1Radiobutton(3)        User Contributed Perl Documentation       Radiobutton(3)
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NAME

6       Tk::Radiobutton - Create and manipulate Radiobutton widgets
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SYNOPSIS

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

12       -activebackground -activeforeground -anchor -background -bitmap
13       -borderwidth -compound -cursor -disabledforeground -font -foreground
14       -highlightbackground -highlightcolor -highlightthickness -image
15       -justify -padx -pady -relief -takefocus -text -textvariable -underline
16       -wraplength
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18       See Tk::options for details of the standard options.
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WIDGET-SPECIFIC OPTIONS

21       Name:     command
22       Class:    Command
23       Switch:   -command
24           Specifies a perl/Tk callback to associate with the button.  This
25           command is typically invoked when mouse button 1 is released over
26           the button window.  The button's global variable (-variable option)
27           will be updated before the command is invoked.
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29       Name:     height
30       Class:    Height
31       Switch:   -height
32           Specifies a desired height for the button.  If an image or bitmap
33           is being displayed in the button then the value is in screen units
34           (i.e. any of the forms acceptable to Tk_GetPixels); for text it is
35           in lines of text.  If this option isn't specified, the button's
36           desired height is computed from the size of the image or bitmap or
37           text being displayed in it.
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39       Name:     indicatorOn
40       Class:    IndicatorOn
41       Switch:   -indicatoron
42           Specifies whether or not the indicator should be drawn.  Must be a
43           proper boolean value.  If false, the relief option is ignored and
44           the widget's relief is always sunken if the widget is selected and
45           raised otherwise.
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47       Command-Line Name: -offrelief
48       Database Name:  offRelief
49       Database Class: OffRelief
50           Specifies the relief for the checkbutton when the indicator is not
51           drawn and the checkbutton is off.  The default value is raised.  By
52           setting this option to flat and setting -indicatoron false
53           -overrelief raised, the effect is achieved of having a flat button
54           that raises on mouse-over and which is depressed when activated.
55           This is the behavior typically exhibited by the Bold, Italic, and
56           Underline checkbuttons on the toolbar of a word-processor, for
57           example.
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59       Command-Line Name: -overrelief
60       Database Name:  overRelief
61       Database Class: OverRelief
62           Specifies  an alternative relief for the button, to be used when
63           the mouse cursor is over the widget.  This option can be used to
64           make  toolbar  buttons,  by configuring -relief flat -overrelief
65           raised.  If the value of this option is the empty  string,  then no
66           alternative relief is used when the mouse cursor is over the
67           button.  The empty string is the default value.
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69       Name:     selectColor
70       Class:    Background
71       Switch:   -selectcolor
72           Specifies a background color to use when the button is selected.
73           If indicatorOn is true then the color applies to the indicator.
74           Under Windows, this color is used as the background for the
75           indicator regardless of the select state.  If indicatorOn is false,
76           this color is used as the background for the entire widget, in
77           place of background or activeBackground, whenever the widget is
78           selected.  If specified as an empty string then no special color is
79           used for displaying when the widget is selected.
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81       Name:     selectImage
82       Class:    SelectImage
83       Switch:   -selectimage
84           Specifies an image to display (in place of the image option) when
85           the radiobutton is selected.  This option is ignored unless the
86           image option has been specified.
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88       Name:     state
89       Class:    State
90       Switch:   -state
91           Specifies one of three states for the radiobutton:  normal, active,
92           or disabled.  In normal state the radiobutton is displayed using
93           the foreground and background options.  The active state is
94           typically used when the pointer is over the radiobutton.  In active
95           state the radiobutton is displayed using the activeForeground and
96           activeBackground options.  Disabled state means that the
97           radiobutton should be insensitive:  the default bindings will
98           refuse to activate the widget and will ignore mouse button presses.
99           In this state the disabledForeground and background options
100           determine how the radiobutton is displayed.
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102       Name:     value
103       Class:    Value
104       Switch:   -value
105           Specifies value to store in the button's associated variable
106           whenever this button is selected.
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108       Name:     variable
109       Class:    Variable
110       Switch:   -variable
111           Specifies reference to a variable to set whenever this button is
112           selected.  Changes in this variable also cause the button to select
113           or deselect itself. Defaults to the value "\$Tk::selectedButton".
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115       Name:     width
116       Class:    Width
117       Switch:   -width
118           Specifies a desired width for the button.  If an image or bitmap is
119           being displayed in the button, the value is in screen units (i.e.
120           any of the forms acceptable to Tk_GetPixels); for text it is in
121           characters.  If this option isn't specified, the button's desired
122           width is computed from the size of the image or bitmap or text
123           being displayed in it.
124

