Re: [racket-users] Trying to specify resize-border for instance of dialog

[Stefan Schwarzer]

On 2021-06-26 01:56, Don Green wrote:
> When I specify as follows:
> 
> (define dialog2 (new dialog%
>  (label "Get-Prototype-dialog") 
>  (style resize-border)
>  ))
> 
> Returned error:
> resize-border: unbound identifier in: resize-border

I guess you want 'resize-border (as a symbol). :-)

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[racket-users] How do I create a scrollable popup window?

[Don Green]

How do I create a scrollable popup window?
I can create a dialog that is a popup but it is not scrollable.
The dialog class does not appear to have a scroll option.

Is this where I use a 'panel' class instead of the 'dialog' class?


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Re: [racket-users] Trying to specify resize-border for instance of dialog

[Sorawee Porncharoenwase]

It should be 'resize-border. Notice the single quote character in front of
“resize-border”.

FWIW, if you want to ask multiple short questions, you could also use the
Racket Slack channel.

The sign up link: https://racket-slack.herokuapp.com/
The channel: https://racket.slack.com/

On Fri, Jun 25, 2021 at 4:56 PM Don Green 
wrote:

> When I specify as follows:
>
> (define dialog2 (new dialog%
>  (label "Get-Prototype-dialog")
>  (style resize-border)
>  ))
>
> Returned error:
> resize-border: unbound identifier in: resize-border
>
> --
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> 
> .
>

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[racket-users] Is it possible to specify a hierarchy of menu-item options in racket/gui more than 2 deep?

[Don Green]

Is it possible to specify a hierarchy of menu-item options in racket/gui 
more than 2 deep?

In other words, I am able to define menu-item options such that I do get a 
menu-bar with options that present sub options and I can call functions 
using 'callback' from those suboptions, but I have thus far not been 
successful at creating a deeper hierarchy of subsuboptions.

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[racket-users] Trying to specify resize-border for instance of dialog

[Don Green]

When I specify as follows:

(define dialog2 (new dialog%
 (label "Get-Prototype-dialog") 
 (style resize-border)
 ))

Returned error:
resize-border: unbound identifier in: resize-border

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[racket-users] ..

[Don Green]

..

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Re: [racket-users] Tilde expansion requirement breaks XDG compliance

[Matthew Flatt]

Thanks! I've pushed a change based on your explanation. I was able to
confirm that it made the `XDG_CONFIG_HOME` environment take effect when
it previously did not, at least.

At Fri, 25 Jun 2021 15:44:53 -0700 (PDT), pastel raschke wrote:
> Racket seems to insist on using ~/.racket as its special place, despite the 
> apparent fix that added XDG compliance. This happens even when I have 
> racket folders neatly set up in all my xdg dirs, and clear ~/.racket* every 
> time.
> 
> Stepping through in a debugger, I found the problem was at line 2038 of 
> rktio_fs.c, where rktio_system_path calls rktio_expand_user_tilde on 
> prefer_home_str. When prefer_home_str is set from an appropriate XDG 
> environment variable, it is specifically checked to be an absolute path by 
> starting with a slash, where the default prefer_home_str starts with a 
> tilde.
> 
> This wouldn't be a problem if rktio_expand_user_tilde did not respond to an 
> absolute path by setting RKTIO_ERROR_NO_TILDE and returning null, or if the 
> error were caught in rktio_system_path and prefer_home were set properly, 
> or if prefer_home_str were not tilde expanded after being set to an 
> absolute path at line 2008 in the first place. The current behavior results 
> in the non-compliant ~/.racket being used, to my great frustration.
> 
> Thank you for your work.
> 
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> e6bn%40googlegroups.com.

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[racket-users] Tilde expansion requirement breaks XDG compliance

[pastel raschke]

Racket seems to insist on using ~/.racket as its special place, despite the 
apparent fix that added XDG compliance. This happens even when I have 
racket folders neatly set up in all my xdg dirs, and clear ~/.racket* every 
time.

Stepping through in a debugger, I found the problem was at line 2038 of 
rktio_fs.c, where rktio_system_path calls rktio_expand_user_tilde on 
prefer_home_str. When prefer_home_str is set from an appropriate XDG 
environment variable, it is specifically checked to be an absolute path by 
starting with a slash, where the default prefer_home_str starts with a 
tilde.

This wouldn't be a problem if rktio_expand_user_tilde did not respond to an 
absolute path by setting RKTIO_ERROR_NO_TILDE and returning null, or if the 
error were caught in rktio_system_path and prefer_home were set properly, 
or if prefer_home_str were not tilde expanded after being set to an 
absolute path at line 2008 in the first place. The current behavior results 
in the non-compliant ~/.racket being used, to my great frustration.

