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Tk_GetScrollInfo(3)		      Tk Library Procedures		      Tk_GetScrollInfo(3)

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NAME
       Tk_GetScrollInfo, Tk_GetScrollInfoObj - parse arguments for scrolling commands

SYNOPSIS
       #include <tk.h>

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

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

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

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

       const char *argv[] (in)		Argument strings.  These represent the entire widget com-
					mand, of which the first word  is  typically  the  widget
					name and the second word is typically xview or yview.

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

       Tcl_Obj *const objv[] (in)	Argument objects.  These represent the entire widget com-
					mand, of which the first word  is  typically  the  widget
					name and the second word is typically xview or yview.

       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.
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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 starting 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 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 argu-
       ments, TK_SCROLL_ERROR is returned and an error message is left in interp->result.

       Tk_GetScrollInfoObj   is   identical   in   function   to   Tk_GetScrollInfo.	 However,
       Tk_GetScrollInfoObj  accepts  Tcl_Obj  style arguments, making it more appropriate for use
       with new development.

KEYWORDS
       parse, scrollbar, scrolling command, xview, yview

Tk					       8.0			      Tk_GetScrollInfo(3)
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