kpsul/gestioncof/widgets.py

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from django.forms.widgets import Widget
from django.forms.utils import flatatt
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from django.utils.safestring import mark_safe
class TriStateCheckbox(Widget):
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def __init__(self, attrs=None, choices=()):
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super().__init__(attrs)
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# choices can be any iterable, but we may need to render this widget
# multiple times. Thus, collapse it into a list so it can be consumed
# more than once.
self.choices = list(choices)
def render(self, name, value, attrs=None, choices=()):
if value is None:
value = 'none'
attrs['value'] = value
final_attrs = self.build_attrs(self.attrs, attrs)
output = ["<span class=\"tristate\"%s></span>" % flatatt(final_attrs)]
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return mark_safe('\n'.join(output))