gWidgets (version 0.0-27)

gslider: Constructors for widgets to select a value from a sequence.

Description

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.

Usage

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())

Arguments

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

Details

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.

Examples

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))