Struct Reader 

pub struct Reader {
    down: BTreeMap<PointerId, Pos2>,
    press: Option<Press>,
    fingers: Fingers,
    span: Option<Span>,
    pan_key: PanKey,
    shift: Shift,
    at: Option<Pos2>,
}

The latches a stream of DOM events needs to be read through: which pointers are down and where, what the press in progress drives, where the two-finger gesture stood, whether the pan key is held, and where the pointer last was.

Fields

down: BTreeMap<PointerId, Pos2>

press: Option<Press>

fingers: Fingers

span: Option<Span>

pan_key: PanKey

shift: Shift

at: Option<Pos2>

Implementations

impl Reader

pub fn pan_key(&self) -> PanKey

Whether the pan key is held, as of the last batch — what a host draws the grab cursor from.

pub fn fingers(&self) -> Fingers

How many pointers the gesture in flight has, as of the last batch.

pub fn read(&mut self, samples: &[Sample], focus: Focus) -> Read

fn pointer( &mut self, sample: &PointerSample, raw: &mut Vec<Raw>, moves: &mut Vec<Move>, ) -> bool

One pointer sample, answering whether the camera owns the frame.

fn lifted(&mut self, id: PointerId)

A pointer that is no longer down, and the gesture it leaves behind: one finger of a pair is no pinch, so the pair’s span goes with it.

fn spanned(&self) -> Option<Span>

The pair the gesture is read from, or None for fewer than two pointers down. A third finger joining does not take the gesture out from under the two that are holding it.

fn settle(&mut self)

Clear the gesture’s latches once the last pointer has lifted.

fn drives(&self, button: Button) -> Drives

Trait Implementations

impl Default for Reader

fn default() -> Reader

Returns the “default value” for a type.