formatTextLink function

void formatTextLink({ required TextEditingController controller, required TextSelection selection, })

Implementation

void formatTextLink({
  required TextEditingController controller,
  required TextSelection selection,
}) {
  String selectionText =
      controller.text.substring(selection.start, selection.end);
  String placeholder = 'My Link text';
  String placeholderEnd = 'https://example.com';

  if (controller.text.isNotEmpty && selectionText.isNotEmpty) {
    var newText = selectionText;

    var beforeText = controller.text.substring(0, selection.start);
    var afterText =
        controller.text.substring(selection.end, controller.text.length);

    newText = '[$newText]($placeholderEnd)';
    newText = '$beforeText$newText$afterText';

    controller.text = newText;

    controller.selection = TextSelection(
        baseOffset:
            selection.start + 3 + selectionText.length + 'https://'.length,
        extentOffset: selection.end + placeholderEnd.length + 3);
  } else {
    var beforeText = controller.text.substring(0, selection.start);
    var afterText =
        controller.text.substring(selection.end, controller.text.length);
    controller.text = '$beforeText[$placeholder]($placeholderEnd)$afterText';

    controller.selection = TextSelection(
        baseOffset:
            selection.start + 3 + placeholder.length + 'https://'.length,
        extentOffset:
            selection.end + placeholder.length + 3 + placeholderEnd.length);
  }
}