append method

void append(String appending, { bool distinct = false, })

Implementation

void append(String appending, {bool distinct = false}) {
  if (distinct && text.endsWith(appending)) {
    L.d('要求不重复添加, 直接返回');
    return;
  }

  if (selection.isValid) {
    final beforeString = text.substring(0, selection.start);
    final afterString = text.substring(selection.end);

    text = beforeString + appending + afterString;
    selection =
        TextSelection.collapsed(offset: (beforeString + appending).length);
  } else {
    // 如果没在文字内部, 就直接加到最后
    text += appending;
    selection = TextSelection.collapsed(offset: text.length);
  }
}