Enum BringIntoViewSpec 

pub enum BringIntoViewSpec {
    Default,
    Pivot {
        parent_fraction: f32,
        child_fraction: f32,
    },
}

Where a scroll container puts a child that asks to be seen, such as a control that takes focus. Compose’s BringIntoViewSpec, which a container reads from local_bring_into_view_spec().

Variants

Default

Scrolls as little as shows the child, and not at all while the child is in view or larger than the container. Compose’s default spec.

Pivot

Puts the child’s leading edge at a fixed place in the container on every request, so focus stays at one place while the content moves. A child that would not fit after that place ends at the container’s end instead. Compose’s pivot spec on a TV is Pivot { parent_fraction: 0.3, child_fraction: 0.0 }.

Fields

parent_fraction: f32

The place, as a fraction of the container’s size.

child_fraction: f32

How far the child sits before that place, as a fraction of the child’s size: 0.5 centers it on the place.

Implementations

impl BringIntoViewSpec

pub fn calculate_scroll_distance( self, offset: f32, size: f32, container_size: f32, ) -> f32

How far the container scrolls to put a child where this spec wants it. The child starts offset past the container’s leading edge and is size long; the container is container_size long. A positive answer moves the content toward the leading edge. Compose’s calculateScrollDistance.

Trait Implementations

impl Clone for BringIntoViewSpec

fn clone(&self) -> BringIntoViewSpec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BringIntoViewSpec

impl Debug for BringIntoViewSpec

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

Formats the value using the given formatter.

impl Default for BringIntoViewSpec

fn default() -> BringIntoViewSpec

Returns the “default value” for a type.

impl PartialEq for BringIntoViewSpec

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BringIntoViewSpec