【Android】Jetpack Compose 入門講座 第14回「リストのスクロール①」

package com.example.myapplication

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.annotation.DrawableRes
import androidx.compose.foundation.Image
import androidx.compose.foundation.horizontalScroll
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.layout.size
import androidx.compose.foundation.layout.statusBarsPadding
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.example.myapplication.ui.theme.MyApplicationTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            MyApp()
        }
    }
}

@Composable
fun MyApp(modifier: Modifier = Modifier) {
    MyApplicationTheme {
        Surface(
            modifier = modifier
                .fillMaxSize()
                .statusBarsPadding()
        ) {
            AnimalListRow()
        }
    }
}

@Composable
fun AnimalListElement(
    @DrawableRes drawable: Int,
    text: String,
    modifier: Modifier = Modifier
) {
    Column(
        horizontalAlignment = Alignment.CenterHorizontally,
        modifier = modifier.padding(8.dp)
    ) {
        Image(
            painter = painterResource(id = drawable),
            contentDescription = text,
            contentScale = ContentScale.Crop,
            modifier = modifier
                .size(80.dp)
                .clip(CircleShape)
        )
        Text(
            text = text,
            modifier = modifier.padding(top = 4.dp)
        )
    }
}

@Composable
fun AnimalListRow(modifier: Modifier = Modifier) {
    Row(
        modifier = modifier.horizontalScroll(rememberScrollState())
    ) {
        AnimalListElement(drawable = R.drawable.dog, text = "Dog")
        AnimalListElement(drawable = R.drawable.cat, text = "Cat")
        AnimalListElement(drawable = R.drawable.rabbit, text = "Rabbit")
        AnimalListElement(drawable = R.drawable.lion, text = "Lion")
        AnimalListElement(drawable = R.drawable.panda, text = "Panda")
    }
}

@Preview
@Composable
private fun AnimalListElementPreview() {
    AnimalListElement(drawable = R.drawable.dog, text = "Dog")
}

@Preview
@Composable
private fun AnimalListRowPreview() {
    AnimalListRow()
}

@Preview
@Composable
private fun MyAppPreview() {
    MyApp()
}