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
                                        command, 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
                                        command, 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
       arguments, 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