/*  2023-01-18 File created by Kari Laitinen.

    (c) naturalprogramming.com

    This simple app demonstrates how we can show
    a set of items in a scrollable column.

    https://developer.android.com/jetpack/compose/lists

    Similar app made with older Android classes is
    called RecyclerViewDemo.
*/


package lazycolumn.demo

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalConfiguration
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import lazycolumn.demo.ui.theme.LazyColumnDemoTheme

@Composable
fun ComputingGuy( given_name : String )
{
   Box( contentAlignment = Alignment.Center,
        modifier = Modifier.fillMaxWidth()
           .requiredHeight( 140.dp )
           .background( Color( 0xFFFF9800.toInt() ) ) )
   {
      Text( given_name, fontSize = 28.sp )
   }
}


class LazyColumnDemoActivity : ComponentActivity()
{
   override fun onCreate(savedInstanceState: Bundle?)
   {
      super.onCreate(savedInstanceState)
      setContent {
         LazyColumnDemoTheme {
            // A surface container using the 'background' color from the theme
            Surface( modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colors.background)
            {
               //val configuration = LocalConfiguration.current

               //val screen_height = configuration.screenHeightDp.dp
               //val screen_width = configuration.screenWidthDp.dp

               val computing_guys : Array<String> =

                  arrayOf( "Steve Jobs", "Steve Wozniak", "Alan Turing",
                  "Ada Lovelace", "Linus Torvalds", "Bill Gates",
                  "Douglas Engelbart", "John von Neumann",
                  "Gary Kildall", "Tim Paterson", "Tim Berners-Lee" )

               LazyColumn(

                  // The following will put some space between
                  // the items in the column.

                  verticalArrangement = Arrangement.spacedBy( 8.dp )

                  ) {

                  // Add a single item
                  item {
                     ComputingGuy( "Charles Babbage" )
                  }

                  // Add all from the array.
                  items( computing_guys.size ) { index ->
                     ComputingGuy( computing_guys[ index ] )
                  }

                  // Add another single item
                  item {
                     ComputingGuy( "ChatGPT" )
                  }
               }
            }
         }
      }
   }
}