Thread: [Cppcms-users] Custom form rendering and dynamic widgets

Brought to you by: artyom-beilis

cppcms-users

[Cppcms-users] Custom form rendering and dynamic widgets

From: Julian P. <ju...@wh...> - 2010-08-30 01:58:30

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Hallo,

I've a question concerning the custom form rendering. My situation is,
that I have a form which gets filled with widgets at runtime (by a JSON
configuration), so that I don't know which widgets it will contain when
it has to be rendered.
So how can I iterate over the form's widgets in my template to do custom
rendering? <% form input my_input %> won't work here as I don't know how
many widgets there are.
May I use a construct like
<% foreach widget in form %> here?

Thanks,
Julian
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Re: [Cppcms-users] Custom form rendering and dynamic widgets

From: Artyom <art...@ya...> - 2010-08-30 04:15:25

> May I use a construct like
> <%  foreach widget in form %> here?

Yes, you can. 

See: http://art-blog.no-ip.info/cppcms_ref_v0_99/classcppcms_1_1form.html

it has forward iterator in it and thus you can iterate over the
form.

There is an example from src/hello_world_view1.tmpl


        <% foreach w as cppcms::form::iterator in form %>
            <% separator %><br/><% item %>
                <% if w.has_message() %><% w.message() %>:<% end %>
                <% form input w %>
                <% if not w.valid() %>:<% w.error_message() %><% end %>
            <% end %>
        <% end %>

Artyom

Re: [Cppcms-users] Custom form rendering and dynamic widgets

From: Julian P. <ju...@wh...> - 2010-08-30 23:52:32

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Am 30.08.2010 06:15, schrieb Artyom:
>> May I use a construct like
>> <%  foreach widget in form %> here?
> 
> Yes, you can. 
> 
> See: http://art-blog.no-ip.info/cppcms_ref_v0_99/classcppcms_1_1form.html
> 
> it has forward iterator in it and thus you can iterate over the
> form.
> 
> There is an example from src/hello_world_view1.tmpl
> 
> 
>         <% foreach w as cppcms::form::iterator in form %>
>             <% separator %><br/><% item %>
>                 <% if w.has_message() %><% w.message() %>:<% end %>
>                 <% form input w %>
>                 <% if not w.valid() %>:<% w.error_message() %><% end %>
>             <% end %>
>         <% end %>
> 
> Artyom
> 
> 

Ok, thanks for this example. But I still have a problem: Because even
the forms on this page are dynamically allocated, they are stored in a
vector, and because they are not copyable, I store a booster::shared_ptr
to them instead.
I loop with
<% foreach form in forms %>
But the problem is, that now the following construct
<% foreach w as cppcms::form::iterator in form %>
does not work, because the template generator expects form to be the
object itself (and therefore generates form.begin() and form.end()
instead of form->begin() and form->end() which would have to be used
here). Is there a way around this apart of editing the generated
template afterwards?

Thanks,
Julian
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Re: [Cppcms-users] Custom form rendering and dynamic widgets

From: Artyom <art...@ya...> - 2010-08-31 04:27:52

> 
> Ok,  thanks for this example. But I still have a problem: Because even
> the forms  on this page are dynamically allocated, they are stored in a
> vector, and  because they are not copyable, I store a booster::shared_ptr
> to them  instead.
> I loop with
> <% foreach form in forms %>
> But the problem  is, that now the following construct
> <% foreach w as  cppcms::form::iterator in form %>
> does not work, because the template  generator expects form to be the
> object itself (and therefore generates  form.begin() and form.end()
> instead of form->begin() and form->end()  which would have to be used
> here). 

You can use:

  <% foreach w as cppcms::form::iterator in *form %>

BTW `as foo` is required only for MSVC as gcc and intel have
a construct typeof, so you can just use

  <% foreach w in *form %>

Generally in every place where you use variable you can
use "->", ".", "*" and single "()" operator.

See: 
<http://art-blog.no-ip.info/wikipp/en/page/cppcms_1x_templates_gen#Syntax+Description+Rules>


Artyom

Re: [Cppcms-users] Custom form rendering and dynamic widgets

From: <ju...@ne...> - 2010-08-31 10:16:46

> You can use:
>
>   <% foreach w as cppcms::form::iterator in *form %>
>
> BTW `as foo` is required only for MSVC as gcc and intel have
> a construct typeof, so you can just use
>
>   <% foreach w in *form %>
>

I tried that already, but gcc exits with the following errors (not
different of the errors I get when I specify form instead of *form):

stdconfig.tmpl: In member function virtual void
stdconfig::stdconfig::get_content():
stdconfig.tmpl:11: error: class
booster::shared_ptr<iweb2::content::StdConfigForm> has no member named
begin
stdconfig.tmpl:12: error: invalid type in declaration before = token
stdconfig.tmpl:12: error: class
booster::shared_ptr<iweb2::content::StdConfigForm> has no member named
begin
stdconfig.tmpl:12: error: class
booster::shared_ptr<iweb2::content::StdConfigForm> has no member named
end
stdconfig.tmpl:11: error: invalid type argument of unary *
stdconfig.tmpl:11: error: invalid type in declaration before = token
stdconfig.tmpl:11: error: invalid type argument of unary *

Any solution to this? Up to now, the only solution that worked was, to
manually change any appearance of form.begin() and form.end() to
form->begin() and form->end().

