1 /* 2 * Copyright (C) 2023 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.intentresolver 18 19 import android.view.View 20 import android.view.animation.AlphaAnimation 21 import android.view.animation.LinearInterpolator 22 import android.view.animation.Transformation 23 import com.android.intentresolver.chooser.TargetInfo 24 25 private const val IMAGE_FADE_IN_MILLIS = 150L 26 27 internal class ItemRevealAnimationTracker { 28 private val iconProgress = HashMap<TargetInfo, Record>() 29 private val labelProgress = HashMap<TargetInfo, Record>() 30 resetnull31 fun reset() { 32 iconProgress.clear() 33 labelProgress.clear() 34 } 35 animateIconnull36 fun animateIcon(view: View, info: TargetInfo) = animateView(view, info, iconProgress) 37 fun animateLabel(view: View, info: TargetInfo) = animateView(view, info, labelProgress) 38 39 private fun animateView(view: View, info: TargetInfo, map: MutableMap<TargetInfo, Record>) { 40 val record = map.getOrPut(info) { 41 Record() 42 } 43 if ((view.animation as? RevealAnimation)?.record === record) return 44 45 view.clearAnimation() 46 if (record.alpha >= 1f) { 47 view.alpha = 1f 48 return 49 } 50 51 view.startAnimation(RevealAnimation(record)) 52 } 53 54 private class Record(var alpha: Float = 0f) 55 56 private class RevealAnimation(val record: Record) : AlphaAnimation(record.alpha, 1f) { 57 init { 58 duration = (IMAGE_FADE_IN_MILLIS * (1f - record.alpha)).toLong() 59 interpolator = LinearInterpolator() 60 } 61 applyTransformationnull62 override fun applyTransformation(interpolatedTime: Float, t: Transformation) { 63 super.applyTransformation(interpolatedTime, t) 64 // One TargetInfo can be simultaneously bou into multiple UI grid items; make sure 65 // that the alpha value only increases. This should not affect running animations, only 66 // a starting point for a new animation when a different view is bound to this target. 67 record.alpha = minOf(1f, maxOf(record.alpha, t.alpha)) 68 } 69 } 70 } 71