CHOICEBUTTON(9) CHOICEBUTTON(9)
NAME
choicebutton - create and manipulate choicebutton widgets
SYNOPSIS
choicebutton pathName ?options?
STANDARD OPTIONS
-activebackground -borderwidth -relief
-activeforeground -font -text
-anchor -foreground
-background -image
-bitmap -justify
WIDGET-SPECIFIC OPTIONS
-command command
Specifies a Tk command to associate with the button.
This command is typically invoked when mouse button 1
is released over the button window. The button's glo-
bal variable (-variable option) will be updated before
the command is invoked.
-height dist
Specifies a desired height for the button. If this
option isn't specified, the button's desired height is
computed from the size of the highest item in the
-values list.
-selectcolor colour
Specifies a background colour to use when the button is
selected. If specified as an empty string, no special
colour is used for displaying when the widget is
selected.
-values list
Specifies a list of all the values the choicebutton can
choose from.
-variable string
Specifies name of global variable to set whenever this
button is selected. The variable will be set to the
index of the currently selected item. Changes in this
variable also cause the button to choose the appropri-
ate item (provided it is an integer and within range).
-width dist
Specifies a desired width for the button. If this
option isn't specified, the button's desired width is
computed from the size of the widest item in the
-values list.
Page 1 Plan 9 (printed 4/20/24)
CHOICEBUTTON(9) CHOICEBUTTON(9)
DESCRIPTION
The choicebutton command creates a new window (given by the
pathName argument) and makes it into a choicebutton widget.
Additional options, described above, may be specified on the
command line to configure aspects of the choicebutton such
as its colours, font, text, and initial relief. The choice-
button command returns its pathName argument. At the time
this command is invoked, there must not exist a window named
pathName.
A choicebutton is a widget that displays a textual string,
one of the items given in the list argument to the -values
option. When clicked on, the choicebutton displays a menu
showing all the available choices, allowing the user to
change the choice by selecting an item. In the description
below, an index is a zero-based index into the set of values
specified with the -values option.
WIDGET COMMAND
The choicebutton command creates a new Tk command whose name
is pathName. This command may be used to invoke various
operations on the widget. It has the following general
form:
pathName option ?arg arg ...?
Option and the args determine the exact behaviour of the
command. The following commands are possible for choicebut-
ton widgets:
pathName cget option
Returns the current value of the configuration option
given by option. Option may have any of the values
accepted by the choicebutton command.
pathName configure ?option? ?value option value ...?
Query or modify the configuration options of the wid-
get. If no option is specified, returns a list of all
of the available options for pathName. If one or more
option-value pairs are specified, the command modifies
the given widget option(s) to have the given value(s);
in this case the command returns an empty string.
Option may have any of the values accepted by the
choicebutton command.
pathName get ?value?
Get the index of the first item with value. If value is
not given, get the index of the currently selected
item.
pathName set index
Sets the current item to the indexth value.
pathName getvalue ?index?
Page 2 Plan 9 (printed 4/20/24)
CHOICEBUTTON(9) CHOICEBUTTON(9)
Get the value of the indexth item. If index is not
given, get the value of the currently selected item.
pathName setvalue value
Set the current item to the first item having value. If
no item has that value, no change is made, and an error
is returned.
pathName invoke index
Does just what would have happened if the user invoked
the choicebutton with the mouse and selected the item
at index: sets the current item to index and runs its
associated Tk command, if there is one. The return
value is that from invoking the Tk command, or an empty
string if there is no associated command.
pathName valuecount
Returns the number of values configured in the choice-
button.
SEE ALSO
button(9), checkbutton(9), options(9), radiobutton(9),
types(9)
Page 3 Plan 9 (printed 4/20/24)