Validating InputField

How This Occurred

1. When validating inputs, I used .toInt() to convert a String to an Int but when the String was empty or contained characters that were non-numeric, it caused the IntParse Error
2. When I used .toInt() on a String containing only numeric values but was too long for an Int, it would throw the IntParse Error also

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How I Fixed It

1. Using .toIntOrNull() ?: 0 ( replacing 0 with the fallback value to be used if null ) instead of .toInt()
2. Enforcing a max length on the input that the user can NOT exceed
3. Enforcing 0 as a default value for a numeric InputField so it’s never empty

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Update

By Enforcing that the output of the IntInputField() composable was always numerical, I was able to revert any .toIntOrNull() statements back to .toInt() and then I applied this as soon as the variable is update rather then when using it to check validity. This meant I also had to convert the variable back to a string when passing it into the IntInputField() using .toString()

Create Table.kt

var startingChips by remember { mutableIntStateOf(1000) }
 
val startingChipsValid by remember {  
    derivedStateOf {  
        startingChips in bigBlind * 10 .. 1000000  
    }  
}
 
IntInputField(
    label = "Starting Chips",
    initialValue = startingChips.toString(),
    maxLen = 6,
    isValid = startingChipsValid,
    onValueChange = { startingChips = it.toInt() },
    modifier = Modifier.width(240.dp)
)