common/view.py
author Nicolas Chauvat <nicolas.chauvat@logilab.fr>
Thu, 13 Nov 2008 02:38:34 +0100
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"""abstract views and templates classes for CubicWeb web client
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:organization: Logilab
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:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from cStringIO import StringIO
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from logilab.mtconverter import html_escape
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from cubicweb import NotAnEntity, NoSelectableObject
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from cubicweb.common.registerers import accepts_registerer, priority_registerer
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from cubicweb.common.selectors import (in_group_selector, anyrset_selector, 
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                                    emptyrset_selector, accept_selector,
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                                    norset_selector, chainfirst)
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from cubicweb.common.appobject import AppRsetObject, ComponentMixIn
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from cubicweb.common.utils import UStringIO, HTMLStream
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_ = unicode
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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: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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  "> ] '''
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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'
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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'
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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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    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, rset):
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        super(View, self).__init__(req, rset)
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        self.w = None
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    @property
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    def content_type(self):
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        if self.req.xhtml_browser():
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            return 'application/xhtml+xml'
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        return 'text/html'
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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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    def dispatch(self, w=None, **context):
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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 [and col] are specified, `cell_call` is called
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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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   133
          called
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   134
        """
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   135
        row, col = context.get('row'), context.get('col')
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   136
        if row is not None:
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   137
            context.setdefault('col', 0)
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   138
            view_func = self.cell_call
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   139
        else:
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   140
            view_func = self.call
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   141
        stream = self.set_stream(w)
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   142
        # stream = self.set_stream(context)
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   143
        view_func(**context)
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   144
        # return stream content if we have created it
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   145
        if stream is not None:
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   146
            return self._stream.getvalue()
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   147
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   148
    # should default .call() method add a <div classs="section"> around each
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   149
    # rset item
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   150
    add_div_section = True
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   151
    
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   152
    def call(self, **kwargs):
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        """the view is called for an entire result set, by default loop
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   154
        other rows of the result set and call the same view on the
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   155
        particular row
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diff changeset
   156
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   157
        Views applicable on None result sets have to override this method
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parents:
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   158
        """
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parents:
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   159
        rset = self.rset
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   160
        if rset is None:
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   161
            raise NotImplementedError, self
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   162
        wrap = self.templatable and len(rset) > 1 and self.add_div_section
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   163
        for i in xrange(len(rset)):
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diff changeset
   164
            if wrap:
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   165
                self.w(u'<div class="section">')
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   166
            self.wview(self.id, rset, row=i, **kwargs)
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diff changeset
   167
            if wrap:
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parents:
diff changeset
   168
                self.w(u"</div>")
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parents:
diff changeset
   169
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   170
    def cell_call(self, row, col, **kwargs):
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   171
        """the view is called for a particular result set cell"""
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   172
        raise NotImplementedError, self
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parents:
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   173
        
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   174
    def linkable(self):
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   175
        """return True if the view may be linked in a menu
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parents:
diff changeset
   176
        
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   177
        by default views without title are not meant to be displayed
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diff changeset
   178
        """
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diff changeset
   179
        if not getattr(self, 'title', None):
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   180
            return False
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diff changeset
   181
        return True
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parents:
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   182
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   183
    def is_primary(self):
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   184
        return self.id == 'primary'
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parents:
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   185
    
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   186
    def url(self):
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diff changeset
   187
        """return the url associated with this view. Should not be
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parents:
diff changeset
   188
        necessary for non linkable views, but a default implementation
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diff changeset
   189
        is provided anyway.
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parents:
diff changeset
   190
        """
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parents:
diff changeset
   191
        try:
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diff changeset
   192
            return self.build_url(vid=self.id, rql=self.req.form['rql'])
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parents:
diff changeset
   193
        except KeyError:
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diff changeset
   194
            return self.build_url(vid=self.id)
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parents:
diff changeset
   195
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diff changeset
   196
    def set_request_content_type(self):
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parents:
diff changeset
   197
        """set the content type returned by this view"""
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parents:
diff changeset
   198
        self.req.set_content_type(self.content_type)
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diff changeset
   199
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   200
    # view utilities ##########################################################
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diff changeset
   201
    
