Merged from trunk 25970:

Updated to reflect reality (perhaps). Also, rely on DEPENDENCIES.cfg and interfaces.py for more documentation.
zopefoundation · Jul 2, 2004 · 2c840c8 · 2c840c8
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+==============
+Page Templates
+==============
+
+:Author:  Kapil Thangavelu <hazmat at objectrealms.net>
+
+Introduction
+------------
+
+Page Templates provide an elegant templating mechanism that achieves a
+clean separation of presentation and application logic while allowing
+for designers to work with templates in their visual editing tools
+(FrontPage, Dreamweaver, GoLive, etc.).
+
+This document focuses on usage of Page Templates outside of a Zope
+context, it does *not* explain how to write page templates as there
+are several resources on the web which do so.
+
+Simple Usage
+------------
+
+Using Page Templates outside of Zope3 is very easy and straight
+forward.  A quick example::
+
+  >>> from zope.pagetemplate.pagetemplatefile import PageTemplateFile
+  >>> my_pt = PageTemplateFile('hello_world.pt')
+  >>> my_pt()
+  u'<html><body>Hello World</body></html>'
+
+Subclassing PageTemplates
+-------------------------
+
+Lets say we want to alter page templates such that keyword arguments
+appear as top level items in the namespace.  We can subclass
+`PageTemplate` and alter the default behavior of `pt_getContext()` to
+add them in::
+
+  from zope.pagetemplate.pagetemplate import PageTemplate
+
+  class mypt(PageTemplate):
+      def pt_getContext(self, args=(), options={}, **kw):
+         rval = PageTemplate.pt_getContext(self, args=args)
+         options.update(rval)
+         return options
+
+  class foo:
+      def getContents(self): return 'hi'
+
+So now we can bind objects in a more arbitrary fashion, like the
+following::
+
+  template = """
+  <html>
+  <body>
+  <b tal:replace="das_object/getContents">Good Stuff Here</b>
+  </body>
+  </html>
+  """
+
+  pt = mypt()
+  pt.write(template)
+  pt(das_object=foo())
+
+See interfaces.py.