Struct FractionalOffsetTween 

pub struct FractionalOffsetTween {
    pub begin: Option<FractionalOffset>,
    pub end: Option<FractionalOffset>,
}

An interpolation between two fractional offsets.

This class specializes the interpolation of Tween<FractionalOffset> to be appropriate for fractional offsets.

See Tween for a discussion on how to use interpolation objects.

Unlike the tweens in inset_animation, this one is a value rather than an arena object: the orphan rule leaves no local type in impl Animatable<Option<FractionalOffset>> for Handle<FractionalOffsetTween>. A driven animation therefore holds a clone, and writing begin or end afterwards does not reach it.

See also:

• AlignmentTween, which interpolates between two Alignment objects.

Fields

begin: Option<FractionalOffset>

The value this variable has at the beginning of the animation.

end: Option<FractionalOffset>

The value this variable has at the end of the animation.

Implementations

impl FractionalOffsetTween

pub fn new( begin: Option<FractionalOffset>, end: Option<FractionalOffset>, ) -> FractionalOffsetTween

Creates a fractional offset tween.

The begin and end properties may be None; the None value is treated as meaning the center.

pub fn lerp(&self, t: f64) -> Option<FractionalOffset>

Returns the value this variable has at the given animation clock value.

Trait Implementations

impl Animatable<Option<FractionalOffset>> for FractionalOffsetTween

fn transform(&self, _app: &App, t: f64) -> Option<FractionalOffset>

Returns the value of the object at point t.

fn evaluate(&self, app: &App, animation: AnyAnimation<f64>) -> T

where Self: Sized,

The current value of this object for the given animation.

fn animate(self, app: &mut App, parent: AnyAnimation<f64>) -> AnyAnimation<T>

where Self: Sized + Clone + 'static, T: 'static,

Returns a new AnyAnimation that is driven by the given animation but that takes on values determined by this object.

fn chain<P>(self, parent: P) -> ChainedEvaluation<P, Self>

where Self: Sized + Clone, P: Animatable<f64> + Clone,

Returns a new Animatable whose value is determined by first evaluating the given parent and then evaluating this object at the result.

impl Clone for FractionalOffsetTween

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FractionalOffsetTween

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

Formats the value using the given formatter.