performLayout method

  1. @override
void performLayout(
  1. Constraints constraints
)
override

Called to perform the actual layout computation for this render object.

Implementation

@override
void performLayout(Constraints constraints) {
  _ensureItemWidthsCached();
  int totalWidth = 0;
  for (final w in _cachedItemWidths) {
    totalWidth += w;
  }
  _ensureDropdownCached();
  int maxDropdownHeight = 1;
  if (openMenuIndex >= 0 && openMenuIndex < _items.length) {
    maxDropdownHeight += _items[openMenuIndex].children.length;
  }
  size = Size(totalWidth, maxDropdownHeight);
}