public static void RemoveFromList(ref DLink pCurrentHead, DLink pNodeToRemove)
{
Debug.Assert(pNodeToRemove != null);
DLink pTmpNode = pNodeToRemove;
// If pNode is head of list
if (pCurrentHead == pNodeToRemove)
{
pCurrentHead = pCurrentHead.GetNext();
if (pCurrentHead != null)
{
// Set prev to null - it's the new list head
pCurrentHead.SetPrev(null);
}
}
else
{
if (pTmpNode.GetPrev() != null)
{
// Set the previous node's next to pNode's next
pTmpNode.GetPrev().SetNext(pNodeToRemove.GetNext());
}
if (pTmpNode.GetNext() != null)
{
// Set the next node's prev to pNodes prev
pTmpNode.GetNext().SetPrev(pTmpNode.GetPrev());
}
}
}
protected DLink BaseGetNodeFromReserve()
{
// If pReserve is empty, refill with growDelta
if (pReserve == null)
{
AddToReservedList(this.growDelta);
}
// Get and remove head of pReserve (as pNode)
Debug.Assert(pReserve != null);
DLink pNodeToActivate = pReserve;
// Set new head of Reserve
pReserve = pReserve.GetNext();
// If new head is not null, clear its previous link to newly activated node
if (pReserve != null)
{
pReserve.SetPrev(null);
}
// "Clean" values of pNode
pNodeToActivate.Clean();
return(pNodeToActivate);
}
//----------------------------------------------------------------------
// Static methods
//----------------------------------------------------------------------
public static void AddToFront(ref DLink pCurrentHead, DLink pNodeToAdd)
{
// Set current node as next of new node
pNodeToAdd.SetNext(pCurrentHead);
// Set new node as prev to current node
if (pCurrentHead != null)
{
pCurrentHead.SetPrev(pNodeToAdd);
}
// Set new node as head of list
pCurrentHead = pNodeToAdd;
}
public void Attach(InputObserver observer)
{
// protection
Debug.Assert(observer != null);
observer.pSubject = this;
// add to front
if (head == null)
{
head = observer;
observer.SetNext(null);
observer.SetPrev(null);
}
else
{
observer.SetNext(head);
observer.SetPrev(null);
head.SetPrev(observer);
head = observer;
}
}
