Enum WheelDelta 

pub enum WheelDelta {
    Lines(f32, f32),
    Pixels(f64, f64),
}

Scroll delta — distinguishes scroll source.

Chrome equivalent: WebMouseWheelEvent::delta_x/y + has_precise_scrolling_deltas flag.

Mouse wheels produce line deltas (discrete ticks). Trackpads produce pixel deltas (smooth, precise). The distinction matters for scroll behavior — line deltas get multiplied by a line height, pixel deltas are used directly.

Variants

Lines(f32, f32)

Mouse wheel: discrete line ticks. Positive = scroll up/left. Chrome: delta_x/y when has_precise_scrolling_deltas is false.

Pixels(f64, f64)

Trackpad: precise pixel offset. Positive = scroll up/left. Chrome: delta_x/y when has_precise_scrolling_deltas is true.

Implementations

impl WheelDelta

pub fn dx(&self) -> f64

Raw horizontal component (lines or pixels, unscaled).

pub fn dy(&self) -> f64

Raw vertical component (lines or pixels, unscaled).

pub fn px_dx(&self) -> f32

Horizontal delta in CSS pixels. Lines are scaled by PIXELS_PER_LINE.

pub fn px_dy(&self) -> f32

Vertical delta in CSS pixels. Lines are scaled by PIXELS_PER_LINE.

Trait Implementations

impl Clone for WheelDelta

fn clone(&self) -> WheelDelta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WheelDelta

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

Formats the value using the given formatter.

impl PartialEq for WheelDelta

fn eq(&self, other: &WheelDelta) -> 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 WheelDelta

impl StructuralPartialEq for WheelDelta