[racket-dev] Windowing API

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Sat Oct 15 10:07:49 EDT 2011

I think you'll have to handle `on-size' at the `racket/gui' level:

 (define panel
   (new (class panel%
          (define/override (on-size w h)
            (tellv web-view setFrame:
                   #:type _NSRect (make-NSRect (make-NSPoint 0 0) 
                                               (make-NSSize w h))))
        [parent frame]))

 ;; instead of `frame-view':
 (define panel-view (send panel get-client-handle)) 
 (tellv panel-view addSubview: web-view)

At Fri, 14 Oct 2011 23:19:32 -0700, Eric Dobson wrote:
> I am trying to implement a WebKit panel in Racket, and am running in to some 
> trouble with the windowing API. I cannot get resizing to work. In OS X it 
> looks like it is supposed to be enabled by default so I assume racket is 
> changing it so that it can do its layout algorithm. The problem is that If I 
> want to hook into this It looks like I need to get access to the platform 
> specific racket windowing API. Currently I can get access to the Objective C 
> layer, but not to the hidden racket layer. Maybe this is not the way I should 
> approach this but I'm hoping someone can help.
> #lang racket 
> (require racket/gui/base ffi/unsafe/objc ffi/unsafe) 
> (require mred/private/wx/cocoa/types 
>          (prefix-in c: mred/private/wx/cocoa/window)) 
> (define webkit-lib (ffi-lib (format 
> "/System/Library/Frameworks/WebKit.framework/WebKit"))) 
> (import-class WebView) 
> (import-class NSURLRequest) 
> (import-class NSURL) 
> (define web-view (tell (tell WebView alloc) initWithFrame: #:type _NSRect 
> (make-NSRect (make-NSPoint 0 0) (make-NSSize 300 300)) frameName: #f 
> groupName: #f)) 
> (define frame (new frame% (label "test-frame") (width 300) (height 300))) 
> ;(define racket-web-view (new c:window% (parent frame) (cocoa web-view) 
> (no-show? #f))) 
> ;This problem is here the parent argument needs to be the platform specific 
> window and not the generic one
> (define frame-view (send frame get-client-handle)) 
> (tellv frame-view addSubview: web-view) 
> (define request (tell NSURLRequest requestWithURL: (tell NSURL URLWithString: 
> #:type _NSString "http://www.google.com"))) 
> (tellv (tell web-view mainFrame) loadRequest: request) 
> (send frame show #t) 
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