view.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 10 Jun 2009 12:08:57 +0200
branchstable
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child 2203 efdd3a9f9028
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fix TimeField format_prop, use format_single_value directly in render_example
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"""abstract views and templates classes for CubicWeb web client
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from cStringIO import StringIO
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from logilab.common.deprecation import obsolete
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from logilab.mtconverter import html_escape
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from cubicweb import NotAnEntity
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from cubicweb.selectors import yes, non_final_entity, nonempty_rset, none_rset
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from cubicweb.selectors import require_group_compat, accepts_compat
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from cubicweb.appobject import AppRsetObject
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from cubicweb.utils import UStringIO, HTMLStream
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# robots control
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NOINDEX = u'<meta name="ROBOTS" content="NOINDEX" />'
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NOFOLLOW = u'<meta name="ROBOTS" content="NOFOLLOW" />'
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CW_XHTML_EXTENSIONS = '''[
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  <!ATTLIST html xmlns:cubicweb CDATA  #FIXED \'http://www.logilab.org/2008/cubicweb\'  >
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<!ENTITY % coreattrs
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 "id          ID            #IMPLIED
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  class       CDATA         #IMPLIED
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  style       CDATA         #IMPLIED
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  title       CDATA         #IMPLIED
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 cubicweb:sortvalue         CDATA   #IMPLIED
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 cubicweb:target            CDATA   #IMPLIED
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 cubicweb:limit             CDATA   #IMPLIED
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 cubicweb:type              CDATA   #IMPLIED
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 cubicweb:loadtype          CDATA   #IMPLIED
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 cubicweb:wdgtype           CDATA   #IMPLIED
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 cubicweb:initfunc          CDATA   #IMPLIED
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 cubicweb:inputid           CDATA   #IMPLIED
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 cubicweb:tindex            CDATA   #IMPLIED
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 cubicweb:inputname         CDATA   #IMPLIED
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 cubicweb:value             CDATA   #IMPLIED
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 cubicweb:required          CDATA   #IMPLIED
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 cubicweb:accesskey         CDATA   #IMPLIED
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 cubicweb:maxlength         CDATA   #IMPLIED
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 cubicweb:variables         CDATA   #IMPLIED
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 cubicweb:displayactions    CDATA   #IMPLIED
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 cubicweb:fallbackvid       CDATA   #IMPLIED
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 cubicweb:fname             CDATA   #IMPLIED
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 cubicweb:vid               CDATA   #IMPLIED
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 cubicweb:rql               CDATA   #IMPLIED
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 cubicweb:actualrql         CDATA   #IMPLIED
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 cubicweb:rooteid           CDATA   #IMPLIED
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 cubicweb:dataurl           CDATA   #IMPLIED
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 cubicweb:size              CDATA   #IMPLIED
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 cubicweb:tlunit            CDATA   #IMPLIED
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 cubicweb:loadurl           CDATA   #IMPLIED
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 cubicweb:uselabel          CDATA   #IMPLIED
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 cubicweb:facetargs         CDATA   #IMPLIED
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 cubicweb:facetName         CDATA   #IMPLIED
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  "> ] '''
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TRANSITIONAL_DOCTYPE = u'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" %s>\n' % CW_XHTML_EXTENSIONS
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TRANSITIONAL_DOCTYPE_NOEXT = u'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">\n'
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STRICT_DOCTYPE = u'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" %s>\n' % CW_XHTML_EXTENSIONS
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STRICT_DOCTYPE_NOEXT = u'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">\n'
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# base view object ############################################################
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class View(AppRsetObject):
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    """abstract view class, used as base for every renderable object such
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    as views, templates, some components...web
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    A view is instantiated to render a [part of a] result set. View
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    subclasses may be parametred using the following class attributes:
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    * `templatable` indicates if the view may be embeded in a main
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      template or if it has to be rendered standalone (i.e. XML for
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      instance)
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    * if the view is not templatable, it should set the `content_type` class
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      attribute to the correct MIME type (text/xhtml by default)
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    * the `category` attribute may be used in the interface to regroup related
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      objects together
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    At instantiation time, the standard `req`, `rset`, and `cursor`
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    attributes are added and the `w` attribute will be set at rendering
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    time to a write function to use.
