diff options
author | dkf <donal.k.fellows@manchester.ac.uk> | 2007-10-28 14:17:38 (GMT) |
---|---|---|
committer | dkf <donal.k.fellows@manchester.ac.uk> | 2007-10-28 14:17:38 (GMT) |
commit | ccacc920f9cd610a9a9d8e800f623c20bf43a702 (patch) | |
tree | daec40c266097bb1d38f10254010691b0131d4cc /doc/DoOneEvent.3 | |
parent | 8ffb8fa76d0d34283e491044dd28385674ba113e (diff) | |
download | tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.zip tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.tar.gz tcl-ccacc920f9cd610a9a9d8e800f623c20bf43a702.tar.bz2 |
First stage of doing GOOBE improvements to documentation now that the html generation works
Diffstat (limited to 'doc/DoOneEvent.3')
-rw-r--r-- | doc/DoOneEvent.3 | 216 |
1 files changed, 108 insertions, 108 deletions
diff --git a/doc/DoOneEvent.3 b/doc/DoOneEvent.3 index dc3d6e6..a027c80 100644 --- a/doc/DoOneEvent.3 +++ b/doc/DoOneEvent.3 @@ -1,108 +1,108 @@ -'\" -'\" Copyright (c) 1990-1992 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: DoOneEvent.3,v 1.3 2004/09/18 17:01:05 dkf Exp $ -'\" -.so man.macros -.TH Tcl_DoOneEvent 3 7.5 Tcl "Tcl Library Procedures" -.BS -.SH NAME -Tcl_DoOneEvent \- wait for events and invoke event handlers -.SH SYNOPSIS -.nf -\fB#include <tcl.h>\fR -.sp -int -\fBTcl_DoOneEvent\fR(\fIflags\fR) -.SH ARGUMENTS -.AS int flags -.AP int flags in -This parameter is normally zero. It may be an OR-ed combination -of any of the following flag bits: -\fBTCL_WINDOW_EVENTS\fR, \fBTCL_FILE_EVENTS\fR, -\fBTCL_TIMER_EVENTS\fR, \fBTCL_IDLE_EVENTS\fR, \fBTCL_ALL_EVENTS\fR, -or \fBTCL_DONT_WAIT\fR. -.BE - -.SH DESCRIPTION -.PP -This procedure is the entry point to Tcl's event loop; it is responsible for -waiting for events and dispatching event handlers created with -procedures such as \fBTk_CreateEventHandler\fR, \fBTcl_CreateFileHandler\fR, -\fBTcl_CreateTimerHandler\fR, and \fBTcl_DoWhenIdle\fR. -\fBTcl_DoOneEvent\fR checks to see if -events are already present on the Tcl event queue; if so, -it calls the handler(s) for the first (oldest) event, removes it from -the queue, and returns. -If there are no events ready to be handled, then \fBTcl_DoOneEvent\fR -checks for new events from all possible sources. -If any are found, it puts all of them on Tcl's event queue, calls -handlers for the first event on the queue, and returns. -If no events are found, \fBTcl_DoOneEvent\fR checks for \fBTcl_DoWhenIdle\fR -callbacks; if any are found, it invokes all of them and returns. -Finally, if no events or idle callbacks have been found, then -\fBTcl_DoOneEvent\fR sleeps until an event occurs; then it adds any -new events to the Tcl event queue, calls handlers for the first event, -and returns. -The normal return value is 1 to signify that some event -was processed (see below for other alternatives). -.PP -If the \fIflags\fR argument to \fBTcl_DoOneEvent\fR is non-zero, -it restricts the kinds of events that will be processed by -\fBTcl_DoOneEvent\fR. -\fIFlags\fR may be an OR-ed combination of any of the following bits: -.TP 27 -\fBTCL_WINDOW_EVENTS\fR \- -Process window system events. -.TP 27 -\fBTCL_FILE_EVENTS\fR \- -Process file events. -.TP 27 -\fBTCL_TIMER_EVENTS\fR \- -Process timer events. -.TP 27 -\fBTCL_IDLE_EVENTS\fR \- -Process idle callbacks. -.TP 27 -\fBTCL_ALL_EVENTS\fR \- -Process all kinds of events: equivalent to OR-ing together all of the -above flags or specifying none of them. -.TP 27 -\fBTCL_DONT_WAIT\fR \- -Don't sleep: process only events that are ready at the time of the -call. -.LP -If any of the flags \fBTCL_WINDOW_EVENTS\fR, \fBTCL_FILE_EVENTS\fR, -\fBTCL_TIMER_EVENTS\fR, or \fBTCL_IDLE_EVENTS\fR is set, then the only -events that will be considered are those for which flags are set. -Setting none of these flags is equivalent to the value -\fBTCL_ALL_EVENTS\fR, which causes all event types to be processed. -If an application has defined additional event sources with -\fBTcl_CreateEventSource\fR, then additional \fIflag\fR values -may also be valid, depending on those event sources. -.PP -The \fBTCL_DONT_WAIT\fR flag causes \fBTcl_DoOneEvent\fR not to put -the process to sleep: it will check for events but if none are found -then it returns immediately with a return value of 0 to indicate -that no work was done. -\fBTcl_DoOneEvent\fR will also return 0 without doing anything if -the only alternative is to block forever (this can happen, for example, -if \fIflags\fR is \fBTCL_IDLE_EVENTS\fR and there are no -\fBTcl_DoWhenIdle\fR callbacks pending, or if no event handlers or -timer handlers exist). -.PP -\fBTcl_DoOneEvent\fR may be invoked recursively. For example, -it is possible to invoke \fBTcl_DoOneEvent\fR recursively -from a handler called by \fBTcl_DoOneEvent\fR. This sort -of operation is useful in some modal situations, such -as when a -notification dialog has been popped up and an application wishes to -wait for the user to click a button in the dialog before -doing anything else. - -.SH KEYWORDS -callback, event, handler, idle, timer +'\"
+'\" Copyright (c) 1990-1992 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: DoOneEvent.3,v 1.4 2007/10/28 14:17:38 dkf Exp $
+'\"
+.so man.macros
+.TH Tcl_DoOneEvent 3 7.5 Tcl "Tcl Library Procedures"
+.BS
+.SH NAME
+Tcl_DoOneEvent \- wait for events and invoke event handlers
+.SH SYNOPSIS
+.nf
+\fB#include <tcl.h>\fR
+.sp
+int
+\fBTcl_DoOneEvent\fR(\fIflags\fR)
+.SH ARGUMENTS
+.AS int flags
+.AP int flags in
+This parameter is normally zero. It may be an OR-ed combination
+of any of the following flag bits:
+\fBTCL_WINDOW_EVENTS\fR, \fBTCL_FILE_EVENTS\fR,
+\fBTCL_TIMER_EVENTS\fR, \fBTCL_IDLE_EVENTS\fR, \fBTCL_ALL_EVENTS\fR,
+or \fBTCL_DONT_WAIT\fR.
