added Collection adjustable

slic/core/adjustable/__init__.py

@@ -8,6 +8,7 @@ from .pvadjustable import PVAdjustable
 from .pvenumadjustable import PVEnumAdjustable
 
 from .combined import Combined
+from .collection import Collection
 from .converted import Converted
 
 

slic/core/adjustable/collection.py

@@ -0,0 +1,35 @@
+from .adjustable import Adjustable
+
+
+class Collection(Adjustable):
+
+    def __init__(self, ID, adjs, **kwargs):
+        super().__init__(ID, **kwargs)
+        self.adjs = adjs
+
+    def get_current_value(self):
+        return tuple(a.get_current_value() for a in self.adjs)
+
+    def set_target_value(self, *vals):
+        adjs = self.adjs
+        _check_sizes(vals, adjs)
+        tasks = [a.set_target_value(v) for a, v in zip(adjs, vals)]
+        for t in tasks:
+            t.wait()
+
+    def is_moving(self):
+        return any(a.is_moving() for a in self.adjs)
+
+    def __repr__(self):
+        return "\n".join(repr(a) for a in self.adjs)
+
+
+
+def _check_sizes(vals, adjs):
+    nvals = len(vals)
+    nadjs = len(adjs)
+    if nvals != nadjs:
+        raise ValueError(f"number of values ({nvals}) is not equal to number of adjustables ({nadjs})")
+
+
+