Enum PanPolicy 

pub(crate) enum PanPolicy {
    Undetermined,
    NoScroll,
    Lock(PanAxis),
    Free,
}

The axis-lock policy for a pan gesture, decided at pan-start from the hit node’s touch-action and scrollable axes plus the gesture’s dominant axis.

Variants

Undetermined

Not yet decided (the hit-test/scroll-tree lookup hasn’t run). The first panning move emits the full 2D delta; the policy is set retroactively once the hit node is resolved.

NoScroll

touch-action: none (or pinch-zoom alone): no single-finger direct manipulation. Suppress scrolling and fling.

Lock(PanAxis)

Lock the gesture to a single axis (zero the other axis in the emitted delta and the velocity). Used for pan-x/pan-y, and for auto when the hit node cannot scroll the dominant axis (scroll-chaining lock).

Free

No lock: emit the full 2D delta so both axes scroll freely. Used for auto/manipulation/pan-x pan-y when the hit node can scroll the dominant axis.

Implementations

impl PanPolicy

fn pan_delta( self, delta: Vector2D<f32, DevicePixel>, ) -> Vector2D<f32, DevicePixel>

NoScroll is handled by the caller which suppresses the action entirely. Only here to keep the match exhaustive.

Trait Implementations

impl Clone for PanPolicy

fn clone(&self) -> PanPolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PanPolicy

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

Formats the value using the given formatter.

impl PartialEq for PanPolicy

fn eq(&self, other: &PanPolicy) -> 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 Copy for PanPolicy

impl StructuralPartialEq for PanPolicy