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 distributed under the
11  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
12  * KIND, either express or implied. See the License for the specific language governing
13  * permissions and limitations under the License.
14  */
15 package com.android.systemui.unfold.util
16 
17 import com.android.systemui.dagger.qualifiers.Main
18 import com.android.systemui.unfold.UnfoldTransitionProgressProvider
19 import com.android.systemui.unfold.UnfoldTransitionProgressProvider.TransitionProgressListener
20 import com.android.systemui.unfold.updates.FoldProvider
21 import com.android.systemui.unfold.updates.FoldProvider.FoldCallback
22 import java.util.concurrent.Executor
23 
24 /**
25  * [UnfoldTransitionProgressProvider] that emits transition progress only when unfolding but not
26  * when folding, so we can play the animation only one way but not the other way.
27  */
28 class UnfoldOnlyProgressProvider(
29     foldProvider: FoldProvider,
30     @Main private val executor: Executor,
31     private val sourceProvider: UnfoldTransitionProgressProvider,
32     private val scopedProvider: ScopedUnfoldTransitionProgressProvider =
33         ScopedUnfoldTransitionProgressProvider(sourceProvider)
34 ) : UnfoldTransitionProgressProvider by scopedProvider {
35 
36     private var isFolded = false
37 
38     init {
39         foldProvider.registerCallback(FoldListener(), executor)
40         sourceProvider.addCallback(SourceTransitionListener())
41     }
42 
43     private inner class SourceTransitionListener : TransitionProgressListener {
44         override fun onTransitionFinished() {
45             // Disable scoped progress provider after the first unfold animation, so fold animation
46             // will not be propagated. It will be re-enabled after folding so we can play
47             // the unfold animation again.
48             if (!isFolded) {
49                 scopedProvider.setReadyToHandleTransition(false)
50             }
51         }
52     }
53 
54     private inner class FoldListener : FoldCallback {
55         override fun onFoldUpdated(isFolded: Boolean) {
56             if (isFolded) {
57                 scopedProvider.setReadyToHandleTransition(true)
58             }
59 
60             this@UnfoldOnlyProgressProvider.isFolded = isFolded
61         }
62     }
63 }
64