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    """
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    __registry__ = 'views'
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    registered = require_group_compat(AppRsetObject.registered)
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    templatable = True
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    need_navigation = True
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    # content_type = 'application/xhtml+xml' # text/xhtml'
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    binary = False
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    add_to_breadcrumbs = True
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    category = 'view'
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    def __init__(self, req=None, rset=None, **kwargs):
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        super(View, self).__init__(req, rset, **kwargs)
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        self.w = None
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    @property
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    def content_type(self):
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        return self.req.html_content_type()
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    def set_stream(self, w=None):
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        if self.w is not None:
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            return
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        if w is None:
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            if self.binary:
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                self._stream = stream = StringIO()
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            else:
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                self._stream = stream = UStringIO()
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            w = stream.write
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        else:
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            stream = None
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        self.w = w
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        return stream
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    # main view interface #####################################################
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   127
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    def render(self, w=None, **context):
0
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        """called to render a view object for a result set.
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        This method is a dispatched to an actual method selected
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        according to optional row and col parameters, which are locating
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        a particular row or cell in the result set:
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        * if row is specified, `cell_call` is called
0
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        * if none of them is supplied, the view is considered to apply on
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          the whole result set (which may be None in this case), `call` is
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          called
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        """
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        row = context.get('row')
0
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        if row is not None:
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            context.setdefault('col', 0)
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            view_func = self.cell_call
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        else:
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            view_func = self.call
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        stream = self.set_stream(w)
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        # stream = self.set_stream(context)
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   148
        view_func(**context)
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        # return stream content if we have created it
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        if stream is not None:
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            return self._stream.getvalue()
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   153
    dispatch = obsolete('.dispatch is deprecated, use .render')(render)
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   154
0
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    # should default .call() method add a <div classs="section"> around each
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   156
    # rset item
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    add_div_section = True
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   158
0
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   159
    def call(self, **kwargs):
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        """the view is called for an entire result set, by default loop
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        other rows of the result set and call the same view on the
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        particular row
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   163
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   164
        Views applicable on None result sets have to override this method
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   165
        """
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   166
        rset = self.rset
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   167
        if rset is None:
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   168
            raise NotImplementedError, self
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   169
        wrap = self.templatable and len(rset) > 1 and self.add_div_section
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   170
        for i in xrange(len(rset)):
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   171
            if wrap:
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   172
                self.w(u'<div class="section">')
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   173
            self.wview(self.id, rset, row=i, **kwargs)
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   174
            if wrap:
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   175
                self.w(u"</div>")
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   176
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   177
    def cell_call(self, row, col, **kwargs):
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   178
        """the view is called for a particular result set cell"""
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   179
        raise NotImplementedError, self
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   180
0
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   181
    def linkable(self):
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   182
        """return True if the view may be linked in a menu
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diff changeset
   183
0
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   184
        by default views without title are not meant to be displayed
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   185
        """
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   186
        if not getattr(self, 'title', None):
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   187
            return False
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   188
        return True
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   189
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   190
    def is_primary(self):
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   191
        return self.id == 'primary'
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diff changeset
   192
0
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   193
    def url(self):
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   194
        """return the url associated with this view. Should not be
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   195
        necessary for non linkable views, but a default implementation
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   196
        is provided anyway.
