Implementation
set apply(NikuPopupMenuButton? v) {
if (v == null) return;
initialValue = v.initialValue ?? initialValue;
onSelected = v.onSelected ?? onSelected;
onCanceled = v.onCanceled ?? onCanceled;
tooltip = v.tooltip ?? tooltip;
elevation = v.elevation ?? elevation;
padding = v.padding ?? padding;
icon = v.icon ?? icon;
offset = v.offset ?? offset;
enabled = v.enabled ?? enabled;
shape = v.shape ?? shape;
color = v.color ?? color;
enableFeedback = v.enableFeedback ?? enableFeedback;
iconSize = v.iconSize ?? iconSize;
$parent..$merge(v.$parent);
}