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63 lines
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<TITLE>8.13 Scrolling</TITLE>
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<A NAME="tex2html1819" HREF="node118.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME="tex2html1817" HREF="node85.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME="tex2html1811" HREF="node116.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME="tex2html1821" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME="tex2html1820" HREF="node118.html">8.14 Pads</A>
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<B>Up:</B> <A NAME="tex2html1818" HREF="node85.html">8 Character Cell Graphics</A>
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<B> Previous:</B> <A NAME="tex2html1812" HREF="node116.html">8.12 Cursor and Window </A>
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<BR> <P>
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<H1><A NAME="SECTION009130000000000000000">8.13 Scrolling</A></H1>
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<P>
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<UL><LI> <TT>int scrollok(win, bf)</TT> <A NAME="fun_scrollok"> </A><BR>
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If TRUE, the text in the window <TT>win</TT> will be scrolled up one line
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when the cursor is on the lower right corner and a character is typed
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(or newline). If FALSE, the cursor is left in the same position.
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<P>
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When turned on the contents of a window
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can be scrolled with the following functions.
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(<B>Note:</B> It would be also
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scrolled, if you print a new line in the last line of the window. So, be
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careful with <B>scrollok(...)</B> or you will get unreasonable results.)<LI> <TT>int scroll(win)</TT> <A NAME="fun_scroll"> </A><BR>
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This function will scroll up the window (and the lines in the data
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structure) one line.<LI> <TT>int scrl(n)</TT> <A NAME="fun_scrl"> </A><BR>
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<TT>int wscrl(win, n)</TT> <A NAME="fun_wscrl"> </A><BR>
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These functions will scroll the window or <TT>win</TT> up or
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down depending on the value of the integer <TT>n</TT>. If <TT>n</TT> is
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positive the window will be scrolled up <TT>n</TT> lines, otherwise if
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<TT>n</TT> is negative the window will be scrolled down <TT>n</TT> lines.<LI> <TT>int setscrreg(t, b)</TT> <A NAME="fun_setscrreg"> </A><BR>
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<TT>int wsetscrreg(win, t, b)</TT> <A NAME="fun_wsetscrreg"> </A><BR>
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Set a software scrolling region.
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</UL>
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<P>
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The following code should explain how to get the effect of scrolling a text
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on the screen. Look also in .c in the example directory.
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<P>
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We have a window with 18 lines and 66 columns and want to scroll a text
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in it. <I>S[]</I> is a character array with the text. <I>Max_s</I> is the
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number of the last line in <I>s[]</I>. <I>Clear_line</I> will print blank
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characters from the current cursor position up to the end of the line
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using the current attributes from the window (not A_NORMAL as clrtoeol
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does). <I>Beg</I> is the last line from <I>s[]</I> currently shown on the
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screen. <I>Scroll</I> is an enumerate to tell the function what to do, show
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the NEXT or PREVious line from the text.
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<P>
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<P><P><HR><A NAME="tex2html1819" HREF="node118.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME="tex2html1817" HREF="node85.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME="tex2html1811" HREF="node116.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME="tex2html1821" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME="tex2html1820" HREF="node118.html">8.14 Pads</A>
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<B>Up:</B> <A NAME="tex2html1818" HREF="node85.html">8 Character Cell Graphics</A>
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<B> Previous:</B> <A NAME="tex2html1812" HREF="node116.html">8.12 Cursor and Window </A>
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<P><ADDRESS>
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<I>Converted on: <BR>
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Fri Mar 29 14:43:04 EST 1996</I>
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