DESCRIPTION

126       The Radiobutton method creates a new window (given by the $widget
127       argument) and makes it into a radiobutton widget.  Additional options,
128       described above, may be specified on the command line or in the option
129       database to configure aspects of the radiobutton such as its colors,
130       font, text, and initial relief.  The radiobutton command returns its
131       $widget argument.  At the time this command is invoked, there must not
132       exist a window named $widget, but $widget's parent must exist.
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134       A radiobutton is a widget that displays a textual string, bitmap or
135       image and a diamond or circle called an indicator.  If text is
136       displayed, it must all be in a single font, but it can occupy multiple
137       lines on the screen (if it contains newlines or if wrapping occurs
138       because of the wrapLength option) and one of the characters may
139       optionally be underlined using the underline option.  A radiobutton has
140       all of the behavior of a simple button: it can display itself in either
141       of three different ways, according to the state option; it can be made
142       to appear raised, sunken, or flat; it can be made to flash; and it
143       invokes a perl/Tk callback whenever mouse button 1 is clicked over the
144       check button.
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146       In addition, radiobuttons can be selected.  If a radiobutton is
147       selected, the indicator is normally drawn with a selected appearance,
148       and a Tcl variable associated with the radiobutton is set to a
149       particular value (normally 1).  Under Unix, the indicator is drawn with
150       a sunken relief and a special color.  Under Windows, the indicator is
151       drawn with a round mark inside.  If the radiobutton is not selected,
152       then the indicator is drawn with a deselected appearance, and the
153       associated variable is set to a different value (typically 0).  Under
154       Unix, the indicator is drawn with a raised relief and no special color.
155       Under Windows, the indicator is drawn without a round mark inside.
156       Typically, several radiobuttons share a single variable and the value
157       of the variable indicates which radiobutton is to be selected.  When a
158       radiobutton is selected it sets the value of the variable to indicate
159       that fact;  each radiobutton also monitors the value of the variable
160       and automatically selects and deselects itself when the variable's
161       value changes.  By default the variable selectedButton is used;  its
162       contents give the name of the button that is selected, or the empty
163       string if no button associated with that variable is selected.  The
164       name of the variable for a radiobutton, plus the variable to be stored
165       into it, may be modified with options on the command line or in the
166       option database.  Configuration options may also be used to modify the
167       way the indicator is displayed (or whether it is displayed at all).  By
168       default a radiobutton is configured to select itself on button clicks.
169

WIDGET METHODS

171       The Radiobutton method creates a widget object.  This object supports
172       the configure and cget methods described in Tk::options which can be
173       used to enquire and modify the options described above.  The widget
174       also inherits all the methods provided by the generic Tk::Widget class.
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176       The following additional methods are available for radiobutton widgets:
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178       $radiobutton->deselect
179           Deselects the radiobutton and sets the associated variable to an
180           empty string.  If this radiobutton was not currently selected, the
181           command has no effect.
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183       $radiobutton->flash
184           Flashes the radiobutton.  This is accomplished by redisplaying the
185           radiobutton several times, alternating between active and normal
186           colors.  At the end of the flash the radiobutton is left in the
187           same normal/active state as when the command was invoked.  This
188           command is ignored if the radiobutton's state is disabled.
189
190       $radiobutton->invoke
191           Does just what would have happened if the user invoked the
192           radiobutton with the mouse: selects the button and invokes its
193           associated Tcl command, if there is one.  The return value is the
194           return value from the Tcl command, or an empty string if there is
195           no command associated with the radiobutton.  This command is
196           ignored if the radiobutton's state is disabled.
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198       $radiobutton->select
199           Selects the radiobutton and sets the associated variable to the
200           value corresponding to this widget.
201

BINDINGS

203       Tk automatically creates class bindings for radiobuttons that give them
204       the following default behavior:
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206       [1] On Unix systems, a radiobutton activates whenever the mouse passes
207           over it and deactivates whenever the mouse leaves the radiobutton.
208           On Mac and Windows systems, when mouse button 1 is pressed over a
209           radiobutton, the button activates whenever the mouse pointer is
210           inside the button, and deactivates whenever the mouse pointer
211           leaves the button.
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213       [2] When mouse button 1 is pressed over a radiobutton it is invoked (it
214           becomes selected and the command associated with the button is
215           invoked, if there is one).
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217       [3] When a radiobutton has the input focus, the space key causes the
218           radiobutton to be invoked.
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220           If the radiobutton's state is disabled then none of the above
221           actions occur:  the radiobutton is completely non-responsive.
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223           The behavior of radiobuttons can be changed by defining new
224           bindings for individual widgets or by redefining the class
225           bindings.
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KEYWORDS

228       radiobutton, widget
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232perl v5.34.0                      2021-07-23                    Radiobutton(3)
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