61 lines
3.1 KiB
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61 lines
3.1 KiB
HTML
<HTML><HEAD><TITLE>Tk Built-In Commands - tkvars manual page</TITLE></HEAD><BODY>
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<H3><A NAME="M2">NAME</A></H3>
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tkvars - Variables used or set by Tk
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<H3><A NAME="M3">DESCRIPTION</A></H3>
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The following Tcl variables are either set or used by Tk at various times
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in its execution:
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<P>
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<DL>
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<P><DT><A NAME="M4"><B>tk_library</B></A><DD>
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This variable holds the file name for a directory containing a library
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of Tcl scripts related to Tk. These scripts include an initialization
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file that is normally processed whenever a Tk application starts up,
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plus other files containing procedures that implement default behaviors
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for widgets.
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The initial value of <B>tcl_library</B> is set when Tk is added to
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an interpreter; this is done by searching several different directories
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until one is found that contains an appropriate Tk startup script.
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If the <B>TK_LIBRARY</B> environment variable exists, then
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the directory it names is checked first.
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If <B>TK_LIBRARY</B> isn't set or doesn't refer to an appropriate
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directory, then Tk checks several other directories based on a
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compiled-in default location, the location of the Tcl library directory,
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the location of the binary containing the application, and the current
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working directory.
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The variable can be modified by an application to switch to a different
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library.
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<P><DT><A NAME="M5"><B>tk_patchLevel</B></A><DD>
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Contains a decimal integer giving the current patch level for Tk.
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The patch level is incremented for each new release or patch, and
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it uniquely identifies an official version of Tk.
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<P><DT><A NAME="M6"><B>tkPriv</B></A><DD>
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This variable is an array containing several pieces of information
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that are private to Tk. The elements of <B>tkPriv</B> are used by
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Tk library procedures and default bindings.
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They should not be accessed by any code outside Tk.
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<P><DT><A NAME="M7"><B>tk_strictMotif</B></A><DD>
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This variable is set to zero by default.
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If an application sets it to one, then Tk attempts to adhere as
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closely as possible to Motif look-and-feel standards.
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For example, active elements such as buttons and scrollbar
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sliders will not change color when the pointer passes over them.
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<P><DT><A NAME="M8"><B>tk_version</B></A><DD>
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Tk sets this variable in the interpreter for each application.
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The variable holds the current version number of the Tk
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library in the form <I>major</I>.<I>minor</I>. <I>Major</I> and
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<I>minor</I> are integers. The major version number increases in
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any Tk release that includes changes that are not backward compatible
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(i.e. whenever existing Tk applications and scripts may have to change to
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work with the new release). The minor version number increases with
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each new release of Tk, except that it resets to zero whenever the
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major version number changes.
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<P></DL>
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<H3><A NAME="M9">KEYWORDS</A></H3>
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<A href="../Keywords/V.htm#variables">variables</A>, <A href="../Keywords/V.htm#version">version</A>
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<HR><PRE>
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<A HREF="../copyright.htm">Copyright</A> © 1990-1994 The Regents of the University of California.
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<A HREF="../copyright.htm">Copyright</A> © 1994-1996 Sun Microsystems, Inc.
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<A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE>
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</BODY></HTML>
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