Struct TouchState 

pub struct TouchState { /* private fields */ }

Tracks every active touch across every known device. Lives on App; widgets never see this directly.

Implementations

impl TouchState

pub fn new() -> Self

pub fn on_start( &mut self, device: TouchDeviceId, id: TouchId, pos: Point, force: Option<f32>, )

pub fn on_move( &mut self, device: TouchDeviceId, id: TouchId, pos: Point, force: Option<f32>, )

pub fn on_end_or_cancel(&mut self, device: TouchDeviceId, id: TouchId)

pub fn update_gesture(&mut self)

Recompute the per-frame aggregate. Called by App right before the multi-touch value is published, so every paint / on_event in the same frame sees consistent deltas.

pub fn current(&self) -> Option<MultiTouchInfo>

pub fn active_count(&self) -> usize

Total number of fingers currently down (across all devices). Useful as a lightweight “are we in a gesture?” probe when a widget doesn’t care about the per-delta aggregate.

Trait Implementations

impl Default for TouchState

fn default() -> TouchState

Returns the “default value” for a type.