flutter - 是否可以简化我对飞镖的逻辑？

Question

我将此逻辑用于动画。是否可以简化这个逻辑？

SliverAppBar FlexibleSpaceBar

  void _positionListener() {
    final FlexibleSpaceBarSettings settings = context.dependOnInheritedWidgetOfExactType();
    _fontSize = getFontSize(settings.minExtent.toInt(), settings.maxExtent.toInt(), settings.currentExtent.toInt());
setState(() {});
  }

需要简化以下逻辑

 double getFontSize(int minExtent, int maxExtent, int currentExtent){
    double onePaddingExtent = (maxExtent - minExtent) / 31;

    if (currentExtent >= minExtent && currentExtent <= minExtent + (1 * onePaddingExtent))
      return 3.0;
    else if (currentExtent > minExtent + (1 * onePaddingExtent) && currentExtent <= minExtent + (2 * onePaddingExtent))
      return 2.9;
    else if (currentExtent > minExtent + (2 * onePaddingExtent) && currentExtent <= minExtent + (3 * onePaddingExtent))
      return 2.8;
    else if (currentExtent > minExtent + (3 * onePaddingExtent) && currentExtent <= minExtent + (4 * onePaddingExtent))
      return 2.7;
    else if (currentExtent > minExtent + (4 * onePaddingExtent) && currentExtent <= minExtent + (5 * onePaddingExtent))
      return 2.6;
    else if (currentExtent > minExtent + (5 * onePaddingExtent) && currentExtent <= minExtent + (6 * onePaddingExtent))
      return 2.5;
    else if (currentExtent > minExtent + (6 * onePaddingExtent) && currentExtent <= minExtent + (7 * onePaddingExtent))
      return 2.4;
    else if (currentExtent > minExtent + (7 * onePaddingExtent) && currentExtent <= minExtent + (8 * onePaddingExtent))
      return 2.3;
    else if (currentExtent > minExtent + (8 * onePaddingExtent) && currentExtent <= minExtent + (9 * onePaddingExtent))
      return 2.2;
    else if (currentExtent > minExtent + (9 * onePaddingExtent) && currentExtent <= minExtent + (10 * onePaddingExtent))
      return 2.1;
    else if (currentExtent > minExtent + (10 * onePaddingExtent) && currentExtent <= minExtent + (11 * onePaddingExtent))
      return 2.0;
    else if (currentExtent > minExtent + (11 * onePaddingExtent) && currentExtent <= minExtent + (12 * onePaddingExtent))
      return 1.9;
    else if (currentExtent > minExtent + (12 * onePaddingExtent) && currentExtent <= minExtent + (13 * onePaddingExtent))
      return 1.8;
    else if (currentExtent > minExtent + (13 * onePaddingExtent) && currentExtent <= minExtent + (14 * onePaddingExtent))
      return 1.7;
    else if (currentExtent > minExtent + (14 * onePaddingExtent) && currentExtent <= minExtent + (15 * onePaddingExtent))
      return 1.6;
    else if (currentExtent > minExtent + (15 * onePaddingExtent) && currentExtent <= minExtent + (16 * onePaddingExtent))
      return 1.5;
    else if (currentExtent > minExtent + (16 * onePaddingExtent) && currentExtent <= minExtent + (17 * onePaddingExtent))
      return 1.4;
    else if (currentExtent > minExtent + (17 * onePaddingExtent) && currentExtent <= minExtent + (18 * onePaddingExtent))
      return 1.3;
    else if (currentExtent > minExtent + (18 * onePaddingExtent) && currentExtent <= minExtent + (19 * onePaddingExtent))
      return 1.2;
    else if (currentExtent > minExtent + (19 * onePaddingExtent) && currentExtent <= minExtent + (20 * onePaddingExtent))
      return 1.0;
    else if (currentExtent > minExtent + (20 * onePaddingExtent) && currentExtent <= minExtent + (21 * onePaddingExtent))
      return 1;
    else if (currentExtent > minExtent + (21 * onePaddingExtent) && currentExtent <= minExtent + (22 * onePaddingExtent))
      return 0.9;
    else if (currentExtent > minExtent + (22 * onePaddingExtent) && currentExtent <= minExtent + (23 * onePaddingExtent))
      return 0.8;
    else if (currentExtent > minExtent + (23 * onePaddingExtent) && currentExtent <= minExtent + (24 * onePaddingExtent))
      return 0.7;
    else if (currentExtent > minExtent + (24 * onePaddingExtent) && currentExtent <= minExtent + (25 * onePaddingExtent))
      return 0.6;
    else if (currentExtent > minExtent + (25 * onePaddingExtent) && currentExtent <= minExtent + (26 * onePaddingExtent))
      return 0.5;
    else if (currentExtent > minExtent + (26 * onePaddingExtent) && currentExtent <= minExtent + (27 * onePaddingExtent))
      return 0.4;
    else if (currentExtent > minExtent + (27 * onePaddingExtent) && currentExtent <= minExtent + (28 * onePaddingExtent))
      return 0.3;
    else if (currentExtent > minExtent + (28 * onePaddingExtent) && currentExtent <= minExtent + (29 * onePaddingExtent))
      return 0.2;
    else if (currentExtent > minExtent + (29 * onePaddingExtent) && currentExtent <= minExtent + (30 * onePaddingExtent))
      return 0.1;
    else if (currentExtent > minExtent + (30 * onePaddingExtent) && currentExtent <= minExtent + (31 * onePaddingExtent))
      return 0;
    else
      return 0;
  }

我试过这种方式，但没有工作

  double getFontSize(int minExtent, int maxExtent, int currentExtent) {
    double onePaddingExtent = (maxExtent - minExtent) / 31;
    
    var baseValue = (currentExtent + minExtent) / onePaddingExtent ;
    var upperBaseValue = baseValue.round();
    var lowerBaseValue = baseValue.floor();


    var result = 30 - Math.min(upperBaseValue, lowerBaseValue);

    return Math.max(result, 0);
  }

标签： flutterdart

Answer 1

也许你可以试试这个

if (currentExtent >= minExtent && currentExtent <= minExtent + (1 * onePaddingExtent)) return 3.0;
else for (int i = 1; i <= 30; ++ i) if ((currentExtent > minExtent + (i * onePaddingExtent)) && (currentExtent <= minExtent + ((i + 1) * onePaddingExtent))) return 3.0 - (i / 10);