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2 | '\" Copyright (c) 1990-1994 The Regents of the University of California. | |
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9 | '\" | |
10 | '\" The definitions below are for supplemental macros used in Tcl/Tk | |
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208 | .SH "STANDARD OPTIONS" | |
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219 | See the \\fBoptions\\fR manual entry for details on the standard options. | |
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226 | Command-Line Name: \\fB\\$1\\fR | |
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244 | \\$1\l'|0\(ul'\\$2 | |
245 | .. | |
246 | .TH Tk_CreateSelHandler 3 4.0 Tk "Tk Library Procedures" | |
247 | .BS | |
248 | .SH NAME | |
249 | Tk_CreateSelHandler, Tk_DeleteSelHandler \- arrange to handle requests for a selection | |
250 | .SH SYNOPSIS | |
251 | .nf | |
252 | \fB#include <tk.h>\fR | |
253 | .sp | |
254 | \fBTk_CreateSelHandler\fR(\fItkwin, selection, target, proc, clientData, format\fR) | |
255 | .sp | |
256 | \fBTk_DeleteSelHandler\fR(\fItkwin, selection, target\fR) | |
257 | .SH ARGUMENTS | |
258 | .AS Tk_SelectionProc clientData | |
259 | .AP Tk_Window tkwin in | |
260 | Window for which \fIproc\fR will provide selection information. | |
261 | .AP Atom selection in | |
262 | The name of the selection for which \fIproc\fR will provide | |
263 | selection information. | |
264 | .AP Atom target in | |
265 | Form in which \fIproc\fR can provide the selection (e.g. STRING | |
266 | or FILE_NAME). Corresponds to \fItype\fR arguments in \fBselection\fR | |
267 | commands. | |
268 | .AP Tk_SelectionProc *proc in | |
269 | Procedure to invoke whenever the selection is owned by \fItkwin\fR | |
270 | and the selection contents are requested in the format given by | |
271 | \fItarget\fR. | |
272 | .AP ClientData clientData in | |
273 | Arbitrary one-word value to pass to \fIproc\fR. | |
274 | .AP Atom format in | |
275 | If the selection requestor isn't in this process, \fIformat\fR determines | |
276 | the representation used to transmit the selection to its | |
277 | requestor. | |
278 | .BE | |
279 | ||
280 | .SH DESCRIPTION | |
281 | .PP | |
282 | \fBTk_CreateSelHandler\fR arranges for a particular procedure | |
283 | (\fIproc\fR) to be called whenever \fIselection\fR is owned by | |
284 | \fItkwin\fR and the selection contents are requested in the | |
285 | form given by \fItarget\fR. | |
286 | \fITarget\fR should be one of | |
287 | the entries defined in the left column of Table 2 of the | |
288 | X Inter-Client Communication Conventions Manual (ICCCM) or | |
289 | any other form in which an application is willing to present | |
290 | the selection. The most common form is STRING. | |
291 | .PP | |
292 | \fIProc\fR should have arguments and result that match the | |
293 | type \fBTk_SelectionProc\fR: | |
294 | .CS | |
295 | typedef int Tk_SelectionProc( | |
296 | ClientData \fIclientData\fR, | |
297 | int \fIoffset\fR, | |
298 | char *\fIbuffer\fR, | |
299 | int \fImaxBytes\fR); | |
300 | .CE | |
301 | The \fIclientData\fR parameter to \fIproc\fR is a copy of the | |
302 | \fIclientData\fR argument given to \fBTk_CreateSelHandler\fR. | |
303 | Typically, \fIclientData\fR points to a data | |
304 | structure containing application-specific information that is | |
305 | needed to retrieve the selection. \fIOffset\fR specifies an | |
306 | offset position into the selection, \fIbuffer\fR specifies a | |
307 | location at which to copy information about the selection, and | |
308 | \fImaxBytes\fR specifies the amount of space available at | |
309 | \fIbuffer\fR. \fIProc\fR should place a NULL-terminated string | |
310 | at \fIbuffer\fR containing \fImaxBytes\fR or fewer characters | |
311 | (not including the terminating NULL), and it should return a | |
312 | count of the number of non-NULL characters stored at | |
313 | \fIbuffer\fR. If the selection no longer exists (e.g. it once | |
314 | existed but the user deleted the range of characters containing | |
315 | it), then \fIproc\fR should return -1. | |
316 | .PP | |
317 | When transferring large selections, Tk will break them up into | |
318 | smaller pieces (typically a few thousand bytes each) for more | |
319 | efficient transmission. It will do this by calling \fIproc\fR | |
320 | one or more times, using successively higher values of \fIoffset\fR | |
321 | to retrieve successive portions of the selection. If \fIproc\fR | |
322 | returns a count less than \fImaxBytes\fR it means that the entire | |
323 | remainder of the selection has been returned. If \fIproc\fR's return | |
324 | value is \fImaxBytes\fR it means there may be additional information | |
325 | in the selection, so Tk must make another call to \fIproc\fR to | |
326 | retrieve the next portion. | |
327 | .PP | |
328 | \fIProc\fR always returns selection information in the form of a | |
329 | character string. However, the ICCCM allows for information to | |
330 | be transmitted from the selection owner to the selection requestor | |
331 | in any of several formats, such as a string, an array of atoms, an | |
332 | array of integers, etc. The \fIformat\fR argument to | |
333 | \fBTk_CreateSelHandler\fR indicates what format should be used to | |
334 | transmit the selection to its requestor (see the middle column of | |
335 | Table 2 of the ICCCM for examples). If \fIformat\fR is not | |
336 | STRING, then Tk will take the value returned by \fIproc\fR and divided | |
337 | it into fields separated by white space. If \fIformat\fR is ATOM, | |
338 | then Tk will return the selection as an array of atoms, with each | |
339 | field in \fIproc\fR's result treated as the name of one atom. For | |
340 | any other value of \fIformat\fR, Tk will return the selection as an | |
341 | array of 32-bit values where each field of \fIproc\fR's result is | |
342 | treated as a number and translated to a 32-bit value. In any event, | |
343 | the \fIformat\fR atom is returned to the selection requestor along | |
344 | with the contents of the selection. | |
345 | .PP | |
346 | If \fBTk_CreateSelHandler\fR is called when there already exists a | |
347 | handler for \fIselection\fR and \fItarget\fR on \fItkwin\fR, then the | |
348 | existing handler is replaced with a new one. | |
349 | .PP | |
350 | \fBTk_DeleteSelHandler\fR removes the handler given by \fItkwin\fR, | |
351 | \fIselection\fR, and \fItarget\fR, if such a handler exists. | |
352 | If there is no such handler then it has no effect. | |
353 | ||
354 | .SH KEYWORDS | |
355 | format, handler, selection, target |