selectWordAtOffset method

TextSelection selectWordAtOffset(TextPosition position)

Implementation

TextSelection selectWordAtOffset(TextPosition position) {
  assert(
      textLayoutLastMaxWidth == constraints.maxWidth &&
          textLayoutLastMinWidth == constraints.minWidth,
      'Last width ($textLayoutLastMinWidth, $textLayoutLastMaxWidth) not the same as max width constraint (${constraints.minWidth}, ${constraints.maxWidth}).');
  final TextRange word = textPainter.getWordBoundary(position);
  TextSelection? selection;
  // When long-pressing past the end of the text, we want a collapsed cursor.
  if (position.offset >= word.end) {
    selection = TextSelection.fromPosition(position);
  }
  // If text is obscured, the entire sentence should be treated as one word.
  else if (obscureText) {
    selection = TextSelection(baseOffset: 0, extentOffset: plainText.length);
  }
  // If the word is a space, on iOS try to select the previous word instead.
  // On Android try to select the previous word instead only if the text is read only.
  else if (text?.toPlainText() != null &&
      isWhitespace(text!.toPlainText().codeUnitAt(position.offset)) &&
      position.offset > 0) {
    final TextRange? previousWord = _getPreviousWord(word.start);
    switch (defaultTargetPlatform) {
      case TargetPlatform.iOS:
        selection = TextSelection(
          baseOffset: previousWord!.start,
          extentOffset: position.offset,
        );
        break;
      case TargetPlatform.android:
        if (readOnly) {
          selection = TextSelection(
            baseOffset: previousWord!.start,
            extentOffset: position.offset,
          );
        }
        break;
      case TargetPlatform.fuchsia:
      case TargetPlatform.macOS:
      case TargetPlatform.linux:
      case TargetPlatform.windows:
        break;
    }
  }
  selection ??= TextSelection(baseOffset: word.start, extentOffset: word.end);

  /// zmt
  return hasSpecialInlineSpanBase
      ? convertTextPainterSelectionToTextInputSelection(text!, selection,
          selectWord: true)
      : selection;
}