1 /* 2 * Copyright (C) 2024 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.systemui.dagger.SysUISingleton 20 import com.android.systemui.keyguard.shared.model.Edge 21 import com.android.systemui.keyguard.shared.model.KeyguardState.GONE 22 import com.android.systemui.keyguard.shared.model.KeyguardState.OCCLUDED 23 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow 24 import com.android.systemui.scene.shared.model.Scenes 25 import javax.inject.Inject 26 import kotlin.time.Duration.Companion.milliseconds 27 import kotlinx.coroutines.ExperimentalCoroutinesApi 28 import kotlinx.coroutines.flow.Flow 29 30 /** Breaks down OCCLUDED->GONE transition into discrete steps for corresponding views to consume. */ 31 @ExperimentalCoroutinesApi 32 @SysUISingleton 33 class OccludedToGoneTransitionViewModel 34 @Inject 35 constructor( 36 animationFlow: KeyguardTransitionAnimationFlow, 37 ) { 38 private val transitionAnimation = 39 animationFlow 40 .setup( 41 duration = DEFAULT_DURATION, 42 edge = Edge.create(from = OCCLUDED, to = Scenes.Gone), 43 ) 44 .setupWithoutSceneContainer( 45 edge = Edge.create(from = OCCLUDED, to = GONE), 46 ) 47 notificationAlphanull48 fun notificationAlpha(viewState: ViewStateAccessor): Flow<Float> { 49 var currentAlpha = 0f 50 return transitionAnimation.sharedFlow( 51 duration = DEFAULT_DURATION, 52 onStart = { currentAlpha = viewState.alpha() }, 53 onStep = { currentAlpha }, 54 onFinish = { 1f }, 55 ) 56 } 57 58 companion object { 59 val DEFAULT_DURATION = 300.milliseconds 60 } 61 } 62