protected virtual void OnRedone(UndoPoint e)
{
if (Redone != null) Redone(e);
}
private UndoPoint AddPoint(Element element, UndoAction action, string description, bool overwrite)
{
if (Suspended) return null;
UndoPoint undo = null;
string key = null;
string createDesc = null;
//Create undopoint
if (element is Shape || element is Line)
{
undo = new UndoPoint(element, action);
key = element.Key;
createDesc = element.GetType().Name;
}
else
{
return null;
}
//Remove any previous undos ahead of this one
if (mUndoPointer < List.Count)
{
for (int i = mUndoPointer+1; i < List.Count; i++)
{
List.RemoveAt(i);
}
}
//Set description
if (description == null || description == "")
{
if (action == UndoAction.Add)
{
undo.Description = "Add " + createDesc;
}
else if (action == UndoAction.Edit)
{
undo.Description = "Edit " + createDesc;
}
else if (action == UndoAction.Remove)
{
undo.Description = "Remove " + createDesc;
}
}
else
{
undo.Description = description;
}
//Get current undopoint
UndoPoint currentUndo = null;
if (mUndoPointer > -1) currentUndo = (UndoPoint) List[mUndoPointer];
//Check if must add or update the undopoint
if (overwrite && mUndoPointer > -1 && action == UndoAction.Edit && currentUndo.Key == key)
{
List[mUndoPointer] = undo;
}
else
{
//Add object to internal arraylist
List.Add(undo);
mUndoPointer = List.Count - 1;
}
return undo;
}
protected virtual void OnUndone(UndoPoint e)
{
if (Undone != null) Undone(e);
}