1 /*
<lambda>null2  * 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.util.kotlin
18 
19 import android.content.SharedPreferences
20 import com.android.systemui.utils.coroutines.flow.conflatedCallbackFlow
21 import kotlinx.coroutines.channels.awaitClose
22 import kotlinx.coroutines.flow.Flow
23 
24 object SharedPreferencesExt {
25     /** Returns a flow of [Unit] that is invoked each time shared preference is updated. */
26     fun SharedPreferences.observe(): Flow<Unit> = conflatedCallbackFlow {
27         val listener = SharedPreferences.OnSharedPreferenceChangeListener { _, _ -> trySend(Unit) }
28         registerOnSharedPreferenceChangeListener(listener)
29         awaitClose { unregisterOnSharedPreferenceChangeListener(listener) }
30     }
31 }
32