Struct FilterContext 

pub struct FilterContext {
    pub box_rect: Rect,
    pub backdrop_group: Option<u64>,
}

A widget: a composable interface element.

Msg is the application message type emitted on interaction (a message-passing model, in the Elm/iced style). What the paint walk knows and a widget does not, at the moment its layer filter is asked for.

Both fields are there for the same reason: they are properties of where the widget turned out to be, not of what it was built with. A mask is written in fractions of a box, and the box is only a place on screen once layout has run; a shared backdrop belongs to the nearest enclosing group, and a widget cannot see its own ancestors.

Fields

box_rect: Rect

The widget’s own box, on screen.

backdrop_group: Option<u64>

The identity of the nearest enclosing crate::BackdropGroup, if any — the key a backdrop asking to be shared should use.

Trait Implementations

impl Clone for FilterContext

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FilterContext

impl Debug for FilterContext

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

Formats the value using the given formatter.