merge static method

BorderDirectional merge(
  1. BorderDirectional a,
  2. BorderDirectional b
)

Creates a BorderDirectional that represents the addition of the two given BorderDirectionals.

It is only valid to call this if BorderSide.canMerge returns true for the pairwise combination of each side on both BorderDirectionals.

Implementation

static BorderDirectional merge(BorderDirectional a, BorderDirectional b) {
  assert(BorderSide.canMerge(a.top, b.top));
  assert(BorderSide.canMerge(a.start, b.start));
  assert(BorderSide.canMerge(a.end, b.end));
  assert(BorderSide.canMerge(a.bottom, b.bottom));
  return BorderDirectional(
    top: BorderSide.merge(a.top, b.top),
    start: BorderSide.merge(a.start, b.start),
    end: BorderSide.merge(a.end, b.end),
    bottom: BorderSide.merge(a.bottom, b.bottom),
  );
}