The new operation intentionally demands a statically knowable type to
construct. While this is true of Java as well, it's not true of JavaScript.
However, it is true of the Google Closure compiler's "type system" for
advanced compilation. That said, if the library you're using isn't going to
be optimized with advanced, you can do any typical dynamic metaprogramming
you'd want to do in JavaScript and call in to that.
mynamespace.make = function(cls) {
return new (Function.prototype.bind.apply(cls, arguments));
};
Then from ClojureScript:
(apply mynamespace/make qx.ui.mobile.form.Button ["Go!"])
On Friday, May 27, 2016 at 10:24:12 AM UTC-7, hiskennyness wrote:
>
> qooxdoo lets us supply oft-used widget parameters to the constructor. For
> example, a button can specify its label and icon at new time. And this
> works fine from cljs:
>
> (new qx.ui.mobile.form.Button "Go!") ;; label is the first arg
>
> But I am wrapping qooxdoo in something more concise and want to be able to
> code:
>
> (qxia/make (::Button "Go!")
> ..other init params to be "set"
>
> Unfortunately I cannot even
>
> (new (qx-class qia-type)) ;; computed class
>
> Let alone
>
> (apply new (qx-class qxia-type) make-inits)
>
> Not that I thought I would get away with it. :) I grok new is special.
>
> I can fall back on the qooxdoo API and use setLabel and setIcon, but I
> like learning so I thought I would ask if there were some way to:
>
> 1. compute a class (preferably by first constructing a name) and/or
> 2. do the moral equivalent of applying new to parameters
>
> -hk
>
>
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