Thanks,
Julian

[Cppcms-users] template-based widget rendering - Re: Custom form rendering and dynamic widgets

From: augustin <aug...@ov...> - 2010-08-31 04:27:54

Hello,

On the topic of widget rendering, I think the rendering of each type of widget 
should be template-based.
Currently, the default form rendering is hard-coded. 

I currently use the hack from  src/hello_world_view1.tmpl that Artyom kindly 
indicated twice in recent weeks.

I don't know what it would take to make it so that the default rendering for 
each form item is based on a template that can be overridden at the skin 
level, as well as at the form level. Maybe it's already possible. I haven't 
tested much yet.


Augustin.



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Re: [Cppcms-users] template-based widget rendering - Re: Custom form rendering and dynamic widgets

From: Artyom <art...@ya...> - 2010-08-31 06:23:13

> Hello,
> 
> On the topic of widget rendering, I think the rendering of  each type of widget 
>
> should be template-based.
> Currently, the default form  rendering is hard-coded. 
> 

The hard coded options are only for some basic cases, for custom template 
rendering
you can create your own template easily

  <% template my_form_render(cppcms::form &f) %>
    <% foreach w in f %>
    ... Do anything you like ...
    <% end %>
  <% end %>


and then, instead of calling

  <% form as_p my_form %>

you call

  <% include my_form_render(my_form) %>

Artyom

Re: [Cppcms-users] Custom form rendering and dynamic widgets

From: Julian P. <ju...@wh...> - 2010-08-31 09:59:36

> You can use:
>
>   <% foreach w as cppcms::form::iterator in *form %>
>
> BTW `as foo` is required only for MSVC as gcc and intel have
> a construct typeof, so you can just use
>
>   <% foreach w in *form %>
>

I tried that already, but gcc exits with the following errors (not
different of the errors I get when I specify form instead of *form):

stdconfig.tmpl: In member function virtual void
stdconfig::stdconfig::get_content():
stdconfig.tmpl:11: error: class
booster::shared_ptr<iweb2::content::StdConfigForm> has no member named
begin
stdconfig.tmpl:12: error: invalid type in declaration before = token
stdconfig.tmpl:12: error: class
booster::shared_ptr<iweb2::content::StdConfigForm> has no member named
begin
stdconfig.tmpl:12: error: class
booster::shared_ptr<iweb2::content::StdConfigForm> has no member named
end
stdconfig.tmpl:11: error: invalid type argument of unary *
stdconfig.tmpl:11: error: invalid type in declaration before = token
stdconfig.tmpl:11: error: invalid type argument of unary *

Any solution to this? Up to now, the only solution that worked was, to
manually change any appearance of form.begin() and form.end() to
form->begin() and form->end().

Thanks,
Julian

Re: [Cppcms-users] Custom form rendering and dynamic widgets

From: Artyom <art...@ya...> - 2010-08-31 10:54:35

Hi,

Ok, I see, you are right, this does not work
as cppcms_tmpl_cc generates:

   *foo.bar.begin()

When it should


   (*foo.bar).begin()

Fixed in svn 1385, take latest revision.

Artyom

P.S.: Next time generated code sample that fails would be helpful



----- Original Message ----
> From: Julian Pietron <ju...@wh...>
> To: cpp...@li...
> Sent: Tue, August 31, 2010 1:01:25 PM
> Subject: Re: [Cppcms-users] Custom form rendering and dynamic widgets
> 
> 
> > You can use:
> >
> >   <% foreach w as  cppcms::form::iterator in *form %>
> >
> > BTW `as foo` is required  only for MSVC as gcc and intel have
> > a construct typeof, so you can just  use
> >
> >   <% foreach w in *form %>
> >
> 
> I tried  that already, but gcc exits with the following errors (not
> different of the  errors I get when I specify form instead of *form):
> 
> stdconfig.tmpl: In  member function virtual  void
> stdconfig::stdconfig::get_content():
> stdconfig.tmpl:11: error:  class
> booster::shared_ptr<iweb2::content::StdConfigForm> has no member  named
> begin
> stdconfig.tmpl:12: error: invalid type in declaration before =  token
> stdconfig.tmpl:12: error:  class
> booster::shared_ptr<iweb2::content::StdConfigForm> has no member  named
> begin
> stdconfig.tmpl:12: error:  class
> booster::shared_ptr<iweb2::content::StdConfigForm> has no member  named
> end
> stdconfig.tmpl:11: error: invalid type argument of unary  *
> stdconfig.tmpl:11: error: invalid type in declaration before =  token
> stdconfig.tmpl:11: error: invalid type argument of unary *
> 
> Any  solution to this? Up to now, the only solution that worked was, to
> manually  change any appearance of form.begin() and form.end() to
> form->begin() and  form->end().
> 
> Thanks,
> Julian
> 
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