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 containing a library of Tcl
scripts related to Tk. These scripts
include an initialization file that is nor-
mally processed whenever a Tk application
starts up, plus other files containing pro-
cedures 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 environ-
ment variable exists, then the directory it
names is checked first. If TK_LIBRARY
isn't set or doesn't refer to an appropri-
ate directory, then Tk checks several other
directories based on a compiled-in default
location, the location of the Tcl library
directory, the location of the binary con-
taining 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 cur-
rent patch level for Tk. The patch level
is incremented for each new release or
patch, and it uniquely identifies an offi-
cial version of Tk.
tkPriv This variable is an array containing sev-
eral pieces of information that are private
to Tk. The elements of tkPriv are used by
Tk library procedures and default bindings.
They should not be accessed by any code
outside Tk.
tk_strictMotif This variable is set to zero by default.
If an application 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
Tk 4.1 1
tkvars(n) Tk Built-In Commands tkvars(n)
and scrollbar sliders will not change color
when the pointer passes over them.
tk_version Tk sets this variable in the interpreter
for each application. The variable holds
the current version number of the Tk
library in the form major.minor. Major and
minor are integers. The major version num-
ber increases in any Tk release that
includes changes that are not backward com-
patible (i.e. whenever existing Tk applica-
tions and scripts may have to change to
work with the new release). The minor ver-
sion number increases with each new release
of Tk, except that it resets to zero when-
ever the major version number changes.
KEYWORDS
variables, version
Tk 4.1 2
