public void AddUndoItem(IUndoItem undoEvent)
{
if (Working)
{
return;
}
bool emptyBefore = (_batch?.Count ?? 0) == 0 && !_undoEvents.Any();
if (_batch != null)
{
_batch.Add(undoEvent);
}
else
{
ClearRedoHistory();
_undoEvents.Push(undoEvent);
if (_undoEvents.Count > MAX_UNDO_ITEMS)
{
// XXX: we throw away the current item? this should be a Dequeue so we can pop the front
_undoEvents.Pop();
}
}
if (emptyBefore)
{
// no longer empty
NonEmpty?.Invoke(this, EventArgs.Empty);
}
}
private IEnumerable <IUndoItem> PopUntil(FixedStack <IUndoItem> stack, IUndoItem sentinel)
{
while (stack.HasItems && stack.Peek() != sentinel)
{
yield return(stack.Pop());
}
}
public void ExternalTypeChanged(IUndoItem item)
{
if (recording && !paused && !undoing)
{
undoItems.Add(item);
}
}
public void Commit(int transactionID)
{
if (paused)
{
throw new Exception("Transaction handling is currently paused, can't commit!");
}
#if LOG_TRANSACTION_HANDLING
writer.WriteLine(new String(' ', transactionLevel) + "Commit to " + transactionID);
writer.Flush();
--transactionLevel;
#endif
#if CHECK_RINGLISTS
procEnv.graph.CheckTypeRinglistsBroken();
#endif
if (procEnv.Recorder != null)
{
procEnv.Recorder.TransactionCommit(transactionID);
}
// removes rollback information only if the transaction is outermost
// otherwise we might need to undo it because a transaction enclosing this transaction failed
if (transactionID == 0)
{
if (wasVisitedFreeRecorded && undoItems.Count > 0)
{
if (wasGraphChanged)
{
undoing = true;
procEnv.SwitchToSubgraph(procEnv.Graph);
}
for (int i = undoItems.Count - 1; i >= 0; --i)
{
IUndoItem curItem = undoItems[i];
if (curItem is LGSPUndoVisitedFree)
{
procEnv.graph.UnreserveVisitedFlag(((LGSPUndoVisitedFree)curItem)._visitorID);
}
else if (curItem is LGSPUndoGraphChange)
{
curItem.DoUndo(procEnv);
}
}
if (wasGraphChanged)
{
procEnv.ReturnFromSubgraph();
undoing = false;
}
}
undoItems.Clear();
UnsubscribeEvents();
wasVisitedFreeRecorded = false;
wasGraphChanged = false;
}
}
/// <summary>
/// Rollback the last undone command.
/// </summary>
public void Redo()
{
if (CanRedo)
{
_working = true;
IUndoItem redo = _redoEvents.Pop();
redo.Do();
_undoEvents.Push(redo);
_working = false;
}
}
/// <summary>
/// Rollback the last command.
/// </summary>
public void Undo()
{
if (CanUndo)
{
_working = true;
IUndoItem undo = _undoEvents.Pop();
undo.Undo();
_redoEvents.Push(undo);
_working = false;
}
}
public static void Record( IUndoItem item )
{
Node node = new Node( item ) {Previous = currentNode};
if ( currentNode != null )
{
currentNode.Next = node;
}
currentNode = node;
if ( firstNode != null )
firstNode = node;
}
public override string ToString()
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < undoItems.Count; ++i)
{
IUndoItem item = undoItems[i];
sb.Append(item.ToString());
sb.Append(" @");
sb.Append(i.ToString());
sb.Append("\n");
}
return(sb.ToString());
}
public static void Record(IUndoItem item)
{
Node node = new Node(item)
{
Previous = currentNode
};
if (currentNode != null)
{
currentNode.Next = node;
}
currentNode = node;
if (firstNode != null)
{
firstNode = node;
}
}
public void AddUndoItem(IUndoItem undoEvent)
{
if (!_working)
{
if (_batch != null)
{
_batch.Add(undoEvent);
}
else
{
ClearRedoHistory();
_undoEvents.Push(undoEvent);
if (_undoEvents.Count > MAX_UNDO_ITEMS)
{
_undoEvents.Pop();
}
}
}
}
/// <summary>
/// Rollback the last command.
