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.utils.coroutines.flow.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     /** @see [AccessibilityManager.isEnabled] */
33     val isEnabled: Flow<Boolean>
34 
35     companion object {
invokenull36         operator fun invoke(a11yManager: AccessibilityManager): AccessibilityRepository =
37             AccessibilityRepositoryImpl(a11yManager)
38     }
39 }
40 
41 private class AccessibilityRepositoryImpl(
42     manager: AccessibilityManager,
43 ) : AccessibilityRepository {
44     override val isTouchExplorationEnabled: Flow<Boolean> =
45         conflatedCallbackFlow {
46                 val listener = TouchExplorationStateChangeListener(::trySend)
47                 manager.addTouchExplorationStateChangeListener(listener)
48                 trySend(manager.isTouchExplorationEnabled)
49                 awaitClose { manager.removeTouchExplorationStateChangeListener(listener) }
50             }
51             .distinctUntilChanged()
52 
53     override val isEnabled: Flow<Boolean> =
54         conflatedCallbackFlow {
55                 val listener = AccessibilityManager.AccessibilityStateChangeListener(::trySend)
56                 manager.addAccessibilityStateChangeListener(listener)
57                 trySend(manager.isEnabled)
58                 awaitClose { manager.removeAccessibilityStateChangeListener(listener) }
59             }
60             .distinctUntilChanged()
61 }
62 
63 @Module
64 object AccessibilityRepositoryModule {
provideReponull65     @Provides fun provideRepo(manager: AccessibilityManager) = AccessibilityRepository(manager)
66 }
67