svv/controllers.py
author Tero Marttila <terom@fixme.fi>
Fri, 07 Jan 2011 02:06:49 +0200
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parent 31 e1b63e4d10f4
child 37 eabea2857143
permissions -rw-r--r--
Optionally take contract text from form input
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# coding: utf-8
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"""
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    Generic controller base classes.
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    respond(Request) -> Response
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"""
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import werkzeug
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from werkzeug import Response
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from svv import html, pdf
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from svv.html import tags
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class AppHandler (object):
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    """
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        Per-request handler type, containing the request context and implementing the response.
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        Works on a generic level, i.e. WSGI/Werkzeug URL-mapped request in, response out.
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    """
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    def __init__ (self, app, request, urlmap) :
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        """
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            Initialize for processing the given Request, to prepare for action-method later on
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                app     - the global Application state
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                request - the request state
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                urlmap  - the URL map we were matched through
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        """
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        self.app = app
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        self.request = request
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        self.urlmap = urlmap
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    def url_for (self, endpoint, **values) :
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        """
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            Return an URL for the given endpoint, applying the given URL-embedded values
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        """
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        return self.urlmap.build(endpoint, values)
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    def redirect_for (self, endpoint, **values) :
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        """
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            Return a Response that will redirect the client to the given endpoint.
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        """
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        return werkzeug.redirect(self.url_for(endpoint, **values))
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    @property
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    def POST (self) :
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        """
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            Access request's POST data
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        """
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        # MultiDict from werkzeug.Request
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        return self.request.form
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    def respond (self, **url_values) :
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        """
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            Handle request that was mapped to ourselves via the URL routing, using given dict of values from URL.
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        """
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        # process e.g. POST data for e.g. redirect
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        response = self.process(**url_values)
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        if not response :
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            # assume superclass does something else if process didn't handle it
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            pass
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        return response
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    def process (self, **args) :
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        """
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            Process incoming POST data, optionally returning a redirect response.
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        """
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        # default to ignore
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        pass
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class PageHandler (AppHandler) :
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    """
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        Specialized AppHandler for normal HTML page views.
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        Renders the layout template and HTML.
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    """
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    def render_content (self, **args) :
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        """
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            Render and return HTML for page content.
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            XXX: must be HTML object, support just text?
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        """
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        raise NotImplementedError()
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    def render_layout (self, content) :
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        """
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            Render the page layout for the given content block.
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        """
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        # XXX: layout template, should be somewhere far away
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        title = "Index"
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        css = [
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                "/static/layout.css", 
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                "/static/style.css", 
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                "/static/forms.css",
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                "/static/tables.css",
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                "/static/treelist.css",
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                "/static/jquery-ui.theme/jquery-ui.css",
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        ]
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        scripts = [
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                "/static/js/jquery.js",
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                "/static/js/jquery-ui.min.js",  # fairly big
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                "/static/js/jquery-ui-timepicker.js",
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                "/static/js/jquery-ui-datepicker-fi.js",
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                "/static/js/forms.js",
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                #"/static/js/prototype.js", 
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                #"/static/js/scriptaculous/scriptaculous.js", 
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                #"/static/js/treelist.js"
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        ]
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        head = (
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            tags.title(title),
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            (tags.link(rel='Stylesheet', type="text/css", href=src) for src in css),
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            # XXX: script can't self-close >_<
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            (tags.script(src=src)(" ") for src in scripts),
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        )
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        # XXX: silly circular-import hack for urls
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        #      it's not sustainable for a base class to referr to its subclasses at define time
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        from svv import urls
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        header = ("Foo List")
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        nav = [tags.ul(tags.li(tags.a(href='#')(name)) for name in ['Nav A', 'Nav B', 'Nav C'])]
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        menu = [tags.ul(tags.li(tags.a(href=url)(name)) for name, url in [
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            ("Etusivu",     self.url_for(urls.Index)),
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            ("Uusi tilaus", self.url_for(urls.NewOrderView)),
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            ("Tilaukset",   self.url_for(urls.OrdersView)),
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            ("Tilaajat",    self.url_for(urls.CustomersView)),
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        ])]
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        footer = ("Copyright?")
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        layout = (
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            tags.div(id='header')(header),
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            tags.div(id='container')(
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                tags.div(id='menu')(menu),
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                # tags.div(id='nav')(nav),
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                tags.div(id='content')(content),
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            ),
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            tags.div(id='footer')(footer),
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        )
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        # perform the actual rendering (run generators etc.)
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        return unicode(html.document(head, layout))
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    def render (self, **url_values) :
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        """
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            Render full page HTML
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        """
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        # render page content
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        content = self.render_content(**url_values)
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        # render into layout
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        response = self.render_layout(content)
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        # ok
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        return response
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    def respond (self, **url_values) :
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        """
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            Build and return a response from the following steps:
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            * process() 
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            * render() -> render_content() as HTML
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        """
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        # optional processing
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        response = super(PageHandler, self).respond(**url_values)
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        if not response :
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            # render page HTML
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            html = self.render(**url_values)
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            # response object
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            # XXX: unicode?
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            return Response(html, mimetype='text/html')
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        # ok
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        return response
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class DocumentHandler (AppHandler) :
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    """
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        PDF generation/export
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    """
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    def respond (self, **url_values) :
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        """
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            Generate the document, and return it as a .pdf file, with the filename generated from the document's title.
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        """
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        # optional processing
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        response = super(DocumentHandler, self).respond(**url_values)
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        if not response :
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            pdf_file = self.generate(**url_values)
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            # file wrapper
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            # XXX: is this any use at all for StringIO?
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            pdf_file = werkzeug.wrap_file(self.request.environ, pdf_file)
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            # respond with file wrapper
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            response = Response(pdf_file, mimetype='application/pdf', direct_passthrough=True)
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        # ok
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        return response
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    def generate (self, **url_values) :
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        """
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            Generate the PDF document as a file-like object.
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        """
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        document, elements = self.generate_document(**url_values)
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        # render and return StringIO
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        return document.render_buf(elements)
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e098ee83b363 Implement OrderContractDocument
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    def generate_document (self, **url_values) :
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        """
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            Return the
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                (DocumentTemplate, elements)
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            to generate the PDF document from.
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        """
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        raise NotImplementedError()
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   240
### XXX: random test controllers
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class Index (PageHandler) :
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    DATA = (
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        (100, "Top A", []),
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        (200, "Top B", [
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            (210, "Mid BA", [
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                (211, "Sub BAA", []),
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                (212, "Sub BAB", []),
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            ]),
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            (220, "Mid BB", []),
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        ]),
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        (300, "Top C", [
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            (310, "Mid CA", []),
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            (320, "Mid CB", []),
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        ]),
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    )
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    def render_content (self) :
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        # build data set
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        data = self.DATA
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        def render_item (id, text, children) :
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            return tags.li(
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                tags.div(class_='item')(
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                    # item text
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                    tags.a(tags.input(type='checkbox', name_=id, checked=(
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                        'checked' if self.request.form.get(str(id)) else None
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                    )), text, class_='text'),
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                ),
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                # children
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                tags.ul(render_item(*item) for item in children if item) if children else None,
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                # 
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                class_=('more open' if children else None),
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            )
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        # XXX: nothing much to see here
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        return tags.h1("Mui.")
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        # render it
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        return (
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            tags.h3("Item list"),
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            tags.form(action='.', method='post')(
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                tags.ul(class_='treelist')(render_item(*item) for item in data),
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                tags.input(type='submit'),
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            ),
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        )
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