TransitionComposeAnimation.kt
/*
* Copyright 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.compose.ui.tooling.animation
import androidx.compose.animation.core.Transition
import androidx.compose.animation.tooling.ComposeAnimation
import androidx.compose.animation.tooling.ComposeAnimationType
/**
* Parses the [Transition] into a [TransitionComposeAnimation].
* [Transition] can have nullable state.
* Compose Tooling is not handling the case if [Transition.currentState] is null.
*/
internal fun Transition<*>.parse(): TransitionComposeAnimation<*>? {
return currentState?.let { state ->
val states = state.javaClass.enumConstants?.toSet() ?: setOf(state)
TransitionComposeAnimation(this, states, label ?: state::class.simpleName)
}
}
/**
* [ComposeAnimation] of type [ComposeAnimationType.TRANSITION_ANIMATION].
*/
internal class TransitionComposeAnimation<T>(
override val animationObject: Transition<T>,
override val states: Set<Any>,
override val label: String?
) : ComposeAnimation, TransitionBasedAnimation<T> {
override val type = ComposeAnimationType.TRANSITION_ANIMATION
}