1 /*
2  * 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.compose.animation.scene.transition.link
18 
19 import com.android.compose.animation.scene.SceneKey
20 import com.android.compose.animation.scene.TransitionKey
21 import com.android.compose.animation.scene.TransitionState
22 import kotlinx.coroutines.Job
23 
24 /** A linked transition which is driven by a [originalTransition]. */
25 internal class LinkedTransition(
26     private val originalTransition: TransitionState.Transition,
27     fromScene: SceneKey,
28     toScene: SceneKey,
29     override val key: TransitionKey? = null,
30 ) : TransitionState.Transition(fromScene, toScene) {
31 
32     override val currentScene: SceneKey
33         get() {
34             return when (originalTransition.currentScene) {
35                 originalTransition.fromScene -> fromScene
36                 originalTransition.toScene -> toScene
37                 else -> error("Original currentScene is neither FromScene nor ToScene")
38             }
39         }
40 
41     override val isInitiatedByUserInput: Boolean
42         get() = originalTransition.isInitiatedByUserInput
43 
44     override val isUserInputOngoing: Boolean
45         get() = originalTransition.isUserInputOngoing
46 
47     override val progress: Float
48         get() = originalTransition.progress
49 
50     override val progressVelocity: Float
51         get() = originalTransition.progressVelocity
52 
finishnull53     override fun finish(): Job = originalTransition.finish()
54 }
55