+.BE
+
+.SH DESCRIPTION
+.PP
+This procedure is the entry point to Tcl's event loop; it is responsible for
+waiting for events and dispatching event handlers created with
+procedures such as \fBTk_CreateEventHandler\fR, \fBTcl_CreateFileHandler\fR,
+\fBTcl_CreateTimerHandler\fR, and \fBTcl_DoWhenIdle\fR.
+\fBTcl_DoOneEvent\fR checks to see if
+events are already present on the Tcl event queue; if so,
+it calls the handler(s) for the first (oldest) event, removes it from
+the queue, and returns.
+If there are no events ready to be handled, then \fBTcl_DoOneEvent\fR
+checks for new events from all possible sources.
+If any are found, it puts all of them on Tcl's event queue, calls
+handlers for the first event on the queue, and returns.
+If no events are found, \fBTcl_DoOneEvent\fR checks for \fBTcl_DoWhenIdle\fR
+callbacks; if any are found, it invokes all of them and returns.
+Finally, if no events or idle callbacks have been found, then
+\fBTcl_DoOneEvent\fR sleeps until an event occurs; then it adds any
+new events to the Tcl event queue, calls handlers for the first event,
+and returns.
+The normal return value is 1 to signify that some event
+was processed (see below for other alternatives).
+.PP
+If the \fIflags\fR argument to \fBTcl_DoOneEvent\fR is non-zero,
+it restricts the kinds of events that will be processed by
+\fBTcl_DoOneEvent\fR.
+\fIFlags\fR may be an OR-ed combination of any of the following bits:
+.TP 27
+\fBTCL_WINDOW_EVENTS\fR \-
+Process window system events.
+.TP 27
+\fBTCL_FILE_EVENTS\fR \-
+Process file events.
+.TP 27
+\fBTCL_TIMER_EVENTS\fR \-
+Process timer events.
+.TP 27
+\fBTCL_IDLE_EVENTS\fR \-
+Process idle callbacks.
+.TP 27
+\fBTCL_ALL_EVENTS\fR \-
+Process all kinds of events: equivalent to OR-ing together all of the
+above flags or specifying none of them.
+.TP 27
+\fBTCL_DONT_WAIT\fR \-
+Do not sleep: process only events that are ready at the time of the
+call.
+.LP
+If any of the flags \fBTCL_WINDOW_EVENTS\fR, \fBTCL_FILE_EVENTS\fR,
+\fBTCL_TIMER_EVENTS\fR, or \fBTCL_IDLE_EVENTS\fR is set, then the only
+events that will be considered are those for which flags are set.
+Setting none of these flags is equivalent to the value
+\fBTCL_ALL_EVENTS\fR, which causes all event types to be processed.
+If an application has defined additional event sources with
+\fBTcl_CreateEventSource\fR, then additional \fIflag\fR values
+may also be valid, depending on those event sources.
+.PP
+The \fBTCL_DONT_WAIT\fR flag causes \fBTcl_DoOneEvent\fR not to put
+the process to sleep: it will check for events but if none are found
+then it returns immediately with a return value of 0 to indicate
+that no work was done.
+\fBTcl_DoOneEvent\fR will also return 0 without doing anything if
+the only alternative is to block forever (this can happen, for example,
+if \fIflags\fR is \fBTCL_IDLE_EVENTS\fR and there are no
+\fBTcl_DoWhenIdle\fR callbacks pending, or if no event handlers or
+timer handlers exist).
+.PP
+\fBTcl_DoOneEvent\fR may be invoked recursively. For example,
+it is possible to invoke \fBTcl_DoOneEvent\fR recursively
+from a handler called by \fBTcl_DoOneEvent\fR. This sort
+of operation is useful in some modal situations, such
+as when a
+notification dialog has been popped up and an application wishes to
+wait for the user to click a button in the dialog before
+doing anything else.
+
+.SH KEYWORDS
+callback, event, handler, idle, timer
|