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- '\" $Header: /user6/ouster/wish/man/RCS/CrtGenHdlr.3,v 1.3 93/04/01 09:41:14 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.
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- .\" .BS
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- .\"
- '\" # Heading for Tcl/Tk man pages
- .de HS
- .ds ^3 \\0
- .if !"\\$3"" .ds ^3 \\$3
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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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- .\".b
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- .el \{\
- .br
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- .nr )A 10n
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- .nr )C \\n()Bu+\\w'(in/out)'u+2n
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- .\}
- .if \\n(^v \{\
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- ..
- .HS Tk_CreateGenericHandler tkc
- .BS
- .SH NAME
- Tk_CreateGenericHandler, Tk_DeleteGenericHandler \- associate procedure callback with all X events
- .SH SYNOPSIS
- .nf
- \fB#include <tk.h>\fR
- .sp
- \fBTk_CreateGenericHandler\fR(\fIproc, clientData\fR)
- .sp
- \fBTk_DeleteGenericHandler\fR(\fIproc, clientData\fR)
- .SH ARGUMENTS
- .AS "Tk_GenericProc" clientData
- .AP Tk_GenericProc *proc in
- Procedure to invoke whenever any X event occurs on any display.
- .AP ClientData clientData in
- Arbitrary one-word value to pass to \fIproc\fR.
- .BE
-
- .SH DESCRIPTION
- .PP
- \fBTk_CreateGenericHandler\fR arranges for \fIproc\fR to be
- invoked in the future whenever any X event occurs. This mechanism is
- \fInot\fR intended for dispatching X events on windows managed by Tk
- (you should use \fBTk_CreateEventHandler\fR for this purpose).
- \fBTk_CreateGenericHandler\fR is intended for other purposes, such
- as tracing X events, monitoring events on windows not owned by Tk,
- accessing X-related libraries that were not originally designed for
- use with Tk, and so on.
- .PP
- The callback to \fIproc\fR will be made by \fBTk_HandleEvent\fR;
- this mechanism only works in programs that dispatch events
- through \fBTk_HandleEvent\fR (or through other Tk procedures that
- call \fBTk_HandleEvent\fR, such as \fBTk_DoOneEvent\fR or
- \fBTk_MainLoop\fR).
- .PP
- \fIProc\fP should have arguments and result that match the
- type \fBTk_GenericProc\fR:
- .nf
- .RS
- typedef int Tk_GenericProc(
- .RS
- ClientData \fIclientData\fR,
- XEvent *\fIeventPtr\fR);
- .RE
- .RE
- .fi
- The \fIclientData\fP parameter to \fIproc\fR is a copy of the \fIclientData\fP
- argument given to \fBTk_CreateGenericHandler\fR when the callback
- was created. Typically, \fIclientData\fR points to a data
- structure containing application-specific information about
- how to handle events.
- \fIEventPtr\fR is a pointer to the X event.
- .PP
- Whenever an X event is processed by \fBTk_HandleEvent\fR, \fIproc\fR
- is called. The return value from \fIproc\fR is normally 0.
- A non-zero return value indicates that the event is not to be handled
- further; that is, \fIproc\fR has done all processing that is to be
- allowed for the event.
- .PP
- If there are multiple generic event handlers, each one is called
- for each event, in the order in which they were established.
- .PP
- \fBTk_DeleteGenericHandler\fR may be called to delete a
- previously-created generic event handler: it deletes each handler
- it finds that matches the \fIproc\fR and \fIclientData\fR arguments. If
- no such handler exists, then \fBTk_DeleteGenericHandler\fR returns
- without doing anything. Although Tk supports it, it's probably
- a bad idea to have more than one callback with the same
- \fIproc\fR and \fIclientData\fR arguments.
- .PP
- Establishing a generic event handler does nothing to ensure that the
- process will actually receive the X events that the handler wants to
- process.
- For example, it is the caller's responsibility to invoke
- \fBXSelectInput\fR to select the desired events, if that is necessary.
- .SH KEYWORDS
- bind, callback, event, handler
-