gslider {gWidgets} | R Documentation |
The gslider widget and gspinbutton widget allow the user to select a value from a sequence using the mouse. In the slider case, a slider is dragged left or right (or up or down) to change the value. For a spin button a text box with arrows beside allow the user to scroll through the values by clicking the arrows.
Some toolkits only allow integer values for these.
gslider(from = 0, to = 100, by = 1, value = from, horizontal = TRUE, handler = NULL, action = NULL, container = NULL, ..., toolkit = guiToolkit()) gspinbutton (from = 0, to = 10, by = 1, value = from, digits = 0, handler = NULL, action = NULL, container = NULL, ..., toolkit = guiToolkit())
from |
Starting point in range |
to |
Ending point in range |
by |
Step size between values in the sequence |
value |
The initial value |
digits |
The number of digits shown |
horizontal |
Specifies orientation of gslider widget |
handler |
Called on a change event. |
action |
Passed to handler |
container |
Optional container to attach widget to |
... |
Passed to add method of container |
toolkit |
Which GUI toolkit to use |
The svalue
method returns the selected value.
The svalue<-
method is used to set the selected value.
The addhandlerchanged
handler is called when the
widgets' value is changed.
## Not run: x <- rnorm(100) ## our handler plotHist <- function(...) hist(x, col=gray(svalue(sb)), breaks = svalue(sl)) w <- gwindow("Slider and spinbox example") tbl = glayout(cont=w) tbl[1,1] <- "Slide value to adjust shade" tbl[1,2] <- (sb <- gspinbutton(from=0,to=1,by=0.05,value=.5, container=tbl, handler=plotHist)) tbl[2,1] <- "No. breaks" tbl[2,2, expand=TRUE] <- (sl <- gslider(from = 1, to= 100, by=1, value = 10, cont = tbl, handler = plotHist)) ## End(Not run)