48 lines
1.7 KiB
Python
48 lines
1.7 KiB
Python
from django import forms
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from django.core import validators
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class LatLonWidget(forms.MultiWidget):
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"""
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A Widget that splits Point input into two latitude/longitude boxes.
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"""
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def __init__(self, attrs=None, date_format=None, time_format=None):
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widgets = (forms.TextInput(attrs=attrs),
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forms.TextInput(attrs=attrs))
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super(LatLonWidget, self).__init__(widgets, attrs)
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def decompress(self, value):
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if value:
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return tuple(reversed(value.coords))
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return (None, None)
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class LatLonField(forms.MultiValueField):
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widget = LatLonWidget
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srid = 4326
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default_error_messages = {
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'invalid_latitude' : (u'Entrez une latitude valide.'),
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'invalid_longitude' : (u'Entrez une longitude valide.'),
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}
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def __init__(self, *args, **kwargs):
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fields = (forms.FloatField(min_value=-90, max_value=90),
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forms.FloatField(min_value=-180, max_value=180))
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super(LatLonField, self).__init__(fields, *args, **kwargs)
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def compress(self, data_list):
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if data_list:
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# Raise a validation error if latitude or longitude is empty
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# (possible if LatLongField has required=False).
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if data_list[0] in validators.EMPTY_VALUES:
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raise forms.ValidationError(self.error_messages['invalid_latitude'])
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if data_list[1] in validators.EMPTY_VALUES:
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raise forms.ValidationError(self.error_messages['invalid_longitude'])
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# SRID=4326;POINT(1.12345789 1.123456789)
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srid_str = 'SRID=%d'%self.srid
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point_str = 'POINT(%f %f)'%tuple(reversed(data_list))
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return ';'.join([srid_str, point_str])
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return None
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