1 /*
2  * Copyright 2021 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 androidx.compose.animation.core
18 
19 import androidx.compose.runtime.withFrameMillis
20 import androidx.compose.runtime.withFrameNanos
21 import androidx.compose.ui.platform.InfiniteAnimationPolicy
22 import kotlin.coroutines.CoroutineContext
23 import kotlin.coroutines.coroutineContext
24 
25 /**
26  * Like [withFrameNanos], but applies the [InfiniteAnimationPolicy] from the calling
27  * [CoroutineContext] if there is one.
28  */
withInfiniteAnimationFrameNanosnull29 public suspend fun <R> withInfiniteAnimationFrameNanos(onFrame: (frameTimeNanos: Long) -> R): R =
30     when (val policy = coroutineContext[InfiniteAnimationPolicy]) {
31         null -> withFrameNanos(onFrame)
32         else -> policy.onInfiniteOperation { withFrameNanos(onFrame) }
33     }
34 
35 /**
36  * Like [withFrameMillis], but applies the [InfiniteAnimationPolicy] from the calling
37  * [CoroutineContext] if there is one.
38  */
39 @Suppress("UnnecessaryLambdaCreation")
withInfiniteAnimationFrameMillisnull40 public suspend inline fun <R> withInfiniteAnimationFrameMillis(
41     crossinline onFrame: (frameTimeMillis: Long) -> R
42 ): R = withInfiniteAnimationFrameNanos { onFrame(it / 1_000_000L) }
43