@6 Scaffold Composable

scaffold_composable.kt

package com.rubylearner.mycomposelesson

import android.os.Bundle
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Close
import androidx.compose.material.icons.filled.Notifications
import androidx.compose.material.icons.filled.Person
import androidx.compose.material3.Badge
import androidx.compose.material3.BadgedBox
import androidx.compose.material3.CenterAlignedTopAppBar
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.FabPosition
import androidx.compose.material3.FloatingActionButton
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBarDefaults
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.rubylearner.mycomposelesson.ui.theme.MyComposeLessonTheme

//Scaffold related compose


class MainActivity : ComponentActivity() {
    @OptIn(ExperimentalMaterial3Api::class)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            MyComposeLessonTheme {
                Scaffold(
                    topBar = {
                        CenterAlignedTopAppBar(
                            colors = TopAppBarDefaults.centerAlignedTopAppBarColors()
                                .copy(
                                    containerColor = Color.Red,
                                    titleContentColor = Color.White,
                                    navigationIconContentColor = Color.White,
                                    actionIconContentColor = Color.White,
                                ),
                            title = {
                                Text("Compose Lesson")
                            },
                            navigationIcon = {
                                IconButton(
                                    onClick = {
                                        Toast.makeText(
                                            this@MainActivity,
                                            "Close",
                                            Toast.LENGTH_SHORT
                                        ).show()
                                    }
                                ) {
                                    Icon(
                                        Icons.Default.Close,
                                        contentDescription = "Close",
                                    )
                                }

                            },
                            actions = {
                                BadgedBox(
                                    badge = {
                                        Badge { Text("99") }
                                    }
                                ) {
                                    IconButton(
                                        onClick = {

                                        }
                                    ) {
                                        Icon(
                                            Icons.Default.Notifications,
                                            contentDescription = "Notification",
                                        )
                                    }
                                }
                                Text(
                                    "Setting",
                                    color = Color.White,
                                )
                            }
                        )
                    },
                    floatingActionButton = {
                        FloatingActionButton(
                            onClick = {

                            }
                        ) {
                            Icon(
                                Icons.Default.Person,
                                contentDescription = "Add"
                            )
                        }
                    },
                    floatingActionButtonPosition = FabPosition.Start,
                    bottomBar = {
                        Box(
                            modifier = Modifier
                                .fillMaxWidth()
                                .height(100.dp)
                                .background(Color.Red)
                        )
                    },

                    ) {
                    Box(modifier = Modifier.padding(it)) {
                        MyCompose()
                    }
                }
            }
        }
    }

    @Composable
    fun MyCompose() {
        Box(
            modifier = Modifier
                .size(300.dp)
                .background(
                    brush = Brush.sweepGradient(
                        colors = listOf(
                            Color.Red,
                            Color.Blue,
                            Color.Black
                        )
                    ),
                    shape = RoundedCornerShape(
                        topStart = 20.dp,
                        bottomStart = 50.dp
                    ),
                )
                .padding(bottom = 50.dp),
            contentAlignment = Alignment.Center

        ) {
            Box(
                modifier = Modifier
                    .fillMaxWidth()
                    .height(50.dp)
                    .background(Color.Red)
            )
            Box(
                modifier = Modifier
                    .width(50.dp)
                    .height(50.dp)
                    .offset(y = 25.dp)
                    .background(
                        Color.Green,
                        shape = CircleShape,
                    )
            )
            Text(
                "Box Lesson",
                fontSize = 30.sp,
                color = Color(
                    // 0 -255
                    red = 255,
                    green = 255,
                    blue = 255,
                    alpha = 255,
                ),
                modifier = Modifier
                    .align(alignment = Alignment.BottomCenter)
            )
            Text(
                "Hello world",
                color = Color.White,
            )


        }


    }


}