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.so man.macros

.TH radiobutton n 4.4 Tk "Tk Built-In Commands"

.BS

'\" Note:  do not modify the .SH NAME line immediately below!

.SH NAME

radiobutton \- Create and manipulate radiobutton widgets

.SH SYNOPSIS

\fBradiobutton\fR \fIpathName \fR?\fIoptions\fR?

.SO

\-activebackground      \-cursor        \-highlightthickness    \-takefocus

\-activeforeground      \-disabledforeground    \-image \-text

\-anchor        \-font  \-justify       \-textvariable

\-background    \-foreground    \-padx  \-underline

\-bitmap        \-highlightbackground   \-pady  \-wraplength

\-borderwidth   \-highlightcolor        \-relief

.SE

.SH "WIDGET-SPECIFIC OPTIONS"

.OP \-command command Command

Specifies a Tcl command to associate with the button.  This command

is typically invoked when mouse button 1 is released over the button

window.  The button's global variable (\fB\-variable\fR option) will

be updated before the command is invoked.

.OP \-height height Height

Specifies a desired height for the button.

If an image or bitmap is being displayed in the button then the value is in

screen units (i.e. any of the forms acceptable to \fBTk_GetPixels\fR);

for text it is in lines of text.

If this option isn't specified, the button's desired height is computed

from the size of the image or bitmap or text being displayed in it.

.OP \-indicatoron indicatorOn IndicatorOn

Specifies whether or not the indicator should be drawn.  Must be a

proper boolean value.  If false, the \fBrelief\fR option is

ignored and the widget's relief is always sunken if the widget is

selected and raised otherwise.

.OP \-selectcolor selectColor Background

Specifies a background color to use when the button is selected.

If \fBindicatorOn\fR is true then the color applies to the indicator.

Under Windows, this color is used as the background for the indicator

regardless of the select state.

If \fBindicatorOn\fR is false, this color is used as the background

for the entire widget, in place of \fBbackground\fR or \fBactiveBackground\fR,

whenever the widget is selected.

If specified as an empty string then no special color is used for

displaying when the widget is selected.

.OP \-selectimage selectImage SelectImage

Specifies an image to display (in place of the \fBimage\fR option)

when the radiobutton is selected.

This option is ignored unless the \fBimage\fR option has been

specified.

.OP \-state state State

Specifies one of three states for the radiobutton:  \fBnormal\fR, \fBactive\fR,

or \fBdisabled\fR.  In normal state the radiobutton is displayed using the

\fBforeground\fR and \fBbackground\fR options.  The active state is

typically used when the pointer is over the radiobutton.  In active state

the radiobutton is displayed using the \fBactiveForeground\fR and

\fBactiveBackground\fR options.  Disabled state means that the radiobutton

should be insensitive:  the default bindings will refuse to activate

the widget and will ignore mouse button presses.

In this state the \fBdisabledForeground\fR and

\fBbackground\fR options determine how the radiobutton is displayed.

.OP \-value value Value

Specifies value to store in the button's associated variable whenever

this button is selected.

.OP \-variable variable Variable

Specifies name of global variable to set whenever this button is

selected.  Changes in this variable also cause the button to select

or deselect itself.

Defaults to the value \fBselectedButton\fR.

.OP \-width width Width

Specifies a desired width for the button.

If an image or bitmap is being displayed in the button, the value is in

screen units (i.e. any of the forms acceptable to \fBTk_GetPixels\fR);

for text it is in characters.

If this option isn't specified, the button's desired width is computed

from the size of the image or bitmap or text being displayed in it.

.BE

.SH DESCRIPTION

.PP

The \fBradiobutton\fR command creates a new window (given by the

\fIpathName\fR argument) and makes it into a radiobutton widget.

Additional

options, described above, may be specified on the command line

or in the option database

to configure aspects of the radiobutton such as its colors, font,

text, and initial relief.  The \fBradiobutton\fR command returns its

\fIpathName\fR argument.  At the time this command is invoked,

there must not exist a window named \fIpathName\fR, but

\fIpathName\fR's parent must exist.

.PP

.VS

A radiobutton is a widget that displays a textual string, bitmap or image

and a diamond or circle called an \fIindicator\fR.

.VE

If text is displayed, it must all be in a single font, but it

can occupy multiple lines on the screen (if it contains newlines

or if wrapping occurs because of the \fBwrapLength\fR option) and

one of the characters may optionally be underlined using the

\fBunderline\fR option.  A radiobutton has

all of the behavior of a simple button: it can display itself in either

of three different ways, according to the \fBstate\fR option;

it can be made to appear

raised, sunken, or flat; it can be made to flash; and it invokes

a Tcl command whenever mouse button 1 is clicked over the

check button.

