public bool DeleteBookmark(HistoryEvent historyEvent)
{
HistoryNode historyNode = historyEvent.Node;
if (!_nodes.Contains(historyNode))
{
throw new Exception("Attempted to delete a bookmark history event that doesn't belong to this history!");
}
if (historyNode == _rootNode)
{
throw new Exception("Can't delete root node!");
}
if (historyNode == _currentNode)
{
return(false);
}
foreach (HistoryNode child in historyNode.Children)
{
child.Parent = historyNode.Parent;
historyNode.Parent.Children.Add(child);
}
historyNode.Children.Clear();
historyNode.Parent.Children.Remove(historyNode);
historyNode.Parent = null;
Notify(historyEvent, HistoryChangedAction.DeleteBookmark);
return(true);
}
protected HistoryNode(int id, UInt64 ticks, CoreAction action, Bookmark bookmark, HistoryNode parent, DateTime createDate)
{
Id = id;
Ticks = ticks;
Parent = parent;
CreateDate = createDate;
Children = new List <HistoryNode>();
}
public History()
{
_nodes = new HashSet <HistoryNode>();
_nextId = 0;
_rootNode = new RootHistoryNode();
_nodes.Add(_rootNode);
_currentNode = _rootNode;
}
private void AddChildNode(HistoryNode historyNode, bool notify)
{
_currentNode.Children.Add(historyNode);
_nodes.Add(historyNode);
_currentNode = historyNode;
if (notify)
{
Notify(historyNode.HistoryEvent, HistoryChangedAction.Add);
}
}
public bool IsEqualToOrAncestorOf(HistoryNode ancestor)
{
while (ancestor != null)
{
if (ancestor == this)
{
return(true);
}
ancestor = ancestor.Parent;
}
return(false);
}
public bool DeleteBranch(HistoryEvent historyEvent)
{
HistoryNode historyNode = historyEvent.Node;
if (!_nodes.Contains(historyNode))
{
throw new Exception("Attempted to delete a branch that doesn't belong to this history!");
}
if (historyNode == _rootNode)
{
throw new Exception("Can't delete root node!");
}
if (historyNode.IsEqualToOrAncestorOf(_currentNode))
{
return(false);
}
HistoryNode parent = historyNode.Parent;
parent.Children.Remove(historyNode);
historyNode.Parent = null;
// Remove this node, and all its children
List <HistoryNode> nodesToRemove = new List <HistoryNode>();
nodesToRemove.Add(historyNode);
while (nodesToRemove.Count > 0)
{
HistoryNode childHistoryNode = nodesToRemove[0];
_nodes.Remove(childHistoryNode);
nodesToRemove.AddRange(childHistoryNode.Children);
nodesToRemove.RemoveAt(0);
}
Notify(historyEvent, HistoryChangedAction.DeleteBranch);
return(true);
}
internal RootHistoryEvent(HistoryNode historyNode)
{
_node = historyNode as RootHistoryNode;
}
internal CoreActionHistoryNode(int id, UInt64 ticks, CoreAction action, HistoryNode parent, DateTime createDate) : base(id, ticks, action, null, parent, createDate)
{
CoreAction = action;
HistoryEvent = new CoreActionHistoryEvent(this);
}
internal BookmarkHistoryNode(int id, UInt64 ticks, Bookmark bookmark, HistoryNode parent, DateTime createDate) : base(id, ticks, null, bookmark, parent, createDate)
{
Bookmark = bookmark;
HistoryEvent = new BookmarkHistoryEvent(this);
}