alexmaryin

import androidx.compose.desktop.Window
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material.*
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Done
import androidx.compose.material.icons.filled.Warning
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment

alexmaryin

@HiltViewModel
class SpaceXViewModel @Inject constructor(
    repository: SpacexDataRepository,
    private val settings: Settings,
    private val translator: TranslatorApi
) : ViewModel() {

    private suspend fun translateLastUpdate(items: List<HasLastUpdate>) {
        if (settings.translateToRu)
            translator.translate(viewModelScope.coroutineContext, items, HasLastUpdate::lastUpdate, HasLastUpdate::lastUpdateRu)

alexmaryin

// in Fragment/Activity, literally, ui layer
binding.recyclerView.addItemShaker(position)

// in animations utils package with extensions
fun RecyclerView.addItemShaker(position: Int) {

    val shaker = object : RecyclerView.OnScrollListener() {
        override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
            super.onScrollStateChanged(recyclerView, newState)
            if (newState == RecyclerView.SCROLL_STATE_IDLE) {

alexmaryin

private var backPressedTime: Long = 0
private val backPressHandler = object : OnBackPressedCallback(true) {
    override fun handleOnBackPressed() {
        if (mainViewModel.currentScreen is MainScreen) {
            if (backPressedTime + 2000 > System.currentTimeMillis()) {
                activity?.finishAndRemoveTask()
            } else {
                Toast.makeText(requireContext(), "Press again to exit", Toast.LENGTH_SHORT).show()
                backPressedTime = System.currentTimeMillis()
            }

alexmaryin

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
        // ...
        requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, backPressHandler)
        // ...
    }

alexmaryin

// Game Events

sealed class GameEvent

class GameOver(val score: Int) : GameEvent()
class CopCatchEnemy(val cop: Entity, val enemy: Entity) : GameEvent()
class PlayerRestoresCop(val cop: Entity) : GameEvent()
object EnemyMissed : GameEvent()
object EnemyCaught : GameEvent()
object CopMissed : GameEvent()

alexmaryin

// On ViewModel we need to return position to scroll. Good practice is delegate it to responsible class:
fun getScrollPosition(items: List<Any>) = currentScreen.getPositionToScroll(items)

// On Fragment we need to observe event of scroll triggering:
viewModel.getScrollTrigger().collectOnFragment(this) { state ->
when (state) {
    false -> {} // Other actions if scrolling is not available, i.e. show a SnackBar
    true -> {
        viewModel.getScrollPosition(referenceList)?.let { (position, snackText) ->
            binding.recyclerView.addItemShaker(position)

alexmaryin

// BaseAdapter -> inner class DataViewHolder -> method bind
fun bind(item: Any, clickListener: AdapterClickListenerById) {
    holder.bind(binding, item, clickListener)
    binding.root.animation = AnimationUtils.loadAnimation(binding.root.context, R.anim.recycler_item_arrive)
}

// Animation file in resources
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate

alexmaryin

val shakeInterpolator = TimeInterpolator { delta ->
    val freq = 6f
    val decay = 2f
    (sin(freq * delta * Math.PI) * exp((-delta * decay).toDouble())).toFloat()
}

fun RecyclerView.addItemShaker(position: Int) {

    val shaker = object : RecyclerView.OnScrollListener() {
        override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {

alexmaryin

// 1. In Common-level gradle file set source dir for assets to one folder both for desktop and android modules

sourceSets {
        named("commonMain") {
            resources.srcDirs("resources")
            // ...
        }
    }
android { //...
    sourceSets { //...