Struct SliverGeometry 

pub struct SliverGeometry {
    pub scroll_extent: f64,
    pub paint_extent: f64,
    pub paint_origin: f64,
    pub layout_extent: f64,
    pub max_paint_extent: f64,
    pub hit_test_extent: f64,
    pub visible: bool,
    pub has_visual_overflow: bool,
    pub scroll_offset_correction: Option<f64>,
    pub cache_extent: f64,
}

The sliver protocol a scrolling viewport lays its children out with — a widget implements SliverWidget and overrides Widget::as_sliver to answer SliverConstraints with a SliverGeometry; a viewport lays such a child out through ChildPod::layout_sliver_child. Lifted so an app’s own sliver needs no direct frust-core dependency. What a sliver reports from layout (Flutter’s SliverGeometry), in logical px along the constraints’ axis.

Fields

scroll_extent: f64

The (estimated) total scrollable extent.

paint_extent: f64

The visible size along the axis.

paint_origin: f64

First visible pixel relative to the layout position; negative paints over an earlier sliver.

layout_extent: f64

Distance to the next sliver’s first pixel; usually paint_extent.

max_paint_extent: f64

The (estimated) paint extent given unlimited paint space.

hit_test_extent: f64

Extent of the hit region from the paint start; usually paint_extent.

visible: bool

has_visual_overflow: bool

The sliver painted outside its paint extent; the viewport must clip.

scroll_offset_correction: Option<f64>

A non-zero scroll-offset adjustment after which the viewport re-runs layout, when an earlier extent estimate was wrong.

cache_extent: f64

Cache extent consumed; at least layout_extent.

Implementations

impl SliverGeometry

pub const ZERO: SliverGeometry

An empty, invisible sliver.

pub fn new( scroll_extent: f64, paint_extent: f64, max_paint_extent: f64, ) -> SliverGeometry

Flutter’s constructor defaults: layout, hit-test and cache extents equal paint_extent, visible is paint_extent > 0, the rest zero.

pub fn debug_assert_valid(&self, constraints: &SliverConstraints)

Flutter’s SliverGeometry.debugAssertIsValid plus the paint-extent check against constraints; nothing without debug_assertions.

Trait Implementations

impl Clone for SliverGeometry

fn clone(&self) -> SliverGeometry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SliverGeometry

impl Debug for SliverGeometry

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

Formats the value using the given formatter.

impl PartialEq for SliverGeometry

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SliverGeometry