/// <summary>
/// Iterate over all commands and delete those no longer valid.
/// Call it whenever data set was modified externally without undo/redo tracking.
/// </summary>
public void Refresh()
{
// edit command relies on add and remove so we have to first iterate over these
for (int i = 0; i < _undoRedoStack.Count; i++)
{
IUndoRedoCommand cmd = _undoRedoStack[i];
if (cmd is AddCommand <IModel> || cmd is RemoveCommand <IModel> )
{
if (!cmd.CheckExecutionContext())
{
_undoRedoStack.RemoveAt(i--);
_pointer--;
}
}
}
for (int i = 0; i < _undoRedoStack.Count; i++)
{
IUndoRedoCommand cmd = _undoRedoStack[i];
if (cmd is EditCommand <IModel> )
{
if (!cmd.CheckExecutionContext())
{
_undoRedoStack.RemoveAt(i--);
_pointer--;
}
}
}
}
public void Undo()
{
IUndoRedoCommand cmd = _undoRedoStack[--_pointer];
if (cmd.CheckExecutionContext()) // if command is no longer valid dispose it
{
cmd.Undo();
}
else
{
_undoRedoStack.RemoveAt(_pointer);
}
_onUndoAction?.Invoke();
_onRedoAction?.Invoke();
}