Struct script::dom::resizeobserver::ResizeObservation

struct ResizeObservation {
    observed_box: RefCell<ResizeObserverBoxOptions>,
    last_reported_sizes: RefCell<Vec<ResizeObserverSizeImpl>>,
    state: RefCell<ObservationState>,
}

https://drafts.csswg.org/resize-observer/#resizeobservation

Fields

observed_box: RefCell<ResizeObserverBoxOptions>

https://drafts.csswg.org/resize-observer/#dom-resizeobservation-target Note: target is kept out of here, to avoid having to root the ResizeObservation. https://drafts.csswg.org/resize-observer/#dom-resizeobservation-observedbox

last_reported_sizes: RefCell<Vec<ResizeObserverSizeImpl>>

https://drafts.csswg.org/resize-observer/#dom-resizeobservation-lastreportedsizes

state: RefCell<ObservationState>

State machine mimicking the “active” and “skipped” targets slots of the observer.

Implementations

impl ResizeObservation

pub fn new(observed_box: ResizeObserverBoxOptions) -> ResizeObservation

https://drafts.csswg.org/resize-observer/#dom-resizeobservation-resizeobservation

fn is_active(&self, target: &Element, can_gc: CanGc) -> Option<Rect<Au>>

https://drafts.csswg.org/resize-observer/#dom-resizeobservation-isactive Returning an optional calculated size, instead of a boolean, to avoid recalculating the size in the subsequent broadcast.

Trait Implementations

impl MallocSizeOf for ResizeObservation

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

impl Traceable for ResizeObservation

unsafe fn trace(&self, tracer: *mut JSTracer)

Trace self.