Struct Overscroll 

pub struct Overscroll { /* private fields */ }

Implementations

impl Overscroll

pub fn add_plan( &mut self, index: u32, plan: &FramePlan, moving: impl Fn(&str) -> bool, )

Keeps a stored plan’s placements of moving regions (moving says which layers are).

pub fn prepare<E>( &mut self, resolve: impl FnMut(&PlanPlacement, u32) -> Result<Option<(String, f64, f64)>, E>, extent: impl Fn(&str) -> Option<(i64, i64)>, ) -> Result<(), E>

Works the edges out on first use. resolve gives a placement’s final canvas and pose (None when it cannot be placed), extent its layer’s region size.

pub fn measure( &mut self, layer: &str, at: Resolved<'_>, lines: &Lines<'_>, ) -> [i64; 4]

The lines of each side (SIDES order) a placement leaves out: on a side whose pose runs past the page’s edge, the background lines counted from the region’s outer side, at most as many as the pose runs past it, and only when they reach to within [SLACK] lines of the edge. A strip with something else in it further out is left whole: leaving out only its outer part made test_8’s bounce frames paint the input bar pinned in the moving layer at shifted places, and the page end came out torn. lines holds the frame; its region is the placement’s region.

pub fn reuse(&self, layer: &str, at: Resolved<'_>) -> [i64; 4]

What the last measured placement of layer left out, when it was at this canvas and pose (a frame the duplicate shortcut does not paint).

Trait Implementations

impl Default for Overscroll

fn default() -> Self

Returns the “default value” for a type.