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FreeBSD/Linux/UNIX General Commands Manual
Hypertext Man Pages
checkbutton
 
checkbutton(n)		     Tk Built-In Commands		checkbutton(n)



NAME
       checkbutton - Create and manipulate checkbutton widgets

SYNOPSIS
       checkbutton   pathName	?options?   -activebackground	-disabledfore-
       ground -padx    -activeforeground   -font     -pady    -anchor	-fore-
       ground	 -relief    -background    -highlightbackground     -takefocus
       -bitmap	 -highlightcolor     -text     -borderwidth   -highlightthick-
       ness -textvariable    -compound -image	 -underline    -cursor	 -jus-
       tify  -wraplength

WIDGET-SPECIFIC OPTIONS
       Specifies a Tcl command to associate with the button.  This command  is
       typically  invoked when mouse button 1 is released over the button win-
       dow.  The button's global variable (-variable option) will  be  updated
       before the command is invoked.  Specifies a desired height for the but-
       ton.  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_Get-
       Pixels); for text it is in lines of text.  If this option isn't	speci-
       fied,  the  button's  desired  height  is computed from the size of the
       image or bitmap or text being displayed in it.	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.  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 Bold, Italic, and Underline checkbuttons on
       the toolbar of a word-processor, for example.  Specifies value to store
       in the button's associated variable whenever this button is deselected.
       Defaults to ``0''.  Specifies value to store in the button's associated
       variable  whenever this button is selected.  Defaults to ``1''.	Speci-
       fies an alternative relief for the checkbutton, to  be  used  when  the
       mouse cursor is over the widget.  This option can be used to make tool-
       bar 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 checkbutton.  The  empty	string
       is  the	default  value.   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 display-
       ing when the widget is selected.  Specifies an  image  to  display  (in
       place  of  the  image  option)  when the checkbutton is selected.  This
       option is ignored unless the image option has been  specified.	Speci-
       fies  one of three states for the checkbutton:  normal, active, or dis-
       abled.  In normal state the checkbutton is displayed  using  the  fore-
       ground and background options.  The active state is typically used when
       the pointer is over the checkbutton.  In active state  the  checkbutton
       is  displayed  using the activeForeground and activeBackground options.
       Disabled state means that the checkbutton should be  insensitive:   the
       default	bindings  will	refuse	to activate the widget and will ignore
       mouse button presses.  In this state the disabledForeground  and  back-
       ground  options	determine how the checkbutton is displayed.  Specifies
       name of global variable to set to indicate whether or not  this	button
       is  selected.   Defaults  to  the  name of the button within its parent
       (i.e. the last element of the button window's path name).  Specifies  a
       desired width 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 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  checkbutton  command  creates  a new window (given by the pathName
       argument) and makes it into a checkbutton widget.  Additional  options,
       described  above, may be specified on the command line or in the option
       database to configure aspects of the checkbutton such  as  its  colors,
       font,  text,  and  initial relief.  The checkbutton 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  checkbutton  is  a  widget that displays a textual string, bitmap or
       image and a square 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 under-
       lined using the underline option.  A checkbutton has all of the	behav-
       ior  of a simple button, including the following: 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 checkbutton.

       In  addition,  checkbuttons  can  be  selected.	 If  a	checkbutton is
       selected then the indicator is normally drawn with a  selected  appear-
       ance,  and  a  Tcl variable associated with the checkbutton 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 check mark inside.	If the checkbutton  is	not  selected,
       then the indicator is drawn with a deselected appearance, and the asso-
       ciated 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 check mark inside.   By
       default,  the name of the variable associated with a checkbutton is the
       same as the name used to create the checkbutton.   The  variable  name,
       and  the  ``on''  and ``off'' values stored in 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 checkbutton is  con-
       figured	to  select and deselect itself on alternate button clicks.  In
       addition, each checkbutton monitors its associated variable  and  auto-
       matically selects and deselects itself when the variables value changes
       to and from the button's ``on'' value.

WIDGET COMMAND
       The checkbutton command creates a new Tcl command whose name  is  path-
       Name.   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 checkbutton 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
	      checkbutton 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 avail-
	      able options for pathName (see Tk_ConfigureInfo for  information
	      on  the  format  of  this list).	If option is specified with no
	      value, then 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, then 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 checkbutton command.

       pathName deselect
	      Deselects the checkbutton and sets the  associated  variable  to
	      its ``off'' value.

       pathName flash
	      Flashes  the  checkbutton.  This is accomplished by redisplaying
	      the checkbutton several times, alternating  between  active  and
	      normal  colors.  At the end of the flash the checkbutton is left
	      in the same normal/active state as when the command was invoked.
	      This  command is ignored if the checkbutton's state is disabled.

       pathName invoke
	      Does just what would have  happened  if  the  user  invoked  the
	      checkbutton  with  the  mouse: toggle the selection state of the
	      button and invoke the Tcl command associated with the  checkbut-
	      ton, if there is one.  The return value is the return value from
	      the Tcl command, or an empty string if there is no command asso-
	      ciated  with  the  checkbutton.	This command is ignored if the
	      checkbutton's state is disabled.

       pathName select
	      Selects the checkbutton and sets the associated variable to  its
	      ``on'' value.

       pathName toggle
	      Toggles  the  selection state of the button, redisplaying it and
	      modifying its associated variable to reflect the new state.

BINDINGS
       Tk automatically creates class bindings for checkbuttons that give them
       the following default behavior:

       [1]    On  Unix	systems,  a  checkbutton  activates whenever the mouse
	      passes over it and deactivates whenever  the  mouse  leaves  the
	      checkbutton.  On Mac and Windows systems, when mouse button 1 is
	      pressed over a checkbutton, 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 checkbutton, it is invoked
	      (its selection state toggles and the command associated with the
	      button is invoked, if there is one).

       [3]    When a checkbutton has the input focus, the space key causes the
	      checkbutton  to be invoked.  Under Windows, there are additional
	      key bindings; plus (+) and equal	(=)  select  the  button,  and
	      minus (-) deselects the button.

       If  the	checkbutton's state is disabled then none of the above actions
       occur:  the checkbutton is completely non-responsive.

       The behavior of checkbuttons can be changed by  defining  new  bindings
       for individual widgets or by redefining the class bindings.


SEE ALSO
       button(n), options(n), radiobutton(n)


KEYWORDS
       checkbutton, widget



Tk				      4.4			checkbutton(n)
=191536
+171
(100)