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- '\"
- '\" Copyright (c) 1990 The Regents of the University of California.
- '\" All rights reserved.
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- '\" Permission is hereby granted, without written agreement and without
- '\" license or royalty fees, to use, copy, modify, and distribute this
- '\" documentation for any purpose, provided that the above copyright
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- '\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
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- '\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
- '\" CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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- '\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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- '\"
- '\" $Header: /user6/ouster/wish/man/RCS/TimerHndlr.3,v 1.6 93/04/01 09:41:59 ouster Exp $ SPRITE (Berkeley)
- '\"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
- .\" manual entries.
- .\"
- .\" .HS name section [date [version]]
- .\" Replacement for .TH in other man pages. See below for valid
- .\" section names.
- .\"
- .\" .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
- .\" name are examples of largest possible arguments that will be passed
- .\" to .AP later. If args are omitted, default tab stops are used.
- .\"
- .\" .BS
- .\" Start box enclosure. From here until next .BE, everything will be
- .\" enclosed in one large box.
- .\"
- .\" .BE
- .\" End of box enclosure.
- .\"
- .\" .VS
- .\" Begin vertical sidebar, for use in marking newly-changed parts
- .\" of man pages.
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- .\"
- .\" .DS
- .\" Begin an indented unfilled display.
- .\"
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- .\" End of indented unfilled display.
- .\"
- '\" # Heading for Tcl/Tk man pages
- .de HS
- .ds ^3 \\0
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- .if '\\$2'tkcmds' .TH \\$1 1 \\*(^3 Tk "Tk Applications"
- .if t .wh -1.3i ^B
- .nr ^l \\n(.l
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- ..
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- .ta \\n()Au \\n()Bu
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- .\".b
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- .el \{\
- .br
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- \&\\$1 \\fI\\$2\\fP
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- ..
- '\" # define tabbing values for .AP
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- .nr )A 10n
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- .\"
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- ..
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- .nr ^b 0
- ..
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- '\" # ^Y = starting y location
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- .el .nr ^v 1u
- ..
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- 'ti 0
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- ..
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- ..
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- .sp .5
- ..
- .HS Tk_CreateTimerHandler tkc
- .BS
- .SH NAME
- Tk_CreateTimerHandler, Tk_DeleteTimerHandler \- call a procedure at a
- given time
- .SH SYNOPSIS
- .nf
- \fB#include <tk.h>\fR
- .sp
- Tk_TimerToken
- \fBTk_CreateTimerHandler\fR(\fImilliseconds, proc, clientData\fR)
- .sp
- \fBTk_DeleteTimerHandler\fR(\fItoken\fR)
- .SH ARGUMENTS
- .AS Tk_TimerToken milliseconds
- .AP int milliseconds in
- How many milliseconds to wait before invoking \fIproc\fR.
- .AP Tk_TimerProc *proc in
- Procedure to invoke after \fImilliseconds\fR have elapsed.
- .AP ClientData clientData in
- Arbitrary one-word value to pass to \fIproc\fR.
- .AP Tk_TimerToken token in
- Token for previously-created timer handler (the return value
- from some previous call to \fBTk_CreateTimerHandler).
- .BE
-
- .SH DESCRIPTION
- .PP
- \fBTk_CreateTimerHandler\fR arranges for \fIproc\fR to be
- invoked at a time \fImilliseconds\fR milliseconds in the
- future.
- The callback to \fIproc\fR will be made by \fBTk_DoOneEvent\fR,
- so \fBTk_CreateTimerHandler\fR is only useful in
- programs that dispatch events
- through \fBTk_DoOneEvent\fR or through other Tk procedures that
- call \fBTk_DoOneEvent\fR, such as \fBTk_MainLoop\fR. The call
- to \fIproc\fR may not be made at the exact time given by
- \fImilliseconds\fR: it will be made at the next opportunity
- after that time. For example, if \fBTk_DoOneEvent\fR isn't
- called until long after the time has elapsed, or if there
- are other pending events to process before the call to
- \fIproc\fR, then the call to \fIproc\fR will be delayed.
- .PP
- \fIProc\fP should have arguments and return value that match
- the type \fBTk_TimerProc\fR:
- .nf
- .RS
- typedef void Tk_TimerProc(ClientData \fIclientData\fR);
- .RE
- .fi
- The \fIclientData\fP parameter to \fIproc\fR is a
- copy of the \fIclientData\fP argument given to
- \fBTcl_CreateTimerHandler\fR when the callback
- was created. Typically, \fIclientData\fR points to a data
- structure containing application-specific information about
- what to do in \fIproc\fR.
- .PP
- \fBTk_DeleteTimerHandler\fR may be called to delete a
- previously-created timer handler. It deletes the handler
- indicated by \fItoken\fR so that no call to \fIproc\fR
- will be made; if that handler no longer exists
- (e.g. because the time period has already elapsed and \fIproc\fR
- has been invoked) then \fBTk_DeleteTimerHandler\fR does nothing.
-
- .SH KEYWORDS
- callback, clock, handler, timer
-