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Initial attempt to use Jetpack Navigation in shared KMP code
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‎composeApp/build.gradle.kts‎

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@@ -77,6 +77,8 @@ kotlin {
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implementation(libs.voyager)
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implementation(libs.kmpObservableViewModel)
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implementation(libs.androidx.lifecycle.viewmodel.compose)
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implementation(libs.androidx.navigation.compose)
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implementation(libs.koalaplot)
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implementation(libs.treemap.chart)

‎composeApp/src/commonMain/kotlin/App.kt‎

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@@ -1,20 +1,238 @@
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.Spacer
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import androidx.compose.foundation.layout.fillMaxHeight
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.size
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import androidx.compose.foundation.layout.wrapContentSize
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import androidx.compose.foundation.rememberScrollState
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import androidx.compose.foundation.verticalScroll
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import androidx.compose.material.icons.Icons
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import androidx.compose.material.icons.automirrored.filled.ArrowBack
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import androidx.compose.material3.CenterAlignedTopAppBar
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import androidx.compose.material3.CircularProgressIndicator
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import androidx.compose.material3.ExperimentalMaterial3Api
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import androidx.compose.material3.Icon
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import androidx.compose.material3.IconButton
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.Scaffold
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import androidx.compose.material3.Text
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.LaunchedEffect
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import androidx.compose.runtime.collectAsState
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import androidx.compose.runtime.getValue
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.text.style.TextAlign
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import androidx.compose.ui.unit.dp
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import androidx.navigation.compose.NavHost
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import androidx.navigation.compose.composable
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import androidx.navigation.compose.rememberNavController
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import androidx.navigation.toRoute
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import cafe.adriel.voyager.navigator.Navigator
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import dev.johnoreilly.climatetrace.di.commonModule
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import dev.johnoreilly.climatetrace.remote.Country
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import dev.johnoreilly.climatetrace.ui.ClimateTraceScreen
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import dev.johnoreilly.climatetrace.ui.CountryAssetEmissionsInfoTreeMapChart
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import dev.johnoreilly.climatetrace.ui.CountryListView
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import dev.johnoreilly.climatetrace.ui.SectorEmissionsPieChart
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import dev.johnoreilly.climatetrace.ui.YearSelector
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import dev.johnoreilly.climatetrace.ui.toPercent
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import dev.johnoreilly.climatetrace.viewmodel.CountryDetailsUIState
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import dev.johnoreilly.climatetrace.viewmodel.CountryDetailsViewModel
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import dev.johnoreilly.climatetrace.viewmodel.CountryListUIState
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import dev.johnoreilly.climatetrace.viewmodel.CountryListViewModel
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import kotlinx.serialization.Serializable
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import org.jetbrains.compose.ui.tooling.preview.Preview
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import org.koin.compose.KoinApplication
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import org.koin.compose.koinInject
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@Preview
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@Composable
12-
fun App() {
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fun AppVoyagerNav() {
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KoinApplication(application = {
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modules(commonModule())
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}) {
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MaterialTheme {
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Navigator(screen = ClimateTraceScreen())
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}
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}
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}
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}
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@Serializable
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object CountryList
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@Composable
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fun AppJetpackBav() {
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KoinApplication(application = {
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modules(commonModule())
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}) {
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MaterialTheme {
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val navController = rememberNavController()
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NavHost(
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navController = navController,
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startDestination = CountryList,
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) {
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composable<CountryList> {
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CountryListScreenJetpackNav { country ->
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navController.navigate(country)
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}
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}
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composable<Country> { backStackEntry ->
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val country: Country = backStackEntry.toRoute()
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CountryInfoDetailedViewJetpackNav(country, popBack = { navController.popBackStack() })
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}
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}
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}
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}
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}
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@OptIn(ExperimentalMaterial3Api::class)
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@Composable
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fun CountryListScreenJetpackNav(countrySelected: (country: Country) -> Unit) {
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val viewModel = koinInject<CountryListViewModel>()
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val viewState by viewModel.viewState.collectAsState()
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Scaffold(
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topBar = {
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CenterAlignedTopAppBar(title = {
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Text("ClimateTraceKMP")
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}
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)
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}
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) {
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Column(Modifier.padding(it)) {
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when (val state = viewState) {
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is CountryListUIState.Loading -> {
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Column(
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modifier = Modifier.fillMaxSize().fillMaxHeight()
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.wrapContentSize(Alignment.Center)
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) {
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CircularProgressIndicator()
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}
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}
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is CountryListUIState.Error -> {}
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is CountryListUIState.Success -> {
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CountryListView(state.countryList, null, countrySelected)
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}
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}
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}
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}
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}
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@Composable
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fun CountryInfoDetailedViewJetpackNav(
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country: Country,
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popBack: () -> Unit
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) {
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val countryDetailsViewModel: CountryDetailsViewModel = koinInject()
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val countryDetailsViewState by countryDetailsViewModel.viewState.collectAsState()
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LaunchedEffect(country) {
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countryDetailsViewModel.setCountry(country)
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}
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val viewState = countryDetailsViewState
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when (viewState) {
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CountryDetailsUIState.NoCountrySelected -> {
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Column(
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modifier = Modifier.fillMaxSize()
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.wrapContentSize(Alignment.Center)
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) {
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Text(text = "No Country Selected.", style = MaterialTheme.typography.titleMedium)
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}
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}
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is CountryDetailsUIState.Loading -> {
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Column(
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modifier = Modifier.fillMaxSize()
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.wrapContentSize(Alignment.Center)
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) {
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CircularProgressIndicator()
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}
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}
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is CountryDetailsUIState.Error -> { Text("Error") }
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is CountryDetailsUIState.Success -> {
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CountryInfoDetailedViewSuccessJetpackNav(viewState, popBack) {
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countryDetailsViewModel.setYear(it)
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}
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}
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}
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}
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@OptIn(ExperimentalMaterial3Api::class)
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@Composable
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fun CountryInfoDetailedViewSuccessJetpackNav(viewState: CountryDetailsUIState.Success, popBack: () -> Unit, onYearSelected: (String) -> Unit) {
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Scaffold(
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topBar = {
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CenterAlignedTopAppBar(
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title = { Text(viewState.country.name) },
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navigationIcon = {
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IconButton(onClick = { popBack() }) {
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Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "Back")
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}
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}
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)
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}
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) {
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Column(
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modifier = Modifier
188+
.verticalScroll(rememberScrollState())
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.fillMaxSize()
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.padding(16.dp),
191+
horizontalAlignment = Alignment.CenterHorizontally
192+
) {
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Text(
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text = viewState.country.name,
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style = MaterialTheme.typography.titleLarge,
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textAlign = TextAlign.Center
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)
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Spacer(modifier = Modifier.size(16.dp))
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val year = viewState.year
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val countryAssetEmissionsList = viewState.countryAssetEmissionsList
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val countryEmissionInfo = viewState.countryEmissionInfo
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YearSelector(year, onYearSelected)
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countryEmissionInfo?.let {
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val co2 = (countryEmissionInfo.emissions.co2 / 1_000_000).toInt()
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val percentage =
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(countryEmissionInfo.emissions.co2 / countryEmissionInfo.worldEmissions.co2).toPercent(
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2
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)
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Text(text = "co2 = $co2 Million Tonnes ($year)")
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Text(text = "rank = ${countryEmissionInfo.rank} ($percentage)")
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Spacer(modifier = Modifier.size(16.dp))
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val filteredCountryAssetEmissionsList =
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countryAssetEmissionsList.filter { it.sector != null }
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if (filteredCountryAssetEmissionsList.isNotEmpty()) {
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SectorEmissionsPieChart(countryAssetEmissionsList)
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Spacer(modifier = Modifier.size(32.dp))
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CountryAssetEmissionsInfoTreeMapChart(countryAssetEmissionsList)
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} else {
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Spacer(modifier = Modifier.size(16.dp))
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Column(horizontalAlignment = Alignment.CenterHorizontally) {
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Text(
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"Invalid data",
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style = MaterialTheme.typography.titleMedium.copy(color = Color.Red),
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textAlign = TextAlign.Center
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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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}

