animateValue
@Composable
public fun <T, V : AnimationVector> InfiniteTransition.animateValue(
initialValue: T,
targetValue: T,
typeConverter: TwoWayConverter<T, V>,
animationSpec: InfiniteRepeatableSpec<T>,
label: String = "ValueAnimation",
): State<T>
Creates an animation of type T
that runs infinitely as a part of the given
InfiniteTransition
. Any data type can be animated so long as it can be converted from and to an
AnimationVector
. This conversion needs to be provided as a typeConverter
. Some examples of
such TwoWayConverter
are: Int.VectorConverter
,
Dp.VectorConverter
,
Size.VectorConverter
, etc
Once the animation is created, it will run from initialValue
to targetValue
and repeat.
Depending on the RepeatMode
of the provided animationSpec
, the animation could either restart
after each iteration (i.e. RepeatMode.Restart
), or reverse after each iteration (i.e .
RepeatMode.Reverse
).
If initialValue
or targetValue
is changed at any point during the animation, the animation
will be restarted with the new initialValue
and targetValue
. Note: this means continuity
will not be preserved.
A label
for differentiating this animation from others in android studio.
Deprecated animateValue APIs now have a new label parameter added.
@Composable
public fun <T, V : AnimationVector> InfiniteTransition.animateValue(
initialValue: T,
targetValue: T,
typeConverter: TwoWayConverter<T, V>,
animationSpec: InfiniteRepeatableSpec<T>,
): State<T>
@Composable
public inline fun <S, T, V : AnimationVector> Transition<S>.animateValue(
typeConverter: TwoWayConverter<T, V>,
noinline transitionSpec: @Composable Transition.Segment<S>.() -> FiniteAnimationSpec<T> = {
spring()
},
label: String = "ValueAnimation",
targetValueByState: @Composable (state: S) -> T,
): State<T>
Creates an animation of type T
as a part of the given Transition
. This means the states of
this animation will be managed by the Transition
. typeConverter
will be used to convert
between type T
and AnimationVector
so that the animation system knows how to animate it.
targetValueByState
is used as a mapping from a target state to the target value of this
animation. Transition
will be using this mapping to determine what value to target this
animation towards. Note that targetValueByState
is a composable function. This means the
mapping function could access states, CompositionLocals, themes, etc. If the targetValue changes
outside of a Transition
run (i.e. when the Transition
already reached its targetState), the
Transition
will start running again to ensure this animation reaches its new target smoothly.
An optional transitionSpec
can be provided to specify (potentially different) animation for
each pair of initialState and targetState. FiniteAnimationSpec
includes any non-infinite
animation, such as tween
, spring
, keyframes
and even repeatable
, but not
infiniteRepeatable
. By default, transitionSpec
uses a spring
animation for all transition
destinations.
label
is used to differentiate from other animations in the same transition in Android Studio.
Returns
A State object, the value of which is updated by animation |