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.customization.picker.settings.data.repository 18 19 import android.app.UiModeManager 20 import com.android.wallpaper.picker.di.modules.BackgroundDispatcher 21 import com.android.wallpaper.system.UiModeManagerWrapper 22 import java.util.concurrent.Executor 23 import javax.inject.Inject 24 import javax.inject.Singleton 25 import kotlinx.coroutines.CoroutineDispatcher 26 import kotlinx.coroutines.asExecutor 27 import kotlinx.coroutines.channels.awaitClose 28 import kotlinx.coroutines.flow.Flow 29 import kotlinx.coroutines.flow.callbackFlow 30 31 @Singleton 32 class ColorContrastSectionRepository 33 @Inject 34 constructor( 35 uiModeManager: UiModeManagerWrapper, 36 @BackgroundDispatcher bgDispatcher: CoroutineDispatcher, 37 ) { 38 var contrast: Flow<Float> = callbackFlow { 39 val executor: Executor = bgDispatcher.asExecutor() 40 val listener = 41 UiModeManager.ContrastChangeListener { contrast -> 42 // Emit the new contrast value whenever it changes 43 trySend(contrast) 44 } 45 46 // Emit the current contrast value immediately 47 uiModeManager.getContrast()?.let { currentContrast -> trySend(currentContrast) } 48 49 uiModeManager.addContrastChangeListener(executor, listener) 50 51 awaitClose { 52 // Unregister the listener when the flow collection is cancelled or no longer in use 53 uiModeManager.removeContrastChangeListener(listener) 54 } 55 } 56 } 57