‎composeApp/src/desktopMain/kotlin/main.kt‎

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@@ -6,13 +6,13 @@ import androidx.compose.ui.window.application
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fun main() = application {
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Window(onCloseRequest = ::exitApplication, title = "ClimateTraceKMP") {
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App()
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AppJetpackBav()
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}
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}
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@Preview
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@Composable
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fun AppDesktopPreview() {
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App()
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AppJetpackBav()
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}
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‎composeApp/src/wasmJsMain/kotlin/main.kt‎

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@@ -3,5 +3,5 @@ import androidx.compose.ui.window.CanvasBasedWindow
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@OptIn(ExperimentalComposeUiApi::class)
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fun main() {
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CanvasBasedWindow(canvasElementId = "ComposeTarget") { App() }
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CanvasBasedWindow(canvasElementId = "ComposeTarget") { AppJetpackBav() }
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}

‎gradle/libs.versions.toml‎

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@@ -10,7 +10,10 @@ android-minSdk = "24"
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android-targetSdk = "34"
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androidx-activityCompose = "1.9.0"
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compose = "1.6.8"
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compose-plugin = "1.6.11"
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compose-plugin = "1.7.0-alpha01"
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androidx-navigation = "2.8.0-alpha08"
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androidx-lifecycle = "2.8.0"
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composeWindowSize = "0.5.0"
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harawata-appdirs = "1.2.2"
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koalaplot = "0.5.3"
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[libraries]
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androidx-activity-compose = { module = "androidx.activity:activity-compose", version.ref = "androidx-activityCompose" }
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androidx-lifecycle-viewmodel-compose = { module = "org.jetbrains.androidx.lifecycle:lifecycle-viewmodel-compose", version.ref = "androidx-lifecycle" }
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androidx-navigation-compose = { module = "org.jetbrains.androidx.navigation:navigation-compose", version.ref = "androidx-navigation" }
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compose-ui = { module = "androidx.compose.ui:ui", version.ref = "compose" }
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compose-ui-tooling = { module = "androidx.compose.ui:ui-tooling", version.ref = "compose" }
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compose-ui-tooling-preview = { module = "androidx.compose.ui:ui-tooling-preview", version.ref = "compose" }
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compose-window-size = { module = "dev.chrisbanes.material3:material3-window-size-class-multiplatform", version.ref = "composeWindowSize" }

‎local.properties‎

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## This file must *NOT* be checked into Version Control Systems,
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# as it contains information specific to your local configuration.
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#
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# Location of the SDK. This is only used by Gradle.
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# For customization when using a Version Control System, please read the
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# header note.
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#Wed Apr 17 18:40:20 CEST 2024
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sdk.dir=/Users/johnoreilly/Library/Android/sdk

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