Currently in LZX, you can create a (n anonymous) setter for your
attribute by saying:
<class name="base">
<attribute name="foo" setter="this.foostate = frob(foo)" />
...
</class>
Recently, the question came up: "how do you override that setter in a
subclass, and how do you call the superclass setter from the
override?" The following proposal addresses the question:
In a subclass, you override a setter by naming the same attribute and
giving a new setter:
<class name="sub" extends="base">
<attribute name="foo" setter="..." />
If you want to invoke the superclass setter, you use
`super.setAttribute('foo', ...`:
<class name="sub" extends="base">
<attribute name="foo" setter="this.note('setting foo');
super.setAttribute('foo', foo)" />
For legibility, we would also like to introduce a new <setter> tag
that allows you to write a setter more in the style of a method, for
cases of complex setters. Hence the above could also be written:
<class name="sub" extends="base">
<setter name="foo" args="newfoo">
this.note('Setting foo to: ' + newfoo);
super.setAttribute('foo', newfoo);
</setter>
Comments?
