Enum ContainingBlockCalculation 

pub(crate) enum ContainingBlockCalculation<'a> {
    Lazy {
        layout_thread: &'a LayoutThread,
    },
    AlreadyDoneWithStackingContextTree,
}

A token which ensures the calculation and assignment of cumulative containing blocks to fragments in the fragment tree. This is used because these cumulative containing block offsets are set during stacking context tree construction, but some queries might need them beforehand. If the query is executed before stacking context tree construction, a quick traversal is performed to calculate them for the purpose of the query.

Variants

Lazy

This token variant is for the purpose of a layout query. In this case, if stacking context tree construction has not yet taken place, a cumulative containing block calculation traversal will be performed.

Fields

layout_thread: &'a LayoutThread

AlreadyDoneWithStackingContextTree

This token variant is used when the code can guarantee that stacking context tree construction has already taken place.

Note: Using this before stacking context tree construction can lead to incorrect layout or layout query results!

Implementations

impl ContainingBlockCalculation<'_>

pub(crate) fn ensure(&self)

Trait Implementations

impl<'a> From<&'a LayoutThread> for ContainingBlockCalculation<'a>

fn from(layout_thread: &'a LayoutThread) -> Self

Converts to this type from the input type.