[Laszlo-dev] [Platform-team] System calls

[Henry Minsky]

I'll take a pass at it.



On Sun, Sep 14, 2008 at 5:44 PM, P T Withington <ptw at pobox.com> wrote:

> It's petty clear to me that we need to bring passthrough technology up to
> the LZX level. Max already filed a request... I think it's up to you or I to
> just do it.
>
>
> On Sep 14, 2008, at 1:32 AM, "Henry Minsky" <hminsky at laszlosystems.com>
> wrote:
>
>  To expand on this, I'm working on the debugger GUI component now, and it
>> almost compiles in swf9, except that I need some lines of runtime-specific
>> code to instantiate a loader class for doing eval() requests to the server.
>>
>> In swf8, the code is
>>
>> this.evalloader =  new LzLoader(this.sprite, { attachname: 'debugloader'
>> });
>>
>> in swf9, it needs to be
>>
>>        this.evalloader = new Loader();
>>        this.evalloader.contentLoaderInfo.addEventListener(Event.INIT,
>> debugEvalListener);
>>
>> LzLoader is an internal swf8 kernel class, while Loader and Event.INIT are
>> as3
>> library classes.
>>
>> So I'm not sure what the most expedient way to deal with this is.
>>
>> I was thinking maybe something like using the <switch> tag to
>> conditionalize creating different code at the level of methods, but I still
>> need some way to insert the "import flash.xx.*;" statements into the class
>> declaration that gets generated. If I had the proposed <passthrough> tag, it
>> might looks like
>>
>> <class name="LzDebugWindow" >
>>  <switch>
>>    <when runtime="swf9">
>>        <passthrough context="class">
>>             import flash.util.*;
>>             import flash.events.*;
>>        </passthrough>
>>      <method name="makeEvalLoader">
>>        debugloader = new Loader();
>>        debugloader.contentLoaderInfo.addEventListener(Event.INIT,
>> debugEvalListener);
>>      </method>
>>      <method name="debugEvalListener" args="event:Event">
>>         ...
>>      </method>
>>    </when>
>>    <otherwise>
>>      <method name="makeEvalLoader">
>>        return new LzLoader(this.sprite, { attachname: 'debugloader' });
>>      </method>
>>    </otherwise>
>> </switch>
>>
>>
>>
>> In this case, it might or might not be better to structure the
>> LzDebugWindow as an abstract base class with everything except the
>> runtime-specific methods, and then have the debugger/Library.lzs
>> include a runtime-specific final class which would define those
>> methods, so I'd have a common file with
>>
>>    <class name="LzBaseDebugWindow">
>>    ...
>>    </class>
>>
>> and then make mutually exclusive swf8 and swf9 files which defined the
>> runtime-specific methods. But I'd still need this <passthrough> tag to
>> get the import statements forced into the intermediate script code.
>>
>> <library>
>>  <switch>
>>    <when runtime="swf8">
>>      <include href="swf8debugger.lzx">
>>    </when>
>>    <when runtime="dhtml">
>>     <!-- no debugger component in dhtml -->
>>    </when>
>>    <when runtime="swf9">
>>      <include href="swf9debugger.lzx"/>
>>    </otherwise>
>>  </switch>
>> </library>
>>
>>
>>
>>


-- 
Henry Minsky
Software Architect
hminsky at laszlosystems.com
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