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.unfold.progress
18 
19 import android.os.Handler
20 import androidx.annotation.FloatRange
21 import com.android.systemui.unfold.UnfoldTransitionProgressProvider
22 import com.android.systemui.unfold.UnfoldTransitionProgressProvider.TransitionProgressListener
23 import com.android.systemui.unfold.dagger.UnfoldMain
24 import dagger.assisted.Assisted
25 import dagger.assisted.AssistedFactory
26 import dagger.assisted.AssistedInject
27 import java.util.Collections.synchronizedMap
28 
29 /**
30  * [UnfoldTransitionProgressProvider] that forwards all progress to the main thread handler.
31  *
32  * This is needed when progress are calculated in the background, but some listeners need the
33  * callbacks in the main thread.
34  *
35  * Note that this class assumes that the root provider has thread safe callback registration, as
36  * they might be called from any thread.
37  */
38 class MainThreadUnfoldTransitionProgressProvider
39 @AssistedInject
40 constructor(
41     @UnfoldMain private val mainHandler: Handler,
42     @Assisted private val rootProvider: UnfoldTransitionProgressProvider
43 ) : UnfoldTransitionProgressProvider {
44 
45     private val listenerMap: MutableMap<TransitionProgressListener, TransitionProgressListener> =
46         synchronizedMap(mutableMapOf())
47 
addCallbacknull48     override fun addCallback(listener: TransitionProgressListener) {
49         val proxy = TransitionProgressListerProxy(listener)
50         rootProvider.addCallback(proxy)
51         listenerMap[listener] = proxy
52     }
53 
removeCallbacknull54     override fun removeCallback(listener: TransitionProgressListener) {
55         val proxy = listenerMap.remove(listener) ?: return
56         rootProvider.removeCallback(proxy)
57     }
58 
destroynull59     override fun destroy() {
60         rootProvider.destroy()
61     }
62 
63     inner class TransitionProgressListerProxy(private val listener: TransitionProgressListener) :
64         TransitionProgressListener {
onTransitionStartednull65         override fun onTransitionStarted() {
66             mainHandler.post { listener.onTransitionStarted() }
67         }
68 
onTransitionProgressnull69         override fun onTransitionProgress(@FloatRange(from = 0.0, to = 1.0) progress: Float) {
70             mainHandler.post { listener.onTransitionProgress(progress) }
71         }
72 
onTransitionFinishingnull73         override fun onTransitionFinishing() {
74             mainHandler.post { listener.onTransitionFinishing() }
75         }
76 
onTransitionFinishednull77         override fun onTransitionFinished() {
78             mainHandler.post { listener.onTransitionFinished() }
79         }
80     }
81 
82     @AssistedFactory
83     interface Factory {
84         /** Creates a [MainThreadUnfoldTransitionProgressProvider] that wraps the [rootProvider]. */
createnull85         fun create(
86             rootProvider: UnfoldTransitionProgressProvider
87         ): MainThreadUnfoldTransitionProgressProvider
88     }
89 }
90