[Laszlo-dev] tagnames

[André Bargull]

On 8/5/2008 10:04 PM, P T Withington wrote:
> I see what you are getting at, but doing so would break this invariant:
> 
>   lz[this.constructor.tagname] == this.constructor

This is only true in debug-mode!

 From NodeModel.java:
> // If there are methods, make a class
> if (debug) {
>   String name = id;
>   if (name == null) {
>     name = CompilerUtils.attributeUniqueName(element, "class");
>   }     
>   // Update tagname to our custom class
>   tagName = tagName + "_" + name;
> } else {
>   *// Don't create a tag for anonymous classes
>   tagName = null;*
> }


And a small testcase:
> <canvas debug="false" >
>   <button onclick="txt.setText(this.constructor.tagname)" />
>   <text id="txt" x="50" />
> </canvas>


> 
> which is presently true for all classes.  We would have to say that for 
> 'anonymous' classes that does not hold.  That's probably ok, but I 
> expect that is why it is currently the way it is (at some point in the 
> evolution, the anonymous classes were instantiated with a tagname which 
> had to be unique; now that they are instantiated directly with their 
> classname, we could avoid creating the unique tagnames).
> 
> Perhaps there should be some amendment to the debugger also to print 
> these anonymous classes in a prettier fashion too.
> 
> On 2008-08-05, at 13:43EDT, André Bargull wrote:
> 
>> An user asked me on the forum 
>> (http://forum.openlaszlo.org/showthread.php?t=12198):
>>
>>> what i want to ask is:
>>> does OL support the original "tagname" in customized instances 
>>> (constraint and method filled in tag )?
>>> or
>>> it is a defect?
>>
>> So, whenever an anonymous class was created (because of constraints, 
>> handlers etc), do we provide a way to retrieve the original tagname?
>> In my mind, a reasonable question, names like 
>> "/button_$$2Etmp_C697C77B63C2714AA45A51E9F3163AFA_hello$2Elzx_2_32/" 
>> look ugly and do confuse people (at least me when I see those names in 
>> the debugger :-) ).
>>
>>
>> ---
>> And I don't want to get this answer: ;-)
>>> /foo/.constructor.prototype.constructor.tagname
>>
> 
>