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1 | '\" |
2 | '\" Copyright (c) 1990 The Regents of the University of California. | |
3 | '\" Copyright (c) 1994-1996 Sun Microsystems, Inc. | |
4 | '\" | |
5 | '\" See the file "license.terms" for information on usage and redistribution | |
6 | '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. | |
7 | '\" | |
8 | '\" RCS: @(#) $Id: RestrictEv.3,v 1.2 1998/09/14 18:22:53 stanton Exp $ | |
9 | '\" | |
10 | '\" The definitions below are for supplemental macros used in Tcl/Tk | |
11 | '\" manual entries. | |
12 | '\" | |
13 | '\" .AP type name in/out ?indent? | |
14 | '\" Start paragraph describing an argument to a library procedure. | |
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20 | '\" .AS ?type? ?name? | |
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38 | '\" .VS ?version? ?br? | |
39 | '\" Begin vertical sidebar, for use in marking newly-changed parts | |
40 | '\" of man pages. The first argument is ignored and used for recording | |
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62 | '\" .OP cmdName dbName dbClass | |
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71 | '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $ | |
72 | '\" | |
73 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. | |
74 | .if t .wh -1.3i ^B | |
75 | .nr ^l \n(.l | |
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77 | '\" # Start an argument description | |
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108 | .AS Tcl_Interp Tcl_CreateInterp in/out | |
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134 | \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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158 | \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n' | |
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176 | .ie !\\n(^b-1 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c | |
177 | .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c | |
178 | .\} | |
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181 | \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c | |
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205 | .. | |
206 | '\" # SO - start of list of standard options | |
207 | .de SO | |
208 | .SH "STANDARD OPTIONS" | |
209 | .LP | |
210 | .nf | |
211 | .ta 5.5c 11c | |
212 | .ft B | |
213 | .. | |
214 | '\" # SE - end of list of standard options | |
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217 | .ft R | |
218 | .LP | |
219 | See the \\fBoptions\\fR manual entry for details on the standard options. | |
220 | .. | |
221 | '\" # OP - start of full description for a single option | |
222 | .de OP | |
223 | .LP | |
224 | .nf | |
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226 | Command-Line Name: \\fB\\$1\\fR | |
227 | Database Name: \\fB\\$2\\fR | |
228 | Database Class: \\fB\\$3\\fR | |
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230 | .IP | |
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244 | \\$1\l'|0\(ul'\\$2 | |
245 | .. | |
246 | .TH Tk_RestrictEvents 3 "" Tk "Tk Library Procedures" | |
247 | .BS | |
248 | .SH NAME | |
249 | Tk_RestrictEvents \- filter and selectively delay X events | |
250 | .SH SYNOPSIS | |
251 | .nf | |
252 | \fB#include <tk.h>\fR | |
253 | .sp | |
254 | Tk_RestrictProc * | |
255 | \fBTk_RestrictEvents\fR(\fIproc, clientData, prevClientDataPtr\fR) | |
256 | .SH ARGUMENTS | |
257 | .AS Tk_RestrictProc **prevClientDataPtr | |
258 | .AP Tk_RestrictProc *proc in | |
259 | Predicate procedure to call to filter incoming X events. | |
260 | NULL means do not restrict events at all. | |
261 | .AP ClientData clientData in | |
262 | Arbitrary argument to pass to \fIproc\fR. | |
263 | .AP ClientData *prevClientDataPtr out | |
264 | Pointer to place to save argument to previous restrict procedure. | |
265 | .BE | |
266 | ||
267 | .SH DESCRIPTION | |
268 | .PP | |
269 | This procedure is useful in certain situations where applications | |
270 | are only prepared to receive certain X events. After | |
271 | \fBTk_RestrictEvents\fR is called, \fBTk_DoOneEvent\fR (and | |
272 | hence \fBTk_MainLoop\fR) will filter X input events through | |
273 | \fIproc\fR. \fIProc\fR indicates whether a | |
274 | given event is to be processed immediately, deferred until some | |
275 | later time (e.g. when the event restriction is lifted), or discarded. | |
276 | \fIProc\fR | |
277 | is a procedure with arguments and result that match | |
278 | the type \fBTk_RestrictProc\fR: | |
279 | .CS | |
280 | typedef Tk_RestrictAction Tk_RestrictProc( | |
281 | ClientData \fIclientData\fR, | |
282 | XEvent *\fIeventPtr\fR); | |
283 | .CE | |
284 | The \fIclientData\fR argument is a copy of the \fIclientData\fR passed | |
285 | to \fBTk_RestrictEvents\fR; it may be used to provide \fIproc\fR with | |
286 | information it needs to filter events. The \fIeventPtr\fR points to | |
287 | an event under consideration. \fIProc\fR returns a restrict action | |
288 | (enumerated type \fBTk_RestrictAction\fR) that indicates what | |
289 | \fBTk_DoOneEvent\fR should do with the event. If the return value is | |
290 | \fBTK_PROCESS_EVENT\fR, then the event will be handled immediately. | |
291 | If the return value is \fBTK_DEFER_EVENT\fR, then the event will be | |
292 | left on the event queue for later processing. If the return value is | |
293 | \fBTK_DISCARD_EVENT\fR, then the event will be removed from the event | |
294 | queue and discarded without being processed. | |
295 | .PP | |
296 | \fBTk_RestrictEvents\fR uses its return value and \fIprevClientDataPtr\fR | |
297 | to return information about the current event restriction procedure | |
298 | (a NULL return value means there are currently no restrictions). | |
299 | These values may be used to restore the previous restriction state | |
300 | when there is no longer any need for the current restriction. | |
301 | .PP | |
302 | There are very few places where \fBTk_RestrictEvents\fR is needed. | |
303 | In most cases, the best way to restrict events is by changing the | |
304 | bindings with the \fBbind\fR Tcl command or by calling | |
305 | \fBTk_CreateEventHandler\fR and \fBTk_DeleteEventHandler\fR from C. | |
306 | The main place where \fBTk_RestrictEvents\fR must be used is when | |
307 | performing synchronous actions (for example, if you need to wait | |
308 | for a particular event to occur on a particular window but you don't | |
309 | want to invoke any handlers for any other events). The ``obvious'' | |
310 | solution in these situations is to call \fBXNextEvent\fR or | |
311 | \fBXWindowEvent\fR, but these procedures cannot be used because | |
312 | Tk keeps its own event queue that is separate from the X event | |
313 | queue. Instead, call \fBTk_RestrictEvents\fR to set up a filter, | |
314 | then call \fBTk_DoOneEvent\fR to retrieve the desired event(s). | |
315 | .SH KEYWORDS | |
316 | delay, event, filter, restriction |