Siarhei Barysiuk schrieb:
> Could you provider me piece of js code where exception may occur and
> describe how we can catch one in js code and how you catch and process
> one in your OxBuilder. I will try translate it in xml notation and
> realize in xslt.
> I'm novice in qooxdoo and I can't see all difficulties which I can meet.
> Your advices will be very much appreciated.
>
> Best regards,
> Siarhei Barysiuk
>
The general logic is the following
<parentTag attribute1="value1" attribute2="value2" >
<childTag attribute3="value3" attribute4="value4">
<eventListenerTag ...>
</childTag>
</parentTag>
the generated code looks like this:
var qx_1 = new parentTag(<constructor vars>);
here is the first problem: how does the parser know which of the
attributes should be used as constructor vars? Two solutions:
a) All classes should be able to be called without constructor vars (good)
b) the parser needs a lookup-table to choose constructor vars from
attributes (bad)
qx_1. set({ <attribute1>:<value1>, <attribute2>:<value2> });
Next problem: what about properties that need two or more pieces of
information? Such as userData or dimension or padding etc. etc. The
parser needs to take care of this through internal lookups.
Now the child needs to be instantiated, configured, and added to the parent.
var qx_2 = new childTag(<constructor vars>);
qx_2. set({ <attribute3>:<value3>, <attribute4>:<value4> });
qx_1.add (qx.2);
This raises all sorts of problems. qooxdoo (at least in 0.5) doesn't
have a linear widget hierarchy. Some widgets need to be added to the top
widgets and not its parent, and then added to the parent through a
property, for example in menus.
There are plenty of other little exceptions. If you look at the PHP
QxBuilder code (do you read PHP?) you can get an idea. You can check it
out with subversion at
https://svn.sourceforge.net/svnroot/bibliograph/QxBuilder
When I have time, I could draw up a flow chart to illustrate which
decisions have to be made at which point - although the logic of XSLT is
obviously different from procedural PHP.
Cheers,
Christian
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