Nothing
w <- gwindow("radio buttons")
g <- ggroup(cont=w, horizontal=FALSE)
## vanilla
x <- state.name[1:4]
rb1 <- gradio(x, cont=g)
## with handler
rb2 <- gradio(x, cont=g, handler=function(h,...) print(svalue(rb2)))
## add handler
rb3 <- gradio(x, cont=g)
addHandlerChanged(rb3, handler=function(h,...) print("add handler"))
## tests
## svalue
expect_equal(svalue(rb1), x[1])
expect_equal(svalue(rb1, index=TRUE), 1)
## svalue <-
svalue(rb1) <- x[2]
expect_equal(svalue(rb1), x[2])
## by index
svalue(rb1, index=TRUE) <- 3
expect_equal(svalue(rb1), x[3])
expect_warning(svalue(rb1, index=TRUE) <- length(rb1) + 1)
## [
expect_equal(rb1[], x)
expect_equal(rb1[2], x[2])
## [<-
expect_warning(rb1[] <- x[1:3])
## length
expect_equal(length(rb1), length(x))
## invoke handler
expect_output(rb3$invoke_change_handler(), "add handler")
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