[R] Is it possible to pass a Tcl/Tk component as argument to afunction

[John Fox]

Dear Hao,

> -----Original Message-----
> From: hao.liu at bms.com [mailto:hao.liu at bms.com] 
> Sent: Thursday, May 17, 2007 8:29 AM
> To: John Fox
> Cc: r-help at stat.math.ethz.ch
> Subject: Re: [R] Is it possible to pass a Tcl/Tk component as 
> argument to afunction
> 
> John:
> 
> Thanks for your reply, I spent some time on this and the 
> conclusion is it works:
> 
> top<- tktoplevel()
> mainFrame <- tkcanvas(top)
> 
> both top and mainFrame can be used as parameters to pass to 
> other function. The name, however, will conflict each other 
> if they are defined in the same environment, which means if 
> you have another top and mainFrame passed to another 
> function, the GUIs will get to the same container. To avaoid 
> this, better  use different name.
> 
> I wonder if there is a way for me to create an env and 
> eliminate an env dynamically, I will try to get some 
> information, but I definitely welcome some quick inputs...
> 

Yes, you can create and delete environments, though it's not clear to me why
you should have to do so:

> env <- new.env()
> env
<environment: 0x025f7380>
> parent.env(env)
<environment: R_GlobalEnv>
> rm(env)

Regards,
 John

> Thanks
> Hao
> 
> 
> John Fox wrote: 
> 
> 	Dear Hao,
> 	
> 	You might take a look at how the Rcmdr package is 
> implemented with many
> 	reusable elements. There is, for example, an 
> initializeDialog function.
> 	
> 	I hope this helps,
> 	 John
> 	
> 	--------------------------------
> 	John Fox, Professor
> 	Department of Sociology
> 	McMaster University
> 	Hamilton, Ontario
> 	Canada L8S 4M4
> 	905-525-9140x23604
> 	http://socserv.mcmaster.ca/jfox 
> 	-------------------------------- 
> 	
> 	  
> 
> 		-----Original Message-----
> 		From: r-help-bounces at stat.math.ethz.ch 
> 		[mailto:r-help-bounces at stat.math.ethz.ch] On 
> Behalf Of Hao Liu
> 		Sent: Wednesday, May 16, 2007 8:58 AM
> 		To: r-help at stat.math.ethz.ch
> 		Subject: [R] Is it possible to pass a Tcl/Tk 
> component as 
> 		argument to afunction
> 		
> 		hi! All:
> 		
> 		I wonder if someone has done this before...
> 		
> 		I am writing several functions that conduct statistical 
> 		analysis using a GUI interface by Tcl/Tk, they 
> share many 
> 		identical GUI components. What I am trying to 
> do now is to 
> 		simplify the code by writing a GUI repository 
> for all the 
> 		components they use, thus save effort for code 
> maintenance.
> 		
> 		Since they all use:
> 		
> 		mainFrame <- tkcanvas(top)
> 		
> 		--
> 		
> 		I wonder if I can write functions that take 
> mainFrame as an 
> 		argument, and call those functions from other 
> place with 
> 		initialized tkcanvas object. I did not see 
> example like this 
> 		and from my *limited* experience with tcltk, I found it 
> 		always need something to be initialized before 
> put to use, 
> 		that makes me wonder if this idea will work... 
> if it does 
> 		not, any work arounds? like using Macro?
> 		
> 		Thanks
> 		Hao
> 		
> 			[[alternative HTML version deleted]]
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