formatEditUpdate method

  1. @override
TextEditingValue formatEditUpdate(
  1. TextEditingValue oldValue,
  2. TextEditingValue newValue
)
override

Called when text is being typed or cut/copy/pasted in the EditableText.

You can override the resulting text based on the previous text value and the incoming new text value.

When formatters are chained, oldValue reflects the initial value of TextEditingValue at the beginning of the chain.

Implementation

@override
TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
  // If the new value is empty, return as is
  if (newValue.text.isEmpty) {
    return newValue;
  }

  // Format the input as hh:mm:ss
  final String formattedValue = formatTime(newValue.text);

  // Return the updated value with caret at the end
  return TextEditingValue(
    text: formattedValue,
    selection: TextSelection.collapsed(offset: formattedValue.length),
  );
}