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tk(n)                                       Tk Built-In Commands                                       tk(n)



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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 infor-mation information
       mation 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 depend-ing depending
       ing on the option argument.  The legal forms are:

       tk appname ?newName?
              If newName isn't 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  applica-tion. application.
              tion.   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  set- |
              ting  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 argu-ment argument
              ment is omitted, it defaults to the main window.  If the number argument is omitted, the  cur-rent current
              rent 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 fac-tor, factor,
              tor, but it is undefined whether existing widgets will resize themselves dynamically to  acco-modate accomodate
              modate the new scaling factor.

       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 (ie: 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 windowingsys-                                                                                      |
       tem                                                                                    |              |
              Returns the current Tk windowing system, one of x11 (X11-based), win32 (MS  Windows),  classic |
              (Mac OS Classic), or aqua (Mac OS X Aqua).

KEYWORDS
       application name, send



Tk                                                   8.4                                               tk(n)