private void WlkFirstWalk(Elem v)
{
if (v.NumChildren() == 0)
{
v.prelim = 0;
Elem left = WlkGetLeftSibling(v);
if (left != null)
v.prelim = left.prelim + MarginHorizontal() + left.Dimensions.Width;
}
else
{
Elem leftmostChild = WlkLeftmostChild(v);
Elem rightmostChild = WlkRightmostChild(v);
Elem defaultAncestor = leftmostChild;
foreach (Elem w1 in v.Children())
{
WlkFirstWalk(w1);
WlkApportion(w1, defaultAncestor);
}
WlkExecuteShifts(v);
int midpoint = (leftmostChild.prelim + leftmostChild.Dimensions.Width / 2 +
rightmostChild.prelim + rightmostChild.Dimensions.Width / 2)
- v.Dimensions.Width;
midpoint /= 2;
Elem w = WlkGetLeftSibling(v);
if (w != null)
{
v.prelim = w.prelim + MarginHorizontal() + w.Dimensions.Width;
v.mod = v.prelim - midpoint;
}
else
v.prelim = midpoint;
}
}
private Elem WlkNextRight(Elem v)
{
if (v.NumChildren() > 0)
return WlkRightmostChild(v);
else
return v.thread;
}
private void WlkExecuteShifts(Elem v)
{
int shift = 0;
int change = 0;
List<Elem> reverse = new List<Elem>(v.NumChildren());
foreach (Elem e in v.Children()) /*and this monstrosity. ug!*/
reverse.Add(e);
reverse.Reverse();
foreach (Elem w in reverse)
{
w.prelim = w.prelim + shift;
w.mod = w.mod + shift;
change = change + w.change;
shift = shift + w.shift + change;
}
}
