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.settings.biometrics.fingerprint2.ui.enrollment.viewmodel
18 
19 import androidx.lifecycle.ViewModel
20 import androidx.lifecycle.ViewModelProvider
21 import androidx.lifecycle.viewmodel.initializer
22 import androidx.lifecycle.viewmodel.viewModelFactory
23 import kotlinx.coroutines.flow.MutableStateFlow
24 import kotlinx.coroutines.flow.asStateFlow
25 import kotlinx.coroutines.flow.update
26 
27 /** A class for determining if the application is in the background or not. */
28 class BackgroundViewModel : ViewModel() {
29 
30   private val _background = MutableStateFlow(false)
31   /** When true, the application is in background, else false */
32   val background = _background.asStateFlow()
33 
34   /** Indicates that the application has been put in the background. */
wentToBackgroundnull35   fun wentToBackground() {
36     _background.update { true }
37   }
38 
39   /** Indicates that the application has been brought to the foreground. */
inForegroundnull40   fun inForeground() {
41     _background.update { false }
42   }
43 
44   companion object {
<lambda>null45     val Factory: ViewModelProvider.Factory = viewModelFactory {
46       initializer { BackgroundViewModel() }
47     }
48   }
49 }
50