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MainActivity.kt
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MainActivity.kt
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/*
* 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
*
* https://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.samples.crane.home
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.annotation.VisibleForTesting
import androidx.compose.animation.core.MutableTransitionState
import androidx.compose.animation.core.Spring.StiffnessLow
import androidx.compose.animation.core.animateDp
import androidx.compose.animation.core.animateFloat
import androidx.compose.animation.core.spring
import androidx.compose.animation.core.tween
import androidx.compose.animation.core.updateTransition
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.WindowInsetsSides
import androidx.compose.foundation.layout.navigationBars
import androidx.compose.foundation.layout.only
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.windowInsetsPadding
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material3.windowsizeclass.ExperimentalMaterial3WindowSizeClassApi
import androidx.compose.material3.windowsizeclass.WindowWidthSizeClass
import androidx.compose.material3.windowsizeclass.calculateWindowSizeClass
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.samples.crane.calendar.CalendarScreen
import androidx.compose.samples.crane.details.launchDetailsActivity
import androidx.compose.samples.crane.ui.CraneTheme
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.alpha
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import androidx.core.view.WindowCompat
import androidx.hilt.navigation.compose.hiltViewModel
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
import dagger.hilt.android.AndroidEntryPoint
@OptIn(ExperimentalMaterial3WindowSizeClassApi::class)
@AndroidEntryPoint
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
WindowCompat.setDecorFitsSystemWindows(window, false)
setContent {
CraneTheme {
val widthSizeClass = calculateWindowSizeClass(this).widthSizeClass
val navController = rememberNavController()
NavHost(navController = navController, startDestination = Routes.Home.route) {
composable(Routes.Home.route) {
val mainViewModel = hiltViewModel<MainViewModel>()
MainScreen(
widthSize = widthSizeClass,
onExploreItemClicked = {
launchDetailsActivity(context = this@MainActivity, item = it)
},
onDateSelectionClicked = {
navController.navigate(Routes.Calendar.route)
},
mainViewModel = mainViewModel
)
}
composable(Routes.Calendar.route) {
val parentEntry = remember {
navController.getBackStackEntry(Routes.Home.route)
}
val parentViewModel = hiltViewModel<MainViewModel>(
parentEntry
)
CalendarScreen(onBackPressed = {
navController.popBackStack()
}, mainViewModel = parentViewModel)
}
}
}
}
}
}
sealed class Routes(val route: String) {
object Home : Routes("home")
object Calendar : Routes("calendar")
}
@VisibleForTesting
@Composable
fun MainScreen(
widthSize: WindowWidthSizeClass,
onExploreItemClicked: OnExploreItemClicked,
onDateSelectionClicked: () -> Unit,
mainViewModel: MainViewModel
) {
Surface(
modifier = Modifier.windowInsetsPadding(
WindowInsets.navigationBars.only(WindowInsetsSides.Start + WindowInsetsSides.End)
),
color = MaterialTheme.colors.primary
) {
val transitionState = remember { MutableTransitionState(mainViewModel.shownSplash.value) }
val transition = updateTransition(transitionState, label = "splashTransition")
val splashAlpha by transition.animateFloat(
transitionSpec = { tween(durationMillis = 100) }, label = "splashAlpha"
) {
if (it == SplashState.Shown) 1f else 0f
}
val contentAlpha by transition.animateFloat(
transitionSpec = { tween(durationMillis = 300) }, label = "contentAlpha"
) {
if (it == SplashState.Shown) 0f else 1f
}
val contentTopPadding by transition.animateDp(
transitionSpec = { spring(stiffness = StiffnessLow) }, label = "contentTopPadding"
) {
if (it == SplashState.Shown) 100.dp else 0.dp
}
Box {
LandingScreen(
modifier = Modifier.alpha(splashAlpha),
onTimeout = {
transitionState.targetState = SplashState.Completed
mainViewModel.shownSplash.value = SplashState.Completed
}
)
MainContent(
modifier = Modifier.alpha(contentAlpha),
topPadding = contentTopPadding,
widthSize = widthSize,
onExploreItemClicked = onExploreItemClicked,
onDateSelectionClicked = onDateSelectionClicked,
viewModel = mainViewModel
)
}
}
}
@Composable
private fun MainContent(
modifier: Modifier = Modifier,
topPadding: Dp = 0.dp,
widthSize: WindowWidthSizeClass,
onExploreItemClicked: OnExploreItemClicked,
onDateSelectionClicked: () -> Unit,
viewModel: MainViewModel
) {
Column(modifier = modifier) {
Spacer(Modifier.padding(top = topPadding))
CraneHome(
widthSize = widthSize,
modifier = modifier,
onExploreItemClicked = onExploreItemClicked,
onDateSelectionClicked = onDateSelectionClicked,
viewModel = viewModel
)
}
}
enum class SplashState { Shown, Completed }