[Octave-bug-tracker] [bug #56470] Open figures do not raise closing event when [X] is pressed

[Deyan]

URL:
  <https://savannah.gnu.org/bugs/?56470>

                 Summary: Open figures do not raise closing event when [X] is
pressed
                 Project: GNU Octave
            Submitted by: dvd_video
            Submitted on: Tue 11 Jun 2019 07:27:17 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Deyan
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Microsoft Windows

    _______________________________________________________

Details:

Hello,

Consider my Matlab University project for data processing control which is an
MP3 player with different plotters, FFT, `audioplayer` manipulation and
playlist located here:

https://github.com/dvdvideo1234/MP3Toolbox

In the code, I am using the following:

```matlab

function fig = getNextFigure()
  % Returns the top free figure handle to be opened
  if(isempty(get(0,'CurrentFigure')))
    fig = 1;
  else
    fig = max(get(0,'Children')) + 1;
  end
end

fig = getNextFigure(); % Maximum figure ID and increment it
  
while( <some_condition_here> )
  figure(fig)
  if(~ishandle(fig))
    break;
  else
    <what_the_loop_does>;
  end
end
```

In Octave, the opened figure hangs and it does not draw in real-time. The
figure only draws the first plot and then the window needs to be moved for it
to draw the next plot. The figure window cannot be closed. When closed, the
figure must trigger `~ishandle(fig)` and disappear afterward while braking the
loop. Instead, it cannot be closed and rather floods itself up. It can only be
stopped by flooding the command window with left clicks to change OS active
window and flood `^C`. The figure is refreshed every time an OS active window
is selected in the taskbar ( Tried with windows explorer. Click-flooding the
windows explorer in the taskbar gives slow and promising result, however, the
figure is destroyed after a couple of times. )

In Matlab, the figure opens normally and the subplots are updated accordingly.
The graph runs smoothly and it does not hang at all. The figure can be closed,
the loop is broken and the figure returns the control to the command window of
the MP3 player.



    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Tue 11 Jun 2019 07:27:17 AM UTC  Name: octave-1.JPG  Size: 173KiB   By:
dvd_video
Thy to hit the [X] to close the figure.
<http://savannah.gnu.org/bugs/download.php?file_id=47067>
-------------------------------------------------------
Date: Tue 11 Jun 2019 07:27:17 AM UTC  Name: octave-2.JPG  Size: 197KiB   By:
dvd_video
Thy to hit the [X] to close the figure.
<http://savannah.gnu.org/bugs/download.php?file_id=47068>
-------------------------------------------------------
Date: Tue 11 Jun 2019 07:27:17 AM UTC  Name: octave-3.jpg  Size: 257KiB   By:
dvd_video
Thy to hit the [X] to close the figure.
<http://savannah.gnu.org/bugs/download.php?file_id=47069>
-------------------------------------------------------
Date: Tue 11 Jun 2019 07:27:17 AM UTC  Name: octave-4.JPG  Size: 123KiB   By:
dvd_video
Thy to hit the [X] to close the figure.
<http://savannah.gnu.org/bugs/download.php?file_id=47070>

    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?56470>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/