1checkbutton(n) Tk Built-In Commands checkbutton(n)
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6
8 checkbutton - Create and manipulate checkbutton widgets
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11 checkbutton pathName ?options?
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14 -activebackground -disabledforeground -padx
15 -activeforeground -font -pady
16 -anchor -foreground -relief
17 -background -highlightbackground -takefocus
18 -bitmap -highlightcolor -text
19 -borderwidth -highlightthickness -textvariable
20 -compound -image -underline
21 -cursor -justify -wraplength
22 See the options manual entry for details on the standard options.
24
26 [-command command] Specifies a Tcl command to associate with the but‐
27 ton. This command is typically invoked when mouse button 1 is released
28 over the button window. The button's global variable (-variable
29 option) will be updated before the command is invoked.
30 [-height height] Specifies a desired height for the button. If an
31 image or bitmap is being displayed in the button then the value is in
32 screen units (i.e. any of the forms acceptable to Tk_GetPixels); for
33 text it is in lines of text. If this option is not specified, the but‐
34 ton's desired height is computed from the size of the image or bitmap
35 or text being displayed in it. [-indicatoron indicatorOn] Specifies
36 whether or not the indicator should be drawn. Must be a proper boolean
37 value. If false, the relief option is ignored and the widget's relief
38 is always sunken if the widget is selected and raised otherwise.
39 [-offrelief offRelief] Specifies the relief for the checkbutton when
40 the indicator is not drawn and the checkbutton is off. The default
41 value is “raised”. By setting this option to “flat” and setting -indi‐
42 catoron to false and -overrelief to “raised”, the effect is achieved of
43 having a flat button that raises on mouse-over and which is depressed
44 when activated. This is the behavior typically exhibited by the Bold,
45 Italic, and Underline checkbuttons on the toolbar of a word-processor,
46 for example. [-offvalue offValue] Specifies value to store in the but‐
47 ton's associated variable whenever this button is deselected. Defaults
48 to “0”. [-onvalue onValue] Specifies value to store in the button's
49 associated variable whenever this button is selected. Defaults to “1”.
50 [-overrelief overRelief] Specifies an alternative relief for the check‐
51 button, to be used when the mouse cursor is over the widget. This
52 option can be used to make toolbar buttons, by configuring -relief flat
53 -overrelief raised. If the value of this option is the empty string,
54 then no alternative relief is used when the mouse cursor is over the
55 checkbutton. The empty string is the default value. [-select‐
56 color selectColor] Specifies a background color to use when the button
57 is selected. If indicatorOn is true then the color is used as the
58 background for the indicator regardless of the select state. If indi‐
59 catorOn is false, this color is used as the background for the entire
60 widget, in place of background or activeBackground, whenever the widget
61 is selected. If specified as an empty string then no special color is
62 used for displaying when the widget is selected. [-selectimage selec‐
63 tImage] Specifies an image to display (in place of the image option)
64 when the checkbutton is selected. This option is ignored unless the
65 image option has been specified. [-state state] Specifies one of three
66 states for the checkbutton: normal, active, or disabled. In normal
67 state the checkbutton is displayed using the foreground and background
68 options. The active state is typically used when the pointer is over
69 the checkbutton. In active state the checkbutton is displayed using
70 the activeForeground and activeBackground options. Disabled state
71 means that the checkbutton should be insensitive: the default bindings
72 will refuse to activate the widget and will ignore mouse button
73 presses. In this state the disabledForeground and background options
74 determine how the checkbutton is displayed. [-tristateimage tris‐
75 tateImage] Specifies an image to display (in place of the image option) │
76 when the checkbutton is in tri-state mode. This option is ignored │
77 unless the image option has been specified. [-tristatevalue tristate‐
78 Value] Specifies the value that causes the checkbutton to display the │
79 multi-value selection, also known as the tri-state mode. Defaults to │
80 “”. [-variable variable] Specifies name of global variable to set to
81 indicate whether or not this button is selected. Defaults to the name
82 of the button within its parent (i.e. the last element of the button
83 window's path name). [-width width] Specifies a desired width for the
84 button. If an image or bitmap is being displayed in the button then
85 the value is in screen units (i.e. any of the forms acceptable to
86 Tk_GetPixels); for text it is in characters. If this option is not
87 specified, the button's desired width is computed from the size of the
88 image or bitmap or text being displayed in it.
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90
92 The checkbutton command creates a new window (given by the pathName
93 argument) and makes it into a checkbutton widget. Additional options,
94 described above, may be specified on the command line or in the option
95 database to configure aspects of the checkbutton such as its colors,
96 font, text, and initial relief. The checkbutton command returns its
97 pathName argument. At the time this command is invoked, there must not
98 exist a window named pathName, but pathName's parent must exist.
99 A checkbutton is a widget that displays a textual string, bitmap or
101 image and a square called an indicator. If text is displayed, it must
102 all be in a single font, but it can occupy multiple lines on the screen
103 (if it contains newlines or if wrapping occurs because of the
104 wrapLength option) and one of the characters may optionally be under‐
105 lined using the underline option. A checkbutton has all of the behav‐
106 ior of a simple button, including the following: it can display itself
107 in either of three different ways, according to the state option; it
108 can be made to appear raised, sunken, or flat; it can be made to flash;
109 and it invokes a Tcl command whenever mouse button 1 is clicked over
110 the checkbutton.
