Enum TransformGestureEvent 

pub enum TransformGestureEvent {
    None,
    Transform {
        pan: Point,
        zoom: f32,
        centroid: Point,
        pointer_count: usize,
    },
    Ended,
}

A transform step reported by TransformGesture::handle_event.

Variants

None

Nothing to report for this event.

Transform

The tracked pointer set moved.

Fields

pan: Point

Centroid movement since the previous sample.

zoom: f32

Multiplicative spread change since the previous sample (1.0 when fewer than two pointers are down).

centroid: Point

Centroid of all active pointers BEFORE this sample, in the same coordinates as the pointer events. This is the anchor to zoom about: applying display' = zoom * (display - centroid) + centroid + pan keeps the content glued to the fingers (it matches Compose’s calculateCentroid(useCurrent = false)).

pointer_count: usize

Number of pointers taking part in the gesture.

Ended

The last tracked pointer lifted; the gesture is over.

Trait Implementations

impl Clone for TransformGestureEvent

fn clone(&self) -> TransformGestureEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TransformGestureEvent

impl Debug for TransformGestureEvent

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

Formats the value using the given formatter.

impl PartialEq for TransformGestureEvent

fn eq(&self, other: &TransformGestureEvent) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for TransformGestureEvent