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   197
        """
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   198
        try:
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   199
            return self.build_url(vid=self.id, rql=self.req.form['rql'])
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   200
        except KeyError:
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   201
            return self.build_url(vid=self.id)
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   202
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   203
    def set_request_content_type(self):
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   204
        """set the content type returned by this view"""
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   205
        self.req.set_content_type(self.content_type)
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   206
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   207
    # view utilities ##########################################################
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diff changeset
   208
1985
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1977
diff changeset
   209
    def wview(self, __vid, rset=None, __fallback_vid=None, **kwargs):
0
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   210
        """shortcut to self.view method automatically passing self.w as argument
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diff changeset
   211
        """
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diff changeset
   212
        self.view(__vid, rset, __fallback_vid, w=self.w, **kwargs)
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diff changeset
   213
819
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parents: 816
diff changeset
   214
    # XXX Template bw compat
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diff changeset
   215
    template = obsolete('.template is deprecated, use .view')(wview)
0
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diff changeset
   216
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   217
    def whead(self, data):
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   218
        self.req.html_headers.write(data)
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   219
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   220
    def wdata(self, data):
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   221
        """simple helper that escapes `data` and writes into `self.w`"""
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diff changeset
   222
        self.w(html_escape(data))
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parents:
diff changeset
   223
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   224
    def html_headers(self):
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   225
        """return a list of html headers (eg something to be inserted between
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parents:
diff changeset
   226
        <head> and </head> of the returned page
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parents:
diff changeset
   227
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   228
        by default return a meta tag to disable robot indexation of the page
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diff changeset
   229
        """
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diff changeset
   230
        return [NOINDEX]
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diff changeset
   231
0
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diff changeset
   232
    def page_title(self):
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diff changeset
   233
        """returns a title according to the result set - used for the
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diff changeset
   234
        title in the HTML header
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diff changeset
   235
        """
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diff changeset
   236
        vtitle = self.req.form.get('vtitle')
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diff changeset
   237
        if vtitle:
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diff changeset
   238
            return self.req._(vtitle)
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diff changeset
   239
        # class defined title will only be used if the resulting title doesn't
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parents:
diff changeset
   240
        # seem clear enough
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diff changeset
   241
        vtitle = getattr(self, 'title', None) or u''
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parents:
diff changeset
   242
        if vtitle:
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parents:
diff changeset
   243
            vtitle = self.req._(vtitle)
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diff changeset
   244
        rset = self.rset
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diff changeset
   245
        if rset and rset.rowcount:
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diff changeset
   246
            if rset.rowcount == 1:
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diff changeset
   247
                try:
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   248
                    entity = self.complete_entity(0)
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diff changeset
   249
                    # use long_title to get context information if any
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diff changeset
   250
                    clabel = entity.dc_long_title()
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parents:
diff changeset
   251
                except NotAnEntity:
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   252
                    clabel = display_name(self.req, rset.description[0][0])
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diff changeset
   253
                    clabel = u'%s (%s)' % (clabel, vtitle)
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parents:
diff changeset
   254
            else :
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parents:
diff changeset
   255
                etypes = rset.column_types(0)
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parents:
diff changeset
   256
                if len(etypes) == 1:
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diff changeset
   257
                    etype = iter(etypes).next()
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diff changeset
   258
                    clabel = display_name(self.req, etype, 'plural')
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parents:
diff changeset
   259
                else :
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parents:
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                    clabel = u'#[*] (%s)' % vtitle
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        else:
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            clabel = vtitle
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        return u'%s (%s)' % (clabel, self.req.property_value('ui.site-title'))
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    def output_url_builder( self, name, url, args ):
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        self.w(u'<script language="JavaScript"><!--\n' \
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               u'function %s( %s ) {\n' % (name, ','.join(args) ) )
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        url_parts = url.split("%s")
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        self.w(u' url="%s"' % url_parts[0] )
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        for arg, part in zip(args, url_parts[1:]):
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            self.w(u'+str(%s)' % arg )
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            if part:
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                self.w(u'+"%s"' % part)
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        self.w('\n document.window.href=url;\n')
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        self.w('}\n-->\n</script>\n')
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    def create_url(self, etype, **kwargs):
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        """ return the url of the entity creation form for a given entity type"""
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        return self.req.build_url('add/%s'%etype, **kwargs)
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    def field(self, label, value, row=True, show_label=True, w=None, tr=True):
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        """ read-only field """
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        if w is None:
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            w = self.w
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        if row:
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            w(u'<div class="row">')
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        if show_label:
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            if tr:
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                label = display_name(self.req, label)
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            w(u'<span class="label">%s</span>' % label)
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        w(u'<div class="field">%s</div>' % value)
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        if row:
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            w(u'</div>')
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0
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# concrete views base classes #################################################
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class EntityView(View):
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    """base class for views applying on an entity (i.e. uniform result set)"""
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    __select__ = non_final_entity()
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    registered = accepts_compat(View.registered)
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    category = 'entityview'
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0
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class StartupView(View):
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    """base class for views which doesn't need a particular result set to be
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    displayed (so they can always be displayed !)
