/// <summary>
/// Gets the executed command text from the sender object
/// </summary>
/// <param name="sender">Sender object</param>
/// <param name="e">Routed event arguments</param>
/// <returns>Executed command text (or empty string if something...)</returns>
private string GetCommandText(object sender, RoutedEventArgs e)
{
Window senderWindow = sender as Window;
if (sender == null)
{
return(""); //sender is not a window
}
if (senderWindow.Title != Title)
{
return(""); //sender window is not the calc window
}
ExecutedRoutedEventArgs executedArgs = e as ExecutedRoutedEventArgs;
if (e == null)
{
return("");
}
CalcCommand executedCommand = executedArgs.Command as CalcCommand;
if (executedCommand == null)
{
return("");
}
if (executedCommand.Operation == null)
{
return("");
}
return(executedCommand.Operation);
}
/// <summary>
/// Adds the operation to the ExpressionReader
/// </summary>
/// <param name="name">Operation name (according to the commands in the Window resources</param>
/// <param name="operation">Operation invokation expression</param>
private void AddOperation(string name, Func <IExpression> operation)
{
CalcCommand command = Resources[name] as CalcCommand;
ExpressionReader.AddOperation(command.Operation, operation, command.Priority);
}