H5_Flutter/lib/utils/util.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class Util {
  Color stringToColor(String str) {
    if (str == null || str.length == 0 || str.length != 9) {
      return Colors.white;
    }
    String strColor = str.substring(1, 9);
    int value = int.parse(strColor, radix: 16);
    return Color(value);
  }

  void setPageTitle(String title){
    SystemChrome.setApplicationSwitcherDescription(ApplicationSwitcherDescription(label: title));
  }

  Size boundingTextSize(String text,TextStyle style,double maxWidth,{int maxLines = 100}){
    TextPainter textPainter = TextPainter(
      textDirection: TextDirection.ltr,
      text: TextSpan(text: text,style: style), maxLines: maxLines
    )..layout(maxWidth: maxWidth);
    return textPainter.size;
  }

  bool didExceedMaxLines(String text,TextStyle style,double width,int maxLines){
    TextPainter _textPainter = TextPainter(
        maxLines: maxLines,
        text: TextSpan(
            text: text, style: style),
        textDirection: TextDirection.ltr)..layout(
          maxWidth: width
        );
      if (_textPainter.didExceedMaxLines){
        return true;
      }
      return false;
  }
}