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Radiobutton(3)        User Contributed Perl Documentation       Radiobutton(3)




NAME

       Tk::Radiobutton - Create and manipulate Radiobutton widgets


SYNOPSIS

       $radiobutton = $parent->Radiobutton(?options?);


STANDARD OPTIONS

       -activebackground -activeforeground -anchor -background -bitmap
       -borderwidth -compound -cursor -disabledforeground -font -foreground
       -highlightbackground -highlightcolor -highlightthickness -image
       -justify -padx -pady -relief -takefocus -text -textvariable -underline
       -wraplength

       See Tk::options for details of the standard options.


WIDGET-SPECIFIC OPTIONS

       Name:     command
       Class:    Command
       Switch:   -command
           Specifies a perl/Tk callback 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.

       Name:     height
       Class:    Height
       Switch:   -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 specified, the button's
           desired height is computed from the size of the image or bitmap or
           text being displayed in it.

       Name:     indicatorOn
       Class:    IndicatorOn
       Switch:   -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: -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 false
           -overrelief 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 Bold, Italic, and
           Underline checkbuttons 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 button, 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
           button.  The empty string is the default value.

       Name:     selectColor
       Class:    Background
       Switch:   -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.

       Name:     selectImage
       Class:    SelectImage
       Switch:   -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.

       Name:     state
       Class:    State
       Switch:   -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.

       Name:     value
       Class:    Value
       Switch:   -value
           Specifies value to store in the button's associated variable
           whenever this button is selected.

       Name:     variable
       Class:    Variable
       Switch:   -variable
           Specifies reference to a 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 "\$Tk::selectedButton".

       Name:     width
       Class:    Width
       Switch:   -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 it.


DESCRIPTION

       The Radiobutton method creates a new window (given by the $widget
       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
       $widget argument.  At the time this command is invoked, there must not
       exist a window named $widget, but $widget'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 perl/Tk callback 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 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.  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 METHODS

       The Radiobutton method creates a widget object.  This object supports
       the configure and cget methods described in Tk::options which can be
       used to enquire and modify the options described above.  The widget
       also inherits all the methods provided by the generic Tk::Widget class.

       The following additional methods are available for radiobutton widgets:

       $radiobutton->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.

       $radiobutton->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.

       $radiobutton->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.

       $radiobutton->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.


KEYWORDS

       radiobutton, widget


POD ERRORS

       Hey! The above document had some coding errors, which are explained
       below:

       Around line 57:
           alternative text 'perl/Tk callback' contains non-escaped | or /

       Around line 206:
           alternative text 'perl/Tk callback' contains non-escaped | or /



perl v5.18.0                      2012-01-16                    Radiobutton(3)

perl-Tk 804.030_502 - Generated Fri Aug 16 08:18:43 CDT 2013
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