radiobutton \- Create and manipulate radio-button widgets
radiobutton pathName ?options?
activeBackground bitmap font relief activeForeground borderWidth foreground text anchor cursor padX textVariable background disabledForeground padX
See section options, for more information.
:command
Name="command" 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.
:height
Name="height" Class="
Height"
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 Tk_GetPixels); 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.
:selector
Name="selector" Class="
Foreground"
Specifies the color to draw in the selector when this button is selected. If specified as an empty string then no selector is drawn for the button.
:state
Name="state" Class="
State"
Specifies one of three states for the radio button: normal, active, or disabled. In normal state the radio button is displayed using the foreground and background 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 activeForeground and activeBackground 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 disabledForeground and background options determine how the radio button is displayed.
:value
Name="value" Class="
Value"
Specifies value to store in the button's associated variable whenever this button is selected. Defaults to the name of the radio button.
:variable
Name="variable" 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 selectedButton.
:width
Name="width" Class="
Width"
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 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 bitmap or text being displayed in it.
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 radio button 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 radio button is a widget that displays a textual string or bitmap and a diamond called a selector. 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 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, radio buttons can be selected. 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. 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. 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 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.
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 radio-button widgets:
Tk automatically creates class bindings for radio buttons that give them the following default behavior:
The behavior of radio buttons can be changed by defining new bindings for individual widgets or by redefining the class bindings.
radio button, widget
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