OpenSlides/openslides/projector/models.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
openslides.projector.models
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Models for the projector app.
:copyright: 20112013 by OpenSlides team, see AUTHORS.
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:license: GNU GPL, see LICENSE for more details.
"""
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from django.db import models
from django.dispatch import receiver
from django.utils.translation import ugettext_lazy, ugettext_noop
from django.core.exceptions import ImproperlyConfigured
from django.core.urlresolvers import reverse
from openslides.utils.utils import int_or_none
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class RelatedModelMixin(object):
"""
Mixin for motion related models, that appear on the motion slide.
"""
def save(self, *args, **kwargs):
"""
Saves the model and updates the projector, if the motion in on it.
"""
from .api import update_projector
value = super(RelatedModelMixin, self).save(*args, **kwargs)
if self.get_related_model().is_active_slide():
update_projector()
return value
def delete(self, *args, **kwargs):
"""
Deletes the model and updates the projector, if the motion in on it.
"""
from .api import update_projector
value = super(RelatedModelMixin, self).delete(*args, **kwargs)
if self.get_related_model().is_active_slide():
update_projector()
return value
def get_related_model(self):
"""
Return the pk of the related model.
"""
raise ImproperlyConfigured(
'%s has to have a method "get_related_model_pk"' % type(self))
class SlideMixin(object):
"""
A Mixin for a Django-Model, for making the model a slide.
"""
slide_callback_name = None
"""
Name of the callback to render the model as slide.
"""
def save(self, *args, **kwargs):
"""
Updates the projector, if 'self' is the active slide.
"""
from openslides.projector.api import update_projector
value = super(SlideMixin, self).save(*args, **kwargs)
if self.is_active_slide():
update_projector()
return value
def delete(self, *args, **kwargs):
from openslides.projector.api import update_projector
value = super(SlideMixin, self).delete(*args, **kwargs)
if self.is_active_slide():
update_projector()
return value
def get_absolute_url(self, link='projector'):
"""
Return the url to activate the slide, if link == 'projector'.
"""
if link in ('projector', 'projector_preview'):
url_name = {'projector': 'projector_activate_slide',
'projector_preview': 'projector_preview'}[link]
value = '%s?pk=%d' % (
reverse(url_name,
args=[self.slide_callback_name]),
self.pk)
else:
value = super(SlideMixin, self).get_absolute_url(link)
return value
def is_active_slide(self):
"""
Return True, if the the slide is the active slide.
"""
from openslides.projector.api import get_active_slide
active_slide = get_active_slide()
pk = int_or_none(active_slide.get('pk', None))
return (active_slide['callback'] == self.slide_callback_name and
self.pk == pk)
def get_slide_context(self, **context):
"""
Returns the context for the template which renders the slide.
"""
slide_name = self._meta.object_name.lower()
context.update({'slide': self,
slide_name: self})
return context
class ProjectorSlide(SlideMixin, models.Model):
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"""
Model for Slides, only for the projector. Also called custom slides.
"""
# TODO: Rename it to CustomSlide
slide_callback_name = 'projector_slide'
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title = models.CharField(max_length=256, verbose_name=ugettext_lazy("Title"))
text = models.TextField(null=True, blank=True, verbose_name=ugettext_lazy("Text"))
weight = models.IntegerField(default=0, verbose_name=ugettext_lazy("Weight"))
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def get_absolute_url(self, link='update'):
if link == 'edit' or link == 'update':
return reverse('customslide_edit', args=[str(self.pk)])
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if link == 'delete':
return reverse('customslide_delete', args=[str(self.pk)])
return super(ProjectorSlide, self).get_absolute_url(link)
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def __unicode__(self):
return self.title
class Meta:
permissions = (
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('can_manage_projector', ugettext_noop("Can manage the projector")),
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('can_see_projector', ugettext_noop("Can see the projector")),
('can_see_dashboard', ugettext_noop("Can see the dashboard")),
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)