Hi again, I was wondering why this code is not upd...

# compose

[Nat Strangerweather]

Hi again, I was wondering why this code is not updating the color of my buttons in real time. I'd be grateful for some pointers, thanks!

[Nat Strangerweather]

val dynamicColor = remember { mutableStateOf(Color.Unspecified) }
            
            fun getDynamicColor(): Color {
                if (isEnabled)
                    when (callSender.value) {
                        0 -> dynamicColor.value = color3
                        1 -> dynamicColor.value = color1
                        2 -> dynamicColor.value = color2
                        3 -> dynamicColor.value = color0
                    } else dynamicColor.value = Color.DarkGray
                return dynamicColor.value
            }

            Button(modifier = Modifier.padding(10.dp).height(60.dp),
                elevation = ButtonDefaults.elevation(8.dp),
                colors = ButtonDefaults.buttonColors(
                    backgroundColor = getDynamicColor()
                ),

[Vsevolod Ganin]

Assuming that callSender is another mutable state, you probably want to make callSender.value an argument of getDynamicColor and pass it at call site. That way changes in callSender will trigger the whole function re-evaluation and call for getDynamicColor as a result.

The better solution would be using derivedStateOf for dynamicColor and put your mapping from callSender.value to color there.

[Nat Strangerweather]

Brilliant thanks, I'll look into derivedStateOf ! 🙂