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Viewing changes to Nevow/examples/objcontainer/objcontainer.py

  • Committer: Jean-Paul Calderone
  • Date: 2014-06-29 20:33:04 UTC
  • mfrom: (2749.1.1 remove-epsilon-1325289)
  • Revision ID: exarkun@twistedmatrix.com-20140629203304-gdkmbwl1suei4m97
merge lp:~exarkun/divmod.org/remove-epsilon-1325289

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Nevow/examples/objcontainer/objcontainer.py
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"""Example of using nevow.accessors.ObjectContainer to allow data directives to
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look inside application types.
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"""
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from nevow import accessors, inevow, loaders, rend, tags as T
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from twisted.python.components import registerAdapter
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class Image:
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    """An image consisting of a filename and some comments.
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    """
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    def __init__(self, filename, comments):
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        self.filename = filename
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        self.comments = comments
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# Register the adapter so Nevow can access Image instance attributes.
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registerAdapter(accessors.ObjectContainer, Image, inevow.IContainer)
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# Just a list of images to render in the page.
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images = [
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    Image('python.gif', ['Hisssssssss']),
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    Image('cat.gif', ['Meeow', 'Purrrrrrrr']),
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    ]
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class ImagePage(rend.Page):
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    """A simple page that renders a list of images. We registered an adapter
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    earlier so that the data= directives inside the pattern can look inside
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    Image instances.
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    """
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    addSlash = True
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    def render_images(self, ctx, data):
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        """Render a list of images.
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        """
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        tag = T.div(data=images, render=rend.sequence)[
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            T.div(pattern='item')[
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                T.p(data=T.directive('filename'), render=T.directive('data')),
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                T.ul(data=T.directive('comments'), render=rend.sequence)[
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                    T.li(pattern='item', render=T.directive('data')),
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                    ],
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                ],
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            ]
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        return tag
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    docFactory = loaders.stan( T.html[T.body[T.directive('images')]] )
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def createResource():
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    """Create the root resource of the example.
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    """
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    return ImagePage()
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