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1 | '\" |
2 | '\" Copyright (c) 2000 Ajuba Solutions. | |
3 | '\" | |
4 | '\" See the file "license.terms" for information on usage and redistribution | |
5 | '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. | |
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7 | '\" RCS: @(#) $Id: CrtCmHdlr.3,v 1.1 2000/06/03 08:57:34 hobbs Exp $ | |
8 | '\" | |
9 | '\" The definitions below are for supplemental macros used in Tcl/Tk | |
10 | '\" manual entries. | |
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70 | '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $ | |
71 | '\" | |
72 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. | |
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205 | '\" # SO - start of list of standard options | |
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207 | .SH "STANDARD OPTIONS" | |
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210 | .ta 5.5c 11c | |
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213 | '\" # SE - end of list of standard options | |
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218 | See the \\fBoptions\\fR manual entry for details on the standard options. | |
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220 | '\" # OP - start of full description for a single option | |
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225 | Command-Line Name: \\fB\\$1\\fR | |
226 | Database Name: \\fB\\$2\\fR | |
227 | Database Class: \\fB\\$3\\fR | |
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243 | \\$1\l'|0\(ul'\\$2 | |
244 | .. | |
245 | .TH Tk_CreateClientMessageHandler 3 "8.4" Tk "Tk Library Procedures" | |
246 | .BS | |
247 | .SH NAME | |
248 | Tk_CreateClientMessageHandler, Tk_DeleteClientMessageHandler \- associate procedure callback with ClientMessage type X events | |
249 | .SH SYNOPSIS | |
250 | .nf | |
251 | \fB#include <tk.h>\fR | |
252 | .sp | |
253 | \fBTk_CreateClientMessageHandler\fR(\fIproc\fR) | |
254 | .sp | |
255 | \fBTk_DeleteClientMessageHandler\fR(\fIproc\fR) | |
256 | .SH ARGUMENTS | |
257 | .AP Tk_ClientMessageProc *proc in | |
258 | Procedure to invoke whenever a ClientMessage X event occurs on any display. | |
259 | .BE | |
260 | ||
261 | .SH DESCRIPTION | |
262 | .PP | |
263 | ||
264 | \fBTk_CreateClientMessageHandler\fR arranges for \fIproc\fR to be invoked | |
265 | in the future whenever a ClientMessage X event occurs that isn't handled by | |
266 | \fBWM_PROTOCOL\fR. \fBTk_CreateClientMessageHandler\fR is intended for use | |
267 | by applications which need to watch X ClientMessage events, such as drag and | |
268 | drop applications. | |
269 | .PP | |
270 | The callback to \fIproc\fR will be made by \fBTk_HandleEvent\fR; | |
271 | this mechanism only works in programs that dispatch events | |
272 | through \fBTk_HandleEvent\fR (or through other Tk procedures that | |
273 | call \fBTk_HandleEvent\fR, such as \fBTk_DoOneEvent\fR or | |
274 | \fBTk_MainLoop\fR). | |
275 | .PP | |
276 | \fIProc\fR should have arguments and result that match the | |
277 | type \fBTk_ClientMessageProc\fR: | |
278 | .CS | |
279 | typedef int Tk_ClientMessageProc( | |
280 | Tk_Window \fItkwin\fR, | |
281 | XEvent *\fIeventPtr\fR); | |
282 | .CE | |
283 | The \fItkwin\fR parameter to \fIproc\fR is the Tk window which is | |
284 | associated with this event. \fIEventPtr\fR is a pointer to the X event. | |
285 | .PP | |
286 | Whenever an X ClientMessage event is processed by \fBTk_HandleEvent\fR, | |
287 | the \fIproc\fR is called if it wasn't handled as a \fBWM_PROTOCOL\fR. | |
288 | The return value from \fIproc\fR is normally 0. | |
289 | A non-zero return value indicates that the event is not to be handled | |
290 | further; that is, \fIproc\fR has done all processing that is to be | |
291 | allowed for the event. | |
292 | .PP | |
293 | If there are multiple ClientMessage event handlers, each one is called | |
294 | for each event, in the order in which they were established. | |
295 | .PP | |
296 | \fBTk_DeleteClientMessageHandler\fR may be called to delete a | |
297 | previously-created ClientMessage event handler: it deletes each handler it | |
298 | finds that matches the \fIproc\fR argument. If no such handler exists, | |
299 | then \fBTk_DeleteClientMessageHandler\fR returns without doing anything. | |
300 | Although Tk supports it, it's probably a bad idea to have more than one | |
301 | callback with the same \fIproc\fR argument. | |
302 | ||
303 | .SH KEYWORDS | |
304 | bind, callback, event, handler |