257 lines
7.1 KiB
Python
257 lines
7.1 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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openslides.projector.api
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~~~~~~~~~~~~~~~~~~~~~~~~
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Useful functions for the projector app.
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:copyright: 2011, 2012 by OpenSlides team, see AUTHORS.
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:license: GNU GPL, see LICENSE for more details.
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"""
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from time import time
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from django.conf import settings
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from django.template.loader import render_to_string
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from django.utils.datastructures import SortedDict
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from django.utils.importlib import import_module
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from openslides.config.api import config
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from openslides.utils.tornado_webserver import ProjectorSocketHandler
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from .signals import projector_overlays
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slide_callback = {}
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"""
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A dictonary where the key is the name of a slide, and the value is a
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callable object which returns the html code for a slide.
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"""
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def update_projector():
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"""
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Sends the data to the clients, who listen to the projector.
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"""
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# TODO: only send necessary html
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ProjectorSocketHandler.send_updates({'content': get_projector_content()})
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def update_projector_overlay(overlay):
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"""
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Update one or all overlay on the projector.
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Checks if the overlay is activated and updates it in this case.
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The argument 'overlay' has to be an overlay object, the name of a
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ovleray or None. If it is None, all overlays will be updated.
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"""
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if overlay is None:
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overlays = [item for item in get_overlays().values()]
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elif isinstance(overlay, basestring):
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overlays = [get_overlays()[overlay]]
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else:
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overlays = [overlay]
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overlay_dict = {}
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for overlay in overlays:
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if overlay.is_active():
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overlay_dict[overlay.name] = {
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'html': overlay.get_projector_html(),
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'javascript': overlay.get_javascript()}
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else:
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overlay_dict[overlay.name] = None
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ProjectorSocketHandler.send_updates({'overlays': overlay_dict})
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def call_on_projector(calls):
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"""
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Sends data to the projector.
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"""
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projector_js_cache = config['projector_js_cache']
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projector_js_cache.update(calls)
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config['projector_js_cache'] = projector_js_cache
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ProjectorSocketHandler.send_updates({'calls': calls})
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def get_projector_content(slide_dict=None):
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"""
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Returns the HTML-Content block of the projector.
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"""
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if slide_dict is None:
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slide_dict = config['projector_active_slide'].copy()
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callback = slide_dict.pop('callback', None)
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try:
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return slide_callback[callback](**slide_dict)
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except KeyError:
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return default_slide()
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def default_slide():
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"""
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Returns the HTML Code for the default slide.
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"""
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return render_to_string('projector/default_slide.html')
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def get_overlays():
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"""
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Returns all overlay objects.
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The returned value is a dictonary with the name of the overlay as key, and
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the overlay object as value.
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"""
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overlays = {}
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for receiver, overlay in projector_overlays.send(sender='get_overlays'):
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overlays[overlay.name] = overlay
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return overlays
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def get_projector_overlays():
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"""
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Returns the HTML code for all active overlays.
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"""
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overlays = [{'name': key, 'html': overlay.get_projector_html()}
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for key, overlay in get_overlays().items()
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if overlay.is_active()]
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return render_to_string('projector/all_overlays.html', {'overlays': overlays})
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def get_projector_overlays_js():
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"""
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Returns JS-Code for the overlays.
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The retuned value is a list of json objects.
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"""
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javascript = []
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for overlay in get_overlays().values():
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if overlay.is_active():
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overlay_js = overlay.get_javascript()
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if overlay_js:
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javascript.append(overlay_js)
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return javascript
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def register_slide(name, callback):
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"""
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Register a function as slide callback.
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"""
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slide_callback[name] = callback
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def register_slide_model(SlideModel, template):
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"""
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Shortcut for register_slide for a Model with the SlideMixin.
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The Argument 'SlideModel' has to be a Django-Model-Class, which is a subclass
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of SlideMixin. Template has to be a string to the path of a template.
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"""
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def model_slide(**kwargs):
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"""
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Return the html code for the model slide.
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"""
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slide_pk = kwargs.get('pk', None)
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try:
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slide = SlideModel.objects.get(pk=slide_pk)
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except SlideModel.DoesNotExist:
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slide = None
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context = {'slide': None}
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else:
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context = slide.get_slide_context()
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return render_to_string(template, context)
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register_slide(SlideModel.slide_callback_name, model_slide)
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def set_active_slide(callback, kwargs=None):
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"""
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Set the active Slide.
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callback: The name of the slide callback.
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kwargs: Keyword arguments for the slide callback.
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"""
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kwargs = kwargs or {}
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kwargs.update(callback=callback)
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config['projector_active_slide'] = kwargs
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update_projector()
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update_projector_overlay(None)
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def get_active_slide():
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"""
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Returns the dictonary, which defines the active slide.
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"""
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return config['projector_active_slide']
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def get_all_widgets(request, session=False):
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"""
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Collects the widgets from all apps and returns the Widget objects as sorted
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dictionary.
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The session flag decides whether to return only the widgets which are
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active, that means that they are mentioned in the session.
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"""
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all_module_widgets = []
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for app in settings.INSTALLED_APPS:
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try:
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mod = import_module(app + '.views')
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except ImportError:
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continue
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try:
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mod_get_widgets = mod.get_widgets
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except AttributeError:
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continue
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else:
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module_widgets = mod_get_widgets(request)
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all_module_widgets.extend(module_widgets)
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all_module_widgets.sort(key=lambda widget: widget.default_weight)
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session_widgets = request.session.get('widgets', {})
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widgets = SortedDict()
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for widget in all_module_widgets:
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if (widget.permission_required is None or
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request.user.has_perm(widget.permission_required)):
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if not session or session_widgets.get(widget.get_name(), True):
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widgets[widget.get_name()] = widget
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return widgets
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def start_countdown():
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"""
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Starts the countdown
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"""
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# if we had stopped the countdown resume were we left of
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if config['countdown_state'] == 'paused':
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start_stamp = config['countdown_start_stamp']
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pause_stamp = config['countdown_pause_stamp']
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now = time()
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config['countdown_start_stamp'] = now - \
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(pause_stamp - start_stamp)
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else:
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config['countdown_start_stamp'] = time()
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config['countdown_state'] = 'active'
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config['countdown_pause_stamp'] = 0
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def stop_countdown():
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"""
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Stops the countdown
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"""
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if config['countdown_state'] == 'active':
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config['countdown_state'] = 'paused'
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config['countdown_pause_stamp'] = time()
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def reset_countdown():
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"""
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Resets the countdown
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"""
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config['countdown_start_stamp'] = time()
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config['countdown_pause_stamp'] = 0
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config['countdown_state'] = 'inactive'
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