Bruce & Breeanna Rennie wrote:
> One question I raise for you is how hard (or easy) would it
> be to make the initial value to be a quotation that would be dynamically
> executed at tuple creation time?
Hello,
This would make for simpler constructors in some cases. In some code, you'll
see that slot initialization is factored out. This could be done away with if
the tuple declaration allowed for an "initial expression" to be specified.
One example is the editor gadget. Here's the current tuple, constructor, and
slot initialization code:
----------------------------------------------------------------------
TUPLE: editor
self
font color caret-color selection-color
caret mark
focused? ;
: <loc> ( -- loc ) { 0 0 } <model> ;
: init-editor-locs ( editor -- )
<loc> over set-editor-caret
<loc> swap set-editor-mark ;
: editor-theme ( editor -- )
black over set-editor-color
red over set-editor-caret-color
selection-color over set-editor-selection-color
monospace-font swap set-editor-font ;
: <editor> ( -- editor )
<document> <gadget> editor construct-control
dup dup set-editor-self
dup init-editor-locs
dup editor-theme ;
----------------------------------------------------------------------
If the tuple were described as follows:
TUPLE: editor
self
{ font [ monospace-font ] }
{ color [ black ] }
{ caret-color [ red ] }
{ selection-color [ selection-color ] }
{ caret [ <loc> ] }
{ mark [ <loc> ] } ;
The 'init-editor-locs' and 'editor-theme' word wouldn't be needed. In fact,
they're only used by '<editor>'.
I think it would be good to scan the codebase for more potential applications
of this feature. If there are enough places where it could be used, maybe
there'll be a case for it.
Ed
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