| author | sylvain.thenault@logilab.fr |
| Fri, 03 Apr 2009 19:04:00 +0200 | |
| changeset 1228 | 91ae10ffb611 |
| parent 962 | 1cc3c240b2d5 |
| child 985 | 6a25c58a1c23 |
| permissions | -rw-r--r-- |
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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), 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 (chainfirst, match_user_group, accept, |
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nonempty_rset, empty_rset, none_rset) |
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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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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' |
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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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called |
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""" |
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row, col = context.get('row'), context.get('col') |
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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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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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# should default .call() method add a <div classs="section"> around each |
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# rset item |
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add_div_section = True |
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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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Views applicable on None result sets have to override this method |
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""" |
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rset = self.rset |
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if rset is None: |
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raise NotImplementedError, self |
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wrap = self.templatable and len(rset) > 1 and self.add_div_section |
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for i in xrange(len(rset)): |
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if wrap: |
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self.w(u'<div class="section">') |
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self.wview(self.id, rset, row=i, **kwargs) |
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if wrap: |
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self.w(u"</div>") |
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def cell_call(self, row, col, **kwargs): |
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"""the view is called for a particular result set cell""" |
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raise NotImplementedError, self |
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def linkable(self): |
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"""return True if the view may be linked in a menu |
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by default views without title are not meant to be displayed |
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""" |
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if not getattr(self, 'title', None): |
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return False |
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return True |
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def is_primary(self): |
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return self.id == 'primary' |
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def url(self): |
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"""return the url associated with this view. Should not be |
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necessary for non linkable views, but a default implementation |
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is provided anyway. |
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""" |
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try: |
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return self.build_url(vid=self.id, rql=self.req.form['rql']) |
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except KeyError: |
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return self.build_url(vid=self.id) |
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def set_request_content_type(self): |
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"""set the content type returned by this view""" |
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self.req.set_content_type(self.content_type) |
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# view utilities ########################################################## |
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def view(self, __vid, rset, __fallback_vid=None, **kwargs): |
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"""shortcut to self.vreg.render method avoiding to pass self.req""" |
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try: |
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view = self.vreg.select_view(__vid, self.req, rset, **kwargs) |
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except NoSelectableObject: |
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if __fallback_vid is None: |
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raise |
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view = self.vreg.select_view(__fallback_vid, self.req, rset, **kwargs) |
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return view.dispatch(**kwargs) |
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def wview(self, __vid, rset, __fallback_vid=None, **kwargs): |
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"""shortcut to self.view method automatically passing self.w as argument |
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""" |
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self.view(__vid, rset, __fallback_vid, w=self.w, **kwargs) |
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def whead(self, data): |
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self.req.html_headers.write(data) |
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def wdata(self, data): |
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"""simple helper that escapes `data` and writes into `self.w`""" |
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self.w(html_escape(data)) |
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def action(self, actionid, row=0): |
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"""shortcut to get action object with id `actionid`""" |
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return self.vreg.select_action(actionid, self.req, self.rset, |
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row=row) |
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def action_url(self, actionid, label=None, row=0): |
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"""simple method to be able to display `actionid` as a link anywhere |
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""" |
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action = self.vreg.select_action(actionid, self.req, self.rset, |
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row=row) |
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if action: |
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label = label or self.req._(action.title) |
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return u'<a href="%s">%s</a>' % (html_escape(action.url()), label) |
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return u'' |
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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 return a meta tag to disable robot indexation of the page |
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""" |
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return [NOINDEX] |
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def page_title(self): |
