Re: I've found a bug.

On 02:11 am, [email protected] wrote:
>Wow! Wait. No context? Mean, no slots, patterns and other stuff? And no 
>data :(((( !!! This is not a sollution, sorry. I'm trying to render a 
>TreeView control. It is very deep and mutable. So I have to use data, 
>render sequence, pattern item and so on.

You can do this all without the context.  Consider your tree a nest of 
objects that are being rendered rather than a nest of renderers that are 
invoked with data.

More importantly, Nevow itself is slowly getting rid of the context; it 
was an unfortunate implementation detail that has now polluted the 
design of many, many Nevow applications.  Relying on your renderer's 
place in the page to get the right data (which is effectively what the 
context does) makes your code more fragile and harder to test.  Even if 
this were not so, we would be looking at a way to replace it: among 
other things, it prevents us from making Nevow significantly faster. 
Our long-term goal for some future version of Nevow is to have an entire 
rendering system that does not use the context and can only render 
page.Element objects (or something similar); in the meanwhile, you 
should start looking into things like the renderer that JP linked to :).

Don't worry, this change will not be a sudden surprise: we have too much 
code which uses the context, so there will be a long period where the 
old way of doing things still works.