that the line is broken. Thus this function takes as an argument the new size (without whitespace) of the line that these floats are joining.

fn place_line_among_floats( &self, potential_line_size: &LogicalVec2<Au>, ) -> LogicalRect<Au>

Given a new potential line size for the current line, create a “placement” for that line. This tells us whether or not the new potential line will fit in the current block position or need to be moved. In addition, the placement rect determines the inline start and end of the line if it’s used as the final placement among floats.

fn new_potential_line_size_causes_line_break( &mut self, potential_line_size: &LogicalVec2<Au>, ) -> bool

Returns true if a new potential line size for the current line would require a line break. This takes into account floats and will also update the “placement among floats” for this line if the potential line size would not cause a line break. Thus, calling this method has side effects and should only be done while in the process of laying out line content that is always going to be committed to this line or the next.

pub(super) fn defer_forced_line_break(&mut self)

pub(super) fn possibly_flush_deferred_forced_line_break(&mut self)

fn push_line_item_to_unbreakable_segment(&mut self, line_item: LineItem)

pub(super) fn push_glyph_store_to_unbreakable_segment( &mut self, glyph_store: Arc<GlyphStore>, text_run: &TextRun, font_index: usize, bidi_level: Level, )

fn update_unbreakable_segment_for_new_content( &mut self, block_sizes_of_content: &LineBlockSizes, inline_size: Au, flags: SegmentContentFlags, )

fn process_line_break(&mut self, forced_line_break: bool)

pub(super) fn unbreakable_segment_fits_on_line(&mut self) -> bool

pub(super) fn process_soft_wrap_opportunity(&mut self)

Process a soft wrap opportunity. This will either commit the current unbreakble segment to the current line, if it fits within the containing block and float placement boundaries, or do a line break and then commit the segment.

fn commit_current_segment_to_line(&mut self)

Commit the current unbrekable segment to the current line. In addition, this will place all floats in the unbreakable segment and expand the line dimensions.