getTextDirection static method

TextDirection getTextDirection(String text)

Determines the primary text direction for a given text Returns TextDirection.rtl if the text is primarily RTL, otherwise TextDirection.ltr

Implementation

static TextDirection getTextDirection(String text) {
  if (text.isEmpty) return TextDirection.ltr;

  int rtlCount = 0;
  int ltrCount = 0;

  for (int i = 0; i < text.length; i++) {
    int codeUnit = text.codeUnitAt(i);

    // Check for RTL characters
    bool isRTL = false;
    for (List<int> range in rtlUnicodeRanges) {
      if (codeUnit >= range[0] && codeUnit <= range[1]) {
        rtlCount++;
        isRTL = true;
        break;
      }
    }

    // Check for LTR characters (Latin, numbers, etc.)
    if (!isRTL &&
        ((codeUnit >= 0x0041 && codeUnit <= 0x005A) || // A-Z
            (codeUnit >= 0x0061 && codeUnit <= 0x007A) || // a-z
            (codeUnit >= 0x0030 && codeUnit <= 0x0039) || // 0-9
            (codeUnit >= 0x00C0 && codeUnit <= 0x00FF))) {
      // Latin-1 Supplement
      ltrCount++;
    }
  }

  // If more than 30% of characters are RTL, consider the text RTL
  double rtlRatio = rtlCount / (rtlCount + ltrCount);
  return rtlRatio > 0.3 ? TextDirection.rtl : TextDirection.ltr;
}