toEdgeInsets property

EdgeInsets? get toEdgeInsets

将数组转为内边距对象，其数组结构与 CSS 一致：

  • 10 - 所有
  • 10, 20 - 上下 | 左右
  • 10, 20, 10 - 上 | 左右 | 下
  • 10, 20, 10, 20 - 上 | 右 | 下 | 左

Implementation

EdgeInsets? get toEdgeInsets {
  if (isEmpty) return null;

  if (length == 1) {
    return EdgeInsets.all(first);
  } else if (length == 2) {
    return EdgeInsets.symmetric(vertical: first, horizontal: last);
  } else {
    if (length == 3) {
      return EdgeInsets.only(
        top: this[0],
        left: this[1],
        right: this[1],
        bottom: this[2],
      );
    } else {
      return EdgeInsets.only(
        top: this[0],
        right: this[1],
        bottom: this[2],
        left: this[3],
      );
    }
  }
}