Struct ScrollStates 

pub struct ScrollStates(pub FastHashMap<ExternalScrollId, ScrollState>);

Tuple Fields

0: FastHashMap<ExternalScrollId, ScrollState>

Implementations

impl ScrollStates

pub fn should_scroll_render( &mut self, (scroll_x, scroll_y): &(f32, f32), hit_test: &FullHitTest, ) -> bool

Special rendering function that skips building a layout and only does hit-testing and rendering - called on pure scroll events, since it’s significantly less CPU-intensive to just render the last display list instead of re-layouting on every single scroll event.

pub fn new() -> ScrollStates

pub fn get_scroll_position( &self, scroll_id: &ExternalScrollId, ) -> Option<LogicalPosition>

pub fn set_scroll_position( &mut self, node: &OverflowingScrollNode, scroll_position: LogicalPosition, )

Set the scroll amount - does not update the entry.used_this_frame, since that is only relevant when we are actually querying the renderer.

pub fn scroll_node( &mut self, node: &OverflowingScrollNode, scroll_by_x: f32, scroll_by_y: f32, )

Updating (add to) the existing scroll amount does not update the entry.used_this_frame, since that is only relevant when we are actually querying the renderer.

Trait Implementations

impl Debug for ScrollStates

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

Formats the value using the given formatter.

impl Default for ScrollStates

fn default() -> ScrollStates

Returns the “default value” for a type.