Struct SizeQuery 

#[repr(C)]
pub struct SizeQuery {
    pub axis: SizeQueryAxis,
    pub op: SizeQueryOp,
    pub threshold_px: f32,
    pub answer: bool,
}

One recorded window-size query made by a layout() callback.

See LayoutCallbackInfo::window_width_less_than & co. The engine replays these against a prospective new size to decide whether a resize could change the DOM at all: if no recorded answer flips (and no CSS breakpoint is crossed), the callback is provably size-stable across that resize and is not re-invoked.

Fields

axis: SizeQueryAxis

op: SizeQueryOp

threshold_px: f32

answer: bool

The answer given at recording time, evaluated against the size the callback actually saw.

Implementations

impl SizeQuery

pub fn answer_at(&self, size: LogicalSize) -> bool

What this query would answer at size — compare with Self::answer to detect a flip. MUST mirror the operators of the recording methods exactly (see SizeQueryOp), or the engine would skip a layout() re-invocation right at the boundary the app asked about.

pub fn flips_at(&self, size: LogicalSize) -> bool

Would this query’s answer differ at size from the recorded one?

Trait Implementations

impl Clone for SizeQuery

fn clone(&self) -> SizeQuery

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for SizeQuery

impl Debug for SizeQuery

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

Formats the value using the given formatter.

impl PartialEq for SizeQuery

fn eq(&self, other: &SizeQuery) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SizeQuery