'\"
'\" Copyright (c) 1990 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\" 
'\" RCS: @(#) $Id: SetClass.3,v 1.2 1998/09/14 18:22:53 stanton Exp $
'\" 
'\" The definitions below are for supplemental macros used in Tcl/Tk
'\" manual entries.
'\"
'\" .AP type name in/out ?indent?
'\"	Start paragraph describing an argument to a library procedure.
'\"	type is type of argument (int, etc.), in/out is either "in", "out",
'\"	or "in/out" to describe whether procedure reads or modifies arg,
'\"	and indent is equivalent to second arg of .IP (shouldn't ever be
'\"	needed;  use .AS below instead)
'\"
'\" .AS ?type? ?name?
'\"	Give maximum sizes of arguments for setting tab stops.  Type and
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'\" .BS
'\"	Start box enclosure.  From here until next .BE, everything will be
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'\" .VS ?version? ?br?
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'\" .VE
'\"	End of vertical sidebar.
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'\" .DS
'\"	Begin an indented unfilled display.
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'\" .DE
'\"	End of indented unfilled display.
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'\" .SO
'\"	Start of list of standard options for a Tk widget.  The
'\"	options follow on successive lines, in four columns separated
'\"	by tabs.
'\"
'\" .SE
'\"	End of list of standard options for a Tk widget.
'\"
'\" .OP cmdName dbName dbClass
'\"	Start of description of a specific option.  cmdName gives the
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'\"
'\" .UL arg1 arg2
'\"	Print arg1 underlined, then print arg2 normally.
'\"
'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
'\"
'\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
.if t .wh -1.3i ^B
.nr ^l \n(.l
.ad b
'\"	# Start an argument description
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.ie !"\\$4"" .TP \\$4
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\&\\$1	\\fI\\$2\\fP
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\&\\fI\\$1\\fP
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.nr )A 10n
.if !"\\$1"" .nr )A \\w'\\$1'u+3n
.nr )B \\n()Au+15n
.\"
.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
.nr )C \\n()Bu+\\w'(in/out)'u+2n
..
.AS Tcl_Interp Tcl_CreateInterp in/out
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.\"	box if the box started on an earlier page.
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.\}
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\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
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.LP
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.ft B
..
'\"	# SE - end of list of standard options
.de SE
.fi
.ft R
.LP
See the \\fBoptions\\fR manual entry for details on the standard options.
..
'\"	# OP - start of full description for a single option
.de OP
.LP
.nf
.ta 4c
Command-Line Name:	\\fB\\$1\\fR
Database Name:	\\fB\\$2\\fR
Database Class:	\\fB\\$3\\fR
.fi
.IP
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.de UL
\\$1\l'|0\(ul'\\$2
..
.TH Tk_SetClass 3 "" Tk "Tk Library Procedures"
.BS
.SH NAME
Tk_SetClass, Tk_Class \- set or retrieve a window's class
.SH SYNOPSIS
.nf
\fB#include <tk.h>\fR
.sp
\fBTk_SetClass\fR(\fItkwin, class\fR)
.sp
Tk_Uid
\fBTk_Class\fR(\fItkwin\fR)
.SH ARGUMENTS
.AS Tk_Window parent
.AP Tk_Window tkwin in
Token for window.
.AP char *class in
New class name for window.
.BE

.SH DESCRIPTION
.PP
\fBTk_SetClass\fR is called to associate a class with a particular
window.  The \fIclass\fR string identifies the type of the
window;  all windows with the same general class of behavior
(button, menu, etc.) should have the same class.  By
convention all class names start with a capital letter, and
there exists a Tcl command with the same name as
each class (except all in lower-case) which can be used to
create and manipulate windows of that class.
A window's class string is initialized to NULL
when the window is created.
.PP
For main windows, Tk automatically propagates the name and class
to the WM_CLASS property used by window managers.  This happens
either when a main window is actually created (e.g. in
\fBTk_MakeWindowExist\fR), or when \fBTk_SetClass\fR
is called, whichever occurs later.  If a main window has not been
assigned a class then Tk will not set the WM_CLASS property for
the window.
.PP
\fBTk_Class\fR is a macro that returns the
current value of \fItkwin\fR's class.  The value is returned
as a Tk_Uid, which may be used just like a string pointer but also has
the properties of a unique identifier (see the manual entry for
\fBTk_GetUid\fR for details).
If \fItkwin\fR has not yet been given a class, then
\fBTk_Class\fR will return NULL.

.SH KEYWORDS
class, unique identifier, window, window manager