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radiobutton(n) Tk Built-In Commands radiobutton(n)
____________________________________________________________________________________________________________
NAME
radiobutton - Create and manipulate radiobutton widgets
SYNOPSIS
radiobutton pathName ?options?
STANDARD OPTIONS
-activebackground -disabledforeground -padx
-activeforeground -font -pady
-anchor -foreground -relief
-background -highlightbackground -takefocus
-bitmap -highlightcolor -text
-borderwidth -highlightthickness -textvariable
-compound -image -underline
-cursor -justify -wraplength
See the options manual entry for details on the standard options.
WIDGET-SPECIFIC OPTIONS
Command-Line Name:-command
Database Name: command
Database Class: 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.
Command-Line Name:-height
Database Name: height
Database Class: 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 is not specified, the button's desired height
is computed from the size of the image or bitmap or text being displayed in it.
Command-Line Name:-indicatoron
Database Name: indicatorOn
Database Class: 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.
Command-Line Name:-selectcolor
Database Name: selectColor
Database Class: Background
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 dis-playing displaying
playing when the widget is selected.
Command-Line Name:-offrelief
Database Name: offRelief
Database Class: OffRelief
Specifies the relief for the checkbutton when the indicator is not drawn and the checkbutton
is off. The default value is "raised". By setting this option to "flat" and setting -indica-toron -indicatoron
toron to false and -overrelief to "raised", the effect is achieved of having a flat button
that raises on mouse-over and which is depressed when activated. This is the behavior typi-cally typically
cally exhibited by the Align-Left, Align-Right, and Center radiobuttons on the toolbar of a
word-processor, for example.
Command-Line Name:-overrelief
Database Name: overRelief
Database Class: OverRelief
Specifies an alternative relief for the radiobutton, to be used when the mouse cursor is over
the widget. This option can be used to make toolbar buttons, by configuring -relief flat
-overrelief raised. If the value of this option is the empty string, then no alternative
relief is used when the mouse cursor is over the radiobutton. The empty string is the default
value.
Command-Line Name:-selectimage
Database Name: selectImage
Database Class: 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.
Command-Line Name:-state
Database Name: state
Database Class: 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 insensitive: the default bindings will refuse to
activate the widget and will ignore mouse button presses. In this state the disabledFore-ground disabledForeground
ground and background options determine how the radiobutton is displayed.
Command-Line Name:-tristateimage
Database Name: tristateImage
Database Class: TristateImage
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.
Command-Line Name:-tristatevalue
Database Name: tristateValue
Database Class: Value
Specifies the value that causes the radiobutton to display the multi-value selection, also |
known as the tri-state mode. Defaults to "".
Command-Line Name:-value
Database Name: value
Database Class: Value
Specifies value to store in the button's associated variable whenever this button is selected.
Command-Line Name:-variable
Database Name: variable
Database Class: 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 selected-Button. selectedButton.
Button.
Command-Line Name:-width
Database Name: width
Database Class: 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 is not specified, the button's desired width is com-puted computed
puted from the size of the image or bitmap or text being displayed in it.
____________________________________________________________________________________________________________
DESCRIPTION
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 ini-tial initial
tial relief. The radiobutton command returns its pathName argument. At the time this command is
invoked, there must not exist a window named pathName, 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 multi-ple multiple
ple 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 dif-ferent different
ferent 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 but-ton. button.
ton.
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 par-ticular particular
ticular 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). The indicator is drawn without a round mark inside. Typi-cally, Typically,
cally, 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. If the variable's value matches the |
tristateValue, then the radiobutton is drawn using the tri-state mode. This mode is used to indicate |
mixed or multiple values. (This is used when the radiobutton represents the state of multiple |
items.) 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 clicks.
WIDGET COMMAND
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 form:
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 specified, returns a
list describing all of the available options for pathName (see Tk_ConfigureInfo for informa-tion information
tion on the format of this list). If option is specified 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 spec-ified, specified,
ified, 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
radiobutton command.
pathName deselect
Deselects the radiobutton and sets the associated variable to an empty string. If this
radiobutton was not currently selected, the command has no effect.
pathName flash
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 disabled.
pathName invoke
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.
pathName select
Selects the radiobutton and sets the associated variable to the value corresponding to this
widget.
BINDINGS
Tk automatically creates class bindings for radiobuttons that give them the following default behav-ior: behavior:
ior:
[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 but-ton, button,
ton, and deactivates whenever the mouse pointer leaves the button.
[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).
[3] When a radiobutton has the input focus, the space key causes the radiobutton to be invoked.
If the radiobutton's state is disabled then none of the above actions occur: the radiobutton is com-pletely completely
pletely non-responsive.
The behavior of radiobuttons can be changed by defining new bindings for individual widgets or by
redefining the class bindings.
SEE ALSO
checkbutton(n), labelframe(n), listbox(n), options(n), scale(n), ttk::radiobutton(n)
KEYWORDS
radiobutton, widget
Tk 4.4 radiobutton(n)
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