/// </summary>
public void Undo()
{
if (!CanUndo)
{
return;
}
Working = true;
IUndoItem undo = _undoEvents.Pop();
bool nowEmpty = !_undoEvents.Any();
undo.Undo();
_redoEvents.Push(undo);
Working = false;
if (nowEmpty)
{
Empty?.Invoke(this, EventArgs.Empty);
}
}
/// <summary>
/// Rollback the last undone command.
/// </summary>
public void Redo()
{
if (!CanRedo)
{
return;
}
Working = true;
IUndoItem redo = _redoEvents.Pop();
redo.Do();
bool emptyBefore = !_undoEvents.Any();
_undoEvents.Push(redo);
Working = false;
if (emptyBefore)
{
NonEmpty?.Invoke(this, EventArgs.Empty);
}
}
public Node( IUndoItem item )
{
this.UndoItem = item;
}
public void ExternalTypeChanged(IUndoItem item)
{
if(recording && !paused && !undoing)
{
undoItems.Add(item);
}
}
public void Save(IUndoItem item)
{
undo.Push(item);
redo.Clear();
}
public Node(IUndoItem item)
{
this.UndoItem = item;
}
public void Rollback(int transactionID)
{
if (paused)
{
throw new Exception("Transaction handling is currently paused, can't roll back!");
}
#if LOG_TRANSACTION_HANDLING
writer.WriteLine(new String(' ', transactionLevel) + "Rollback to " + transactionID);
writer.Flush();
#endif
if (procEnv.Recorder != null)
{
procEnv.Recorder.TransactionRollback(transactionID, true);
}
undoing = true;
if (wasGraphChanged)
{
procEnv.SwitchToSubgraph(procEnv.Graph);
}
while (undoItems.Count > transactionID)
{
IUndoItem lastItem = undoItems[undoItems.Count - 1];
#if LOG_TRANSACTION_HANDLING
writer.Write(new String(' ', transactionLevel) + "rolling back " + undoItems.Count + " - ");
if (lastItem is LGSPUndoTransactionStarted)
{
writer.WriteLine("TransactionStarted");
}
else if (lastItem is LGSPUndoElemAdded)
{
LGSPUndoElemAdded item = (LGSPUndoElemAdded)lastItem;
if (item._elem is INode)
{
INode node = (INode)item._elem;
writer.WriteLine("ElementAdded: " + ((LGSPNamedGraph)procEnv.graph).GetElementName(node) + ":" + node.Type.Name);
}
else if (item._elem is IEdge)
{
IEdge edge = (IEdge)item._elem;
writer.WriteLine("ElementAdded: " + ((LGSPNamedGraph)procEnv.graph).GetElementName(edge.Source) + " -" + ((LGSPNamedGraph)procEnv.graph).GetElementName(edge) + ":" + edge.Type.Name + " ->" + ((LGSPNamedGraph)procEnv.graph).GetElementName(edge.Target));
}
else
{
IObject obj = (IObject)item._elem;
writer.WriteLine("ElementAdded: hash" + obj.GetHashCode() + ":" + obj.Type.Name);
}
}
else if (lastItem is LGSPUndoElemRemoved)
{
LGSPUndoElemRemoved item = (LGSPUndoElemRemoved)lastItem;
if (item._elem is INode)
{
INode node = (INode)item._elem;
writer.WriteLine("RemovingElement: " + ((LGSPNamedGraph)procEnv.graph).GetElementName(node) + ":" + node.Type.Name);
}
else if (item._elem is IEdge)
{
IEdge edge = (IEdge)item._elem;
writer.WriteLine("RemovingElement: " + ((LGSPNamedGraph)procEnv.graph).GetElementName(edge.Source) + " -" + ((LGSPNamedGraph)procEnv.graph).GetElementName(edge) + ":" + edge.Type.Name + "-> " + ((LGSPNamedGraph)procEnv.graph).GetElementName(edge.Target));
}
