Enum Scroll 

pub enum Scroll {
    None,
    Scrolled,
    Offset(Vec2),
    Kinetic(KineticStart),
    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(Vec2)

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.

Kinetic(KineticStart)

Start kinetic scrolling

Rect(Rect)

Focus the given rect

This is specified in the child’s coordinate space. It is assumed that any parent with non-zero translation will intercept this value and either consume or translate it.

Trait Implementations

impl Clone for Scroll

fn clone(&self) -> Scroll

Returns a duplicate 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 PartialEq for Scroll

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Sub<Offset> for Scroll

type Output = Scroll

The resulting type after applying the - operator.

fn sub(self, rhs: Offset) -> Self

Performs the - operation.

impl StructuralPartialEq for Scroll