MainActivity.kt

package com.lahsuak.apps.jetpackcomposebasic

import android.content.res.Configuration.UI_MODE_NIGHT_YES
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.animation.core.Spring
import androidx.compose.animation.core.animateDpAsState
import androidx.compose.animation.core.spring
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material3.Button
import androidx.compose.material3.ElevatedButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.navigation.compose.rememberNavController
import com.lahsuak.apps.jetpackcomposebasic.model.AnimationItem
import com.lahsuak.apps.jetpackcomposebasic.ui.navigation.navhost.AppNavHost
import com.lahsuak.apps.jetpackcomposebasic.ui.screen.ImageBorderAnimation
import com.lahsuak.apps.jetpackcomposebasic.ui.theme.JetPackComposeBasicTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            JetPackComposeBasicTheme(dynamicColor = false) {
                AppNavHost(navController = rememberNavController())
            }
        }
    }
}

@Composable
fun MyApp(modifier: Modifier = Modifier) {
    /** PERSISTENT STATE
     * Instead of using remember you can use rememberSaveable.
    This will save each state surviving configuration changes (such as rotations) and process death.
     **/
    var shouldShowOnboarding by rememberSaveable { mutableStateOf(true) }

    Surface(modifier) {
        if (shouldShowOnboarding) {
            OnboardingScreen(onContinueClicked = { shouldShowOnboarding = false })
        } else {
            Greetings()
        }
    }
}

@Composable
fun Greeting(name: String) {
    var expanded by rememberSaveable { mutableStateOf(false) }

    val extraPadding by animateDpAsState(
        if (expanded) 48.dp else 0.dp,
        animationSpec = spring(
            dampingRatio = Spring.DampingRatioMediumBouncy,
            stiffness = Spring.StiffnessLow
        ), label = "Greeting"
    )
    Surface(
        color = MaterialTheme.colorScheme.primary,
        modifier = Modifier.padding(horizontal = 8.dp, vertical = 4.dp)
    ) {
        Row(modifier = Modifier.padding(24.dp)) {
            Column(
                modifier = Modifier
                    .weight(1f)
                    .padding(bottom = extraPadding.coerceAtLeast(0.dp))
            ) {
                Text(text = "Hello,")
                Text(
                    text = name, style = MaterialTheme.typography.headlineMedium.copy(
                        fontWeight = FontWeight.ExtraBold
                    )
                )
            }
            ElevatedButton(
                onClick = { expanded = !expanded }
            ) {
                Text(if (expanded) "Show less" else "Show more")
            }
        }
    }
}

@Composable
private fun Greetings(
    modifier: Modifier = Modifier,
    names: List<String> = List(1000) { "item $it" },
) {
    LazyColumn(modifier = modifier.padding(vertical = 4.dp)) {
        items(items = names) { name ->
            Greeting(name = name)
        }
    }
}

// add new on-boarding screen
@Composable
fun OnboardingScreen(
    onContinueClicked: () -> Unit,
    modifier: Modifier = Modifier,
) {
    Column(
        modifier = modifier.fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        Text("Welcome to the Basics Codelab!")
        Button(
            modifier = Modifier.padding(vertical = 24.dp),
            onClick = onContinueClicked
        ) {
            Text("Continue")
        }
    }
}

@Preview(showBackground = true, widthDp = 320)
@Composable
fun DefaultPreview() {
    JetPackComposeBasicTheme(dynamicColor = false) {
        Greetings()
    }
}

@Preview(
    showBackground = true,
    widthDp = 320,
    uiMode = UI_MODE_NIGHT_YES,
    name = "Dark"
)
@Preview(showBackground = true, widthDp = 320)
@Composable
fun DefaultPreviewDark() {
    JetPackComposeBasicTheme(dynamicColor = false) {
        Greetings()
    }
}

@Preview(showBackground = true, widthDp = 320, heightDp = 320)
@Composable
fun OnboardingPreview() {
    JetPackComposeBasicTheme {
        OnboardingScreen(onContinueClicked = {})
    }
}

@Preview
@Composable
fun MyAppPreview() {
    JetPackComposeBasicTheme {
        MyApp(Modifier.fillMaxSize())
    }
}