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.shared.model.Edge 22 import com.android.systemui.keyguard.shared.model.KeyguardState.LOCKSCREEN 23 import com.android.systemui.keyguard.shared.model.KeyguardState.OFF 24 import com.android.systemui.keyguard.ui.KeyguardTransitionAnimationFlow 25 import com.android.systemui.keyguard.ui.transitions.DeviceEntryIconTransition 26 import javax.inject.Inject 27 import kotlin.time.Duration.Companion.milliseconds 28 import kotlinx.coroutines.flow.Flow 29 30 @SysUISingleton 31 class OffToLockscreenTransitionViewModel 32 @Inject 33 constructor(animationFlow: KeyguardTransitionAnimationFlow) : DeviceEntryIconTransition { 34 35 private val startTime = 300.milliseconds 36 private val alphaDuration = 633.milliseconds 37 val alphaStartAt = startTime / (alphaDuration + startTime) 38 39 private val transitionAnimation = 40 animationFlow.setup( 41 duration = startTime + alphaDuration, 42 edge = Edge.create(from = OFF, to = LOCKSCREEN), 43 ) 44 45 val lockscreenAlpha: Flow<Float> = 46 transitionAnimation.sharedFlow( 47 startTime = startTime, 48 duration = alphaDuration, 49 interpolator = EMPHASIZED_ACCELERATE, <lambda>null50 onStep = { it }, 51 ) 52 53 val shortcutsAlpha: Flow<Float> = lockscreenAlpha 54 55 override val deviceEntryParentViewAlpha: Flow<Float> = lockscreenAlpha 56 57 val deviceEntryBackgroundViewAlpha: Flow<Float> = lockscreenAlpha 58 } 59