Struct ScaleEvent 

pub struct ScaleEvent {
    pub phase: ScalePhase,
    pub scale_delta: f64,
    pub focal: Point,
    pub velocity: f64,
}

A scale (pinch/zoom) gesture event — InputEvent::Scroll’s hit-tested sibling, carrying a multiplicative delta and a focal point rather than an additive one.

Any source that reports a scale-factor change rather than individual contact moves reduces to this one event — a desktop shell’s ctrl/⌘+wheel mapping, macOS’s PinchGesture, and eventually a touch two-finger pinch recognizer — so a widget reacts to pinch-to-zoom the same way regardless of input device.

Fields

phase: ScalePhase

The gesture phase.

scale_delta: f64

The multiplicative scale change this event represents — not a running total. A consumer multiplies its own accumulated scale by this value each time an event arrives: 1.0 is a no-op, >1.0 zooms in, <1.0 zooms out.

focal: Point

Where the gesture is centered, in the receiving widget’s local logical space — the point that must stay visually fixed while scale changes. Translated like InputEvent::Pointer’s position by the container chain that routes it (see InputEvent::translated).

velocity: f64

The gesture’s current rate of scale change, per second. 0.0 when the source reports none — every shipped desktop source today, since neither a wheel notch nor winit’s PinchGesture carries a velocity — reserved for a recognizer that tracks contact velocity directly.

Trait Implementations

impl Clone for ScaleEvent

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 ScaleEvent

impl Debug for ScaleEvent

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

Formats the value using the given formatter.

impl PartialEq for ScaleEvent

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScaleEvent