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Tk_GetScrollInfo(3)   Tk Library Procedures   Tk_GetScrollInfo(3)

_________________________________________________________________

NAME
       Tk_GetScrollInfo - parse arguments for scrolling commands

SYNOPSIS
       #include <tk.h>

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

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

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

       char	    *argv[]   (in)	Argument  strings.  These
					represent the entire wid-
					get command, of which the
					first word  is	typically
					the  widget  name and the
					second word is	typically
					xview	or  yview.   This
					procedure  parses   argu-
					ments	 starting    with
					argv[2].

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

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

DESCRIPTION
       Tk_GetScrollInfo	 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 argv[2].	The words  start-
       ing with argv[2] must have one of the following forms:
	      moveto fraction
	      scroll number units
	      scroll number pages

       Any  of	the moveto, scroll, units, and pages keywords may
       be  abbreviated.	   If	argv   has   the   moveto   form,
       TK_SCROLL_MOVETO	 is  returned  as  result  and *dblPtr is
       filled in with the fraction argument to the command, which

Tk			       4.0				1

Tk_GetScrollInfo(3)   Tk Library Procedures   Tk_GetScrollInfo(3)

       must be a proper real value.  If argv has the scroll form,
       TK_SCROLL_UNITS or TK_SCROLL_PAGES is returned and *intPtr
       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 interp->result.

KEYWORDS
       parse, scrollbar, scrolling command, xview, yview

Tk			       4.0				2

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