Added extension documentation

_config/config.yml

@@ -17,8 +17,9 @@ Dynamic\Locator\Locator:
 
 ---
 Name: modules-locator
-After: modules-other
-Before: modules-framework
+After:
+  - modules-other
+  - modules-framework
 ---
 SilverStripe\Core\Manifest\ModuleManifest:
   module_priority:

docs/en/developerguide/extending.md

@@ -0,0 +1,35 @@
+## Extending
+The locator has some custom extension points.
+
+### LocatorForm
+#### updateLocatorFormFields(FieldList $fields)
+Used to update the fields of the locator form.
+Passed the current FieldList of the form.
+
+#### updateRequiredFields(Validator $validator)
+Used to update the required fields of the locator form.
+Passed the current Validator of the form.
+
+### LocatorController
+#### overrideRadiusArray(array $radii)
+Used to update or replace the radii used to make the radius dropdown.
+
+#### updateLocatorFilter(array $filter, HTTPRequest $request)
+Used to update the filters used on the location list when `setLocations()` is called.
+Passed the array of current filters and the current HTTPRequest.
+
+### updateLocatorFilterAny(array $filterAny, HTTPRequest $request)
+Used to update the filter anys used on the location list when `setLocations()` is called.
+Passed the array of current filter anys and the current HTTPRequest.
+
+### updateLocatorExclude(array $exclude, HTTPRequest $request)
+Used to update the excludes used on the location list when `setLocations()` is called.
+Passed the array of current excludes and the current HTTPRequest.
+
+### updateLocationList(ArrayList $locations)
+Used to update the location list when `setLocations()` is called.
+Passed the current list of locations after filters and excludes have been applied, but before distance has been applied.
+
+### updateListType(ArrayList $locations)
+Used to update the location list's type when `setLocations()` is called.
+Passed the current list of locations after filters, excludes, and distance have been applied and `updateLocationList()` has been run.

docs/en/index.md

@@ -10,3 +10,4 @@ See [Importing Locations](userguide/import.md) for information on importing Loca
 
 - [Setup](developerguide/setup.md)
 - [Customizing](developerguide/customizing.md)
+- [Extending](developerguide/extending.md)