AnimatedVisibilityComposeAnimation.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
import androidx.compose.ui.tooling.animation.states.AnimatedVisibilityState
/**
* Parses the [Transition] into an [AnimatedVisibilityComposeAnimation].
*/
internal fun Transition<Boolean>.parseAnimatedVisibility(): AnimatedVisibilityComposeAnimation {
return AnimatedVisibilityComposeAnimation(this, this.label ?: "AnimatedVisibility")
}
/**
* [ComposeAnimation] of type [ComposeAnimationType.ANIMATED_VISIBILITY].
*/
internal class AnimatedVisibilityComposeAnimation(
override val animationObject: Transition<Boolean>,
override val label: String?
) :
ComposeAnimation {
override val type = ComposeAnimationType.ANIMATED_VISIBILITY
override val states = setOf(AnimatedVisibilityState.Enter, AnimatedVisibilityState.Exit)
// 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>
}