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    """
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    __select__ = none_rset()
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    registered = require_group_compat(View.registered)
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0
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    category = 'startupview'
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0
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    def url(self):
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        """return the url associated with this view. We can omit rql here"""
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        return self.build_url('view', vid=self.id)
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    def html_headers(self):
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        """return a list of html headers (eg something to be inserted between
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        <head> and </head> of the returned page
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        by default startup views are indexed
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        """
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        return []
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class EntityStartupView(EntityView):
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    """base class for entity views which may also be applied to None
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    result set (usually a default rql is provided by the view class)
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    """
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    __select__ = none_rset() | non_final_entity()
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0
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    default_rql = None
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    def __init__(self, req, rset, **kwargs):
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        super(EntityStartupView, self).__init__(req, rset, **kwargs)
0
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        if rset is None:
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            # this instance is not in the "entityview" category
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            self.category = 'startupview'
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    def startup_rql(self):
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        """return some rql to be executed if the result set is None"""
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        return self.default_rql
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0
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    def call(self, **kwargs):
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        """override call to execute rql returned by the .startup_rql method if
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        necessary
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        """
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        if self.rset is None:
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            self.rset = self.req.execute(self.startup_rql())
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        rset = self.rset
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        for i in xrange(len(rset)):
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            self.wview(self.id, rset, row=i, **kwargs)
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    def url(self):
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        """return the url associated with this view. We can omit rql if we are
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        on a result set on which we do not apply.
0
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        """
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        if self.rset is None:
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            return self.build_url(vid=self.id)
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        return super(EntityStartupView, self).url()
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0
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class AnyRsetView(View):
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    """base class for views applying on any non empty result sets"""
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    __select__ = nonempty_rset()
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    category = 'anyrsetview'
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    def columns_labels(self, tr=True):
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        if tr:
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            translate = display_name
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        else:
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            translate = lambda req, val: val
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        rqlstdescr = self.rset.syntax_tree().get_description()[0] # XXX missing Union support
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        labels = []
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        for colindex, attr in enumerate(rqlstdescr):
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            # compute column header
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            if colindex == 0 or attr == 'Any': # find a better label
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                label = ','.join(translate(self.req, et)
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                                 for et in self.rset.column_types(colindex))
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            else:
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                label = translate(self.req, attr)
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            labels.append(label)
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   387
        return labels
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0
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# concrete template base classes ##############################################
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class MainTemplate(View):
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    """main template are primary access point to render a full HTML page.
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    There is usually at least a regular main template and a simple fallback
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    one to display error if the first one failed
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    """
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    registered = require_group_compat(View.registered)
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    @property
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    def doctype(self):
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        if self.req.xhtml_browser():
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            return STRICT_DOCTYPE
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        return STRICT_DOCTYPE_NOEXT
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    def set_stream(self, w=None):
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        if self.w is not None:
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            return
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        if w is None:
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            if self.binary:
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                self._stream = stream = StringIO()
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            else:
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                self._stream = stream = HTMLStream(self.req)
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            w = stream.write
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        else:
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            stream = None
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        self.w = w
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        return stream
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    def write_doctype(self, xmldecl=True):
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        assert isinstance(self._stream, HTMLStream)
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        self._stream.doctype = self.doctype
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        if not xmldecl:
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            self._stream.xmldecl = u''
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    def linkable(self):
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        return False
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# concrete component base classes #############################################
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class ReloadableMixIn(object):
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    """simple mixin for reloadable parts of UI"""
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    def user_callback(self, cb, args, msg=None, nonify=False):
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        """register the given user callback and return an url to call it ready to be
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        inserted in html
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        """
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        self.req.add_js('cubicweb.ajax.js')
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        if nonify:
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            _cb = cb
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            def cb(*args):
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                _cb(*args)
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        cbname = self.req.register_onetime_callback(cb, *args)
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        return self.build_js(cbname, html_escape(msg or ''))
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    def build_update_js_call(self, cbname, msg):
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        rql = html_escape(self.rset.printable_rql())
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        return "javascript:userCallbackThenUpdateUI('%s', '%s', '%s', '%s', '%s', '%s')" % (
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            cbname, self.id, rql, msg, self.__registry__, self.div_id())
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    def build_reload_js_call(self, cbname, msg):
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        return "javascript:userCallbackThenReloadPage('%s', '%s')" % (cbname, msg)
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    build_js = build_update_js_call # expect updatable component by default
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    def div_id(self):
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        return ''
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class Component(ReloadableMixIn, View):
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    """base class for components"""
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    __registry__ = 'components'
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    __select__ = yes()
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    property_defs = {}
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    def div_class(self):
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        return '%s %s' % (self.propval('htmlclass'), self.id)
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    def div_id(self):
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        return '%sComponent' % self.id