radiobutton(n) Tk Built-In Commands radiobutton(n)
radiobutton - Create and manipulate radiobutton widgets
radiobutton pathName ?options?
-activebackground -cursor -highlightthickness-takefocus
-activeforeground -disabledforeground -image-text
-anchor -font -justify-textvariable
-background -foreground -padx-underline
-bitmap -highlightbackground -pady-wraplength
-borderwidth -highlightcolor -relief
See the options manual entry for details on the standard options.
[-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 (-variable option) will be updated before the command is invoked.
[-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 Tk_GetPixels); for text it is in lines of text. If this option isn't speci-
fied, the button's desired height is computed from the size of the image or bitmap or text
being displayed in it. [-indicatoron indicatorOn] Specifies whether or not the indicator
should be drawn. Must be a proper boolean value. If false, the relief option is ignored
and the widget's relief is always sunken if the widget is selected and raised otherwise.
[-selectcolor selectColor] Specifies a background color to use when the button is
selected. If indicatorOn 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
indicatorOn is false, this color is used as the background for the entire widget, in place
of background or activeBackground, whenever the widget is selected. If specified as an
empty string then no special color is used for displaying when the widget is selected.
[-selectimage selectImage] Specifies an image to display (in place of the image option)
when the radiobutton is selected. This option is ignored unless the image option has been
specified. [-state state] Specifies one of three states for the radiobutton: normal,
active, or disabled. In normal state the radiobutton is displayed using the foreground
and background options. The active state is typically used when the pointer is over the
radiobutton. In active state the radiobutton is displayed using the activeForeground and
activeBackground options. Disabled state means that the radiobutton should be insensi-
tive: the default bindings will refuse to activate the widget and will ignore mouse but-
ton presses. In this state the disabledForeground and background options determine how
the radiobutton is displayed. [-value value] Specifies value to store in the button's
associated variable whenever this button is selected. [-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 selectedButton.
[-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
Tk_GetPixels); 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
The radiobutton command creates a new window (given by the pathName 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 radiobutton command returns its pathName
argument. At the time this command is invoked, there must not exist a window named path-
Name, but pathName's parent must exist.
A radiobutton is a widget that displays a textual string, bitmap or image and a diamond or |
circle called an indicator. 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 wrapLength option) and one of the characters may optionally be underlined
using the underline 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 state 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.
In addition, radiobuttons can be selected. If a radiobutton is selected, the indicator is
normally 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. Typically, several radiobut-
tons 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 indi-
cate that fact; each radiobutton also monitors the value of the variable and automati-
cally selects and deselects itself when the variable's value changes. By default the
variable selectedButton 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
The radiobutton command creates a new Tcl command whose name is pathName. This command
may be used to invoke various operations on the widget. It has the following general
pathName option ?arg arg ...?
Option and the args determine the exact behavior of the command. The following commands
are possible for radiobutton 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 radiobutton command.
pathName configure ?option? ?value option value ...?
Query or modify the configuration options of the widget. If no option is speci-
fied, returns a list describing all of the available options for pathName (see
Tk_ConfigureInfo for information on the format of this list). If option is speci-
fied with no value, 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 option is specified). If one or more option-value pairs are specified, the com-
mand 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 radiobutton command.
Deselects the radiobutton and sets the associated variable to an empty string. If
this radiobutton was not currently selected, the command has no effect.
Flashes the radiobutton. This is accomplished by redisplaying the radiobutton sev-
eral 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 disabled.
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 disabled.
Selects the radiobutton and sets the associated variable to the value corresponding
to this widget.
Tk automatically creates class bindings for radiobuttons that give them the following
default behavior: |
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.
 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).
 When a radiobutton has the input focus, the space key causes the radiobutton to be
If the radiobutton's state is disabled then none of the above actions occur: the
radiobutton is completely non-responsive.
The behavior of radiobuttons can be changed by defining new bindings for individual wid-
gets or by redefining the class bindings.
Tk 4.4 radiobutton(n)