OpenSlides/openslides/projector/projector.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
    openslides.projector.projector
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Slide functions for the projector app.

    :copyright: 2011, 2012 by OpenSlides team, see AUTHORS.
    :license: GNU GPL, see LICENSE for more details.
"""

from time import time

from django.dispatch import receiver
from django.template.loader import render_to_string

from openslides.config.models import config

from openslides.projector.signals import projector_overlays


SLIDE = {}

class SlideMixin(object):
    """
    A Mixin for a Django-Model, for making the model a slide.
    """

    def slide(self):
        """
        Return a map with all Data for the Slide.
        """
        return {
            'slide': self,
            'title': 'dummy-title',
            'template': 'projector/default.html',
        }

    @property
    def sid(self):
        """
        Return the sid from this Slide
        """
        return "%s-%d" % (self.prefix, self.id)

    @property
    def active(self):
        """
        Return True, if the the slide is the active slide.
        """
        from api import get_active_slide
        return get_active_slide(only_sid=True) == self.sid

    def set_active(self):
        """
        Appoint this item as the active slide.
        """
        set_active_slide(self.sid)

    def save(self, *args, **kwargs):
        if self.active:
            from api import clear_projector_cache
            clear_projector_cache()
        return super(SlideMixin, self).save(*args, **kwargs)


class Slide(object):
    """
    Represents a Slide for the projector. Can be a modelinstanz, or a function.
    """
    def __init__(self, model_slide=False, func=None, model=None, category=None,
                 key=None, model_name='', control_template='', weight=0, name=''):
        """
        model_slide: Boolean if the value is a Model.
        func: The function to call. Only if modelslide is False.
        model: The model. Only if modelslide is True.
        model_name: The name shown for the model.
        category: The category to show this Slide.
        key: the key in the slide object to find itself.
        """
        self.model_slide = model_slide
        self.func = func
        self.model = model
        self.model_name = model_name
        self.category = category
        self.key = key
        self.control_template = control_template
        self.weight = weight
        self.name = name

    @property
    def active(self):
        """
        Return True if the Slide is active, else: False.
        """
        from api import get_active_slide
        return get_active_slide(True) == self.key

    def get_items(self):
        """
        If the Slide is a Slide from a Model, return all Objects.
        """
        try:
            return self.model.objects.all()
        except AttributeError:
            return 'No Model'


class Widget(object):
    """
    Class for a Widget for the Projector-Tab.
    """
    def __init__(self, name, html=None, template=None, context={},
            permission_required=None, display_name=None, default_column=1):
        self.name = name
        if display_name is None:
            self.display_name = name.capitalize()
        else:
            self.display_name = display_name

        if html is not None:
            self.html = html
        elif template is not None:
            self.html = render_to_string(template, context)

        self.permission_required = permission_required
        self.default_column = default_column

    def get_name(self):
        return self.name.lower()

    def get_html(self):
        return self.html

    def get_title(self):
        return self.display_name

    def __repr__(self):
        return unicode(self.display_name)

    def __unicode__(self):
        return unicode(self.display_name)


@receiver(projector_overlays, dispatch_uid="projector_countdown")
def countdown(sender, **kwargs):
    name = 'Countdown'
    if kwargs['register']:
        return name
    if name in kwargs['call']:
        if config['countdown_state'] == 'active':
            seconds = max(0, int(config['countdown_start_stamp'] + config['countdown_time'] - time()))
        elif config['countdown_state'] == 'paused':
            seconds = max(0, int(config['countdown_start_stamp'] + config['countdown_time'] - config['countdown_pause_stamp']))
        elif config['countdown_state'] == 'inactive':
            seconds = max(0, int(config['countdown_time']))
        else:
            seconds = 0

        if seconds == 0:
            config['countdown_state'] = 'expired'

        return (name, '%02d:%02d' % (seconds / 60, seconds % 60))
    return None


@receiver(projector_overlays, dispatch_uid="projector_message")
def projector_message(sender, **kwargs):
    name = 'Message'
    if kwargs['register']:
        return name
    if name in kwargs['call']:
        message = config['projector_message']
        if message != '':
            return (name, message)
    return None