Time picker state class

elsa_time_picker_5.kt

class SelectedItem(
   // Distance to the closest/selected item
   val angle: Float = 361f,
   // Index of the selected item
   val index: Int = 0,
)

class TimePickerState {

   // Angle changes
   private val _angle = Animatable(0f)
   val angle: Float
       get() = _angle.value

   // Angle state after the end of the animation
   var oldAngle: Float = 0f

   // Currently selected item
   var selectedItem = SelectedItem()

   // Animation that we will use for spins
   private val decayAnimationSpec = FloatSpringSpec(
       dampingRatio = Spring.DampingRatioNoBouncy,
       stiffness = Spring.StiffnessVeryLow,
   )

   suspend fun stop() {
       _angle.stop()
   }

   suspend fun snapTo(angle: Float) {
       _angle.snapTo(angle)
   }

   suspend fun animateTo(angle: Float) {
       // Save the new old angle as this is the last step of the animation
       oldAngle = angle
       _angle.animateTo(angle, decayAnimationSpec)
   }

   suspend fun decayTo(angle: Float, velocity: Float) {
       _angle.animateTo(
           targetValue = angle,
           initialVelocity = velocity,
           animationSpec = decayAnimationSpec,
       )
   }
}