Struct NestedScrollConnection 

pub struct NestedScrollConnection {
    pub on_pre_scroll: Option<Rc<dyn Fn(Vec2) -> Vec2>>,
    pub on_post_scroll: Option<Rc<dyn Fn(Vec2) -> Vec2>>,
}

A connection between a nested scrollable and its nearest ancestor scrollable. Allows coordinated scrolling: the parent can pre-consume deltas before the child processes them, and post-consume leftovers after the child is done.

This enables patterns like collapsing toolbars (parent pre-consumes upward scroll) and pull-to-refresh (parent post-consumes overscroll from child).

Fields

on_pre_scroll: Option<Rc<dyn Fn(Vec2) -> Vec2>>

Called with the original delta before the child processes it. Return the delta remaining for the child after parent pre-consumption.

on_post_scroll: Option<Rc<dyn Fn(Vec2) -> Vec2>>

Called with the leftover delta after the child has processed it. Return the final leftover (after parent post-consumption).

Implementations

impl NestedScrollConnection

pub fn new() -> Self

pub fn pre_scroll(self, f: impl Fn(Vec2) -> Vec2 + 'static) -> Self

Pre-consume scroll before the child processes it. f receives the original delta, returns what remains for the child.

pub fn post_scroll(self, f: impl Fn(Vec2) -> Vec2 + 'static) -> Self

Post-consume leftover scroll after the child has processed it. f receives the leftover from the child, returns the final leftover.

Trait Implementations

impl Default for NestedScrollConnection

fn default() -> Self

Returns the “default value” for a type.