<HTML><HEAD><TITLE>Tk Library Procedures - Tk_GetScrollInfo manual page</TITLE></HEAD><BODY> <H3><A NAME="M2">NAME</A></H3> Tk_GetScrollInfo - parse arguments for scrolling commands <H3><A NAME="M3">SYNOPSIS</A></H3> <B>#include <tk.h></B><BR> int<BR> <B>Tk_GetScrollInfo(</B><I>interp, argc, argv, dblPtr, intPtr</I><B>)</B><BR> <H3><A NAME="M4">ARGUMENTS</A></H3> <DL> <P><DT><A HREF="../TclLib/Interp.htm">Tcl_Interp</A> <B>*interp</B> (in)<DD> Interpreter to use for error reporting. <P><DT>int <B>argc</B> (in)<DD> Number of strings in <I>argv</I> array. <P><DT>char <B>*argv[]</B> (in)<DD> Argument strings. These represent the entire widget command, of which the first word is typically the widget name and the second word is typically <B>xview</B> or <B>yview</B>. This procedure parses arguments starting with <I>argv</I>[2]. <P><DT>double <B>*dblPtr</B> (out)<DD> Filled in with fraction from <B>moveto</B> option, if any. <P><DT>int <B>*intPtr</B> (out)<DD> Filled in with line or page count from <B>scroll</B> option, if any. The value may be negative. <P></DL> <H3><A NAME="M5">DESCRIPTION</A></H3> <B>Tk_GetScrollInfo</B> parses the arguments expected by widget scrolling commands such as <B>xview</B> and <B>yview</B>. It receives the entire list of words that make up a widget command and parses the words starting with <I>argv</I>[2]. The words starting with <I>argv</I>[2] must have one of the following forms: <PRE><B>moveto </B><I>fraction</I> <B>scroll </B><I>number</I><B> units</B> <B>scroll </B><I>number</I><B> pages</B></PRE> <P> Any of the <B>moveto</B>, <B>scroll</B>, <B>units</B>, and <B>pages</B> keywords may be abbreviated. If <I>argv</I> has the <B>moveto</B> form, <B>TK_SCROLL_MOVETO</B> is returned as result and <I>*dblPtr</I> is filled in with the <I>fraction</I> argument to the command, which must be a proper real value. If <I>argv</I> has the <B>scroll</B> form, <B>TK_SCROLL_UNITS</B> or <B>TK_SCROLL_PAGES</B> is returned and <I>*intPtr</I> is filled in with the <I>number</I> value, which must be a proper integer. If an error occurs in parsing the arguments, <B>TK_SCROLL_ERROR</B> is returned and an error message is left in <I>interp->result</I>. <H3><A NAME="M6">KEYWORDS</A></H3> <A href="../Keywords/P.htm#parse">parse</A>, <A href="../Keywords/S.htm#scrollbar">scrollbar</A>, <A href="../Keywords/S.htm#scrolling command">scrolling command</A>, <A href="../Keywords/X.htm#xview">xview</A>, <A href="../Keywords/Y.htm#yview">yview</A> <HR><PRE> <A HREF="../copyright.htm">Copyright</A> © 1994 The Regents of the University of California. <A HREF="../copyright.htm">Copyright</A> © 1994-1996 Sun Microsystems, Inc. <A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE> </BODY></HTML>
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