Thank you for your work.

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[racket-users] Top-level unbound identifiers during expansion

[Greg Rosenblatt]

I've encountered an identifier binding order issue that only manifests in 
the REPL.  My current workaround is to use forward definitions followed by 
set!s.  I've heard rumors that the top-level is hopeless, but I'd like to 
try and make this work without unnecessary workarounds, if possible.


To demonstrate the issue, I've defined a syntax transformer that binds 
temporary names to procedures, and defines wrapper syntax transformers for 
referencing these procedures.

This syntax works fine within a module, or other non-top-level definition 
context.  But when used at the top-level, I get an unbound identifier error 
as the first procedure body is being expanded.  The first procedure 
references the second via the wrapper.


;; issue.rkt
#lang racket/base
(provide issue-syntax)
(require (for-syntax racket/base))

(define-syntax (issue-syntax stx)
  (syntax-case stx ()
((_ ((name param ...) body ...) ...)
 (with-syntax (((name.r ...) (generate-temporaries #'(name ...
   #'(begin (define-syntax (name stx)
  (syntax-case stx ()
((_ . args) #'(name.r . args))
(_  #'name.r))) ...
(define name.r (lambda (param ...) body ...)) ...)
;; eof


> racket
Welcome to Racket v8.0 [cs].
> (require "issue.rkt")
> (let ()
(issue-syntax
  ((foo x) (bar x 1 2))  ; note the reference to bar
  ((bar a b c) `(bar: ,a ,b ,c)))
(foo 'is-the-top-level-hopeless?))
(bar: is-the-top-level-hopeless? 1 2)
> (issue-syntax
((foo x) (bar x 1 2))  ; note the reference to bar
((bar a b c) `(bar: ,a ,b ,c)))
; bar4: unbound identifier;
;  also, no #%top syntax transformer is bound
;   in: bar4
; [,bt for context]
> ,bt
; bar4: unbound identifier;
;  also, no #%top syntax transformer is bound
;   in: bar4
;   context...:
;/Applications/Racket v8.0/share/pkgs/xrepl-lib/xrepl/xrepl.rkt:1493:0
;/Applications/Racket v8.0/collects/racket/repl.rkt:11:26


I can work around this issue by altering issue-syntax to forward-define 
names before using set! to initialize them:

(define-syntax (issue-syntax stx)
  (syntax-case stx ()
((_ ((name param ...) body ...) ...)
 (with-syntax (((name.r ...) (generate-temporaries #'(name ...
   #'(begin (define-syntax (name stx)
  (syntax-case stx ()
((_ . args) #'(name.r . args))
(_  #'name.r))) ...
(define name.r #f) ...  ; forward definitions
(set! name.r (lambda (param ...) body ...)) ...)


Is there a better alternative?

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Re: [racket-users] Is it possible to effectively display a window with a bitmap background?

[Jens Axel Søgaard]

Use canvas%

fre. 25. jun. 2021 kl. 18.10 skrev Don Green :

> Is it possible to effectively display a window with a bitmap background?
> In racket/gui, I can see how to apply a bitmap to a button.
> If the only way to display a bitmap is in a button, is it practical to
> size the button to the entire frame or pane in the frame?
>
>
> --
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> 
> .
>
-- 
-- 
Jens Axel Søgaard

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[racket-users] Is it possible to effectively display a window with a bitmap background?

[Don Green]

Is it possible to effectively display a window with a bitmap background?
In racket/gui, I can see how to apply a bitmap to a button.
If the only way to display a bitmap is in a button, is it practical to size 
the button to the entire frame or pane in the frame?


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Re: [racket-users] Can I break my racket/gui program be broken down into multiple modules?

[Laurent]

I'm not entirely sure what you mean but, just in case, you can indeed
export created GUI widgets:
file gui1.rkt :
```
#lang racket/gui

(provide fr msg)

(define fr (new frame% [label "Hear me out"]))
(define msg (new message% [parent fr] [label "I have an important
message"]))

```
file gui2.rkt :
```
#lang racket/gui
(require "gui1.rkt")

(send fr show #t)
```


On Thu, Jun 24, 2021 at 10:41 PM Don Green 
wrote:

> Can I break my racket/gui program be broken down into multiple modules?
> I am able to require modules through the callback function but not the GUI
> definitions themselves.
>
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> 
> .
>

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