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Commit 5b139c32 authored by Joshua Tsuji's avatar Joshua Tsuji
Browse files

Adds estimateFlingEndValue to PhysicsAnimator. 

Flings do not have a set end value, and decelerate via friction until coming to a halt. However, it's sometimes useful to have an estimate of where that might be - similar logic is used by flingMustReachMinOrMax.

Test: atest SystemUITests
Change-Id: I271a1587a321b97fbbdad1c00605a17342b6e694
parent 65aa3388

packages/SystemUI/src/com/android/systemui/util/animation/PhysicsAnimator.kt

+17 −0
Original line number Diff line number Diff line
@@ -901,6 +901,23 @@ class PhysicsAnimator<T> private constructor (val target: T) { 
            verboseLogging = debug

        }



        /**

         * Estimates the end value of a fling that starts at the given value using the provided

         * start velocity and fling configuration.

         *

         * This is only an estimate. Fling animations use a timing-based physics simulation that is

         * non-deterministic, so this exact value may not be reached.

         */

        @JvmStatic

        fun estimateFlingEndValue(

            startValue: Float,

            startVelocity: Float,

            flingConfig: FlingConfig

        ): Float {

            val distance = startVelocity / (flingConfig.friction * FLING_FRICTION_SCALAR_MULTIPLIER)

            return Math.min(flingConfig.max, Math.max(flingConfig.min, startValue + distance))

        }



        @JvmStatic

        fun getReadablePropertyName(property: FloatPropertyCompat<*>): String {

            return when (property) {