Re: scroll-bar-toolkit-scroll

[gerd.moellmann@t-online.de (Gerd Moellmann)]

Richard Stallman <rms@gnu.org> writes:

>     I've used x_send_scroll_bar_event to "translate" the invocation of the
>     scroll bar callback to an X event that is handled in XTread_socket
>     like other events.  This seemed to be the easiest way to orderly
>     produce a scroll bar input event in the kdb queue because I saw no way
>     to predict when the callback is called (asynchronously).
> 
> Why not just insert the desired event into the Emacs event queue?
> That can be done at any time, asynchronously.

I think it's easier the way it is, where there's only one place where
input events are stored to the queue.

For example, should the callback be invoked from XTread_socket, in the
course of an event that's dispatched from XTread_socket to the scroll
bar widget, XTread_socket's local variable numchars had to be
decremented if the callback itself pushed something on the queue.