registerTextChanged method

List<String>? registerTextChanged({ required String content, required TextSelection selection, required KeyEvent keyEvent, })

If a valid word (present in the dictionary) is being typed, a List<String> with the valid completions is returned, and null otherwise. This method should only be called if a LSPClient is not in use.

Implementation

List<String>? registerTextChanged({
  required String content,
  required TextSelection selection,
  required KeyEvent keyEvent,
}) {
  if (selection.isCollapsed) {
    if (keyEvent.logicalKey == LogicalKeyboardKey.backspace) {
      final res = _updateCompletions(
        content: content,
        selection: TextSelection.collapsed(offset: selection.baseOffset - 2),
      );

      return res;
    } else {
      final String char = HardwareKeyboard.instance.isShiftPressed
          ? keyEvent.logicalKey.keyLabel
          : keyEvent.logicalKey.keyLabel.toLowerCase();
      content = "$content$char";
      if (utils.charIsAlphaNum(char) || (const [' ', '\n']).contains(char)) {
        if (utils.charIsAlphaNum(content[selection.baseOffset])) {
          return _updateCompletions(
            content: content,
            selection: selection,
          );
        } else {
          final word = _parseWordBeforeToken(
              content: content, pos: selection.baseOffset - 1);
          // update the dictionary
          if (!dictionary.contains(word)) dictionary.add(word);
          dictionary.sort();
        }
      }
    }
  }
  showingCompletions = false;
  return currentCompletions = null;
}