[squeak-dev] The Inbox: ToolBuilder-Morphic-cbc.270.mcz

Marcel Taeumel marcel.taeumel at hpi.de
Mon Jan 11 16:45:38 UTC 2021

Hi Chris --

In "ToolBuilder-Morphic-mt.270", I tweaked a dialog's minimal size for smaller lists and added an expand button so that you can see more at once. I am aware that this is just a compromise to your proposed changes. Can you work with that? :-)

http://forum.world.st/The-Trunk-ToolBuilder-Morphic-mt-270-mcz-td5126091.html [http://forum.world.st/The-Trunk-ToolBuilder-Morphic-mt-270-mcz-td5126091.html]

And I just realized that you did not propose a "breathing space" but just estimated the dialogs decorations around the central pane.  My bad. Well, there is now extra space to breathe. We might remove that as well.


Am 11.01.2021 11:30:29 schrieb Marcel Taeumel <marcel.taeumel at hpi.de>:
Still, it makes me wonder if you ever you "list filtering" in such dialogs? You seem to want to optimize the users browsing experience, not the searching experience.

Am 11.01.2021 11:27:13 schrieb Marcel Taeumel <marcel.taeumel at hpi.de>:
Hi --

>From my experience with the codebase in Squeak 3 and 4, any magic buffers such as "20" and "40" should be avoided for the sake of HI-DPI and hard-to-debug UI glitches. Deriving such buffers from the current font metrics seems to be more robust. Note that, in general, I am not opposed to giving content "more space to breathe" :-)

Having to iterate over all items in a list is too costly for larger lists. The LazyListMorph attempt to only consider a sample proved to entail annoying UI glitches such as shaky UI elements while scrolling.

Here are some numbers:

font := TextStyle defaultFont.
items := SystemNavigation default allClasses collect: [:class | class name].

[items do: [:item | font widthOfString: item]] bench.
'718 per second. 1.39 milliseconds per run. 0 % GC time.'

[(20 * (font widthOf: $m))@(15 * font height)] bench.
'22,000,000 per second. 45.4 nanoseconds per run. 2.47901 % GC time.'

Having milliseconds for a simple thing such as #initialExtent is really an issue for snappy GUIs because, for example, there are only 25 milliseconds for a frame in 40 FPS.


All in all, you are oppsed to always make room for 15 items and (roughly) 20 characters per item. So, I suggest that we could make the 15 derived from the actual number of items ... plus 1-2 if you want to leave more whitespace. For the 20, I would suggest to only count the number of characters and multiply with that width-of-$m. For performance reasons:

[items inject: 0 into: [:max :item | max max: item size]] bench.
'30,200 per second. 33.1 microseconds per run. 0.05999 % GC time.'

Yes, we could watch out for the size of #currentWorld, as you suggested. But this already happens via RealEstateAgent class >> maximumUsableAreaInWorld: as well as sends of #translatedToBeWithin: to a world's bounds. No need to duplicate and scatter those constraints all over the code base. :-) ... That said ... I think there is a bug in DialogWindow >> #moveToPreferredPosition and also in its initial extent. DialogWindow does not talk to RealEstateAgent at all ...


P.S.: How can you know that "item" is something that works with #widthOfString:? :-) Could be an instance of Text, for example.
Am 08.01.2021 20:27:56 schrieb commits at source.squeak.org <commits at source.squeak.org>:
A new version of ToolBuilder-Morphic was added to project The Inbox:

==================== Summary ====================

Name: ToolBuilder-Morphic-cbc.270
Author: cbc
Time: 8 January 2021, 11:27:47.8204 am
UUID: abbbeb8a-9a8b-ef4a-b6a9-051b55cc2d5b
Ancestors: ToolBuilder-Morphic-mt.269

Set the initial extent of the ListChooser to not require resizing the dialog for reasonable sized lists (i.e., expand it so you can see all of the list).
At the small end, still object MT's suggested size; at the large end, will not take up more the 3/4ths of the world size.

=============== Diff against ToolBuilder-Morphic-mt.269 ===============

Item was changed:
----- Method: ListChooser>>initialExtent (in category 'building') -----
+ | listFont width height |
- | listFont |
listFont := Preferences standardListFont.
+ width := (items collect: [:item| listFont widthOfString: item]) max + 20 "Acutal size of items plus dialog buffer left/right"
+ max: (20 * (listFont widthOf: $m)). "but we want a not-too-small box as well"
+ height := ((items size max: 15) * listFont height) + 40. "for various other stuff in dialog above/below list"
+ "But, don't use the whole world."
+ width := width min: (self currentWorld extent x * 0.75) asInteger.
+ height := height min: (self currentWorld extent y * 0.75) asInteger.
+ ^ width at height!
- ^ (20 * (listFont widthOf: $m))@(15 * listFont height)!

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