Enum kas_core::event::Scroll

pub enum Scroll {
    None,
    Scrolled,
    Offset(Offset),
    Rect(Rect),
}

Request to / notification of scrolling from a child

See: EventCx::set_scroll.

Variants

None

No scrolling

Scrolled

Child has scrolled; no further scrolling needed

External scroll bars use this as a notification to update self.

Offset(Offset)

Pan region by the given offset

This may be returned to scroll the closest scrollable ancestor region. This region should attempt to scroll self by this offset, then, if all the offset was used, return Scroll::Scrolled, otherwise return Scroll::Offset(delta) with the unused offset delta.

With the usual scroll offset conventions, this delta must be subtracted from the scroll offset.

Rect(Rect)

Focus the given rect

Trait Implementations

impl Clone for Scroll

fn clone(&self) -> Scroll

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Scroll

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

Formats the value using the given formatter.

impl Default for Scroll

fn default() -> Scroll

Returns the “default value” for a type.

impl Hash for Scroll

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq<Scroll> for Scroll

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Scroll

impl Eq for Scroll

impl StructuralEq for Scroll

impl StructuralPartialEq for Scroll