NAME

       tk - Manipulate Tk internal state

SYNOPSIS

       tk option ?arg arg ...?
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DESCRIPTION

       The  tk command provides access to miscellaneous elements of Tk's internal state.  Most of
       the information manipulated by this command pertains to the application as a whole, or  to
       a  screen  or  display, rather than to a particular window.  The command can take any of a
       number of different forms depending on the option argument.  The legal forms are:

       tk appname ?newName?
              If newName is not specified, this command returns the name of the application  (the
              name  that  may  be used in send commands to communicate with the application).  If
              newName is specified, then the name of the application is changed to  newName.   If
              the  given  name  is  already  in  use, then a suffix of the form “ #2” or “ #3” is
              appended in order to make the name  unique.   The  command's  result  is  the  name
              actually  chosen.   newName  should  not  start  with  a capital letter.  This will
              interfere with option processing, since names starting with capitals are assumed to
              be  classes;   as  a  result,  Tk  may  not  be  able  to find some options for the
              application.  If sends have been  disabled  by  deleting  the  send  command,  this
              command will reenable them and recreate the send command.

       tk caret window ?-x x? ?-y y? ?-height height?
              Sets  and  queries  the  caret  location for the display of the specified Tk window
              window.  The caret is the per-display cursor location used  for  indicating  global
              focus  (e.g.  to  comply  with  Microsoft Accessibility guidelines), as well as for
              location of the over-the-spot XIM (X Input Methods) or Windows IME windows.  If  no
              options  are  specified,  the  last values used for setting the caret are return in
              option-value pair format.  -x and -y  represent  window-relative  coordinates,  and
              -height  is  the  height  of  the  current  cursor  location,  or the height of the
              specified window if none is given.

       tk scaling ?-displayof window? ?number?
              Sets and queries the current scaling factor used by Tk to convert between  physical
              units  (for  example,  points,  inches,  or  millimeters)  and  pixels.  The number
              argument is a floating point number that specifies the number of pixels  per  point
              on  window's  display.   If the window argument is omitted, it defaults to the main
              window.  If the number argument is omitted, the current value of the scaling factor
              is returned.

              A  “point”  is  a  unit of measurement equal to 1/72 inch.  A scaling factor of 1.0
              corresponds to 1 pixel per point, which is equivalent to a standard 72 dpi monitor.
              A scaling factor of 1.25 would mean 1.25 pixels per point, which is the setting for
              a 90 dpi monitor; setting the scaling factor to 1.25 on  a  72  dpi  monitor  would
              cause  everything in the application to be displayed 1.25 times as large as normal.
              The initial value for the scaling factor is set when the application starts,  based
              on  properties  of  the  installed  monitor,  but  it  can  be changed at any time.
              Measurements made after the scaling factor is changed  will  use  the  new  scaling
              factor,  but  it  is  undefined  whether  existing  widgets  will resize themselves
              dynamically to accommodate the new scaling factor.

       tk inactive ?-displayof window? ?reset?
              Returns a positive integer, the number of milliseconds since the last time the user
              interacted with the system. If the -displayof option is given then the return value
              refers to the display of  window;  otherwise  it  refers  to  the  display  of  the
              application's main window.

              tk  inactive will return -1, if querying the user inactive time is not supported by
              the system, and in safe interpreters.

              If the literal string reset is given as an additional argument, the timer is  reset
              and an empty string is returned. Resetting the inactivity time is forbidden in safe
              interpreters and will throw and error if tried.

       tk useinputmethods ?-displayof window? ?boolean?
              Sets and queries the state of whether Tk should  use  XIM  (X  Input  Methods)  for
              filtering  events.   The  resulting state is returned.  XIM is used in some locales
              (i.e., Japanese, Korean), to handle special input devices.  This  feature  is  only
              significant  on X.  If XIM support is not available, this will always return 0.  If
              the window argument is omitted, it defaults to the main  window.   If  the  boolean
              argument  is  omitted, the current state is returned.  This is turned on by default
              for the main display.

       tk windowingsystem
              Returns the current  Tk  windowing  system,  one  of  x11  (X11-based),  win32  (MS
              Windows), or aqua (Mac OS X Aqua).

SEE ALSO

       send(3tk), winfo(3tk)

KEYWORDS

       application name, send