Hi Luke, I'm doing something similar right now: For the class that will trigger the long computation: gtInspectorPreviewIn: composite <gtInspectorPresentationOrder: -10> ^ composite fastTable title: 'Matches'; display: [ self patterns ]; enableElementIndex; column: 'Index' evaluated: [ :val :i | i asString ] width: 40; column: 'Item' evaluated: [ :val | GTObjectPrinter asTruncatedTextFrom: val ast]; send: [:res | res findMatchesWith: matcher. res ]. And then in that findMatchesWith: method, the code that performs the long computation displays a progress bar like this: 'Searching in programs' displayProgressFrom: 1 to: programs size during: [:bar | 1 to: programs size do: [ :i | | prog | bar current: i. prog := programs at: i. result at: prog key put: (self findMatchesOf: aRCPatternMatch ast in: prog value)]]. HTH -- Johan Fabry, Senior Software Engineer. johan@raincode.com<mailto:johan@raincode.com> | Email too brief? Here's why! http://emailcharter.org<http://emailcharter.org/> From: Moose-dev [mailto:moose-dev-bounces@list.inf.unibe.ch] On Behalf Of Luke Gorrie Sent: Tuesday, March 27, 2018 1:48 PM To: Moose-related development &lt;moose-dev(a)list.inf.unibe.ch&gt; Subject: [Moose-dev] Re: Error dialog? Related question: Is there a simple way to show a progress meter while I am running actions in the inspector? Perhaps with a 'Cancel' button if the user becomes impatient? Some of my inspections can take a long time, either to read a file or to render a visualization, and it would be great to keep users in the loop a bit. On 26 March 2018 at 12:29, Luke Gorrie <luke@snabb.co<mailto:luke@snabb.co>> wrote: Hoi! Suppose that my GTInspector extension method fails for some interesting reason. How should I present an error message to the user? I'm am especially thinking of cases where I am spawning a Unix command behind the scenes and I want to show the (possibly long) output of the command to the user. Could happen either in an inspector extension method or also in a "Go" action of the inspector. Tips would be much appreciated :).

Yes, I'd say that UIManager is a good starting point to look for all kinds of dialogs. -- Johan Fabry, Senior Software Engineer. johan@raincode.com<mailto:johan@raincode.com> | Email too brief? Here's why! http://emailcharter.org<http://emailcharter.org/> From: Moose-dev [mailto:moose-dev-bounces@list.inf.unibe.ch] On Behalf Of Luke Gorrie Sent: Tuesday, March 27, 2018 2:52 PM To: Moose-related development &lt;moose-dev(a)list.inf.unibe.ch&gt; Subject: [Moose-dev] Re: Error dialog? Thanks for the tip, Johan! I have just stumbled upon the UIManager class. This looks like finally the right place to look for ways to show error dialogs, display a "waiting" cursor while work is being done, etc. Is that right or should I be looking somewhere else in the context of GTInspector extensions?

Thanks guys! Related question: I'd like to show progress messages from Unix commands by screen-scraping their output using PetitParser2. Especially Nix prints lots of progress messages that are all mixed in together due to parallel operation. I think that showing each one with UIManager>>inform: would be a nice match i.e. they will flash across the Pharo UI much like they flash across the Unix shell. Can I create a parser and feed it input one chunk at a time? Or do I need to somehow create a stream object for the parser and let it drive the control? On 27 March 2018 at 15:32, Tudor Girba &lt;tudor(a)tudorgirba.com&gt; wrote:

On 27 March 2018 at 15:07, Johan Fabry &lt;Johan(a)raincode.com&gt; wrote: I'm finding it a bit fiddly. For example, I would like to show an error message that includes the output of a Unix command (potentially quite long.) One option is: UIManager default abort: error messageText title: 'Error' but this does not provide scrolling and it tries to center all the lines. One other option is: UIManager default longMessage: error messageText title: 'Error' which is better in that it provides a scrollbar but worse in that the dialog window is initially very tiny and it shows the icon of "information" rather than "error." I'm looking for ways to tailor the dialogs to my needs but it is a bit of a maze of pluggability and indirection with UIManagers and UIThemes and so on. Help? :-) Is there an easy way to display a bespoke dialog e.g. a large scrollable window with an error icon?

My thoughts exactly! 😊 There is a description on how to do this i the spec book, here https://ci.inria.fr/pharo-contribution/view/Books/job/BuildingUIWithSpec/la… More about the book at http://books.pharo.org/spec-tutorial/ -- Johan Fabry, Senior Software Engineer. johan@raincode.com<mailto:johan@raincode.com> | Email too brief? Here's why! http://emailcharter.org<http://emailcharter.org/> From: Moose-dev [mailto:moose-dev-bounces@list.inf.unibe.ch] On Behalf Of Peter Uhnák Sent: Tuesday, March 27, 2018 6:38 PM To: Moose-related development &lt;moose-dev(a)list.inf.unibe.ch&gt; Subject: [Moose-dev] Re: Error dialog? Hi Luke, For example, I would like to show an error message that includes the output of a Unix command (potentially quite long.) I had similar issue and in the end I decided to just create a custom dialog using Spec. tm := TextModel new. tm title: 'Failed to do something useful'. tm enabled: false. tm text: 'A ' asText, ('lot' asText allItalic), ' of ' asText, ('text' asText allBold makeAllColor: Color red), ' can fit into this box.' asText. tm openDialogWithSpec [cid:image001.png@01D3C601.C3BD8200] Obviously this is literally the most basic way, I could e.g. compose multiple Spec Models etc. Peter