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.systemui.keyguard.ui.viewmodel 18 19 import com.android.app.animation.Interpolators.EMPHASIZED_ACCELERATE 20 import com.android.systemui.dagger.SysUISingleton 21 import com.android.systemui.keyguard.domain.interactor.FromGoneTransitionInteractor.Companion.TO_DREAMING_DURATION 22 import com.android.systemui.keyguard.domain.interactor.KeyguardTransitionInteractor 23 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow 24 import javax.inject.Inject 25 import kotlin.time.Duration.Companion.milliseconds 26 import kotlinx.coroutines.flow.Flow 27 28 /** Breaks down GONE->DREAMING transition into discrete steps for corresponding views to consume. */ 29 @SysUISingleton 30 class GoneToDreamingTransitionViewModel 31 @Inject 32 constructor( 33 private val interactor: KeyguardTransitionInteractor, 34 ) { 35 36 private val transitionAnimation = 37 KeyguardTransitionAnimationFlow( 38 transitionDuration = TO_DREAMING_DURATION, 39 transitionFlow = interactor.goneToDreamingTransition, 40 ) 41 42 /** Lockscreen views y-translation */ 43 fun lockscreenTranslationY(translatePx: Int): Flow<Float> { 44 return transitionAnimation.createFlow( 45 duration = 500.milliseconds, 46 onStep = { it * translatePx }, 47 // Reset on cancel or finish 48 onFinish = { 0f }, 49 onCancel = { 0f }, 50 interpolator = EMPHASIZED_ACCELERATE, 51 ) 52 } 53 54 /** Lockscreen views alpha */ 55 val lockscreenAlpha: Flow<Float> = 56 transitionAnimation.createFlow( 57 duration = 250.milliseconds, 58 onStep = { 1f - it }, 59 ) 60 } 61