137 lines
5.0 KiB
Python
137 lines
5.0 KiB
Python
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# RemovedInDjango50Warning.
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import logging
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import warnings
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from django.contrib.gis.gdal import GDALException
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from django.contrib.gis.geos import GEOSException, GEOSGeometry
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from django.forms.widgets import Textarea
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from django.utils import translation
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from django.utils.deprecation import RemovedInDjango50Warning
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# Creating a template context that contains Django settings
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# values needed by admin map templates.
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geo_context = {"LANGUAGE_BIDI": translation.get_language_bidi()}
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logger = logging.getLogger("django.contrib.gis")
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class OpenLayersWidget(Textarea):
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"""
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Render an OpenLayers map using the WKT of the geometry.
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"""
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def __init__(self, *args, **kwargs):
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warnings.warn(
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"django.contrib.gis.admin.OpenLayersWidget is deprecated.",
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RemovedInDjango50Warning,
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stacklevel=2,
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)
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super().__init__(*args, **kwargs)
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def get_context(self, name, value, attrs):
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# Update the template parameters with any attributes passed in.
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if attrs:
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self.params.update(attrs)
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self.params["editable"] = self.params["modifiable"]
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else:
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self.params["editable"] = True
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# Defaulting the WKT value to a blank string -- this
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# will be tested in the JavaScript and the appropriate
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# interface will be constructed.
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self.params["wkt"] = ""
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# If a string reaches here (via a validation error on another
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# field) then just reconstruct the Geometry.
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if value and isinstance(value, str):
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try:
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value = GEOSGeometry(value)
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except (GEOSException, ValueError) as err:
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logger.error("Error creating geometry from value '%s' (%s)", value, err)
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value = None
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if (
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value
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and value.geom_type.upper() != self.geom_type
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and self.geom_type != "GEOMETRY"
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):
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value = None
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# Constructing the dictionary of the map options.
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self.params["map_options"] = self.map_options()
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# Constructing the JavaScript module name using the name of
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# the GeometryField (passed in via the `attrs` keyword).
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# Use the 'name' attr for the field name (rather than 'field')
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self.params["name"] = name
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# note: we must switch out dashes for underscores since js
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# functions are created using the module variable
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js_safe_name = self.params["name"].replace("-", "_")
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self.params["module"] = "geodjango_%s" % js_safe_name
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if value:
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# Transforming the geometry to the projection used on the
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# OpenLayers map.
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srid = self.params["srid"]
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if value.srid != srid:
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try:
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ogr = value.ogr
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ogr.transform(srid)
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wkt = ogr.wkt
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except GDALException as err:
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logger.error(
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"Error transforming geometry from srid '%s' to srid '%s' (%s)",
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value.srid,
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srid,
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err,
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)
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wkt = ""
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else:
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wkt = value.wkt
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# Setting the parameter WKT with that of the transformed
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# geometry.
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self.params["wkt"] = wkt
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self.params.update(geo_context)
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return self.params
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def map_options(self):
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"""Build the map options hash for the OpenLayers template."""
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# JavaScript construction utilities for the Bounds and Projection.
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def ol_bounds(extent):
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return "new OpenLayers.Bounds(%s)" % extent
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def ol_projection(srid):
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return 'new OpenLayers.Projection("EPSG:%s")' % srid
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# An array of the parameter name, the name of their OpenLayers
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# counterpart, and the type of variable they are.
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map_types = [
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("srid", "projection", "srid"),
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("display_srid", "displayProjection", "srid"),
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("units", "units", str),
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("max_resolution", "maxResolution", float),
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("max_extent", "maxExtent", "bounds"),
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("num_zoom", "numZoomLevels", int),
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("max_zoom", "maxZoomLevels", int),
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("min_zoom", "minZoomLevel", int),
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]
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# Building the map options hash.
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map_options = {}
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for param_name, js_name, option_type in map_types:
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if self.params.get(param_name, False):
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if option_type == "srid":
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value = ol_projection(self.params[param_name])
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elif option_type == "bounds":
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value = ol_bounds(self.params[param_name])
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elif option_type in (float, int):
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value = self.params[param_name]
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elif option_type in (str,):
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value = '"%s"' % self.params[param_name]
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else:
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raise TypeError
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map_options[js_name] = value
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return map_options
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