Yes, but that will block the UI.
The progress bar update (world rendering) is done by force using “self 
currentWorld displayWorld”, which also means that if the 
#do:displayingProgress: is forked there will be more than one UI rendering at 
the same time.

Open a window, evaluate the script below, drag and drop the window around.
[
Smalltalk allClasses
do:[:aClass| (Delay forMilliseconds: 1) wait]
displayingProgress:[:aClass| 'Processing ', aClass name].
] fork

Best regards,
Henrik

Fra: Pharo-dev [mailto:[email protected]] På vegne av 
[email protected]
Sendt: 05 February 2017 21:43
Til: Pharo Development List <[email protected]>
Emne: Re: [Pharo-dev] How can I create a trivial "spinner" etc, to see if image 
is busy?

In the base image

                        Smalltalk allClasses
                                    do:[:aClass| (Delay forMilliseconds: 1) 
wait]
                                    displayingProgress:[:aClass| 'Processing ', 
aClass name].

Phil

On Sun, Feb 5, 2017 at 7:16 PM, Henrik Nergaard 
<[email protected]<mailto:[email protected]>> wrote:
http://smalltalkhub.com/#!/~Latsabben/GafletFremgangFremviser

---------------------
| ston file|

ston := (1 to: 30) flatCollect: [:ix |STON toStringPretty: Smalltalk 
allClasses].
file := (FileStream fileNamed: 'file.ston').

ston whileDisplayingProgress
        action: [ :stream | file nextPutAll: stream ] whenDone: [ file close ];
        open;
        fillOwner
---------------------

Best regards,
Henrik

-----Opprinnelig melding-----
Fra: Pharo-dev 
[mailto:[email protected]<mailto:[email protected]>]
 På vegne av Yuriy Tymchuk
Sendt: 05 February 2017 16:56
Til: Pharo Development List 
<[email protected]<mailto:[email protected]>>
Emne: [Pharo-dev] How can I create a trivial "spinner" etc, to see if image is 
busy?

Hi all,

is there an easy was to do some thing that is constantly changing? so if my 
image freezes (to export a 1gb ston file for example) I can see when it’s done. 
   Or maybe there is a way to send a mac notification from Pharo?

Cheers.
Uko

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