backspace method

void backspace()

Delete one character before the cursor (Backspace behavior)

Implementation

void backspace() {
  if (_selection != null) {
    _deleteSelection();
    notifyListeners();
    return;
  }
  if (_cursorOffset > 0) {
    final before = _text.substring(0, _cursorOffset - 1);
    final after = _text.substring(_cursorOffset);
    _text = before + after;
    _cursorOffset--;
    _reparse();
    notifyListeners();
  }
}