Propagate shared variable for new scope (#1080) (#1287)

* Propagate shared variable for new scope

* put gui type in quote

taipy/gui/data/data_scope.py

@@ -16,13 +16,17 @@
 
 from .._warnings import _warn
 
+if t.TYPE_CHECKING:
+    from ..gui import Gui
+
 
 class _DataScopes:
     _GLOBAL_ID = "global"
     _META_PRE_RENDER = "pre_render"
     _DEFAULT_METADATA = {_META_PRE_RENDER: False}
 
-    def __init__(self) -> None:
+    def __init__(self, gui: "Gui") -> None:
+        self.__gui = gui
         self.__scopes: t.Dict[str, SimpleNamespace] = {_DataScopes._GLOBAL_ID: SimpleNamespace()}
         # { scope_name: { metadata: value } }
         self.__scopes_metadata: t.Dict[str, t.Dict[str, t.Any]] = {
@@ -63,6 +67,10 @@ def create_scope(self, id: str) -> None:
         if id not in self.__scopes:
             self.__scopes[id] = SimpleNamespace()
             self.__scopes_metadata[id] = _DataScopes._DEFAULT_METADATA.copy()
+            # Propagate shared variables to the new scope from the global scope
+            for var in self.__gui._get_shared_variables():
+                if hasattr(self.__scopes[_DataScopes._GLOBAL_ID], var):
+                    setattr(self.__scopes[id], var, getattr(self.__scopes[_DataScopes._GLOBAL_ID], var, None))
 
     def delete_scope(self, id: str) -> None:  # pragma: no cover
         if self.__single_client:

taipy/gui/utils/_bindings.py

@@ -23,7 +23,7 @@
 class _Bindings:
     def __init__(self, gui: "Gui") -> None:
         self.__gui = gui
-        self.__scopes = _DataScopes()
+        self.__scopes = _DataScopes(gui)
 
     def _bind(self, name: str, value: t.Any) -> None:
         if hasattr(self, name):
@@ -69,7 +69,7 @@ def _get_or_create_scope(self, id: str):
         return id, create
 
     def _new_scopes(self):
-        self.__scopes = _DataScopes()
+        self.__scopes = _DataScopes(self.__gui)
 
     def _get_data_scope(self):
         return self.__scopes.get_scope(self.__gui._get_client_id())[0]