properties: move the == comparaison in set() in compare_value() function.

properties: add a NumpyProperty, that copy the default value instead of just using it + adapt comparaison for numpy matrices

kivy/c_ext/properties.pyx

@@ -66,13 +66,16 @@ cdef class Property:
             return self
         return self.get(obj)
 
+    cdef compare_value(self, a, b):
+        return a == b
+
     cpdef set(self, obj, value):
         '''Set a new value for the property
         '''
         value = self.convert(obj, value)
         d = self.storage[obj.__uid]
         realvalue = d['value']
-        if realvalue == value:
+        if self.compare_value(realvalue, value):
             return False
         self.check(obj, value)
         d['value'] = value
@@ -267,7 +270,7 @@ cdef class ReferenceListProperty(Property):
         cdef int idx
         storage = self.storage[obj.__uid]
         value = self.convert(obj, value)
-        if storage['value'] == value:
+        if self.compare_value(storage['value'], value):
             return False
         self.check(obj, value)
         # prevent dependice loop
@@ -326,3 +329,11 @@ cdef class AliasProperty(Property):
     cpdef set(self, obj, value):
         self.storage[obj.__uid]['setter'](obj, value)
 
+cdef class NumpyProperty(Property):
+    cdef init_storage(self, dict storage):
+        Property.init_storage(self, storage)
+        storage['value'] = self.defaultvalue.copy()
+
+    cdef compare_value(self, a, b):
+        return (a == b).all()
+