rp.menu: Top level menu for a panel

In rpanel: Simple Interactive Controls for R using the 'tcltk' Package

Top level menu for a panel

Description

This function adds a menu to the top of the panel window. When a menu item is selected, a variable is set and an action function is called.

Usage

rp.menu(panel, variable, labels, initval=NULL, action=I,
        foreground=NULL, background=NULL, font=NULL,
        name=paste("menu", .nc(), sep="")) 

Arguments

panel	the panel to which the menu should be attached should appear.
variable	the name of the variable whose value is set by the menu. (Renamed in 2.0 to variable from var as var is a reserved word.)
labels	the labels for the menu options. These values are returned through var. The menu is defined by a list of lists of character strings. Each major menu heading should be the first item in the sub-lists with the submenu items listed afterwards in the same list. Please see the example.
initval	the initial value of variable (optional). The initial value can also be specified in the call to rp.control.
action	the function which is called when a menu item is chosen.
foreground	this sets the colour of text e.g. "navy"
background	this sets the background colour of text e.g. "white"
font	this sets the text font e.g. "Arial"
name	the name of the widget - this is used by rp.widget.dispose

Details

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

The list for a menu consisting of "File" and "Edit" only would be defined as list(list("File"), list("Edit")).

The list for a menu consisting of "File" with subitem "Quit", and "Edit" with subitems "Copy", "Cut" and "Paste", would be defined as list(list("File", "Quit"), list("Edit", "Copy", "Cut", "Paste")).

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.

The action function must be defined before the rp.menu statement as it relies on the function already existing.

Note

The former argument parent has been discontinued in version 1.1.

References

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

See Also

rp.checkbox,rp.control

Examples

## Not run: 
   a <- rp.control()
   # The action function has to come first so that it already exists for rp.menu, 
   # as it creates the callback functions on the fly it requires action to already 
   # be defined.
   domenu <- function(panel) {
      rp.messagebox(panel$menuchoice, title = "You chose")
      panel
      }
   rp.menu(a, menuchoice, labels=list(list("File","Quit"),
              list("Edit","Copy","Cut","Paste")), action=domenu)

## End(Not run)

rpanel documentation built on Feb. 16, 2023, 10:37 p.m.