Re: Catching Figure close button - callbacks not running?

[Przemek Klosowski]

On 1/29/19 1:19 PM, Richardson, Anthony wrote:
> set(gct, 'DeleteFcn' @(h, e) disp('bye bye'))

It works, but the printout seems to be buffered somehow and only appears 
after the next command is entered at the CLI.

Specifically, I use commandline Octave 4.2.2 on Fedora Linux, and type

    gcf=figure(1)
    set(gcf, 'DeleteFcn', @(h, e) disp('bye bye'))

nothing happens when I close the window, and I need to hit Enter on the 
Octave prompt to see the "bye bye" string.

I thought that it's buffered because it doesn't have a newline, but

    set(gcf, 'DeleteFcn', @(h, e) printf('bye bye\n'))

behaves in the same way. It looks like it needs an explicit fflush():

    set(gcf, 'DeleteFcn', @(h, e) {printf('bye bye\n'); fflush(stdout)})

'more off' works too.

It surprised me because we're not in octave REPL loop after the callback 
runs, but I guess the callbacks are buffering because the interpreter 
does not know in advance when they would be done running.