1996-09-27 06:29:02 -04:00
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<HTML><HEAD><TITLE>Tk Built-In Commands - listener manual page</TITLE></HEAD>
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1998-04-10 06:59:06 -04:00
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<BR>
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1996-09-27 06:29:02 -04:00
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<BODY bgcolor = #c3ffc3>
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<H2><IMG ALIGN=BOTTOM SRC="./Img/ManPageGreen.gif"> listener</H2>
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<I>Create and manipulate listener widgets</I><P><IMG ALIGN=TOP SRC="./Img/line-red.gif">
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<H3><A NAME="M2">SYNOPSIS</A></H3>
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(<B>listener</B><I> widget-name </I>?<I>options</I>?)<BR>
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<BR>
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<H3><A NAME="M3">WIDGET-SPECIFIC OPTIONS</A></H3>
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<DL>
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<P>
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<DT><I>Name</I>: <B></B>
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<DT><I>Class</I>: <B></B>
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<DT><I>Option keyword</I>: <B><A NAME="M4">:command</A></B>
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<DT><I>STklos slot name</I>: <B>command</B>
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<DD>Specifies a STk procedure to associate with the listener. This procedure
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is invoked when a complete s-expr is entered in the listener. This s-expr is
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passed as a string to the procedure. The procedure must return the string
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which will be inserted in response to the s-expr input. The default procedure
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is the Identity procdure.
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<P>
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<P>
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<DT><I>Name</I>: <B></B>
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<DT><I>Class</I>: <B></B>
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<DT><I>Option keyword</I>: <B><A NAME="M5">:output-color</A></B>
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<DT><I>STklos slot name</I>: <B>output-color</B>
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<DD>Specifies the color used the output lines
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<P>
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<P>
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<DT><I>Name</I>: <B></B>
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<DT><I>Class</I>: <B></B>
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<DT><I>Option keyword</I>: <B><A NAME="M6">:prompt-color</A></B>
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<DT><I>STklos slot name</I>: <B>prompt-color</B>
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<DD>Specifies the color used for the prompt
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<P>
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<P>
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<DT><I>Name</I>: <B></B>
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<DT><I>Class</I>: <B></B>
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<DT><I>Option keyword</I>: <B><A NAME="M7">:prompt</A></B>
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<DT><I>STklos slot name</I>: <B>prompt</B>
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<DD>Specifies the prompt used for reading s-expr. Defaults to "> "
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<P>
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</DL>
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<H3><A NAME="M8">DESCRIPTION</A></H3>
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The <B>listener</B> procedure creates a new text window (given by the
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<I>widget-name</I> argument) and associates it bindiangs suitable for a listener.
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Since a listener is in fact a text widget, all the options of <B><A HREF="./text.n.html">text</A></B>
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are applicable to a listener.
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The <B>listener</B> procedure returns its
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<I>widget-name</I> argument. At the time this procedure is invoked,
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there must not exist a window named <I>widget-name</I>, but
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<I>widget-name</I>'s parent must exist.
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<P>
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A listener is a widget for doing interactive I/O. Typical usage for
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this widget consists of a text window whose inputs are sent to the
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Scheme evaluator and whose result is displayed in the listener. An
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example for this is shown at the end of this page.
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<H3><A NAME="M9">WIDGET PROCEDURE</A></H3>
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All the <B><A HREF="./text.n.html">text</A></B> procedure are avialble for a listener, plus
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<P>
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<DL>
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<DT><A NAME="M10">(<B>listener-insert-string</B> <I>widget-name str</I>)</A><DD>
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inserts the string <I>str</I> just before the input prompt.
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<P>
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</DL>
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<H3><A NAME="M11">EXAMPLE</A></H3>
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Hereafter is a simple use of the listener widget which interact with the
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evaluator.
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<P>
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<PRE>(listener '.t :width 50
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:height 10
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:command (lambda (x)
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(eval-string x (global-environment))))
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(pack .t)</PRE>
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1998-04-10 06:59:06 -04:00
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<P>
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1996-09-27 06:29:02 -04:00
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<H3><A NAME="M12">DEFAULT BINDINGS</A></H3>
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The defaults bindings are identical to the <B><A HREF="./text.n.html">text</A></B> bindings.
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<H3><A NAME="M13">SEE ALSO</A></H3>
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<B><A HREF="./text.n.html">text</A></B>
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1998-04-10 06:59:06 -04:00
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<P><IMG ALIGN=TOP SRC="./Img/line-red.gif"><P>
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1996-09-27 06:29:02 -04:00
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<A HREF=./STk-hlp.html><IMG ALIGN=BOTTOM SRC="./Img/RefBookGreen.gif"> Back to the <B>STk</B> main page</A>
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</BODY></HTML>
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