Struct layout_2020::flow::inline::LineUnderConstruction

struct LineUnderConstruction {
    start_position: LogicalVec2<Au>,
    inline_position: Au,
    max_block_size: LineBlockSizes,
    has_content: bool,
    has_floats_waiting_to_be_placed: bool,
    placement_among_floats: OnceCell<LogicalRect<Au>>,
    line_items: Vec<LineItem>,
}

Information about the current line under construction for a particular InlineFormattingContextLayout. This tracks position and size information while LineItems are collected and is used as input when those LineItems are converted into Fragments during the final phase of line layout. Note that this does not store the LineItems themselves, as they are stored as part of the nesting state in the InlineFormattingContextLayout.

Fields

start_position: LogicalVec2<Au>

The position where this line will start once it is laid out. This includes any offset from text-indent.

inline_position: Au

The current inline position in the line being laid out into LineItems in this InlineFormattingContext independent of the depth in the nesting level.

max_block_size: LineBlockSizes

The maximum block size of all boxes that ended and are in progress in this line. This uses LineBlockSizes instead of a simple value, because the final block size depends on vertical alignment.

has_content: bool

Whether any active linebox has added a glyph or atomic element to this line, which indicates that the next run that exceeds the line length can cause a line break.

has_floats_waiting_to_be_placed: bool

Whether or not there are floats that did not fit on the current line. Before the LineItems of this line are laid out, these floats will need to be placed directly below this line, but still as children of this line’s Fragments.

placement_among_floats: OnceCell<LogicalRect<Au>>

A rectangular area (relative to the containing block / inline formatting context boundaries) where we can fit the line box without overlapping floats. Note that when this is not empty, its start corner takes precedence over LineUnderConstruction::start_position.

line_items: Vec<LineItem>

The LineItems for the current line under construction that have already been committed to this line.

Implementations

impl LineUnderConstruction

fn new(start_position: LogicalVec2<Au>) -> Self

fn line_block_start_considering_placement_among_floats(&self) -> Au

fn replace_placement_among_floats(&mut self, new_placement: LogicalRect<Au>)

fn trim_trailing_whitespace(&mut self) -> Au

Trim the trailing whitespace in this line and return the width of the whitespace trimmed.

fn count_justification_opportunities(&self) -> usize

Count the number of justification opportunities in this line.