public void AddAction(HistoryElement newAction) // добавить действие в историю
{
lock (this)
{
if (m_historyCurrent == m_capacity - 1)
{
// увеличение емкости истории при переполнении
m_capacity += m_capacity;
HistoryElement[] increaseHistory = new HistoryElement[m_capacity];
Array.Copy(m_actionsArray, increaseHistory, m_actionsArray.Length);
m_actionsArray = increaseHistory;
}
m_actionsArray[m_historyCurrent + 1] = newAction;
m_historyCurrent++;
m_historyLength = m_historyCurrent + 1;
// зажигание события возможности отмены
HistoryAllowedEventArgs undoEvargs = new HistoryAllowedEventArgs(true);
OnUndoAllowed(undoEvargs);
// зажигание события отсутсвия повтора
HistoryAllowedEventArgs redoEvargs = new HistoryAllowedEventArgs(false);
OnRedoAllowed(redoEvargs);
}
}
public HistoryElement Redo() // повтор действия из истории
{
if (!isRedo())
{
return(null);
}
m_historyCurrent++;
HistoryAllowedEventArgs historyEvargs = null;
// зажигание события возможности повтора
if (isRedo())
{
historyEvargs = new HistoryAllowedEventArgs(true);
OnRedoAllowed(historyEvargs);
}
else
{
historyEvargs = new HistoryAllowedEventArgs(false);
OnRedoAllowed(historyEvargs);
}
// зажигание события возможности отмены
historyEvargs = new HistoryAllowedEventArgs(true);
OnUndoAllowed(historyEvargs);
return(m_actionsArray[m_historyCurrent]);
}
public HistoryElement Undo() // откат действия
{
if (!isUndo())
{
return(null);
}
m_historyCurrent--;
HistoryAllowedEventArgs historyEvargs = null;
// зажигание события возможности отмены
if (isUndo())
{
historyEvargs = new HistoryAllowedEventArgs(true);
OnUndoAllowed(historyEvargs);
}
else
{
historyEvargs = new HistoryAllowedEventArgs(false);
OnUndoAllowed(historyEvargs);
}
// зажигание события возможности повтора
historyEvargs = new HistoryAllowedEventArgs(true);
OnRedoAllowed(historyEvargs);
return(m_actionsArray[m_historyCurrent + 1]);
}
protected virtual void OnRedoAllowed(HistoryAllowedEventArgs args)
{
if (RedoAllowed != null)
{
RedoAllowed(this, args);
}
}
public void Clear() // очистка истории (например сохранили все)
{
m_historyCurrent = -1;
m_historyLength = 0;
HistoryAllowedEventArgs historyEvargs = new HistoryAllowedEventArgs(false);
OnUndoAllowed(historyEvargs);
OnRedoAllowed(historyEvargs);
}
