| 1 | '\" |
| 2 | '\" Copyright (c) 1994 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: GetScroll.3,v 1.5 2002/08/05 04:30:38 dgp Exp $ |
| 9 | '\" |
| 10 | '\" The definitions below are for supplemental macros used in Tcl/Tk |
| 11 | '\" manual entries. |
| 12 | '\" |
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| 73 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. |
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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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| 245 | .. |
| 246 | .TH Tk_GetScrollInfo 3 8.0 Tk "Tk Library Procedures" |
| 247 | .BS |
| 248 | .SH NAME |
| 249 | Tk_GetScrollInfo, Tk_GetScrollInfoObj \- parse arguments for scrolling commands |
| 250 | .SH SYNOPSIS |
| 251 | .nf |
| 252 | \fB#include <tk.h>\fR |
| 253 | .sp |
| 254 | int |
| 255 | \fBTk_GetScrollInfo(\fIinterp, argc, argv, dblPtr, intPtr\fB)\fR |
| 256 | .sp |
| 257 | int |
| 258 | \fBTk_GetScrollInfoObj(\fIinterp, objc, objv, dblPtr, intPtr\fB)\fR |
| 259 | .SH ARGUMENTS |
| 260 | .AS "Tcl_Interp" *dblPtr |
| 261 | .AP Tcl_Interp *interp in |
| 262 | Interpreter to use for error reporting. |
| 263 | .AP int argc in |
| 264 | Number of strings in \fIargv\fR array. |
| 265 | .AP "CONST char" *argv[] in |
| 266 | Argument strings. These represent the entire widget command, of |
| 267 | which the first word is typically the widget name and the second |
| 268 | word is typically \fBxview\fR or \fByview\fR. |
| 269 | .AP int objc in |
| 270 | Number of Tcl_Obj's in \fIobjv\fR array. |
| 271 | .AP "Tcl_Obj *CONST" objv[] in |
| 272 | Argument objects. These represent the entire widget command, of |
| 273 | which the first word is typically the widget name and the second |
| 274 | word is typically \fBxview\fR or \fByview\fR. |
| 275 | .AP double *dblPtr out |
| 276 | Filled in with fraction from \fBmoveto\fR option, if any. |
| 277 | .AP int *intPtr out |
| 278 | Filled in with line or page count from \fBscroll\fR option, if any. |
| 279 | The value may be negative. |
| 280 | .BE |
| 281 | |
| 282 | .SH DESCRIPTION |
| 283 | .PP |
| 284 | \fBTk_GetScrollInfo\fR parses the arguments expected by widget |
| 285 | scrolling commands such as \fBxview\fR and \fByview\fR. |
| 286 | It receives the entire list of words that make up a widget command |
| 287 | and parses the words starting with \fIargv\fR[2]. |
| 288 | The words starting with \fIargv\fR[2] must have one of the following forms: |
| 289 | .CS |
| 290 | \fBmoveto \fIfraction\fR |
| 291 | \fBscroll \fInumber\fB units\fR |
| 292 | \fBscroll \fInumber\fB pages\fR |
| 293 | .CE |
| 294 | .LP |
| 295 | Any of the \fBmoveto\fR, \fBscroll\fR, \fBunits\fR, and \fBpages\fR |
| 296 | keywords may be abbreviated. |
| 297 | If \fIargv\fR has the \fBmoveto\fR form, \fBTK_SCROLL_MOVETO\fR |
| 298 | is returned as result and \fI*dblPtr\fR is filled in with the |
| 299 | \fIfraction\fR argument to the command, which must be a proper real |
| 300 | value. |
| 301 | If \fIargv\fR has the \fBscroll\fR form, \fBTK_SCROLL_UNITS\fR |
| 302 | or \fBTK_SCROLL_PAGES\fR is returned and \fI*intPtr\fR is filled |
| 303 | in with the \fInumber\fR value, which must be a proper integer. |
| 304 | If an error occurs in parsing the arguments, \fBTK_SCROLL_ERROR\fR |
| 305 | is returned and an error message is left in \fIinterp->result\fR. |
| 306 | .PP |
| 307 | \fBTk_GetScrollInfoObj\fR is identical in function to |
| 308 | \fBTk_GetScrollInfo\fR. However, \fBTk_GetScrollInfoObj\fR accepts |
| 309 | Tcl_Obj style arguments, making it more appropriate for use with new |
| 310 | development. |
| 311 | |
| 312 | .SH KEYWORDS |
| 313 | parse, scrollbar, scrolling command, xview, yview |