如何设置有条件的语句以在扑朔迷离中设置类属性

Question

我想在构建小部件中调用类。number是一个整数变量。我的课程是ExpandableContainer，它具有多个属性。其中之一是expandedHeight，我想如果number小于4，expandedHeight: 58.0 * number，则expandedHeight: 58.0 * 4。

new ExpandableContainer(
              expandedHeight: 58.0*number,
              .
              .
              .
              )
.
.
.
class ExpandableContainer extends StatelessWidget {
  final bool expanded;
  final double expandedHeight;
  final Widget child;
  ExpandableContainer({
    @required this.child,
    this.expandedHeight,
    this.expanded = true,
  });
.
.
.
}

我该怎么做？

Answer 1

ternary如果使这个简单

expandedHeight: 58 * (number < 4 ? number : 4),