web/views/navigation.py
author katia
Mon, 21 Jun 2010 16:13:41 +0200
changeset 5819 1017163825c7
parent 5627 a7e40cccdc9b
child 5895 6a3f776292a5
permissions -rw-r--r--
[css] more css rework, need visual test in compat/new modes
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# copyright 2003-2010 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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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""navigation components definition for CubicWeb web client"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from rql.nodes import VariableRef, Constant
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from logilab.mtconverter import xml_escape
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from logilab.common.deprecation import deprecated
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from cubicweb.selectors import (paginated_rset, sorted_rset,
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                                adaptable, implements)
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from cubicweb.uilib import cut
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from cubicweb.view import EntityAdapter, implements_adapter_compat
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from cubicweb.web.component import EntityVComponent, NavigationComponent
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class PageNavigation(NavigationComponent):
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    def call(self):
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        """displays a resultset by page"""
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        params = dict(self._cw.form)
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        self.clean_params(params)
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        basepath = self._cw.relative_path(includeparams=False)
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        self.w(u'<div class="pagination">')
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        self.w(u'%s&#160;' % self.previous_link(basepath, params))
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        self.w(u'[&#160;%s&#160;]' %
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               u'&#160;| '.join(self.iter_page_links(basepath, params)))
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        self.w(u'&#160;%s' % self.next_link(basepath, params))
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        self.w(u'</div>')
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    def index_display(self, start, stop):
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        return u'%s - %s' % (start+1, stop+1)
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    def iter_page_links(self, basepath, params):
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        rset = self.cw_rset
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        page_size = self.page_size
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        start = 0
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        while start < rset.rowcount:
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            stop = min(start + page_size - 1, rset.rowcount - 1)
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            yield self.page_link(basepath, params, start, stop,
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                                 self.index_display(start, stop))
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            start = stop + 1
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class PageNavigationSelect(PageNavigation):
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    """displays a resultset by page as PageNavigationSelect but in a <select>,
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    better when there are a lot of results.
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    """
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    __select__ = paginated_rset(4)
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    page_link_templ = u'<option value="%s" title="%s">%s</option>'
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    selected_page_link_templ = u'<option value="%s" selected="selected" title="%s">%s</option>'
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    def call(self):
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        params = dict(self._cw.form)
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        self.clean_params(params)
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        basepath = self._cw.relative_path(includeparams=False)
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        w = self.w
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        w(u'<div class="pagination">')
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        w(u'%s&#160;' % self.previous_link(basepath, params))
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        w(u'<select onchange="javascript: document.location=this.options[this.selectedIndex].value">')
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        for option in self.iter_page_links(basepath, params):
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            w(option)
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        w(u'</select>')
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        w(u'&#160;%s' % self.next_link(basepath, params))
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        w(u'</div>')
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class SortedNavigation(NavigationComponent):
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    """sorted navigation apply if navigation is needed (according to page size)
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    and if the result set is sorted
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    """
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    __select__ = paginated_rset() & sorted_rset()
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    # number of considered chars to build page links
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    nb_chars = 5
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    def display_func(self, rset, col, attrname):
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        if attrname is not None:
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            def index_display(row):
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                if not rset[row][col]: # outer join
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                    return u''
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                entity = rset.get_entity(row, col)
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                return entity.printable_value(attrname, format='text/plain')
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        elif self._cw.vreg.schema.eschema(rset.description[0][col]).final:
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            def index_display(row):
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                return unicode(rset[row][col])
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        else:
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            def index_display(row):
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                return rset.get_entity(row, col).view('text')
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        return index_display
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    def call(self):
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        """displays links to navigate accross pages of a result set
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   112
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        Displayed result is done according to a variable on which the sort
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        is done, and looks like:
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        [ana - cro] | [cro - ghe] | ... | [tim - zou]
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        """
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        w = self.w
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        rset = self.cw_rset
0
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        page_size = self.page_size
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        rschema = self._cw.vreg.schema.rschema
0
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        # attrname = the name of attribute according to which the sort
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        # is done if any
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        for sorterm in rset.syntax_tree().children[0].orderby:
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            if isinstance(sorterm.term, Constant):
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                col = sorterm.term.value - 1
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                index_display = self.display_func(rset, col, None)
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                break
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            var = sorterm.term.get_nodes(VariableRef)[0].variable
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            col = None
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            for ref in var.references():
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                rel = ref.relation()
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                if rel is None:
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                    continue
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                attrname = rel.r_type
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                if attrname == 'is':
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                    continue
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                if not rschema(attrname).final:
0
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                    col = var.selected_index()
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                    attrname = None
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                if col is None:
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                    # final relation or not selected non final relation
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                    if var is rel.children[0]:
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                        relvar = rel.children[1].children[0].get_nodes(VariableRef)[0]
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                    else:
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                        relvar = rel.children[0].variable
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                    col = relvar.selected_index()
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                if col is not None:
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                    break
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            else:
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                # no relation but maybe usable anyway if selected
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                col = var.selected_index()
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                attrname = None
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            if col is not None:
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                index_display = self.display_func(rset, col, attrname)
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                break
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   156
        else:
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            # nothing usable found, use the first column
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   158
            index_display = self.display_func(rset, 0, None)
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   159
        blocklist = []
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        params = dict(self._cw.form)
0
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        self.clean_params(params)
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        start = 0
