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.systemui.accessibility.data.repository
18 
19 import android.view.accessibility.AccessibilityManager
20 import android.view.accessibility.AccessibilityManager.TouchExplorationStateChangeListener
21 import com.android.systemui.common.coroutine.ConflatedCallbackFlow.conflatedCallbackFlow
22 import dagger.Module
23 import dagger.Provides
24 import kotlinx.coroutines.channels.awaitClose
25 import kotlinx.coroutines.flow.Flow
26 import kotlinx.coroutines.flow.distinctUntilChanged
27 
28 /** Exposes accessibility-related state. */
29 interface AccessibilityRepository {
30     /** @see [AccessibilityManager.isTouchExplorationEnabled] */
31     val isTouchExplorationEnabled: Flow<Boolean>
32 
33     companion object {
34         operator fun invoke(a11yManager: AccessibilityManager): AccessibilityRepository =
35             AccessibilityRepositoryImpl(a11yManager)
36     }
37 }
38 
39 private class AccessibilityRepositoryImpl(
40     manager: AccessibilityManager,
41 ) : AccessibilityRepository {
42     override val isTouchExplorationEnabled: Flow<Boolean> =
43         conflatedCallbackFlow {
44                 val listener = TouchExplorationStateChangeListener(::trySend)
45                 manager.addTouchExplorationStateChangeListener(listener)
46                 trySend(manager.isTouchExplorationEnabled)
47                 awaitClose { manager.removeTouchExplorationStateChangeListener(listener) }
48             }
49             .distinctUntilChanged()
50 }
51 
52 @Module
53 object AccessibilityRepositoryModule {
54     @Provides fun provideRepo(manager: AccessibilityManager) = AccessibilityRepository(manager)
55 }
56