Enum Scroll 

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

Scroll notification and requests

This is used by EventCx::set_scroll and Events::handle_scroll.

Variants

None

No scrolling

Scrolled

A child has scrolled

No further scrolling is needed but external scroll bars may need to update themselves.

Offset(Vec2)

Pan by the given offset

This is returned when pointer motion should cause scrolling but the widget handling the motion event is unable to scroll itself. The handler should attempt to scroll itself by this offset then set Scroll::Offset(remainder) (if non-zero) or Scroll::Scrolled.

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

Kinetic(KineticStart)

Start kinetic scrolling

This is returned when pointer motion should cause kinetic scrolling but the widget handling the motion event is unable to scroll itself.

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