public void Redo(int n = 1)
{
if ((n < 1) || (n > NumRedoable))
{
throw new ArgumentOutOfRangeException("n");
}
bool undo_changed = false;
for (int i = 0; i < n; i++)
{
UndoAction item = m_redoable.Pop();
item.Redo();
// Initially planned on not putting it back on the undo stack, and instead expecting
// it to eventually be re-added by the client (through events, etc). However, since
// deciding that element events will *not* be forwarded up through the control, it
// might make sense to just re-add the undo action.
_pushOntoUndoStack(item);
undo_changed = true;
}
if (undo_changed)
{
OnUndoItemsChanged();
}
OnRedoItemsChanged();
}
private UndoAction _popFromUndoStack()
{
// Pop the item from the top of the stack.
UndoAction action = m_undoable.First.Value;
m_undoable.RemoveFirst();
return(action);
}
private void _pushOntoUndoStack(UndoAction action)
{
// Push the item onto the top of the stack.
m_undoable.AddFirst(action);
if (m_undoable.Count > MaxItems)
{
// Remove one item from the bottom of the stack.
m_undoable.RemoveLast();
}
}
public void Undo(int n = 1)
{
if ((n < 1) || (n > NumUndoable))
{
throw new ArgumentOutOfRangeException("n");
}
for (int i = 0; i < n; i++)
{
UndoAction item = _popFromUndoStack();
item.Undo();
m_redoable.Push(item);
}
OnUndoItemsChanged();
OnRedoItemsChanged();
}
public void AddUndoAction(UndoAction action)
{
_pushOntoUndoStack(action);
OnUndoItemsChanged();
}
public void AddUndoAction(UndoAction action)
{
_pushOntoUndoStack(action);
OnUndoItemsChanged();
}
private void _pushOntoUndoStack(UndoAction action)
{
// Push the item onto the top of the stack.
m_undoable.AddFirst(action);
if (m_undoable.Count > MaxItems) {
// Remove one item from the bottom of the stack.
m_undoable.RemoveLast();
}
}