else
{
IObject obj = (IObject)item._elem;
writer.WriteLine("RemovingElement: hash" + obj.GetHashCode() + ":" + obj.Type.Name);
}
}
else if (lastItem is LGSPUndoAttributeChanged)
{
LGSPUndoAttributeChanged item = (LGSPUndoAttributeChanged)lastItem;
if (item._elem is IGraphElement)
{
writer.WriteLine("ChangingElementAttribute: " + ((LGSPNamedGraph)procEnv.graph).GetElementName((IGraphElement)item._elem) + ":" + item._elem.Type.Name + "." + item._attrType.Name);
}
else
{
writer.WriteLine("ChangingElementAttribute: hash" + ((IObject)item._elem).GetHashCode() + ":" + item._elem.Type.Name + "." + item._attrType.Name);
}
}
else if (lastItem is LGSPUndoElemRetyped)
{
LGSPUndoElemRetyped item = (LGSPUndoElemRetyped)lastItem;
writer.WriteLine("RetypingElement: " + ((LGSPNamedGraph)procEnv.graph).GetElementName(item._newElem) + ":" + item._newElem.Type.Name + "<" + ((LGSPNamedGraph)procEnv.graph).GetElementName(item._oldElem) + ":" + item._oldElem.Type.Name + ">");
}
else if (lastItem is LGSPUndoElemRedirecting)
{
LGSPUndoElemRedirecting item = (LGSPUndoElemRedirecting)lastItem;
writer.WriteLine("RedirectingEdge: " + ((LGSPNamedGraph)procEnv.graph).GetElementName(item._edge) + " before undoing removal");
}
else if (lastItem is LGSPUndoVisitedAlloc)
{
LGSPUndoVisitedAlloc item = (LGSPUndoVisitedAlloc)lastItem;
writer.WriteLine("VisitedAlloc: " + item._visitorID);
}
else if (lastItem is LGSPUndoVisitedFree)
{
LGSPUndoVisitedFree item = (LGSPUndoVisitedFree)lastItem;
writer.WriteLine("VisitedFree: " + item._visitorID);
}
else if (lastItem is LGSPUndoSettingVisited)
{
LGSPUndoSettingVisited item = (LGSPUndoSettingVisited)lastItem;
writer.WriteLine("SettingVisited: " + ((LGSPNamedGraph)procEnv.graph).GetElementName(item._elem) + ".visited[" + item._visitorID + "]");
}
else if (lastItem is LGSPUndoGraphChange)
{
LGSPUndoGraphChange item = (LGSPUndoGraphChange)lastItem;
writer.WriteLine("GraphChange: to previous " + item._oldGraph.Name);
}
#endif
if (wasGraphChanged)
{
if (lastItem is LGSPUndoGraphChange)
{
if (undoItems.Count - 2 >= 0 && undoItems[undoItems.Count - 2] is LGSPUndoGraphChange)
{
undoItems.RemoveAt(undoItems.Count - 1);
continue; // skip graph change without effect to preceeding graph change
}
}
}
lastItem.DoUndo(procEnv);
undoItems.RemoveAt(undoItems.Count - 1);
}
if (wasGraphChanged)
{
procEnv.ReturnFromSubgraph();
}
undoing = false;
if (transactionID == 0)
{
UnsubscribeEvents();
wasVisitedFreeRecorded = false;
wasGraphChanged = false;
}
if (procEnv.Recorder != null)
{
procEnv.Recorder.TransactionRollback(transactionID, false);
}
#if LOG_TRANSACTION_HANDLING
--transactionLevel;
writer.Flush();
#endif
#if CHECK_RINGLISTS
procEnv.graph.CheckTypeRinglistsBroken();
#endif
}
public void AddUndoItem(IUndoItem undoEvent)
{
if (!_working)
{
if (_batch != null)
{
_batch.Add(undoEvent);
}
else
{
ClearRedoHistory();
_undoEvents.Push(undoEvent);
if (_undoEvents.Count > MAX_UNDO_ITEMS)
{
_undoEvents.Pop();
}
}
}
}