CODEWITHSUNDEEP
kotlinviewmodelcode-reuse
Nadav
Nadav

Reputation: 11

Kotlin updating different values with a single function

I am making an app that will have multiple basic number trackers (the numbers are saved in a database), Each tracker will have a button to add or reduce the number.

Is there a way to write a function in the viewmodel for adding or reducing the number that is reusable across all of the trackers?

Example code:

@Composable
fun TrackerScreen(viewModel: TrackerViewModel) {

    val trackerUiState = viewModel.TrackerUiState.collectAsState()

    Column{
        Text("${trackerUiState.value.Tracker.valueOne}"
        Row{
            Button(onClick = { //function to increase valueOne by One })
                { Text("+1") }
            Button(onClick = { //function to reduce valueOne by One })

    Column{
        Text("${trackerUiState.value.tracker.valueTwo}"
        Row{
            Button(onClick = { //function to increase valueTwo by One })
                { Text("+1") }
            Button(onClick = { //function to reduce valueTwo by One })
// etc...

The viewmodel calls the state of the database with a dataclass (tracker) for each field

data class TrackerDetails(
    val tracker: Tracker = Tracker()
)

data class Tracker(
    val valueOne: Int = 0,
    val valueTwo: Int = 0,
    //etc...
)

I know I can set these all up as individual functions:

fun increaseTrackerOneByOne() {
    viewModelScope.launch {
        val trackerUpdate = trackerUiState.value.tracker.toTracker()
        trackerRepository.updateTracker(trackerUpdate.copy(valueOne = trackerUpdate.valueOne + 1))
    }
}

I was wondering if there was a way to set up this kind of function to work regardless of the tracker it's attached to?

(The app I'm working on will have roughly 20-30 of these trackers, if not more, so it would save me a lot of space and typing as well as following best practice of not repeating code..)

Upvotes: 0

Views: 53

Answers (1)

Nadav
Nadav

Reputation: 11

I have found a workaround for now where I have:

  • a mutableIntState number "editableNumber"
  • a where function that calls a different edit line based on editableNumber.
  • Each button sets the editableNumber to the line it wants to call.

This still requires a separate function line for each button and a composable for each button rather than being able to create them based off a list.forEach, but it's a start.

Upvotes: 0

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