jetpack compose - TopAppBar menu

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.*
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.material.Text
import androidx.compose.material.TopAppBar
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            GetScaffold()
        }
    }


    @Composable
    fun GetScaffold(){
        Scaffold(
            topBar = { TopAppBarContent() },
            content = {MainContent()},
            backgroundColor = Color(0xFFEDEAE0)
        )
    }


    @Composable
    fun TopAppBarContent() {
        val expanded = remember { mutableStateOf(false)}

        TopAppBar(
            title = { Text(text = "TopAppBar Menu")},
            backgroundColor = Color(0xFFC0E8D5),

            navigationIcon = {
                IconButton(onClick = {
                    // do something here
                }) {
                    Icon(
                        Icons.Filled.Menu,
                        contentDescription = "Localized description"
                    )
                }
            },

            actions = {
                IconButton(onClick = {
                    // do something here
                }) {
                    Icon(
                        Icons.Filled.Favorite,
                        contentDescription = "Localized description"
                    )
                }
                IconButton(onClick = {
                    // do something here
                }) {
                    Icon(
                        Icons.Filled.Delete,
                        contentDescription = "Localized description"
                    )
                }

                Box(
                    Modifier
                        .wrapContentSize(Alignment.TopEnd)
                ) {
                    IconButton(onClick = {
                        expanded.value = true
                    }) {
                        Icon(
                            Icons.Filled.MoreVert,
                            contentDescription = "Localized description"
                        )
                    }

                    DropdownMenu(
                        expanded = expanded.value,
                        onDismissRequest = { expanded.value = false },
                    ) {
                        DropdownMenuItem(onClick = {
                            expanded.value = false
                        }) {
                            Text("First Item")
                        }

                        Divider()

                        DropdownMenuItem(onClick = {
                            expanded.value = false
                        }) {
                            Text("Second Item")
                        }

                        Divider()

                        DropdownMenuItem(onClick = {
                            expanded.value = false
                        }) {
                            Text("Third Item")
                        }

                        Divider()

                        DropdownMenuItem(onClick = {
                            expanded.value = false
                        }) {
                            Text("Fourth Item")
                        }
                    }
                }
            }
        )
    }


    @Composable
    fun MainContent(){
        Box(
            modifier = Modifier.fillMaxSize(),
            contentAlignment = Alignment.Center
        ){
            Text(
                text = "Main Content",
                style = MaterialTheme.typography.h5
            )
        }
    }


    @Preview
    @Composable
    fun ComposablePreview(){
        //GetScaffold()
    }
}