Struct WheelScroll 

pub struct WheelScroll {
    pub delta: Point,
    pub modifiers: Modifiers,
    pub uptime_millis: u64,
}

A mouse-wheel or trackpad scroll sample ready for AppShell::wheel_scrolled.

Fields

delta: Point

Scroll amount in logical pixels; positive moves content down and right (see the module docs — this is winit’s sign, not the DOM’s).

modifiers: Modifiers

Keyboard modifiers held during the sample. ctrl makes it a zoom gesture, alt turns a vertical wheel into a horizontal scroll.

uptime_millis: u64

Monotonic milliseconds, for the rotary event’s velocity tracking. Only differences between samples are meaningful.

Implementations

impl WheelScroll

pub fn new(delta: Point, uptime_millis: u64) -> Self

A sample with no modifiers held.

pub fn with_modifiers(self, modifiers: Modifiers) -> Self

This sample with modifiers held.

pub fn is_zoom(&self) -> bool

Whether this sample is the zoom gesture (ctrl+wheel, which is also how trackpad pinches arrive in a browser) rather than a scroll.

pub fn zoom_factor(&self) -> f32

The multiplicative zoom step for a ctrl+wheel sample: one notch up (positive delta) zooms in by [ZOOM_PER_NOTCH].

pub fn scroll_delta(&self) -> Point

The delta the hovered scrollable should see: with alt held, a vertical wheel drives the horizontal axis instead (the shift-less way to scroll a row on a wheel that only has a vertical axis).

Trait Implementations

impl Clone for WheelScroll

fn clone(&self) -> WheelScroll

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WheelScroll

impl Debug for WheelScroll

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

Formats the value using the given formatter.

impl PartialEq for WheelScroll

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for WheelScroll