def render_widget(widget_instance):
""" Django custom template tag used to render widgets.
The rendering is done using the template defined in the
associated widget type. If the widget type implements
get_context_data then that is used to generate the
template context.
"""
widget = None
# Get settings, if any
if widget_instance.settings:
settings = widget_instance.settings
else:
settings = {}
# Get widget
try:
widget = get_widget(widget_instance.widget_type)
except MissingWidgetType:
template_name = 'dashboard/widget-error.html'
context = {}
context['error'] = _('Unknown widget type %(widget_type)s') % {
'widget_type': widget_instance.widget_type
}
context['empty_type'] = widget_instance.widget_type
if widget:
# Get template
try:
template_name = widget.template_name
except AttributeError:
template_name = 'dashboard/widget-error.html'
context = {}
context['error'] = _('Missing template for %(widget_type)s') % {
'widget_type': widget_instance.widget_type
}
widget = None
if widget:
# Get context
try:
context = widget.get_context_data(**settings)
except AttributeError:
context = {}
except WidgetError as e:
template_name = 'dashboard/widget-error.html'
context = {}
context['error'] = str(e)
except Exception as e:
logger.exception('Error while fetching widget context data: %s', e)
template_name = 'dashboard/widget-error.html'
context = {}
context['error'] = _('Widget error. See error logs.')
return render_to_string(template_name, context)
def get_context_data(self, **kwargs):
""" Get the list of widgets for this dashboard, and organise them
in row/columns to be displayed by the template.
"""
context = super(DashboardView, self).get_context_data(**kwargs) or {}
# Get dashboard
if 'name' in self.kwargs and self.kwargs['name']:
name = self.kwargs['name']
else:
name = 'main'
dashboard = Dashboard.objects.get(name=name)
context['name'] = dashboard.name
# Get widgets and sort them by row
widgets = dashboard.widgetinstance_set.all().order_by('row', 'column')
context['rows'] = []
current_row = []
current_row_number = None
for widget in widgets:
if current_row_number is None:
current_row_number = widget.row
elif current_row_number != widget.row:
context['rows'].append(current_row)
current_row_number = widget.row
current_row = []
current_row.append(widget)
if len(current_row) > 0:
context['rows'].append(current_row)
# Ensure we have all the javascript & css dependencies
require_assets('dashboard/dashboard.css')
for widget in widgets:
try:
widget_type = get_widget(widget.widget_type)
except MissingWidgetType:
continue
if hasattr(widget_type, 'javascript'):
require_assets(*widget_type.javascript)
if hasattr(widget_type, 'css'):
require_assets(*widget_type.css)
# Return the context
return context
def test_registering_twice_overrides_existing_widget(self):
test_widget = TestWidget()
register_widget('test-widget', test_widget)
test_widget_2 = TestWidget()
register_widget('test-widget', test_widget_2)
self.assertEqual(get_widget('test-widget'), test_widget_2)
def test_widget_is_registered(self):
test_widget = TestWidget()
register_widget('test-widget', test_widget)
self.assertEqual(get_widget('test-widget'), test_widget)