119 lines
5.1 KiB
HTML
119 lines
5.1 KiB
HTML
<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<META NAME="GENERATOR" CONTENT="Mozilla/4.04 [en] (X11; I; Linux 2.0.33 i586) [Netscape]">
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</HEAD>
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<BODY>
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<CENTER>
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<H1>
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<B>STklos version 4.0</B></H1></CENTER>
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<H3>
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What is STklos</H3>
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STklos is an extension of STk which provides à la CLOS objets to
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STk. This implementation is based on the
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<BR>implementation of version 1.3 of the Tiny CLOS package defined
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by Gregor Kickzales (available by ftp at <A HREF="ftp://parcftp.xerox.com/pub/mop/">parcftp.xerox.com:/pub/mop/*</A>).
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<H3>
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Compiling STklos</H3>
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STklos is compiled during the interpreter construction. You don't have
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to do something in this directory.
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<H3>
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Simple Test of STklos</H3>
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STklos needs some files to run properly. Until you have installed it in
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its definitive place, you have to:
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<OL>
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<LI>
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set your default directory to STklos</LI>
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<LI>
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use the the shell script ../Src/test-stk to run the interpreter</LI>
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</OL>
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So, you just have to type
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<UL><TT>$ cd STklos; ../Src/test-stk</TT></UL>
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To test, that everything is OK, you can try:
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<UL><TT>(let ()</TT>
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<BR><TT> (define-class A () ((a :initform 10) b))</TT>
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<BR><TT> (define inst (make A))</TT>
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<BR><TT> (slot-set! inst 'b 20)</TT>
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<BR><TT> (+ (slot-ref inst 'a) (slot-ref inst 'b)))</TT></UL>
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which should yield 30 if everything is correct.
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<H3>
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Using STklos with the Tk toolkit</H3>
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A set of classes have been defined to use Tk with object flavor. All the
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Tk widgets have been wrapped in STklos. classes.The following example
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creates a three buttons panel (button 1 & 2 being on top of button
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3).
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<UL><TT>(require "Tk-classes")</TT>
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<BR><TT>(define f (make <Frame>))</TT>
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<BR><TT>(define b1 (make <Button> :text "Button 1" :parent f))</TT>
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<BR><TT>(define b2 (make <Button> :text "Button 2" :parent f))</TT>
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<BR><TT>(define b3 (make <Button> :text "Button 3"))</TT>
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<BR><TT>(pack b1 b2 :side "left")</TT>
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<BR><TT>(pack f b3 :fill "both" :expand #t)</TT></UL>
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Note usage of Scheme names in the two preceding pack calls instead of dotted
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Tcl/Tk names.
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<P>Tk options can be seen as slot in the STklos world. So getting the font
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of button 3 can be done with
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<UL><TT>(font b3)</TT></UL>
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and changing its value can be done with
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<UL> (<TT>set! (font b3) '(Courier))</TT></UL>
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and associating a callback to button 1 can be done with the following expression
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<UL><TT>(set! (command b1) (lambda ()</TT>
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<BR><TT>
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(format #t "You have typed on \"Button1\"\n"))</TT></UL>
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The desribe function permits to see all the slots value of a given object.
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For instance,
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<UL><TT>(describe b2)</TT></UL>
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would give something like:
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<UL><TT>#[<button> 401bfdbc] is an instance of class <button></TT>
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<BR><TT>Slots are:</TT>
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<BR><TT> id = #[Tk-command .v184.v214]</TT>
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<BR><TT> eid = #[Tk-command .v184.v214]</TT>
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<BR><TT> parent = #[<frame> 401b5304]</TT>
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<BR><TT> bitmap = ""</TT>
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<BR><TT> width = 0</TT>
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<BR><TT> height = 0</TT>
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<BR><TT> anchor = "center"</TT>
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<BR><TT> font = "-Adobe-Helvetica-Bold-R-Normal--*-120-*-*-*-*-*-*"</TT>
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<BR><TT> foreground = "Black"</TT>
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<BR><TT> image = ""</TT>
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<BR><TT> justify = "center"</TT>
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<BR><TT> pad-x = 9</TT>
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<BR><TT> pad-y = 3</TT>
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<BR><TT> text = "Button 2"</TT>
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<BR><TT> text-variable = ""</TT>
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<BR><TT> underline = -1</TT>
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<BR><TT> wrap-length = 0</TT>
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<BR><TT> background = "#d9d9d9"</TT>
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<BR><TT> border-width = 2</TT>
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<BR><TT> cursor = ""</TT>
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<BR><TT> highlight-background = "#d9d9d9"</TT>
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<BR><TT> highlight-color = "Black"</TT>
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<BR><TT> highlight-thickness = 0</TT>
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<BR><TT> relief = "raised"</TT>
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<BR><TT> take-focus = ""</TT>
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<BR><TT> active-background = "#ececec"</TT>
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<BR><TT> active-foreground = "Black"</TT>
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<BR><TT> command = ""</TT>
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<BR><TT> disabled-foreground = "#a3a3a3"</TT>
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<BR><TT> state = "normal"</TT></UL>
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Destruction of a button can be obtained with the destroy-widget generic
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function as in
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<UL>(<TT>destroy b2)</TT></UL>
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<H3>
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Examples</H3>
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Some examples (too few) are available in the Examples directory. What those
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examples do is not interesting <I>per se </I>but rather how they are written.
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<BR><B>Note</B>:There are not enough examples. Send me programs if you
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have interestingpieces of code to make this directory growing.Thanks
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<BR>
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<P>Have fun.
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<BR>
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</BODY>
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</HTML>
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