Control Button Functionality - start_stop

Cogent Tools Demo and Tutorials: Version 4.0
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# 9.4. Control Button Functionality - `start_stop`

       /*--------------------------------------------------------------------
        * Function:    start_stop
        * Returns:     t or nil
        * Description: Used by control buttons to call the start_process()
        *              and stop_processes() functions.
        *------------------------------------------------------------------*/
       function start_stop(button, prog, process_name, args...)
       {
         local child;

         if (button.switched_on())
           start_process (button, prog, process_name, args);
         else
           stop_processes(prog, process_name);
       }

If a toggle button is pressed in, it becomes active (ie. the `switched_on` method returns true), and we want its associated process to start. The program calls the start_process function to start the process, passing along the necessary arguments.

If the user untoggles (releases) a toggle button, the `switched_on` method becomes `FALSE`, and we call the stop_processes to stop the process associated with the button.

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