tkvars(n) Tk Built-In Commands tkvars(n)______________________________________________________________________________NAMEtkvars - Variables used or set by Tk
_________________________________________________________________DESCRIPTION
The following Tcl variables are either set or used by Tk at various
times in its execution:
tk_library This variable holds the file name for a directory con‐
taining a library of Tcl scripts related to Tk. These
scripts include an initialization file that is normally
processed whenever a Tk application starts up, plus
other files containing procedures that implement default
behaviors for widgets. The initial value of tcl_library
is set when Tk is added to an interpreter; this is done
by searching several different directories until one is
found that contains an appropriate Tk startup script.
If the TK_LIBRARY environment variable exists, then the
directory it names is checked first. If TK_LIBRARY is
not set or does not refer to an appropriate directory,
then Tk checks several other directories based on a com‐
piled-in default location, the location of the Tcl
library directory, the location of the binary containing
the application, and the current working directory. The
variable can be modified by an application to switch to
a different library.
tk_patchLevel Contains a decimal integer giving the current patch
level for Tk. The patch level is incremented for each
new release or patch, and it uniquely identifies an
official version of Tk.
tk::Priv This variable is an array containing several pieces of
information that are private to Tk. The elements of
tk::Priv are used by Tk library procedures and default
bindings. They should not be accessed by any code out‐
side Tk.
tk_strictMotif This variable is set to zero by default. If an applica‐
tion sets it to one, then Tk attempts to adhere as
closely as possible to Motif look-and-feel standards.
For example, active elements such as buttons and scroll‐
bar sliders will not change color when the pointer
passes over them.
tk_textRedraw
tk_textRelayout
These variables are set by text widgets when they have
debugging turned on. The values written to these vari‐
ables can be used to test or debug text widget opera‐
tions. These variables are mostly used by Tk's test
suite.
tk_version Tk sets this variable in the interpreter for each appli‐
cation. The variable holds the current version number
of the Tk library in the form major.minor. Major and
minor are integers. The major version number increases
in any Tk release that includes changes that are not
backward compatible (i.e. whenever existing Tk applica‐
tions and scripts may have to change to work with the
new release). The minor version number increases with
each new release of Tk, except that it resets to zero
whenever the major version number changes.
KEYWORDS
variables, version, text
Tk 4.1 tkvars(n)
