[Octave-bug-tracker] [bug #54935] waitbar demos are too fast with qt toolkit

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?54935>

                 Summary: waitbar demos are too fast with qt toolkit
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Thu 01 Nov 2018 11:54:53 AM PDT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

The waitbar demos were originally created with the FLTK toolkit in mind.  When
executed with FLTK they operate at a reasonable speed and one can see the
operations in progress.  However, when the toolkit is qt everything runs very
quickly and the demo is over before the user can comprehend anything.

What we should probably do is place pause() statements within the for loops to
slow things down to a reasonable speed.  However, should we check which
toolkit we are using first?  Or just slow everything down?

Below are some timings


octave:34> tic; demo ('waitbar', 1); toc
waitbar example 1:
 h = waitbar (0, '0.00%');
 for i = 0:0.01:1
   waitbar (i, h, sprintf ('%.2f%%', 100*i));
 endfor
 close (h);

Elapsed time is 0.270298 seconds.
octave:35> graphics_toolkit fltk
octave:36> tic; demo ('waitbar', 1); toc
waitbar example 1:
 h = waitbar (0, '0.00%');
 for i = 0:0.01:1
   waitbar (i, h, sprintf ('%.2f%%', 100*i));
 endfor
 close (h);

Elapsed time is 1.69618 seconds.







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