arrange static method

Implementation

static Widget arrange(List<Images> imgs) {
  if (imgs.length == 1) {
    return one(imgs[0], double.infinity, 300);
  } else if (imgs.length == 2) {
    return rowPair(imgs);
  } else if (imgs.length == 3) {
    return Row(children: [
      Flexible(flex: 5, child: one(imgs[0], 400, 300)),
      Flexible(
        flex: 2,
        child: columnPair([imgs[1], imgs[2]]),
      )
    ]);
  } else if (imgs.length == 4) {
    return Column(children: [
      rowPair([imgs[0], imgs[1]]),
      rowPair([imgs[2], imgs[3]]),
    ]);
  } else {
    // TODO over 5
    throw Exception("embed.type images length: ${imgs.length}");
  }
}