static BorderDirectional merge(BorderDirectional a, BorderDirectional b)
{
D.assert(a != null);
D.assert(b != null);
D.assert(BorderSide.canMerge(a.top, b.top));
D.assert(BorderSide.canMerge(a.start, b.start));
D.assert(BorderSide.canMerge(a.end, b.end));
D.assert(BorderSide.canMerge(a.bottom, b.bottom));
return(new 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)
));
}
public static Border merge(Border a, Border b)
{
D.assert(a != null);
D.assert(b != null);
D.assert(BorderSide.canMerge(a.top, b.top));
D.assert(BorderSide.canMerge(a.right, b.right));
D.assert(BorderSide.canMerge(a.bottom, b.bottom));
D.assert(BorderSide.canMerge(a.left, b.left));
return(new Border(
top: BorderSide.merge(a.top, b.top),
right: BorderSide.merge(a.right, b.right),
bottom: BorderSide.merge(a.bottom, b.bottom),
left: BorderSide.merge(a.left, b.left)
));
}
public override ShapeBorder add(ShapeBorder other, bool reversed = false)
{
if (!(other is Border border))
{
return(null);
}
if (BorderSide.canMerge(this.top, border.top) &&
BorderSide.canMerge(this.right, border.right) &&
BorderSide.canMerge(this.bottom, border.bottom) &&
BorderSide.canMerge(this.left, border.left))
{
return(merge(this, border));
}
return(null);
}