void SplitterFrame::FrameLayout(Rect& r) {
..
..
..
    size = minmax(size, minsize, maxsize);
}

void SplitterFrame::FrameLayout(Rect& r)
{
	Rect rr = r;
	maxsize = max(0, (type == LEFT || type == RIGHT?r.GetWidth():r.GetHeight()) - sizemin);
	size = minmax(size, minsize, maxsize);
	switch(type) {
	case LEFT:
		r.left += size;
		rr.right = r.left;
		break;
	case RIGHT:
		r.right -= size;
		rr.left = r.right;
		break;
	case TOP:
		r.top += size;
		rr.bottom = r.top;
		break;
	case BOTTOM:
		r.bottom -= size;
		rr.top = r.bottom;
		break;
	}	
	SetFrameRect(rr);
}