getMaxWidthStrings function

List<StringData> getMaxWidthStrings(
  1. String text,
  2. TextStyle textStyle,
  3. double contentMaxWidth, {
  4. bool reverse = true,
})

计算字符串的长度如字符串的长度大于等于最大可显示的宽度，截取字符串

Implementation

List<StringData> getMaxWidthStrings(
    String text, TextStyle textStyle, double contentMaxWidth,
    {bool reverse = true}) {
  var strArrays = <StringData>[];
  if (text.isEmpty) {
    return strArrays;
  }
  var textPainter = TextPainter(
    text: TextSpan(text: text, style: textStyle),
    textAlign: TextAlign.center,
    textDirection: TextDirection.ltr,
  );
  textPainter.layout(maxWidth: contentMaxWidth);
  final computeLineMetrics = textPainter.computeLineMetrics();
  TextPosition prePosition = const TextPosition(offset: 0);
  for (var line in computeLineMetrics) {
    var textPosition = textPainter
        .getPositionForOffset(Offset(line.left + line.width, line.baseline));
    var string = text.substring(prePosition.offset, textPosition.offset);
    strArrays.add(StringData(string, line.width));
    prePosition = textPosition;
  }
  if (reverse) {
    return strArrays.reversed.toList();
  } else {
    return strArrays.toList();
  }
}