[Laszlo-dev] [Platform-team] lz.colors question

[Max Carlson]

Sounds good, though perhaps accept could be clearer - it's really type-sensitive parsing... I can't think of anything better at the moment.


-----Original Message-----
From: P T Withington <ptw at pobox.com>
Sent: Friday, November 14, 2008 11:55 AM
To: Max Carlson <max at openlaszlo.org>
Cc: J Crowley <jcrowley at laszlosystems.com>; Platform Team <platform-team at laszlosystems.com>; Laszlo-dev bug reporting <laszlo-dev at openlaszlo.org>
Subject: Re: [Platform-team] lz.colors question

But he should also be able to say:

   bgcolor="iceblue"

and/or

   bgcolor="${this.acceptValue('iceblue', 'color')}"

Which might be more instructive.  In the first case, you are  
specifying a constant color, and since bgcolor is an attribute with a  
type of `color` the token `iceblue` is acceptable as a value (not  
tested).  In the second case, you are using a constraint, and (at  
least as of now), constraints are simply expressions that _directly_  
set the value of an attribute -- they _do_not_ pass through the data  
interface, which converts string representations into values according  
to type.  (I think this is desirable.)  So, in the second case, I am  
calling the (currently unpublished) `acceptValue` method, which takes  
a string representation of a value and parses it according to the  
specified type.

There should be a better way.  Perhaps I should be able to say:

   bgcolor="$accept{'iceblue'}"

(meaning use acceptValue and the attribute's declared type to parse  
the value of the expression)?  We've already got $path and $style, why  
not $accept (unless someone can come up with a better name).  I think  
this would allow me to say something like:

   <inputtext id="color" />
   <view bgcolor="$accept{color.text}" />

would that be useful?


On 2008-11-13, at 21:16EST, Max Carlson wrote:

> You should be able to just set it to bgcolor="lz.colors.iceblue4" -  
> constraints shouldn't be required.  Also note that colors aren't in  
> global[] anymore - use lz.colors[''] instead.
>
> J Crowley wrote:
>> So, I'm working on fixing one of the color dguide examples.  The  
>> description on the doc page (docs/developers/color.html) reads:
>> -----
>> To specify any color but the 16 which are usable by name, use  
>> 0xFFFFFF hex codes. Alternatively, the non-standard colors named in  
>> |lps/components/base/colors.lzx| were added to OpenLaszlo's global  
>> namespace. Those colors can also be employed by name, but note the $ 
>> {constraint} synta

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