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.flow.Flow 28 29 /** Breaks down OCCLUDED->GONE transition into discrete steps for corresponding views to consume. */ 30 @SysUISingleton 31 class OccludedToGoneTransitionViewModel 32 @Inject 33 constructor( 34 animationFlow: KeyguardTransitionAnimationFlow, 35 ) { 36 private val transitionAnimation = 37 animationFlow 38 .setup( 39 duration = DEFAULT_DURATION, 40 edge = Edge.create(from = OCCLUDED, to = Scenes.Gone), 41 ) 42 .setupWithoutSceneContainer( 43 edge = Edge.create(from = OCCLUDED, to = GONE), 44 ) 45 notificationAlphanull46 fun notificationAlpha(viewState: ViewStateAccessor): Flow<Float> { 47 var currentAlpha = 0f 48 return transitionAnimation.sharedFlow( 49 duration = DEFAULT_DURATION, 50 onStart = { currentAlpha = viewState.alpha() }, 51 onStep = { currentAlpha }, 52 onFinish = { 1f }, 53 ) 54 } 55 56 companion object { 57 val DEFAULT_DURATION = 300.milliseconds 58 } 59 } 60