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