//////////////////////////////////////////////////////////////////////////
public bool SaveUndoState(string Name)
{
IsDirty = true;
string StrState = GetCurrentStateForUndo();
if (StrState == null)
{
return(false);
}
UndoPointer++;
while (UndoStates.Count > UndoPointer)
{
UndoStates.RemoveAt(UndoStates.Count - 1);
}
try
{
System.Text.UTF8Encoding enc = new System.Text.UTF8Encoding();
byte[] OrigBuf = enc.GetBytes(StrState);
byte[] CompBuf = WUtils.CompressBuffer(OrigBuf);
UndoState State;
if (CompBuf != null)
{
State = new UndoState(Name, CompBuf, true, OrigBuf.Length);
}
else
{
State = new UndoState(Name, OrigBuf, false, OrigBuf.Length);
}
UndoStates.Add(State);
if (UndoStates.Count > MaxUndoLevel)
{
UndoStates.RemoveAt(0);
UndoPointer--;
}
return(true);
}
catch
{
UndoPointer--;
return(false);
}
}
//////////////////////////////////////////////////////////////////////////
private string GetUndoState(int Pos)
{
if (Pos < 0 || Pos >= UndoStates.Count)
{
return(null);
}
UndoState State = UndoStates[Pos];
byte[] StrBuf;
if (State.IsCompressed)
{
StrBuf = WUtils.DecompressBuffer(State.State, State.OrigSize);
}
else
{
StrBuf = State.State;
}
System.Text.UTF8Encoding enc = new System.Text.UTF8Encoding();
return(enc.GetString(StrBuf));
}
