rpanel (version 1.1-5.2)

rp.textentry: Text entry boxes for a panel

Description

This function adds one or more boxes which allow text to be entered.

Usage

rp.textentry(panel, variable, action = I, labels = NULL, names = labels, 
  title = NULL, initval = rep(NA, length(labels)), pos = NULL, 
  foreground = NULL, background = NULL, font = NULL, width = 20, keydown = FALSE, 
  parentname = deparse(substitute(panel)), name = paste("textentry", .nc(), sep=""), ...)

Value

If the argument panel is set to the panelname string, the same string is returned. If the panel object is used, the altered panel is assigned to both the calling level and panel's environment level.

Arguments

panel

the panel in which the text entry box(es) should appear. This may be passed as a panelname string or the panel object itself.

variable

the name of the variable which will be assigned the text entered into the box(es).

action

the function which is called when the text has been entered.

labels

a character string of labels for the text entry boxes.

names

a character string of the names of the elements of variable which can be referred to within action functions.

title

title above multiple textentries

initval

the initial value(s) for var (optional). The initial value(s) can also be specified in the call to rp.control.

pos

the layout instructions. Please see the rp.pos example and help for full details.

foreground

colour of the text

background

colour of the text background

font

font to be used

width

character width of the textboxes

keydown

if TRUE the action function will be called on every key press - this may not be wise

parentname

this specifies the widget inside which the text entry widget should appear. In the current version, it should not normally be used.

name

name assigned to the textentries; used for disposal etc

...

...

Warning

The action function should return the panel. Without this assignment any widgets added or alterations made to panel parameters within the action function will be lost.

Details

The function action should take one argument, which should be the panel to which the text entry box is attached.

See rp.grid for details of the grid layout system.

References

rpanel: Simple interactive controls for R functions using the tcltk package. Journal of Statistical Software, 17, issue 9.

See Also

rp.control

Examples

if (FALSE) {
   plotf <- function(panel) {
      with(panel, {
		 pars   <- as.numeric(pars)
         xgrid <- seq(0.1, max(c(pars[3], 5), na.rm = TRUE), length = 50)
         dgrid <- df(xgrid, pars[1], pars[2])
         plot(xgrid, dgrid, type = "l", col = "blue", lwd = 3)
         if (!is.na(pars[3])) {
            lines(rep(pars[3], 2), c(0, 0.95 * max(dgrid)), lty = 2, col = "red")
            text(pars[3], max(dgrid), as.character(pars[3]), col = "red")
            }
         })
      panel
      }

   panel <- rp.control(pars = c(5, 10, NA))
   rp.textentry(panel, pars, plotf, labels = c("df1", "df2", "observed"),
          initval = c(10, 5, 3))
   rp.do(panel, plotf)
}