xfy
fc3c8ec882
- BackHandler 升级为 PredictiveBackHandler expect/actual - Android 13+ 启用系统级预测返回，跟手阶段同步位移/缩放页面 - Android 低版本回退至普通 BackHandler - iOS 保持空实现（无系统返回手势） - 页面返回动画统一 250ms 时长，提升流畅感 - AndroidManifest 启用 enableOnBackInvokedCallback
111 lines
4.5 KiB
Kotlin
111 lines
4.5 KiB
Kotlin
package plus.rua.project
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import androidx.compose.animation.AnimatedContent
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import androidx.compose.animation.core.tween
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import androidx.compose.animation.fadeIn
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import androidx.compose.animation.fadeOut
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import androidx.compose.animation.slideInHorizontally
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import androidx.compose.animation.slideOutHorizontally
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import androidx.compose.animation.togetherWith
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import androidx.compose.foundation.isSystemInDarkTheme
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.darkColorScheme
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import androidx.compose.material3.lightColorScheme
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableFloatStateOf
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.remember
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import androidx.compose.runtime.setValue
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.graphicsLayer
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import androidx.compose.ui.tooling.preview.Preview
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import plus.rua.project.ui.AboutScreen
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import plus.rua.project.ui.CalendarMonthView
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import plus.rua.project.ui.LicensesScreen
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private enum class Screen { Main, About, Licenses }
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/**
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* 应用入口 Composable，根据系统主题切换明暗 ColorScheme 并管理页面导航。
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*/
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@Composable
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@Preview(name = "Calendar App")
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fun App() {
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var currentScreen by remember { mutableStateOf(Screen.Main) }
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var backProgress by remember { mutableFloatStateOf(0f) }
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val handleBack: () -> Unit = {
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backProgress = 0f
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when (currentScreen) {
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Screen.About -> currentScreen = Screen.Main
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Screen.Licenses -> currentScreen = Screen.About
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else -> {}
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}
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}
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val handleCancel: () -> Unit = {
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backProgress = 0f
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}
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val colorScheme = if (isSystemInDarkTheme()) darkColorScheme() else lightColorScheme()
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MaterialTheme(colorScheme = colorScheme) {
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AnimatedContent(
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targetState = currentScreen,
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transitionSpec = {
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if (targetState.ordinal > initialState.ordinal) {
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// 正向导航：新页面从右侧滑入覆盖，旧页面略微左移+淡出
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(slideInHorizontally { it } + fadeIn()) togetherWith
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(slideOutHorizontally { -it / 4 } + fadeOut())
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} else {
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// 返回导航：新页面从左侧滑入，旧页面向右侧滑出
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(slideInHorizontally(animationSpec = tween(250)) { -it } + fadeIn(animationSpec = tween(250))) togetherWith
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(slideOutHorizontally(animationSpec = tween(250)) { it } + fadeOut(animationSpec = tween(250)))
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}
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},
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modifier = Modifier.fillMaxSize()
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) { screen ->
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when (screen) {
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Screen.Main -> CalendarMonthView(
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modifier = Modifier,
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onNavigateToAbout = { currentScreen = Screen.About }
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)
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Screen.About -> {
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PredictiveBackHandler(
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enabled = backProgress == 0f,
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onProgress = { backProgress = it },
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onBack = handleBack,
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onCancel = handleCancel
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)
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AboutScreen(
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onBack = { currentScreen = Screen.Main },
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onNavigateToLicenses = { currentScreen = Screen.Licenses },
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modifier = Modifier.graphicsLayer {
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translationX = backProgress * size.width * 0.3f
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scaleX = 1f - backProgress * 0.05f
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scaleY = 1f - backProgress * 0.05f
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}
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)
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}
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Screen.Licenses -> {
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PredictiveBackHandler(
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enabled = backProgress == 0f,
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onProgress = { backProgress = it },
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onBack = handleBack,
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onCancel = handleCancel
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)
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LicensesScreen(
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onBack = { currentScreen = Screen.About },
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modifier = Modifier.graphicsLayer {
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translationX = backProgress * size.width * 0.3f
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scaleX = 1f - backProgress * 0.05f
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scaleY = 1f - backProgress * 0.05f
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}
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)
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}
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}
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}
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}
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}
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