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class MainActivity : ComponentActivity() { | |
override fun onCreate(savedInstanceState: Bundle?) { | |
super.onCreate(savedInstanceState) | |
setContent { | |
LearnTheme { | |
Surface( | |
modifier = Modifier.fillMaxSize(), | |
color = MaterialTheme.colors.background | |
) { |
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@Composable | |
fun RestaurantScreen( | |
modifier: Modifier = Modifier | |
){ | |
val vm: RestaurantsViewModel = viewModel() | |
var myRestaurants = vm.restaurantsState | |
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class RestaurantsViewModel: ViewModel() { | |
private val _restaurantsState by mutableStateOf( | |
restaurants | |
) | |
val restaurantsState = _restaurantsState | |
fun toggleIsFavourite( | |
rid: Int, | |
) { |
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fun MutableList<Restaurant>.search( | |
query: String | |
): MutableList<Restaurant>{ | |
val result = mutableListOf<Restaurant>() | |
this.forEach {restaurant -> | |
if (restaurant.title.contains(query, ignoreCase = true) || restaurant.description.contains(query, ignoreCase = true)){ | |
result.add(restaurant) | |
} | |
} | |
return result |
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@Composable | |
fun RestaurantSearchBar( | |
modifier: Modifier = Modifier, | |
hint: String = "Search", | |
onSearch: (String) -> Unit = {} | |
) { | |
// 1. text field state | |
var text by remember { | |
mutableStateOf("") | |
} |
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@Composable | |
fun <T> T.useDebounce( | |
delayMillis: Long = 300L, | |
// 1. couroutine scope | |
coroutineScope: CoroutineScope = rememberCoroutineScope(), | |
onChange: (T) -> Unit | |
): T{ | |
// 2. updating state | |
val state by rememberUpdatedState(this) | |
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