border static method

List<Map<String, dynamic>?>? border(BoxBorder? border)

Returns a BorderDirectional from the specified list.

The list is a list of values as interpreted by borderSide. An empty or missing list results in a null return value. The list should have one through four items. Extra items are ignored.

The values are interpreted as follows:

• start: first value.
• top: second value, defaulting to same as start.
• end: third value, defaulting to same as start.
• bottom: fourth value, defaulting to same as top.

Implementation

static List<Map<String, dynamic>?>? border(BoxBorder? border) {
  if (border == null) return null;

  if (border is Border) {
    return [
      borderSide(border.left),
      borderSide(border.top),
      borderSide(border.right),
      borderSide(border.bottom),
    ];
  } else if (border is BorderDirectional) {
    return [
      borderSide(border.start),
      borderSide(border.top),
      borderSide(border.end),
      borderSide(border.bottom),
    ];
  }
  // TODO: custom border?
  return null;
}