Hi,
I extended the z3c.form package a little bit by form snippets, which eases the 
development of custom form templates. Widget Snippets are a way to 
automatically surround widget code by custom HTML code, e.g. by error 
handling, a label etc.

Snippets can be accessed over a sub-object of the widget, e.g.:

<span tal:replace="structure view/widgets/myname/snippets/mysnippet" />

Template designers can create their own snippets, register them for a 
view/widget/mode under a name and access them as shown above.

I wrote a simple doctest that explains this further, if you are interested, 
please have look at it. I think my code does not break z3c.form in any way, 
it just extends it, all tests pass.

Please tell me what you think, if you like it, perhaps it could be included in 
z3c.form?

Best Regards,
Hermann

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========
Snippets
========

The idea of widget snippets is that often widgets will have some surrounding
HTML code, perhaps a label, outlining what e.g. an input field is for, some
code regarding error handling and perhaps some simple formatting.

For instance, a widget may render as:

<input type="text" value="" />

But in the resulting HTML page, we need some surrounding code, e.g.

<div>
MyWidget: <input type="text" value="" />
</div>

Widget Snippets allow designers to create custom snippets and register them
for certain widgets and display modes. 

First we have to register the meta configuration for the directive.

  >>> import zope,sys
  >>> from zope.configuration import xmlconfig
  >>> import z3c.form
  >>> context = xmlconfig.file('meta.zcml', z3c.form)
  >>> from z3c.form import testing
  >>> testing.setupFormDefaults()

We need a custom snippet template

  >>> import os, tempfile
  >>> temp_dir = tempfile.mkdtemp()
  >>> file = os.path.join(temp_dir, 'snippet_div_input.pt')
  >>> open(file, 'w').write('''
  ... <div tal:content="structure view/label">label</div>
  ... <div tal:content="structure view/render">widget</div>
  ... ''')

Now we register it

  >>> context = xmlconfig.string("""
  ... <configure
  ...     xmlns:z3c="http://namespaces.zope.org/z3c";>
  ...   <z3c:snippetTemplate
  ...       name="div"
  ...       mode="input"
  ...       template="%s"
  ...       />
  ... </configure>
  ... """ % file, context=context)

And now we do that for a different snippet and register it under a
different name

  >>> file = os.path.join(temp_dir, 'snippet_span_input.pt')
  >>> open(file, 'w').write('''
  ... <div>
  ... <span tal:replace="structure view/label" />:
  ... <span tal:replace="structure view/render" />
  ... </div>
  ... ''')
  >>> context = xmlconfig.string("""
  ... <configure
  ...     xmlns:z3c="http://namespaces.zope.org/z3c";>
  ...   <z3c:snippetTemplate
  ...       name="span"
  ...       mode="input"
  ...       template="%s"
  ...       />
  ... </configure>
  ... """ % file, context=context)

Now we need a template for our form, which demonstrates the use
of the different snippets.

  >>> file = os.path.join(temp_dir, 'myform.pt')
  >>> open(file, 'w').write('''
  ... <span tal:replace="structure view/widgets/myname/snippets/div" />
  ... <span tal:replace="structure view/widgets/myname/snippets/span" />
  ... ''')

We can see that the registered snippets are available under the widget
and the object "snippets".

We need some interface/class/browser view

  >>> class IPerson(zope.interface.Interface):
  ...    
  ...    myname=zope.schema.TextLine(title=u'Persons Name')
  >>> class Person(object):
  ...    zope.interface.implements(IPerson)
  ...    myname=''
  ...
  ...    def __init__(self, myname):
  ...       self.myname = myname

Now we create a form with our template, instantiate and update it 
(we use an AddForm as we have no context)

  >>> from z3c.form import form, field
  >>> from z3c.form.testing import TestRequest
  >>> from zope.app.pagetemplate.viewpagetemplatefile import 
ViewPageTemplateFile
  >>> class PersonForm(form.AddForm):
  ...    
  ...    fields = field.Fields(IPerson)  
  ...    template = ViewPageTemplateFile('myform.pt', temp_dir)
  ...
  >>> request = TestRequest()
  >>> personForm = PersonForm(None, request)
  >>> personForm.update()

And now we render the form

  >>> print personForm.render()    
  <BLANKLINE>
  <BLANKLINE>
  <div>Persons Name</div>
  <div><input type="text" id="form-widgets-myname"
         name="form.widgets.myname"
         class="textWidget textline-field" value="" />
  </div>
  <BLANKLINE>
  <BLANKLINE>
  <div>
  Persons Name:
  <input type="text" id="form-widgets-myname"
         name="form.widgets.myname"
         class="textWidget textline-field" value="" />
  <BLANKLINE>
  </div>
  <BLANKLINE>
  <BLANKLINE>
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