web/views/timetable.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 15 Feb 2010 18:44:47 +0100
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backport stable
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"""html calendar views
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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from logilab.mtconverter import xml_escape
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from logilab.common.date import date_range, todatetime
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from cubicweb.interfaces import ITimetableViews
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from cubicweb.selectors import implements
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from cubicweb.view import AnyRsetView
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class _TaskEntry(object):
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    def __init__(self, task, color, column):
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        self.task = task
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        self.color = color
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        self.column = column
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        self.lines = 1
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MIN_COLS = 3  # minimum number of task columns for a single user
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ALL_USERS = object()
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class TimeTableView(AnyRsetView):
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    __regid__ = 'timetable'
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    title = _('timetable')
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    __select__ = implements(ITimetableViews)
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    paginable = False
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    def call(self, title=None):
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        """Dumps a timetable from a resultset composed of a note (anything
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        with start/stop) and a user (anything)"""
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        self._cw.add_css('cubicweb.timetable.css')
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        dates = {}
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        users = []
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        users_max = {}
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        # XXX: try refactoring with calendar.py:OneMonthCal
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        for row in xrange(self.cw_rset.rowcount):
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            task = self.cw_rset.get_entity(row, 0)
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            if len(self.cw_rset[row]) > 1:
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                user = self.cw_rset.get_entity(row, 1)
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            else:
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                user = ALL_USERS
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            the_dates = []
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            if task.start and task.stop:
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                if task.start.toordinal() == task.stop.toordinal():
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                    the_dates.append(task.start)
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                else:
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                    the_dates += date_range( task.start, task.stop )
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            elif task.start:
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                the_dates.append(task.start)
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            elif task.stop:
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                the_dates.append(task.stop)
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            for d in the_dates:
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                d = todatetime(d)
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                d_users = dates.setdefault(d, {})
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                u_tasks = d_users.setdefault(user, set())
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                u_tasks.add( task )
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                task_max = users_max.setdefault(user, 0)
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                if len(u_tasks)>task_max:
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                    users_max[user] = len(u_tasks)
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            if user not in users:
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                # keep original ordering
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                users.append(user)
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        if not dates:
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            return
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        date_min = min(dates)
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        date_max = max(dates)
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        #users = list(sorted(users, key=lambda u:u.login))
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        rows = []
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        # colors here are class names defined in cubicweb.css
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        colors = ["col%x" % i for i in xrange(12)]
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        next_color_index = 0
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        visited_tasks = {} # holds a description of a task for a user
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        task_colors = {}   # remember a color assigned to a task
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        for date in date_range(date_min, date_max):
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            columns = [date]
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            d_users = dates.get(date, {})
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            for user in users:
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                # every user has its column "splitted" in at least MIN_COLS
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                # sub-columns (for overlapping tasks)
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                user_columns = [None] * max(MIN_COLS, users_max[user])
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                # every task that is "visited" for the first time
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                # require a special treatment, so we put them in
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                # 'postpone'
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                postpone = []
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                for task in d_users.get(user, []):
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                    key = (task, user)
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                    if key in visited_tasks:
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                        task_descr = visited_tasks[ key ]
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                        user_columns[task_descr.column] = task_descr, False
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                        task_descr.lines += 1
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                    else:
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                        postpone.append(key)
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                for key in postpone:
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                    # to every 'new' task we must affect a color
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                    # (which must be the same for every user concerned
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                    # by the task)
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                    task, user = key
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                    for i, t in enumerate(user_columns):
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                        if t is None:
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                            if task in task_colors:
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                                color = task_colors[task]
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                            else:
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                                color = colors[next_color_index]
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                                next_color_index = (next_color_index+1)%len(colors)
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                                task_colors[task] = color
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                            task_descr = _TaskEntry(task, color, i)
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                            user_columns[i] = task_descr, True
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                            visited_tasks[key] = task_descr
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                            break
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                    else:
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                        raise RuntimeError("is it possible we got it wrong?")
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                columns.append( user_columns )
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            rows.append( columns )
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        widths = [ len(col) for col in rows[0][1:] ]
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        self.w(u'<div class="section">')
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        if title:
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            self.w(u'<h4>%s</h4>\n' % title)
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        self.w(u'<table class="listing timetable">')
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        self.render_col_headers(users, widths)
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        self.render_rows(rows)
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        self.w(u'</table>')
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        self.w(u'</div>\n')
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    def render_col_headers(self, users, widths):
0
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        """ render column headers """
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        self.w(u'<tr class="header">\n')
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        self.w(u'<th class="ttdate">&#160;</th>\n')
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        columns = []
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        for user, width in zip(users, widths):
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            self.w(u'<th colspan="%s">' % max(MIN_COLS, width))
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            if user is ALL_USERS:
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                self.w(u'*')
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            else:
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                user.view('oneline', w=self.w)
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            self.w(u'</th>')
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        self.w(u'</tr>\n')
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        return columns
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    def render_rows(self, rows):
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        """ render table content (row headers and central content) """
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        odd = False
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        previous_is_empty = False
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        for row in rows:
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            date = row[0]
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            empty_line = True
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            for group in row[1:]:
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                for value in group:
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                    if value:
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                        empty_line = False
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                        break
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                else:
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                    continue
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                break
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            if empty_line and previous_is_empty:
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                continue
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            previous_is_empty = False
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            klass = "even"
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            if date.weekday() in (5, 6) and not empty_line:
0
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                klass = "odd"
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            self.w(u'<tr class="%s">' % klass)
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            odd = not odd
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            if not empty_line:
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                self.w(u'<th class="ttdate">%s</th>' % self._cw.format_date(date) )
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            else:
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                self.w(u'<th>...</th>'  )
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                previous_is_empty = True
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            empty_klasses = [ "ttle", "ttme", "ttre" ]
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            filled_klasses = [ "ttlf", "ttmf", "ttrf" ]
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            kj = 0 # 0: left, 1: mid, 2: right
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            for uid, group in enumerate(row[1:]):
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                for i, value in enumerate(group):
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                    if i == 0:
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                        kj = 0
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                    elif i == len(group):
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                        kj = 2
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                    else:
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                        kj = 1
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                    if value:
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                        task_descr, first_row = value
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                        if first_row:
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                            url = xml_escape(task_descr.task.absolute_url(vid="edition"))
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                            self.w(u'<td rowspan="%d" class="%s %s" onclick="document.location=\'%s\'">&#160;<div>' % (
0
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                                task_descr.lines, task_descr.color, filled_klasses[kj], url))
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                            task_descr.task.view('tooltip', w=self.w)
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                            self.w(u'</div></td>')
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                    else:
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                        if empty_line:
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                            self.w(u'<td class="ttempty">&#160;</td>')
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                        else:
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                            self.w(u'<td class="%s">&#160;</td>' % empty_klasses[kj] )
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            self.w(u'</tr>\n')