74 lines
2.9 KiB
HTML
74 lines
2.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
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<!--Converted with LaTeX2HTML 96.1-c (Feb 29, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds -->
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<HTML>
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<TITLE>8.8.3 Use Options</TITLE>
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<A NAME="tex2html1764" HREF="node113.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME="tex2html1762" HREF="node108.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME="tex2html1758" HREF="node111.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME="tex2html1766" 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="tex2html1765" HREF="node113.html">8.9 Clear Window and </A>
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<B>Up:</B> <A NAME="tex2html1763" HREF="node108.html">8.8 Options</A>
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<B> Previous:</B> <A NAME="tex2html1759" HREF="node111.html">8.8.2 Terminal Attributes</A>
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<BR> <P>
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<H2><A NAME="SECTION00983000000000000000">8.8.3 Use Options</A></H2>
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<P>
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Now we have seen the window options and terminal modes it is time to
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describe their use.
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<P>
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First, on Linux you should enable the keypad. This will allow
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use of the cursor keys and the numeric block on the PC keyboard.
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<P>
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<P><P>
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<P>
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Now, there are two main types of input.
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<P>
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<OL><LI> The program wants the user to enter a
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key and then will call a function depend
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on this key. (For example, something like "press 'q' for quit" and wait
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for <I>q</I>)<LI> The program wants a string of characters typed by the user in a mask
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on the screen. For example: a directory or an address in a database.
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</OL>
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<P>
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For the first we use the following options and modes and the while loop will
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work correctly.
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<P>
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<P><P>
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<P>
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The program will hang until a key is pressed. If the key was
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<I>q</I> we call our quit function else we wait for other input.
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<P>
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The switch statement can be expanded until we have an input function that
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fits our wishes. Use the KEY_* macros to check special keys, for instance
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<P>
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<P><P>
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<P>
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for the cursor keys on the keyboard.
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For a file viewer the loop can look like this:
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<P>
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<P><P>
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<P>
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For the second, we only need to set <B>echo()</B> and the characters typed
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by the user will be printed to the screen. To have the characters printed
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on the position you want, use <B>move(...)</B> or <B>wmove(...)</B>.
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<P>
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Or, we could open a window with a mask in it
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(some other colors than those of the window
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will do this) and ask the user to input a string:
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<P>
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<P><P>
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<P>
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See .c in the example directory for more explanation.
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<P>
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<BR> <HR>
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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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</ADDRESS>
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