[Laszlo-dev] <handler> implementation for review

[P T Withington]

event is the sender, handler is the receiver.  These don't always  
appear in the same class.

On 10 Jan 2006, at 16:38, Sarah Allen wrote:

>
> Sorry I didn't read this proposal earlier.  Overall, it seems like  
> an improvement.  I don't think this affects your changset, but it  
> is feedback to another part of the proposal.
>
> I was thinking that this idiom:
>
> <event name="eventName"/>
> <handler name="eventName" [reference="..."] method="methodName" />
>
> <method name="methodName">
>   ...
> </method>
>
> would be clearer as:
>
> <event name="eventName" method="methodName"/>
>
> <method name="methodName">
>   ...
> </method>
>
> or am I missing something?
>
> Sarah
>
> Henry Minsky wrote:
>
>> Summary: Add <handler> and <event> support to nodes and classes
>>
>> New Features: <handler> and <event> tags
>>
>> Bugs Fixed:
>>
>> Technical Reviewer: ptw
>>
>> QA Reviewer: mdavis
>>
>> Doc Reviewer:
>>
>> Documentation:
>>
>> Release Notes:
>>
>> Details:
>>
>> Implements subset of proposal at
>> http://wiki.openlaszlo.org/Event_and_handler_tags
>>
>> There are currently no compiler warnings for the case where a handler
>> is declared for an undeclared event (in the current class or
>> superclass).
>>
>> This implementation adds <handler> and <event> to the schema, and
>> basically forks a copy of the existing compiler support for <method>
>> to implement <handler>.
>>
>> The <event> tag is treated identically to an <attribute>
>> declaration. For <event> tags in <class> declarations, eventually the
>> compiler should make a list of events declared on a class, so that
>> when a <handler> is encountered, the compiler can check the  
>> superclass
>> chain to make sure that the specified event is declared on the class.
>>
>> [It will be harder to try to check this at compile time if the
>> <handler> has a 'reference' attribute]
>>
>> Unit test in test/events/handler.lzx, incomplete test in warnings.lzx
>>
>>
>> -- 
>> Henry Minsky
>> Software Architect
>> hminsky at laszlosystems.com <mailto:hminsky at laszlosystems.com>
>>
>> --------------------------------------------------------------------- 
>> ---
>>
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>>
>