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"""returns a title according to the result set - used for the |
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title in the HTML header |
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""" |
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vtitle = self.req.form.get('vtitle') |
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if vtitle: |
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return self.req._(vtitle) |
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# class defined title will only be used if the resulting title doesn't |
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# seem clear enough |
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vtitle = getattr(self, 'title', None) or u'' |
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if vtitle: |
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vtitle = self.req._(vtitle) |
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rset = self.rset |
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if rset and rset.rowcount: |
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if rset.rowcount == 1: |
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try: |
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entity = self.complete_entity(0) |
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# use long_title to get context information if any |
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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,) |
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accepts = ('Any',) |
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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): |
324 |
"""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__ = (match_user_group, none_rset) |
| 0 | 329 |
require_groups = () |
330 |
category = 'startupview' |
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def url(self): |
333 |
"""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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||
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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 |
|
339 |
||
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by default startup views are indexed |
|
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""" |
|
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return [] |
|
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||
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||
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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(none_rset, accept),) |
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default_rql = None |
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def __init__(self, req, rset): |
355 |
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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||
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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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return self.default_rql |
|
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def call(self, **kwargs): |
365 |
"""override call to execute rql returned by the .startup_rql |
|
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method if 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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||
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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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return super(EntityStartupView, self).url() |
|
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||
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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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__registerer__ = priority_registerer |
|
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__selectors__ = (nonempty_rset,) |
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| 0 | 388 |
category = 'anyrsetview' |
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|
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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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|
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else: |
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|
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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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|
401 |
for et in self.rset.column_types(colindex)) |
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|
402 |
else: |
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403 |
label = translate(self.req, attr) |
|
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changeset
|
404 |
labels.append(label) |
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|
405 |
return labels |
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parents:
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|
406 |
|
| 0 | 407 |
|
408 |
class EmptyRsetView(View): |
|
409 |
"""base class for views applying on any empty result sets""" |
|
410 |
__registerer__ = priority_registerer |
|
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411 |
__selectors__ = (empty_rset,) |
| 0 | 412 |
|
413 |
||
414 |
# concrete template base classes ############################################## |
|
415 |
||
416 |
class Template(View): |
|
417 |
"""a template is almost like a view, except that by default a template |
|
418 |
is only used globally (i.e. no result set adaptation) |
|
419 |
""" |
|
420 |
__registry__ = 'templates' |
|
421 |
__registerer__ = priority_registerer |
|
|
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parents:
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__selectors__ = (match_user_group,) |
| 0 | 423 |
|
424 |
require_groups = () |
|
|
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|
425 |
|
| 0 | 426 |
def template(self, oid, **kwargs): |
427 |
"""shortcut to self.registry.render method on the templates registry""" |
|
428 |
w = kwargs.pop('w', self.w) |
|
429 |
self.vreg.render('templates', oid, self.req, w=w, **kwargs) |
|
430 |
||
431 |
||
432 |
class MainTemplate(Template): |
|
433 |
"""main template are primary access point to render a full HTML page. |
|
434 |
There is usually at least a regular main template and a simple fallback |
|
435 |
one to display error if the first one failed |
|
436 |
""" |
|
437 |
||
438 |
base_doctype = STRICT_DOCTYPE |
|
439 |
||
440 |
@property |
|
441 |
def doctype(self): |
|
442 |
if self.req.xhtml_browser(): |
|
443 |
return self.base_doctype % CW_XHTML_EXTENSIONS |
|
444 |
return self.base_doctype % '' |
|
445 |
||
446 |
def set_stream(self, w=None, templatable=True): |
|
447 |
if templatable and self.w is not None: |
|
448 |
return |
|
449 |
||
450 |
if w is None: |
|
451 |
if self.binary: |
|
452 |
self._stream = stream = StringIO() |
|
453 |
elif not templatable: |
|
454 |
# not templatable means we're using a non-html view, we don't |
|
455 |
# want the HTMLStream stuff to interfere during data generation |
|
456 |
self._stream = stream = UStringIO() |
|
457 |
else: |
|
458 |
self._stream = stream = HTMLStream(self.req) |
|
459 |
w = stream.write |
|
460 |
else: |
|
461 |
stream = None |
|
462 |
self.w = w |
|
463 |
return stream |
|
464 |
||
465 |
def write_doctype(self, xmldecl=True): |
|
466 |
assert isinstance(self._stream, HTMLStream) |
|
467 |
self._stream.doctype = self.doctype |
|
468 |
if not xmldecl: |
|
469 |
self._stream.xmldecl = u'' |
|
470 |
||
471 |
# viewable components base classes ############################################ |
|
472 |
||
473 |
class VComponent(ComponentMixIn, View): |
|
474 |
"""base class for displayable components""" |
|
475 |
property_defs = { |
|
476 |
'visible': dict(type='Boolean', default=True, |
|
477 |
help=_('display the component or not')),} |
|
478 |
||
479 |
class SingletonVComponent(VComponent): |
|
480 |
"""base class for displayable unique components""" |
|
481 |
__registerer__ = priority_registerer |