[R] How to mimic select.list using RGtk2/gWidgetsRGtk2?

[John Verzani]

ronggui <ronggui.huang <at> gmail.com> writes:

> 
> I want to write a function mimic the function of select.list(), here
> is my preliminary version.
> 
> select <- function(x,multiple=TRUE,...){
> ans<-new.env()
> g <- gwindow(title=title,wid=200,heigh=500)
> x1<-ggroup(FALSE,con=g)
> x2<-gtable(x,multiple=multiple,con=x1,expand=TRUE)
> gbutton("OK",con=x1,handler=function(h,...){
> value <- svalue(x2)
> if (length(value)==0) value=""
> assign("selected",value,env=h$action$env)
> dispose(x1)
> },action=list(env=ans))
> ans
> }
> 

Hi,

You can call foo in the handler above or for gWidgetsRGtk2 use gbasicdialog
which will create a modal dialog:

options(guiToolkit="RGtk2")
library(gWidgets)

select <- function(x,multiple=TRUE,...){
  ans<-new.env()

  x1<-ggroup(horizontal=FALSE) # no parent container here
  x2<-gtable(x,multiple=multiple,con=x1,expand=TRUE)
  ret <- gbasicdialog(title="select a widget", widget=x1,handler=function(h,...){
    value <- svalue(x2)
    if (length(value)==0) value=""
    assign("selected",value,env=h$action$env)
    dispose(x1)
  },action=list(env=ans))
  ans
}

ans <- select(c("a","b"))
print(ans$selected)

Hope that helps.

> However, it doesn't behave as what I want.  What I want is that: for
> {select(c("a","b")); foo()}, foo() only runs after I have clicked the
> OK button of select(). Any hints?
> 
> Thanks.