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diff changeset
   202
    def view(self, __vid, rset, __fallback_vid=None, **kwargs):
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diff changeset
   203
        """shortcut to self.vreg.render method avoiding to pass self.req"""
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parents:
diff changeset
   204
        try:
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diff changeset
   205
            view = self.vreg.select_view(__vid, self.req, rset, **kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   206
        except NoSelectableObject:
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diff changeset
   207
            if __fallback_vid is None:
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parents:
diff changeset
   208
                raise
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parents:
diff changeset
   209
            view = self.vreg.select_view(__fallback_vid, self.req, rset, **kwargs)
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parents:
diff changeset
   210
        return view.dispatch(**kwargs)
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parents:
diff changeset
   211
    
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diff changeset
   212
    def wview(self, __vid, rset, __fallback_vid=None, **kwargs):
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parents:
diff changeset
   213
        """shortcut to self.view method automatically passing self.w as argument
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parents:
diff changeset
   214
        """
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parents:
diff changeset
   215
        self.view(__vid, rset, __fallback_vid, w=self.w, **kwargs)
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parents:
diff changeset
   216
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parents:
diff changeset
   217
    def whead(self, data):
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diff changeset
   218
        self.req.html_headers.write(data)
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parents:
diff changeset
   219
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parents:
diff changeset
   220
    def wdata(self, data):
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parents:
diff changeset
   221
        """simple helper that escapes `data` and writes into `self.w`"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   222
        self.w(html_escape(data))
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   223
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diff changeset
   224
    def action(self, actionid, row=0):
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parents:
diff changeset
   225
        """shortcut to get action object with id `actionid`"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   226
        return self.vreg.select_action(actionid, self.req, self.rset,
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parents:
diff changeset
   227
                                       row=row)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   228
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
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diff changeset
   229
    def action_url(self, actionid, label=None, row=0):
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parents:
diff changeset
   230
        """simple method to be able to display `actionid` as a link anywhere
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   231
        """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   232
        action = self.vreg.select_action(actionid, self.req, self.rset,
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   233
                                         row=row)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   234
        if action:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   235
            label = label or self.req._(action.title)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   236
            return u'<a href="%s">%s</a>' % (html_escape(action.url()), label)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   237
        return u''
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   238
    
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   239
    def html_headers(self):
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parents:
diff changeset
   240
        """return a list of html headers (eg something to be inserted between
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   241
        <head> and </head> of the returned page
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   242
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diff changeset
   243
        by default return a meta tag to disable robot indexation of the page
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   244
        """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   245
        return [NOINDEX]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   246
    
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   247
    def page_title(self):
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parents:
diff changeset
   248
        """returns a title according to the result set - used for the
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   249
        title in the HTML header
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   250
        """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   251
        vtitle = self.req.form.get('vtitle')
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   252
        if vtitle:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   253
            return self.req._(vtitle)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   254
        # class defined title will only be used if the resulting title doesn't
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   255
        # seem clear enough
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   256
        vtitle = getattr(self, 'title', None) or u''
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   257
        if vtitle:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   258
            vtitle = self.req._(vtitle)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   259
        rset = self.rset
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   260
        if rset and rset.rowcount:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   261
            if rset.rowcount == 1:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   262
                try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   263
                    entity = self.complete_entity(0)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   264
                    # use long_title to get context information if any
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
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   265
                    clabel = entity.dc_long_title()
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                except NotAnEntity:
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                    clabel = display_name(self.req, rset.description[0][0])
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                    clabel = u'%s (%s)' % (clabel, vtitle)
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            else :
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                etypes = rset.column_types(0)
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                if len(etypes) == 1:
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                    etype = iter(etypes).next()
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                    clabel = display_name(self.req, etype, 'plural')
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                else :
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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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# 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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    """
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    __registerer__ = accepts_registerer
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    __selectors__ = (accept_selector,)
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    category = 'entityview'
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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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class StartupView(View):
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    """base class for views which doesn't need a particular result set
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    to be displayed (so they can always be displayed !)
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    """
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    __registerer__ = priority_registerer
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    __selectors__ = (in_group_selector, norset_selector)
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    require_groups = ()
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    category = 'startupview'
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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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    __registerer__ = accepts_registerer
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    __selectors__ = (chainfirst(norset_selector, accept_selector),)
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    default_rql = None
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    def __init__(self, req, rset):
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        super(EntityStartupView, self).__init__(req, rset)
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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 executedif the result set is None"""
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   360
        return self.default_rql
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   361
    
