ComposeAnimationParser.kt
/*
* Copyright 2020 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 android.util.Log
import androidx.compose.animation.core.Transition
import androidx.compose.animation.tooling.ComposeAnimation
import androidx.compose.animation.tooling.ComposeAnimationType
// TODO(b/160126628): support other animation types, e.g. single animated value
/**
* Parses this [Transition] into a [TransitionComposeAnimation].
*/
internal fun Transition<Any>.parse(): TransitionComposeAnimation {
Log.d("ComposeAnimationParser", "Transition subscribed")
val initialState = segment.initialState
val states = initialState.javaClass.enumConstants?.toSet() ?: setOf(initialState)
return TransitionComposeAnimation(this, states, label ?: initialState::class.simpleName)
}
/**
* Parses this [Transition] into an [AnimatedVisibilityComposeAnimation].
*/
internal fun Transition<Any>.parseAnimatedVisibility(): AnimatedVisibilityComposeAnimation {
Log.d("ComposeAnimationParser", "AnimatedVisibility transition subscribed")
return AnimatedVisibilityComposeAnimation(this, this.label ?: "AnimatedVisibility")
}
/**
* [ComposeAnimation] of type [ComposeAnimationType.TRANSITION_ANIMATION].
*/
internal class TransitionComposeAnimation(
transition: Transition<Any>,
transitionStates: Set<Any>,
transitionLabel: String?
) : ComposeAnimation {
override val type = ComposeAnimationType.TRANSITION_ANIMATION
override val animationObject: Transition<Any> = transition
override val states = transitionStates
override val label = transitionLabel
}
/**
* [ComposeAnimation] of type [ComposeAnimationType.ANIMATED_VISIBILITY].
*/
internal class AnimatedVisibilityComposeAnimation(parent: Transition<Any>, parentLabel: String?) :
ComposeAnimation {
override val type = ComposeAnimationType.ANIMATED_VISIBILITY
override val animationObject: Transition<Any> = parent
override val states = setOf(AnimatedVisibilityState.Enter, AnimatedVisibilityState.Exit)
override val label = parentLabel
// Important assumption: AnimatedVisibility has a single child transition, which is a
// Transition<EnterExitState>.
@Suppress("UNCHECKED_CAST")
val childTransition: Transition<Any>?
get() = animationObject.transitions.getOrNull(0) as? Transition<Any>
}
/**
* Represents the states of [AnimatedVisibilityComposeAnimation]s.
*/
@Suppress("INLINE_CLASS_DEPRECATED")
internal inline class AnimatedVisibilityState private constructor(val value: String) {
override fun toString() = value
companion object {
val Enter = AnimatedVisibilityState("Enter")
val Exit = AnimatedVisibilityState("Exit")
}
}