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        basepath = self._cw.relative_path(includeparams=False)
0
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   164
        while start < rset.rowcount:
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            stop = min(start + page_size - 1, rset.rowcount - 1)
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            cell = self.format_link_content(index_display(start), index_display(stop))
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   167
            blocklist.append(self.page_link(basepath, params, start, stop, cell))
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            start = stop + 1
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   169
        self.write_links(basepath, params, blocklist)
0
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    def format_link_content(self, startstr, stopstr):
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        text = u'%s - %s' % (startstr.lower()[:self.nb_chars],
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                             stopstr.lower()[:self.nb_chars])
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   174
        return xml_escape(text)
0
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   176
    def write_links(self, basepath, params, blocklist):
0
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        self.w(u'<div class="pagination">')
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   178
        self.w(u'%s&#160;' % self.previous_link(basepath, params))
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   179
        self.w(u'[&#160;%s&#160;]' % u'&#160;| '.join(blocklist))
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        self.w(u'&#160;%s' % self.next_link(basepath, params))
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        self.w(u'</div>')
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   184
from cubicweb.interfaces import IPrevNext
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   185
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   186
class IPrevNextAdapter(EntityAdapter):
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   187
    """interface for entities which can be linked to a previous and/or next
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   188
    entity
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   189
    """
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    __regid__ = 'IPrevNext'
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   191
    __select__ = implements(IPrevNext) # XXX for bw compat, else should be abstract
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   192
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   193
    @implements_adapter_compat('IPrevNext')
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   194
    def next_entity(self):
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   195
        """return the 'next' entity"""
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   196
        raise NotImplementedError
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   197
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   198
    @implements_adapter_compat('IPrevNext')
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   199
    def previous_entity(self):
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   200
        """return the 'previous' entity"""
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   201
        raise NotImplementedError
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   203
0
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class NextPrevNavigationComponent(EntityVComponent):
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   205
    __regid__ = 'prevnext'
0
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   206
    # register msg not generated since no entity implements IPrevNext in cubicweb
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    # itself
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    title = _('contentnavigation_prevnext')
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   209
    help = _('contentnavigation_prevnext_description')
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    __select__ = (EntityVComponent.__select__
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   211
                  & adaptable('IPrevNext'))
0
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    context = 'navbottom'
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    order = 10
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    def call(self, view=None):
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diff changeset
   215
        entity = self.cw_rset.get_entity(0, 0)
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   216
        adapter = entity.cw_adapt_to('IPrevNext')
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   217
        previous = adapter.previous_entity()
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        next = adapter.next_entity()
0
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        if previous or next:
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   220
            textsize = self._cw.property_value('navigation.short-line-size')
0
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   221
            self.w(u'<div class="prevnext">')
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   222
            if previous:
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                self.w(u'<div class="previousEntity left">')
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                self.w(self.previous_link(previous, textsize))
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                self.w(u'</div>')
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   226
                self._cw.html_headers.add_raw('<link rel="prev" href="%s" />'
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diff changeset
   227
                                              % xml_escape(previous.absolute_url()))
0
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   228
            if next:
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                self.w(u'<div class="nextEntity right">')
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                self.w(self.next_link(next, textsize))
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                self.w(u'</div>')
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                self._cw.html_headers.add_raw('<link rel="next" href="%s" />'
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                                              % xml_escape(next.absolute_url()))
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            self.w(u'</div>')
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            self.w(u'<div class="clear"></div>')
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    def previous_link(self, previous, textsize):
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        return u'<a href="%s" title="%s">&lt;&lt; %s</a>' % (
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            xml_escape(previous.absolute_url()),
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            self._cw._('i18nprevnext_previous'),
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            xml_escape(cut(previous.dc_title(), textsize)))
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    def next_link(self, next, textsize):
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        return u'<a href="%s" title="%s">%s &gt;&gt;</a>' % (
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            xml_escape(next.absolute_url()),
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            self._cw._('i18nprevnext_next'),
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            xml_escape(cut(next.dc_title(), textsize)))
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def do_paginate(view, rset=None, w=None, show_all_option=True, page_size=None):
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    """write pages index in w stream (default to view.w) and then limit the result
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    set (default to view.rset) to the currently displayed page
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    """
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    req = view._cw
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    if rset is None:
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        rset = view.cw_rset
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    if w is None:
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        w = view.w
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    nav = req.vreg['components'].select_or_none(
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        'navigation', req, rset=rset, page_size=page_size, view=view)
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    if nav:
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        if w is None:
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            w = view.w
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        # get boundaries before component rendering
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        start, stop = nav.page_boundaries()
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        nav.render(w=w)
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        params = dict(req.form)
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        nav.clean_params(params)
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        # make a link to see them all
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        if show_all_option:
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            url = xml_escape(req.build_url(__force_display=1, **params))
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            w(u'<div><a href="%s">%s</a></div>\n'
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              % (url, req._('show %s results') % len(rset)))
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        rset.limit(offset=start, limit=stop-start, inplace=True)
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def paginate(view, show_all_option=True, w=None, page_size=None, rset=None):
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    """paginate results if the view is paginable and we're not explictly told to
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    display everything (by setting __force_display in req.form)
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    """
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    if view.paginable and not view._cw.form.get('__force_display'):
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        do_paginate(view, rset, w, show_all_option, page_size)
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# monkey patch base View class to add a .paginate([...])
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# method to be called to write pages index in the view and then limit the result
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# set to the current page
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from cubicweb.view import View
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View.do_paginate = do_paginate
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View.paginate = paginate
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#@deprecated (see below)
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def limit_rset_using_paged_nav(self, req, rset, w, forcedisplay=False,
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                               show_all_option=True, page_size=None):
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    if not (forcedisplay or req.form.get('__force_display') is not None):
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        do_paginate(self, rset, w, show_all_option, page_size)
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View.pagination = deprecated('[3.2] .pagination is deprecated, use paginate')(
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    limit_rset_using_paged_nav)
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limit_rset_using_paged_nav = deprecated('[3.6] limit_rset_using_paged_nav is deprecated, use do_paginate')(
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    limit_rset_using_paged_nav)