Problem with dealing with UI update on progress window

General
1

Hi Folks,

I have a progress window, that I create and show when I have a long running process in my apps.
I’ve tried to use threads and timers, and avoid doevents like mentionned on this forum…
but.
my progress window is never shown unless I call doevents when I send new progress bar value from the main long running method
the UserInterfaceUpdate of the thread is called the right number of times, I update the value of the progressbar there, but the progress window (and the bar) doesn’t get updated
what can it come from ?
the window is a movable modal type.

thanks.

2

Are you calling the thread’s sleep method to give other things a chance to run? Even 1ms will do.

3

doesn’t change anything.
the windows is updated at start, but nothing happens until the method finishes and the window is closed …

Capture d’écran 2023-03-09 à 12.11.08 - Moyenne

I tried to put a label at the bottom left of the window, with the value of the progress, and nothing is displayed !
although if I break with the debugger, the label.text gets updated in code…
seems the window is frozen ?

may be some hint: it kind of worked with 2019r11, but it does not works anymore with 2022r41…

4

There is an example in the Xojo examples which shows you how to update the progress. And yes, it’s a bit of a bother to do.

5

well after some(!) searches, it seems the progress bar does not get refreshed…
if I display the progress bar value as a text label , it is shown and updated correctly…
and the progress bar is not updated accordingly…
if I change the progressbar to a desktopprogressbar, and call Refresh(true) it is still not updated as it should…

6

small gif of the updating process …
the number bottom left ( correctly updated) is the value that is stored in the progress bar… which doesn’t move at all…
at 10 sec, a timer showing the remaining time appears correctly at the bottom right.

Enregistrement de l’écran 2023-03-09 à 12.57.17.2023-03-09 12_59_10.2023-03-09 13_00_15

1 Like
7

10 years ago, I followed this path for an Import Text to SQLite with lots of test / Replace(s)…

Then, I created my own Progress window with a nice green feeded rectangle.

So many work for a single use (it was the archive / actual data). But I was finalizing the project and do not realize this will never be seen by any user, only by me.

:innocent: or :japanese_ogre: depending on the point of view.

8

Make an example. You are doing something wrong.

9

What Xojo version? And OS. I vaguely recall something related to the progress component for some release. Maybe not your case, but…

10

2022r41

11

Ah, I’ve found it, not your case. I think it was an user mistake.

https://tracker.xojo.com/xojoinc/xojo/-/issues/71947

Try to make a sample and share with us.

12

well, it took already too much time for such a simple thing.
I replaced the progressbar with a canvas and now it works …

13

Did you try calling refresh on the progress bar after changing its value?

14

Did you use a large maximumvalue or just 100 ?

15

Also, make sure DesktopProgressBar.Indeterminate = False

And fire UserInterfaceUpdate events from your thread using AddUserInterfaceUpdate(name : value)

16

if windows ignore a permanet refresh because it is to often you can compare the time from last to current progress and update the ui as example each second.
what i used in vb6 if there is a for next i update only if (i mod 1000)=0 ← or something like that.

17

yes - no change. even with immediate refresh

18

I did not try that

19

what I did not understand is that all other items on the windows are refreshing ok, and only the progressbar doesnt

20

I used 200 as a maximum value. 100 was not smooth enough for very long methods.