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 18 package com.android.systemui.keyboard.backlight.ui.viewmodel 19 20 import android.view.accessibility.AccessibilityManager 21 import com.android.systemui.dagger.SysUISingleton 22 import com.android.systemui.keyboard.backlight.domain.interactor.KeyboardBacklightInteractor 23 import com.android.systemui.statusbar.policy.AccessibilityManagerWrapper 24 import javax.inject.Inject 25 import kotlinx.coroutines.delay 26 import kotlinx.coroutines.flow.Flow 27 import kotlinx.coroutines.flow.filterNotNull 28 import kotlinx.coroutines.flow.flatMapLatest 29 import kotlinx.coroutines.flow.flow 30 import kotlinx.coroutines.flow.map 31 32 /** 33 * Responsible for dialog visibility and content - emits [BacklightDialogContentViewModel] if dialog 34 * should be shown and hidden otherwise 35 */ 36 @SysUISingleton 37 class BacklightDialogViewModel 38 @Inject 39 constructor( 40 interactor: KeyboardBacklightInteractor, 41 private val accessibilityManagerWrapper: AccessibilityManagerWrapper, 42 ) { 43 44 private val timeoutMillis: Long 45 get() = 46 accessibilityManagerWrapper 47 .getRecommendedTimeoutMillis( 48 DEFAULT_DIALOG_TIMEOUT_MILLIS, 49 AccessibilityManager.FLAG_CONTENT_ICONS 50 ) 51 .toLong() 52 53 val dialogContent: Flow<BacklightDialogContentViewModel?> = 54 interactor.backlight 55 .filterNotNull() <lambda>null56 .map { BacklightDialogContentViewModel(it.level, it.maxLevel) } 57 .timeout(timeoutMillis, emitAfterTimeout = null) 58 timeoutnull59 private fun <T> Flow<T>.timeout(timeoutMillis: Long, emitAfterTimeout: T): Flow<T> { 60 return flatMapLatest { 61 flow { 62 emit(it) 63 delay(timeoutMillis) 64 emit(emitAfterTimeout) 65 } 66 } 67 } 68 69 private companion object { 70 const val DEFAULT_DIALOG_TIMEOUT_MILLIS = 3000 71 } 72 } 73