1tkvars(n) Tk Built-In Commands tkvars(n)
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8 tkvars - Variables used or set by Tk
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13 The following Tcl variables are either set or used by Tk at various
14 times in its execution:
15 tk_library This variable holds the file name for a directory con‐
17 taining a library of Tcl scripts related to Tk. These
18 scripts include an initialization file that is normally
19 processed whenever a Tk application starts up, plus
20 other files containing procedures that implement default
21 behaviors for widgets. The initial value of tcl_library
22 is set when Tk is added to an interpreter; this is done
23 by searching several different directories until one is
24 found that contains an appropriate Tk startup script.
25 If the TK_LIBRARY environment variable exists, then the
26 directory it names is checked first. If TK_LIBRARY is
27 not set or does not refer to an appropriate directory,
28 then Tk checks several other directories based on a com‐
29 piled-in default location, the location of the Tcl
30 library directory, the location of the binary containing
31 the application, and the current working directory. The
32 variable can be modified by an application to switch to
33 a different library.
34 tk_patchLevel Contains a decimal integer giving the current patch
36 level for Tk. The patch level is incremented for each
37 new release or patch, and it uniquely identifies an
38 official version of Tk.
39 tk::Priv This variable is an array containing several pieces of
41 information that are private to Tk. The elements of
42 tk::Priv are used by Tk library procedures and default
43 bindings. They should not be accessed by any code out‐
44 side Tk.
45 tk_strictMotif This variable is set to zero by default. If an applica‐
47 tion sets it to one, then Tk attempts to adhere as
48 closely as possible to Motif look-and-feel standards.
49 For example, active elements such as buttons and scroll‐
50 bar sliders will not change color when the pointer
51 passes over them.
52 tk_textRedraw
54 tk_textRelayout
56 These variables are set by text widgets when they have
57 debugging turned on. The values written to these vari‐
58 ables can be used to test or debug text widget opera‐
59 tions. These variables are mostly used by Tk's test
60 suite.
61 tk_version Tk sets this variable in the interpreter for each appli‐
63 cation. The variable holds the current version number
64 of the Tk library in the form major.minor. Major and
65 minor are integers. The major version number increases
66 in any Tk release that includes changes that are not
67 backward compatible (i.e. whenever existing Tk applica‐
68 tions and scripts may have to change to work with the
69 new release). The minor version number increases with
70 each new release of Tk, except that it resets to zero
71 whenever the major version number changes.
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75 variables, version, text
76Tk 4.1 tkvars(n)