/*
* tkUtil.c (CTk) --
*
* This file contains miscellaneous utility procedures that
* are used by the rest of Tk, such as a procedure for drawing
* a focus highlight.
*
* Copyright (c) 1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* @(#) $Id: ctk.shar,v 1.50 1996/01/15 14:47:16 andrewm Exp andrewm $
*/
#include "tk.h"
#include "tkPort.h"
/*
*----------------------------------------------------------------------
*
* Tk_GetScrollInfo --
*
* This procedure is invoked to parse "xview" and "yview"
* scrolling commands for widgets using the new scrolling
* command syntax ("moveto" or "scroll" options).
*
* Results:
* The return value is either TK_SCROLL_MOVETO, TK_SCROLL_PAGES,
* TK_SCROLL_UNITS, or TK_SCROLL_ERROR. This indicates whether
* the command was successfully parsed and what form the command
* took. If TK_SCROLL_MOVETO, *dblPtr is filled in with the
* desired position; if TK_SCROLL_PAGES or TK_SCROLL_UNITS,
* *intPtr is filled in with the number of lines to move (may be
* negative); if TK_SCROLL_ERROR, interp->result contains an
* error message.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tk_GetScrollInfo(interp, argc, argv, dblPtr, intPtr)
Tcl_Interp *interp; /* Used for error reporting. */
int argc; /* # arguments for command. */
char **argv; /* Arguments for command. */
double *dblPtr; /* Filled in with argument "moveto"
* option, if any. */
int *intPtr; /* Filled in with number of pages
* or lines to scroll, if any. */
{
int c;
size_t length;
length = strlen(argv[2]);
c = argv[2][0];
if ((c == 'm') && (strncmp(argv[2], "moveto", length) == 0)) {
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " ", argv[1], " moveto fraction\"",
(char *) NULL);
return TK_SCROLL_ERROR;
}
if (Tcl_GetDouble(interp, argv[3], dblPtr) != TCL_OK) {
return TK_SCROLL_ERROR;
}
return TK_SCROLL_MOVETO;
} else if ((c == 's')
&& (strncmp(argv[2], "scroll", length) == 0)) {
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " ", argv[1], " scroll number units|pages\"",
(char *) NULL);
return TK_SCROLL_ERROR;
}
if (Tcl_GetInt(interp, argv[3], intPtr) != TCL_OK) {
return TK_SCROLL_ERROR;
}
length = strlen(argv[4]);
c = argv[4][0];
if ((c == 'p') && (strncmp(argv[4], "pages", length) == 0)) {
return TK_SCROLL_PAGES;
} else if ((c == 'u')
&& (strncmp(argv[4], "units", length) == 0)) {
return TK_SCROLL_UNITS;
} else {
Tcl_AppendResult(interp, "bad argument \"", argv[4],
"\": must be units or pages", (char *) NULL);
return TK_SCROLL_ERROR;
}
}
Tcl_AppendResult(interp, "unknown option \"", argv[2],
"\": must be moveto or scroll", (char *) NULL);
return TK_SCROLL_ERROR;
}