Enum ScrollDelta 

pub enum ScrollDelta {
    Lines {
        x: f32,
        y: f32,
    },
    Pixels {
        x: f64,
        y: f64,
    },
}

How far a scroll event moved, in the units the device reported.

The two variants are not interchangeable and must not be collapsed by the shell: a notched wheel genuinely reports discrete clicks, a touchpad genuinely reports pixels, and the conversion factor between them is a policy decision (how many pixels is one line?) that belongs to the action layer and the UI, where it can be configured, not to a backend.

Variants

Lines

Discrete detents — y positive scrolls the content up (away from the user), matching every platform’s convention for a wheel.

Fields

x: f32

Horizontal detents.

y: f32

Vertical detents.

Pixels

Continuous motion in physical pixels, from a touchpad or high-resolution wheel. Same sign convention as ScrollDelta::Lines.

Fields

x: f64

Horizontal pixels.

y: f64

Vertical pixels.

Implementations

impl ScrollDelta

pub fn is_zero(self) -> bool

Whether this delta is exactly zero in both axes.

Wayland’s wl_pointer.axis_stop and X11’s button-4/5 emulation both produce zero-length scrolls; consumers usually want to drop them.

Trait Implementations

impl Clone for ScrollDelta

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 ScrollDelta

impl Debug for ScrollDelta

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

Formats the value using the given formatter.

impl PartialEq for ScrollDelta

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ScrollDelta