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About Scheme

• A module system has been added
• Integration of the Bigloo MATCH-CASE and MATCH-LAMBDA primitives. Furthermore, the file bigloo.stk provide some compatibility between STk and bigloo modules.
• A simple FFI has been added. It allows to access C functions without writing C code (works only on a limited set of architectures for now).
• integrates the R5RS VALUES and CALL-WITH-VALUES
• multi-line comments have been added.
• The "-file" interpreter option is no more necessary
• Display of the prompt and of the eval result in the REPL are now user definable.
• report-error mechanism has been enhanced a lot (work is not completely achieved).
• new-primitives: append!, mast-pair, C-string->string, remove-file, rename-file, temporary-file-name, ...
• Numerous bug corrections
• ...

About Tk

• Integration of the Tk8.0 toolkit
• The old inspector has been adapted to work with current release (not completely, but sufficiently while the new version is terminated)
• Buttons, Checkbuttons and Radiobuttons can use a :variable and :textvariable in a given environment. This environment is given with the new :environment option.
• New metaclass: <Tk-composite-toplevel>. This is identical to the class <Tk-composite-widget>, except that the widget lives in its own toplevel window.
• make-image simplifies the usage of Tk images and uses a cache, to speed-up access to already used images.
• The little square window, which used to appear as soon as STk was launched, appears now only when the first widget is mapped on screen.
• ...

About STklos

• The MOP of STklos is now very similar to the CLOS one. Here are some of the new features:
  • when a slot does not exists, the gf slot-missing is called
  • when a unbound slot is read, the gf slot-unbound is called
  • new generic functions slot-ref-using-class, slot-set-using-class, slot-bound-using-class?, slot-exists-using-class?, slot-definition-name, slot-definition-options, slot-definition-allocation, slot-definition-getter, slot-definition-setter, slot-definition-accessor, generic-function-name, generic-function-methods, method-generic-function, method-specializers method-procedure, remove-method change-object-class
• When a class is redefined, the instances and methods which uses it are redefined accordingly, as in CLOS (i.e. if you add a slot in a class, all its -- direct or indirect -- instances will have the new slot added dynamically.
• New kind of slot allocation: "active". An active slot is a slot for which you can put a daemon before or after its reading/writing
• Standard behavior of class slots is now identical to CLOS: when a class-slot is inherited, it is shared with instances of the superclass. If it is redefined, a new slot is created
• slot initializers are evaluated in the lexical environment of the class definition.
• (Tk-)virtual slots can now have an :initform option.
• Generic functions can be now traced with the standard TRACE function.
• Composite widgets have now a class slots which contains the class of the object. This slot is initialized by default to "Composite", but it can be overloaded for a particular class. For instance labeled entries use the value "LabeledEntry" by default. This feature can be used for initializing the X11 resource database. for instance you can have STk*LabeledEntry*Entry*Background: white in your .Xdefaults file to set the default value of background of the entry of a <Labeled-entry> widget.
• New composites widgets: Gauge, Valued-Gauge, Balloon-help, Labeled-Frame
• The HTML-browser has been enhanced to access now the web (i.e. you can grab distant texts or images). The Web browser admit now applets written in Scheme.
• New kind of slot allocation: "active". An active slot is a slot for which you can put a daemon before or after its reading/writing
• extended types (defined in C) are now automatically integrated in the STklos hierarchy.
• Several new classes for displaying messages boxes
• New class <Color-box> for choosing colors.
• New <Tk-Text-inset>. This class is the now the parent class of <Text-window> and of (the new) class <Text-image>.
• ...