allow LEAFLET_CONFIG to be dynamically overriden

Author: PetrDlouhy

README.rst

@@ -490,6 +490,29 @@ Advanced usage
   If empty values is provided, then map initialization is immediate.
   And with a wrong value, the map is never initialized. :)
 
+* ``settings_overrides``: Map with overrides to the default LEAFLET_CONFIG settings.
+  (Default: {}).
+
+Config overrides
+~~~~~~~~~~~~~~~~
+
+It is possible to dynamically override settings in LeafletWidget initi:
+
+::
+
+    from leaflet.forms.widgets import LeafletWidget
+
+
+    class WeatherStationForm(forms.ModelForm):
+
+        class Meta:
+            model = WeatherStation
+            fields = ('name', 'geom')
+            widgets = {'geom': LeafletWidget(attrs={
+                'settings_overrides': {
+                    'DEFAULT_CENTER': (6.0, 45.0),
+                }
+            })}
 
 Projection
 ~~~~~~~~~~

leaflet/templates/leaflet/widget.html

@@ -37,7 +37,7 @@
 
 {% if not target_map %}
 {% block map %}
-    {% leaflet_map id_map callback=id_map_callback %}
+    {% leaflet_map id_map callback=id_map_callback settings_overrides=settings_overrides %}
 {% endblock map %}
 {% endif %}
 

leaflet/templatetags/leaflet_tags.py

@@ -47,7 +47,7 @@ def leaflet_js(plugins=None):
 
 
 @register.inclusion_tag('leaflet/_leaflet_map.html')
-def leaflet_map(name, callback=None, fitextent=True, creatediv=True, loadevent='load'):
+def leaflet_map(name, callback=None, fitextent=True, creatediv=True, loadevent='load', settings_overrides={}):
     """
 
     :param name:
@@ -62,6 +62,10 @@ def leaflet_map(name, callback=None, fitextent=True, creatediv=True, loadevent='
         xmin, ymin, xmax, ymax = SPATIAL_EXTENT
         extent = (ymin, xmin, ymax, xmax)
 
+    if settings_overrides == '':
+        settings_overrides = {}
+    app_settings.update(**settings_overrides)
+
     djoptions = dict(
         srid=SRID,
         extent=[extent[:2], extent[2:4]],