.PP

In addition, radiobuttons can be \fIselected\fR.

If a radiobutton is selected, the indicator is normally

.VS

drawn with a selected appearance, and

a Tcl variable associated with the radiobutton is set to a particular

value (normally 1).

Under Unix, the indicator is drawn with a sunken relief and a special

color.  Under Windows, the indicator is drawn with a round mark inside.

If the radiobutton is not selected, then the indicator is drawn with a

deselected appearance, and the associated variable is

set to a different value (typically 0).

Under Unix, the indicator is drawn with a raised relief and no special

color.  Under Windows, the indicator is drawn without a round mark inside.

.VE

Typically, several radiobuttons share a single variable and the

value of the variable indicates which radiobutton is to be selected.

When a radiobutton is selected it sets the value of the variable to

indicate that fact;  each radiobutton also monitors the value of

the variable and automatically selects and deselects itself when the

variable's value changes.

By default the variable \fBselectedButton\fR

is used;  its contents give the name of the button that is

selected, or the empty string if no button associated with that

variable is selected.

The name of the variable for a radiobutton,

plus the variable to be stored into it, may be modified with options

on the command line or in the option database.

Configuration options may also be used to modify the way the

indicator is displayed (or whether it is displayed at all).

By default a radiobutton is configured to select itself on button clicks.

.SH "WIDGET COMMAND"

.PP

The \fBradiobutton\fR command creates a new Tcl command whose

name is \fIpathName\fR.  This

command may be used to invoke various

operations on the widget.  It has the following general form:

.CS

\fIpathName option \fR?\fIarg arg ...\fR?

.CE

\fIOption\fR and the \fIarg\fRs

determine the exact behavior of the command.  The following

commands are possible for radiobutton widgets:

.TP

\fIpathName \fBcget\fR \fIoption\fR

Returns the current value of the configuration option given

by \fIoption\fR.

\fIOption\fR may have any of the values accepted by the \fBradiobutton\fR

command.

.TP

\fIpathName \fBconfigure\fR ?\fIoption\fR? ?\fIvalue option value ...\fR?

Query or modify the configuration options of the widget.

If no \fIoption\fR is specified, returns a list describing all of

the available options for \fIpathName\fR (see \fBTk_ConfigureInfo\fR for

information on the format of this list).  If \fIoption\fR is specified

with no \fIvalue\fR, the command returns a list describing the

one named option (this list will be identical to the corresponding

sublist of the value returned if no \fIoption\fR is specified).  If

one or more \fIoption\-value\fR 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.

\fIOption\fR may have any of the values accepted by the \fBradiobutton\fR

command.

.TP

\fIpathName \fBdeselect\fR

Deselects the radiobutton and sets the associated variable to an

empty string.

If this radiobutton was not currently selected, the command has

no effect.

.TP

\fIpathName \fBflash\fR

Flashes the radiobutton.  This is accomplished by redisplaying the radiobutton

several times, alternating between active and normal colors.  At

the end of the flash the radiobutton is left in the same normal/active

state as when the command was invoked.

This command is ignored if the radiobutton's state is \fBdisabled\fR.

.TP

\fIpathName \fBinvoke\fR

Does just what would have happened if the user invoked the radiobutton

with the mouse: selects the button and invokes

its associated Tcl command, if there is one.

The return value is the return value from the Tcl command, or an

empty string if there is no command associated with the radiobutton.

This command is ignored if the radiobutton's state is \fBdisabled\fR.

.TP

\fIpathName \fBselect\fR

Selects the radiobutton and sets the associated variable to the

value corresponding to this widget.

.SH BINDINGS

.PP

Tk automatically creates class bindings for radiobuttons that give them

the following default behavior:

.VS

.IP [1]

On Unix systems, a radiobutton activates whenever the mouse passes

over it and deactivates whenever the mouse leaves the radiobutton.  On

Mac and Windows systems, when mouse button 1 is pressed over a

radiobutton, the button activates whenever the mouse pointer is inside

the button, and deactivates whenever the mouse pointer leaves the

button.

.VE

.IP [2]

When mouse button 1 is pressed over a radiobutton it is invoked (it

becomes selected and the command associated with the button is

invoked, if there is one).

.IP [3]

When a radiobutton has the input focus, the space key causes the radiobutton

to be invoked.

.PP

If the radiobutton's state is \fBdisabled\fR then none of the above

actions occur:  the radiobutton is completely non-responsive.

.PP

The behavior of radiobuttons can be changed by defining new bindings for

individual widgets or by redefining the class bindings.

.SH KEYWORDS

radiobutton, widget