111 In addition, checkbuttons can be selected. If a checkbutton is
113 selected then the indicator is normally drawn with a selected appear‐
114 ance, and a Tcl variable associated with the checkbutton is set to a
115 particular value (normally 1). The indicator is drawn with a check │
116 mark inside. If the checkbutton is not selected, then the indicator is │
117 drawn with a deselected appearance, and the associated variable is set │
118 to a different value (typically 0). The indicator is drawn without a │
119 check mark inside. In the special case where the variable (if speci‐ │
120 fied) has a value that matches the tristatevalue, the indicator is │
121 drawn with a tri-state appearance and is in the tri-state mode indicat‐ │
122 ing mixed or multiple values. (This is used when the check box repre‐ │
123 sents the state of multiple items.) The indicator is drawn in a plat‐ │
124 form dependent manner. Under Unix and Windows, the background interior │
125 of the box is “grayed”. Under Mac, the indicator is drawn with a dash │
126 mark inside. By default, the name of the variable associated with a │
127 checkbutton is the same as the name used to create the checkbutton. │
128 The variable name, and the “on”, “off” and “tristate” values stored in │
129 it, may be modified with options on the command line or in the option │
130 database. Configuration options may also be used to modify the way the │
131 indicator is displayed (or whether it is displayed at all). By default │
132 a checkbutton is configured to select and deselect itself on alternate │
133 button clicks. In addition, each checkbutton monitors its associated │
134 variable and automatically selects and deselects itself when the vari‐ │
135 ables value changes to and from the button's “on”, “off” and “tristate” │
136 values.
137
139 The checkbutton command creates a new Tcl command whose name is path‐
140 Name. This command may be used to invoke various operations on the
141 widget. It has the following general form:
142 pathName option ?arg arg ...?
143 Option and the args determine the exact behavior of the command. The
144 following commands are possible for checkbutton widgets:
145 pathName cget option
147 Returns the current value of the configuration option given by
148 option. Option may have any of the values accepted by the
149 checkbutton command.
150 pathName configure ?option? ?value option value ...?
152 Query or modify the configuration options of the widget. If no
153 option is specified, returns a list describing all of the avail‐
154 able options for pathName (see Tk_ConfigureInfo for information
155 on the format of this list). If option is specified with no
156 value, then the command returns a list describing the one named
157 option (this list will be identical to the corresponding sublist
158 of the value returned if no option is specified). If one or
159 more option-value pairs are specified, then the command modifies
160 the given widget option(s) to have the given value(s); in this
161 case the command returns an empty string. Option may have any
162 of the values accepted by the checkbutton command.
163 pathName deselect
165 Deselects the checkbutton and sets the associated variable to
166 its “off” value.
167 pathName flash
169 Flashes the checkbutton. This is accomplished by redisplaying
170 the checkbutton several times, alternating between active and
171 normal colors. At the end of the flash the checkbutton is left
172 in the same normal/active state as when the command was invoked.
173 This command is ignored if the checkbutton's state is disabled.
174 pathName invoke
176 Does just what would have happened if the user invoked the
177 checkbutton with the mouse: toggle the selection state of the
178 button and invoke the Tcl command associated with the checkbut‐
179 ton, if there is one. The return value is the return value from
180 the Tcl command, or an empty string if there is no command asso‐
181 ciated with the checkbutton. This command is ignored if the
182 checkbutton's state is disabled.
183 pathName select
185 Selects the checkbutton and sets the associated variable to its
186 “on” value.
187 pathName toggle
189 Toggles the selection state of the button, redisplaying it and
190 modifying its associated variable to reflect the new state.
191
193 Tk automatically creates class bindings for checkbuttons that give them
194 the following default behavior:
195 [1] On Unix systems, a checkbutton activates whenever the mouse
197 passes over it and deactivates whenever the mouse leaves the
198 checkbutton. On Mac and Windows systems, when mouse button 1 is
199 pressed over a checkbutton, the button activates whenever the
200 mouse pointer is inside the button, and deactivates whenever the
201 mouse pointer leaves the button.
202 [2] When mouse button 1 is pressed over a checkbutton, it is invoked
204 (its selection state toggles and the command associated with the
205 button is invoked, if there is one).
206 [3] When a checkbutton has the input focus, the space key causes the
208 checkbutton to be invoked. Under Windows, there are additional
209 key bindings; plus (+) and equal (=) select the button, and
210 minus (-) deselects the button.
211 If the checkbutton's state is disabled then none of the above actions
213 occur: the checkbutton is completely non-responsive.
214 The behavior of checkbuttons can be changed by defining new bindings
216 for individual widgets or by redefining the class bindings.
217
219 This example shows a group of uncoupled checkbuttons.
220 labelframe .lbl -text "Steps:"
222 checkbutton .c1 -text Lights -variable lights
223 checkbutton .c2 -text Cameras -variable cameras
224 checkbutton .c3 -text Action! -variable action
225 pack .c1 .c2 .c3 -in .lbl
226 pack .lbl
227
229 button(n), options(n), radiobutton(n), ttk::checkbutton(n)
230
232 checkbutton, widget
233Tk 4.4 checkbutton(n)