Struct SliverPersistentHeaderDelegate 

pub struct SliverPersistentHeaderDelegate<F> {
    pub min_extent: f64,
    pub max_extent: f64,
    pub build: F,
}

What a sliver_persistent_header shows: its extent range and how to build its content for a shrink offset — Flutter’s SliverPersistentHeaderDelegate.

build(shrink_offset, overlaps_content) receives how far the header has shrunk from max_extent (0 fully expanded, up to max_extent) and whether content is scrolling under it. An extent that is NaN, infinite or negative is treated as 0.0, and a max_extent below min_extent as min_extent.

Fields

min_extent: f64

The smallest extent the header shrinks to along the scroll axis.

max_extent: f64

The extent of the fully expanded header along the scroll axis — also how much the header scrolls.

build: F

Builds the header’s content for a shrink offset; see the type docs.

Implementations

impl<F> SliverPersistentHeaderDelegate<F>

pub fn new(min_extent: f64, max_extent: f64, build: F) -> Self

A delegate from its three parts.