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.
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 displaying 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 -indicatoron 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 typically 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 disabledForeground 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 the name of a 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.
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 computed 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 initial 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 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). The indicator is drawn without a round mark inside. 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. 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.
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
information 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 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 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 behavior:
- [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.
- [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 completely 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(3tk), labelframe(3tk), listbox(3tk), options(3tk), scale(3tk),
ttk::radiobutton(3tk)
KEYWORDS¶
radiobutton, widget