[Laszlo-dev] dguide: Color chapter

P T Withington ptw at pobox.com
Thu Nov 13 09:17:44 PST 2008


Basically, using '0x000000' in CSS was a kludge, non-standard, and  
probably should have been documented as such.  It will cause a  
deprecation warning.

Any of the other 3 methods are standard, acceptable, and work.

It would be fine with me if we just said that you specified colors the  
same as the CSS standard.

You can specify your color as a numeric value also, the result of a  
computation, it doesn't need to be expressed as a hex constant.

On 2008-11-13, at 08:49EST, Lou Iorio wrote:

> The text preceding Example 20.3. Coloring text using CSS seems to  
> completely contradict what the example shows.
>
> The text says:
>
> OpenLaszlo enables coloring in four ways: 0x000000, #000000,  
> rgb(0,0,0), and "black". For now, the best reason to prefer to use  
> the hex style 0x000000 is that it always works, whether the color is  
> assigned explicitly within the view, or by stylesheet. Color  
> assignment by stylesheet fails by name, #hex, or rgb(). Explicit  
> color assignment by rgb() fails unless the RGB values are all  
> numerals -- that is, rgb(0,0,0) produces black, but rgb(FF,FF,FF),  
> which should produce white, comes back at compile time as an invalid  
> color.
>
> Coloring of text with fgcolor="foo" is enabled in the same fashions,  
> but with the same limitations.
>
> CSS spits out an error if you use 0x000000. How about:
>
> OpenLaszlo enables coloring in four ways: 0x000000, #000000,  
> rgb(0,0,0), and "black". Using the format 0x000000 only works for  
> explicit assignment; it does not work in CSS. Color assignment using  
> rgb() must be specified with decimal values from 0 - 255.
>
> Coloring of text with fgcolor="foo" is enabled in the same fashions,  
> but with the same limitations.
>
> In addition, the title of the example, "Coloring text using CSS",  
> might be better if changed to "Applying color explictly and with  
> CSS" since it shows coloring views as well as text.
>
> If you agree (or have a better idea), I'll make the changes.
>
> Lou



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