commonMain.cafe.adriel.voyager.transitions.ScreenTransition.kt Maven / Gradle / Ivy

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A pragmatic navigation library for Jetpack Compose

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package cafe.adriel.voyager.transitions

import androidx.compose.animation.AnimatedContent
import androidx.compose.animation.AnimatedContentTransitionScope
import androidx.compose.animation.AnimatedVisibilityScope
import androidx.compose.animation.ContentTransform
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import cafe.adriel.voyager.core.screen.Screen
import cafe.adriel.voyager.core.stack.StackEvent
import cafe.adriel.voyager.navigator.Navigator

public typealias ScreenTransitionContent = @Composable AnimatedVisibilityScope.(Screen) -> Unit

@Composable
public fun ScreenTransition(
    navigator: Navigator,
    enterTransition: AnimatedContentTransitionScope.() -> ContentTransform,
    exitTransition: AnimatedContentTransitionScope.() -> ContentTransform,
    modifier: Modifier = Modifier,
    content: ScreenTransitionContent = { it.Content() }
) {
    ScreenTransition(
        navigator = navigator,
        modifier = modifier,
        content = content,
        transition = {
            when (navigator.lastEvent) {
                StackEvent.Pop -> exitTransition()
                else -> enterTransition()
            }
        }
    )
}

@Composable
public fun ScreenTransition(
    navigator: Navigator,
    transition: AnimatedContentTransitionScope.() -> ContentTransform,
    modifier: Modifier = Modifier,
    content: ScreenTransitionContent = { it.Content() }
) {
    AnimatedContent(
        targetState = navigator.lastItem,
        transitionSpec = transition,
        modifier = modifier
    ) { screen ->
        navigator.saveableState("transition", screen) {
            content(screen)
        }
    }
}