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.settingslib.spa.livedata 18 19 import androidx.compose.runtime.Composable 20 import androidx.compose.runtime.getValue 21 import androidx.compose.runtime.livedata.observeAsState 22 import androidx.lifecycle.LiveData 23 24 /** 25 * Starts observing this LiveData and represents its values via State and Callback. 26 * 27 * Every time there would be new value posted into the LiveData the returned State will be updated 28 * causing recomposition of every Callback usage. 29 */ 30 @Composable observeAsCallbacknull31fun <T> LiveData<T>.observeAsCallback(): () -> T? { 32 val isAllowed by observeAsState() 33 return { isAllowed } 34 } 35