gistfile1.txt

/// Configurable state of an input field.
class InputValue {
  const InputValue({ this.text: '', this.selection });

  /// The current text being edited.
  String text;

  /// The range of text that is currently selected.
  TextSelection selection;

  static InputValue get empty => const InputValue();

  bool operator==(Object other) {
    if (other.runtimeType != runtimeType)
      return false;
    InputValue otherValue = other;
    return (otherValue.text == text) &&
           (otherValue.selection == selection);
  }
}