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'\" $Header: /user6/ouster/wish/man/RCS/radiobutton.n,v 1.21 93/04/01 09:52:52 ouster Exp $ SPRITE (Berkeley)
'/" 
.so man.macros
.HS radiobutton tk
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
radiobutton \- Create and manipulate radio-button widgets
.SH SYNOPSIS
\fBradiobutton\fI \fIpathName \fR?\fIoptions\fR?
.SH "STANDARD OPTIONS"
.LP
.nf
.ta 4c 8c 12c
.VS
\fBactiveBackground\fR	\fBbitmap\fR	\fBfont\fR	\fBrelief\fR
\fBactiveForeground\fR	\fBborderWidth\fR	\fBforeground\fR	\fBtext\fR
\fBanchor\fR	\fBcursor\fR	\fBpadX\fR	\fBtextVariable\fR
\fBbackground\fR	\fBdisabledForeground\fR	\fBpadX\fR
.VE
.fi
.LP
See the ``options'' manual entry for details on the standard options.
.SH "WIDGET-SPECIFIC OPTIONS"
.ta 4c
.LP
.nf
Name:	\fBcommand\fR
Class:	\fBCommand\fR
Command-Line Switch:	\fB\-command\fR
.fi
.IP
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.
.LP
.nf
.VS
Name:	\fBheight\fR
Class:	\fBHeight\fR
Command-Line Switch:	\fB\-height\fR
.fi
.IP
Specifies a desired height for the button.
If a 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 bitmap or text being displayed in it.
.VE
.LP
.nf
Name:	\fBselector\fR
Class:	\fBForeground\fR
Command-Line Switch:	\fB\-selector\fR
.fi
.IP
Specifies the color to draw in the selector when this button is
selected.
.VS
If specified as an empty string then no selector is drawn for the button.
.LP
.nf
Name:	\fBstate\fR
Class:	\fBState\fR
Command-Line Switch:	\fB\-state\fR
.fi
.IP
Specifies one of three states for the radio button:  \fBnormal\fR, \fBactive\fR,
or \fBdisabled\fR.  In normal state the radio button is displayed using the
\fBforeground\fR and \fBbackground\fR options.  The active state is
typically used when the pointer is over the radio button.  In active state
the radio button is displayed using the \fBactiveForeground\fR and
\fBactiveBackground\fR options.  Disabled state means that the radio button
is insensitive:  it doesn't activate and doesn't respond to mouse
button presses.  In this state the \fBdisabledForeground\fR and
\fBbackground\fR options determine how the radio button is displayed.
.VE
.LP
.nf
Name:	\fBvalue\fR
Class:	\fBValue\fR
Command-Line Switch:	\fB\-value\fR
.fi
.IP
Specifies value to store in the button's associated variable whenever
this button is selected.  Defaults to the name of the radio button.
.LP
.nf
Name:	\fBvariable\fR
Class:	\fBVariable\fR
Command-Line Switch:	\fB\-variable\fR
.fi
.IP
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.
.LP
.nf
.VS
Name:	\fBwidth\fR
Class:	\fBWidth\fR
Command-Line Switch:	\fB\-width\fR
.fi
.IP
Specifies a desired width for the button.
If a 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 characters.
If this option isn't specified, the button's desired width is computed
from the size of the bitmap or text being displayed in it.
.VE
.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 radio button 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
A radio button is a widget
.VS
that displays a textual string or bitmap
and a diamond called a \fIselector\fR.
A radio button 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;
.VE
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, radio buttons can be \fIselected\fR.
If a radio button is selected then a special highlight appears
in the selector and a Tcl variable associated with the radio button
is set to a particular value.
If the radio button is not selected then the selector is drawn
in a different fashion.
Typically, several radio buttons share a single variable and the
value of the variable indicates which radio button is to be selected.
.VS
When a radio button is selected it sets the value of the variable to
indicate that fact;  each radio button also monitors the value of
the variable and automatically selects and deselects itself when the
variable's value changes.
.VE
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 radio button,
plus the variable to be stored into it, may be modified with options
on the command line or in the option database.  By default a radio
button 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:
.DS C
\fIpathName option \fR?\fIarg arg ...\fR?
.DE
\fIOption\fR and the \fIarg\fRs
determine the exact behavior of the command.  The following
commands are possible for radio-button widgets:
.TP
\fIpathName \fBactivate\fR
Change the radio button's state to \fBactive\fR and redisplay the button
using its active foreground and background colors instead of normal
colors.
.VS
This command is ignored if the radio button's state is \fBdisabled\fR.
This command is obsolete and will eventually be removed;
use ``\fIpathName \fBconfigure \-state active\fR'' instead.
.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, then 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, then 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 \fBdeactivate\fR
Change the radio button's state to \fBnormal\fR and redisplay the button
using its normal foreground and background colors.
.VS
This command is ignored if the radio button's state is \fBdisabled\fR.
This command is obsolete and will eventually be removed;
use ``\fIpathName \fBconfigure \-state normal\fR'' instead.
.VE
.TP
\fIpathName \fBdeselect\fR
Deselect the radio button:  redisplay it without a highlight in
the selector and set the associated variable to an empty string.  If
this radio button was not currently selected, then the command has
no effect.
.TP
\fIpathName \fBflash\fR
Flash the radio button.  This is accomplished by redisplaying the radio button
several times, alternating between active and normal colors.  At
the end of the flash the radio button is left in the same normal/active
state as when the command was invoked.
.VS
This command is ignored if the radio button's state is \fBdisabled\fR.
.VE
.TP
\fIpathName \fBinvoke\fR
.VS
Does just what would have happened if the user invoked the radio button
with the mouse: select the button and invoke
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 radio button.
This command is ignored if the radio button's state is \fBdisabled\fR.
.VE
.TP
\fIpathName \fBselect\fR
Select the radio button:  display it with a highlighted
selector and set the associated variable to the value corresponding
to this widget.

.SH BINDINGS
.PP
.VS
Tk automatically creates class bindings for radio buttons that give them
the following default behavior:
.IP [1]
The radio button activates whenever the mouse passes over it and deactivates
whenever the mouse leaves the radio button.
.IP [2]
The radio button's relief is changed to sunken whenever mouse button 1 is
pressed over it, and the relief is restored to its original
value when button 1 is later released.
.IP [3]
If mouse button 1 is pressed over the radio button and later released over
the radio button, the radio button is invoked (i.e. it is selected
and the command associated with the button is invoked,
if there is one).  However, if the mouse is not
over the radio button when button 1 is released, then no invocation occurs.
.PP
The behavior of radio buttons can be changed by defining new bindings for
individual widgets or by redefining the class bindings.
.VE

.SH KEYWORDS
radio button, widget