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    def call(self, **kwargs):
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        """override call to execute rql returned by the .startup_rql
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   364
        method if necessary
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   365
        """
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   366
        if self.rset is None:
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   367
            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
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        are on a result set on which we do not apply.
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        """
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        if not self.__select__(self.req, self.rset):
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            return self.build_url(vid=self.id)
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   378
        return super(EntityStartupView, self).url()
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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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   383
    __registerer__ = priority_registerer
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   384
    __selectors__ = (anyrset_selector,)
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   385
    
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   386
    category = 'anyrsetview'
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   387
    
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   388
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   389
class EmptyRsetView(View):
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   390
    """base class for views applying on any empty result sets"""
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   391
    __registerer__ = priority_registerer
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   392
    __selectors__ = (emptyrset_selector,)
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   393
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   394
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   395
# concrete template base classes ##############################################
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   396
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   397
class Template(View):
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    """a template is almost like a view, except that by default a template
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parents:
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   399
    is only used globally (i.e. no result set adaptation)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
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diff changeset
   400
    """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   401
    __registry__ = 'templates'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   402
    __registerer__ = priority_registerer
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   403
    __selectors__ = (in_group_selector,)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   405
    require_groups = ()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   406
    
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parents:
diff changeset
   407
    def template(self, oid, **kwargs):
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parents:
diff changeset
   408
        """shortcut to self.registry.render method on the templates registry"""
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parents:
diff changeset
   409
        w = kwargs.pop('w', self.w)
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parents:
diff changeset
   410
        self.vreg.render('templates', oid, self.req, w=w, **kwargs)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
class MainTemplate(Template):
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parents:
diff changeset
   414
    """main template are primary access point to render a full HTML page.
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
    There is usually at least a regular main template and a simple fallback
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   416
    one to display error if the first one failed
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
    """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
    base_doctype = STRICT_DOCTYPE
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
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diff changeset
   421
    @property
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parents:
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   422
    def doctype(self):
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diff changeset
   423
        if self.req.xhtml_browser():
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   424
            return self.base_doctype % CW_XHTML_EXTENSIONS
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   425
        return self.base_doctype % ''
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
    def set_stream(self, w=None, templatable=True):
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parents:
diff changeset
   428
        if templatable and self.w is not None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   429
            return
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   430
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   431
        if w is None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   432
            if self.binary:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   433
                self._stream = stream = StringIO()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   434
            elif not templatable:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   435
                # not templatable means we're using a non-html view, we don't
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   436
                # want the HTMLStream stuff to interfere during data generation
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   437
                self._stream = stream = UStringIO()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   438
            else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   439
                self._stream = stream = HTMLStream(self.req)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
            w = stream.write
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   441
        else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   442
            stream = None
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
        self.w = w
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   444
        return stream
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   445
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   446
    def write_doctype(self, xmldecl=True):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   447
        assert isinstance(self._stream, HTMLStream)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
        self._stream.doctype = self.doctype
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   449
        if not xmldecl:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   450
            self._stream.xmldecl = u''
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   451
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
# viewable components base classes ############################################
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   453
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   454
class VComponent(ComponentMixIn, View):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   455
    """base class for displayable components"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   456
    property_defs = {
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   457
        'visible':  dict(type='Boolean', default=True,
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   458
                         help=_('display the component or not')),}
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   459
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   460
class SingletonVComponent(VComponent):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   461
    """base class for displayable unique components"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   462
    __registerer__ = priority_registerer