Tk_GetScrollInfo man page on MacOSX

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Tk_GetScrollInfo(3)	     Tk Library Procedures	   Tk_GetScrollInfo(3)

______________________________________________________________________________

NAME
       Tk_GetScrollInfoObj,  Tk_GetScrollInfo  - parse arguments for scrolling
       commands

SYNOPSIS
       #include <tk.h>

       int
       Tk_GetScrollInfoObj(interp, objc, objv, dblPtr, intPtr)

       int
       Tk_GetScrollInfo(interp, argc, argv, dblPtr, intPtr)

ARGUMENTS
       Tcl_Interp *interp (in)		     Interpreter  to  use  for	 error
					     reporting.

       int objc (in)			     Number   of   Tcl_Obj's  in  objv
					     array.

       Tcl_Obj *const objv[] (in)	     Argument objects.	 These	repre‐
					     sent  the	entire widget command,
					     of which the first word is	 typi‐
					     cally  the	 widget	 name  and the
					     second word is typically xview or
					     yview.

       int argc (in)			     Number of strings in argv array.

       const char *argv[] (in)		     Argument  strings.	  These repre‐
					     sent the entire  widget  command,
					     of	 which the first word is typi‐
					     cally the	widget	name  and  the
					     second word is typically xview or
					     yview.

       double *fractionPtr (out)	     Filled  in	 with  fraction	  from
					     moveto option, if any.

       int *stepsPtr (out)		     Filled in with line or page count
					     from scroll option, if any.   The
					     value may be negative.
_________________________________________________________________

DESCRIPTION
       Tk_GetScrollInfoObj  parses  the arguments expected by widget scrolling
       commands such as xview and yview.  It receives the entire list of words
       that  make  up  a  widget  command  and	parses the words starting with
       objv[2].	 The words starting with objv[2] must have one of the  follow‐
       ing forms:
	      moveto fraction
	      scroll number units
	      scroll number pages

       Any  of	the  moveto, scroll, units, and pages keywords may be abbrevi‐
       ated.  If objv has the moveto form,  TK_SCROLL_MOVETO  is  returned  as
       result  and *fractionPtr is filled in with the fraction argument to the
       command, which must be a proper real value.  If	objv  has  the	scroll
       form,  TK_SCROLL_UNITS  or TK_SCROLL_PAGES is returned and *stepsPtr is
       filled in with the number value, which must be a proper integer.	 If an
       error  occurs in parsing the arguments, TK_SCROLL_ERROR is returned and
       an error message is left in interpreter interp's result.

       Tk_GetScrollInfo is identical in function to Tk_GetScrollInfoObj.  How‐
       ever,  Tk_GetScrollInfo accepts string arguments, making it more appro‐
       priate for use with legacy widgets.

KEYWORDS
       parse, scrollbar, scrolling command, xview, yview

Tk				      8.0		   Tk_GetScrollInfo(3)
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