I'm having some trouble on limiting the number of ...

# compose

[manueldidonna]

I'm having some trouble on limiting the number of chars of a TextFieldValue.

var selection by state { TextRange(0, 0) }
var text by state { repository.getText() }
TextField(
    value = TextFieldValue(text, selection),
    onValueChange = { 
        selection = it.selection
        // there is a a limit on the number of chars. 
        // The passed text is automatically truncated
        text = repository.updateText(it.text) 
    }
)

When I exceed the number of chars, I have some problems with the keyboard that continues to record the inputs, so I have to press the delete button more times than needed.

[Leland Richardson [G]]

can you file a bug on this? This use case should work properly. Thanks

[Val Salamakha]

If you would like to limit your text in TextField according to a selected range, you need to do it before TextField.

For example using the extract from TextField as following: 

var value by state { TextFieldValue( “123456789”, selection = TextRange(0,5) )*}*

val fullModel = state { EditorValue() }

if (fullModel.value.text != value.text || fullModel.value.selection != value.selection) {
  val newSelection = TextRange(
    value.selection.start._coerceIn_(0, value.text.length),
    value.selection.end._coerceIn_(0, value.text.length)
  )
  fullModel.value = EditorValue(
    text = value.text,
    selection = newSelection
  )
}
val text = fullModel.value.getSelectedText()

value = TextFieldValue(text)

  _TextField_(
    value = value,
    onValueChange = {
    },
    modifier = Modifier._preferredSize_(width = 200.dp, height = 56.dp)
  )