Struct LayoutConstraints 

pub struct LayoutConstraints<'a> {
    pub available_size: LogicalSize,
    pub writing_mode: LayoutWritingMode,
    pub bfc_state: Option<&'a mut BfcState>,
    pub text_align: TextAlign,
    pub containing_block_size: LogicalSize,
    pub available_width_type: AvailableSpace,
}

Input constraints for a layout function.

Fields

available_size: LogicalSize

The available space for the content, excluding padding and borders.

writing_mode: LayoutWritingMode

The CSS writing-mode of the context.

bfc_state: Option<&'a mut BfcState>

The state of the parent Block Formatting Context, if applicable. This is how state (like floats) is passed down.

text_align: TextAlign

containing_block_size: LogicalSize

The size of the containing block (parent’s content box). This is used for resolving percentage-based sizes and as parent_size for Taffy.

available_width_type: AvailableSpace

The semantic type of the available width constraint.

This field is crucial for correct inline layout caching:

• Definite(w): Normal layout with a specific available width
• MinContent: Intrinsic minimum width measurement (maximum wrapping)
• MaxContent: Intrinsic maximum width measurement (no wrapping)

When caching inline layouts, we must track which constraint type was used to compute the cached result. A layout computed with MinContent (width=0) must not be reused when the actual available width is known.

Trait Implementations

impl<'a> Debug for LayoutConstraints<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.