1 /* 2 * Copyright (C) 2025 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.mechanics.impl 18 19 import com.android.mechanics.spring.SpringParameters 20 import com.android.mechanics.spring.SpringState 21 22 /** 23 * Captures the start-state of a spring-animation to smooth over a discontinuity. 24 * 25 * Discontinuities are caused by segment changes, where the new and old segment produce different 26 * output values for the same input. 27 */ 28 internal data class DiscontinuityAnimation( 29 val targetValue: Float, 30 val springStartState: SpringState, 31 val springParameters: SpringParameters, 32 val springStartTimeNanos: Long, 33 ) { 34 val isAtRest: Boolean 35 get() = springStartState == SpringState.AtRest 36 37 companion object { 38 val None = 39 DiscontinuityAnimation( 40 targetValue = 0f, 41 springStartState = SpringState.AtRest, 42 springParameters = SpringParameters.Snap, 43 springStartTimeNanos = 0L, 44 ) 45 } 46 } 47