Struct TouchState 

pub struct TouchState {
    pub pinch_delta: Option<f64>,
    pub rotation_delta: Option<f64>,
    pub pan_delta: Option<(f64, f64)>,
    /* private fields */
}

Multi-touch state tracker

Fields

pinch_delta: Option<f64>

Pinch gesture: distance delta between two touches

rotation_delta: Option<f64>

Rotation gesture: angle delta between two touches (radians)

pan_delta: Option<(f64, f64)>

Two-finger pan: average movement of two touches

Implementations

impl TouchState

pub fn new() -> Self

Create new empty touch state

pub fn update_touch( &mut self, id: TouchId, x: f64, y: f64, time: f64, force: Option<f64>, )

Add or update a touch point

pub fn touch_start( &mut self, id: TouchId, x: f64, y: f64, time: f64, force: Option<f64>, )

Start a new touch point (convenience wrapper)

pub fn touch_move( &mut self, id: TouchId, x: f64, y: f64, time: f64, force: Option<f64>, )

Move an existing touch point (convenience wrapper)

pub fn touch_end(&mut self, id: TouchId)

End a touch point (convenience wrapper)

pub fn touch_cancel(&mut self, id: TouchId)

Cancel a touch point (convenience wrapper for touch_end)

pub fn remove_touch(&mut self, id: TouchId)

Remove a touch point

pub fn clear(&mut self)

Clear all touches

pub fn clear_deltas(&mut self)

Clear frame-specific gesture deltas

pub fn primary_touch(&self) -> Option<&Touch>

Get the primary touch (first touch that went down)

pub fn get_touch(&self, id: TouchId) -> Option<&Touch>

Get touch by ID

pub fn touches(&self) -> impl Iterator<Item = &Touch>

Get all active touches

pub fn touch_count(&self) -> usize

Get number of active touches

pub fn has_touches(&self) -> bool

Check if any touches are active

pub fn centroid(&self) -> Option<(f64, f64)>

Get centroid (average position) of all touches

pub fn is_two_finger_gesture(&self) -> bool

Check if this is a two-finger gesture

pub fn is_pinching(&self) -> bool

Check if currently pinching

pub fn is_rotating(&self) -> bool

Check if currently rotating

pub fn is_two_finger_panning(&self) -> bool

Check if currently panning with two fingers

Trait Implementations

impl Clone for TouchState

fn clone(&self) -> TouchState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TouchState

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

Formats the value using the given formatter.

impl Default for TouchState

fn default() -> TouchState

Returns the “default value” for a type.