feat: lazy refresh model on page change (WIP)

dzgui/controllers/mc.py

@@ -307,6 +307,7 @@ class Controller:
 
     def show_developers_page(self) -> None:
         self.open_page(NotebookPage.DEVELOPERS)
+        # TODO: focus first row
 
     def open_page(self, page: NotebookPage) -> None:
         self.mediator.grid.notebook.set_page_by_enum(page)
@@ -593,3 +594,22 @@ class Controller:
     def get_crumbs_cache(self) -> None:
         return self.crumbs_cache
         self.crumbs_cache = text
+
+    def refresh_tree(self) -> None:
+        treeview = self.mediator.notebook.servers.get_active_treeview()
+        treeview.set_loaded(False)
+        self.populate_model()
+
+    def populate_model(self) -> None:
+        # TODO: always use same server model, store in servertreeview class
+        treeview = self.mediator.notebook.servers.get_active_treeview()
+        if treeview.get_loaded() is False:
+            new_model = self.model_manager.new_model()
+            func = treeview.get_query_func()
+            if func is not None:
+                model = treeview.get_model()
+                model.clear()
+                data = func()
+                model.append(data)
+            treeview.set_loaded(True)
+            self.update_server_status()

dzgui/controllers/model.py

@@ -89,10 +89,10 @@ class ModelManager:
         self.filtered = None
         self.success = True
 
-    def __new__(cls) -> Self:
-        if not hasattr(cls, "instance"):
-            cls.instance = super(ModelManager, cls).__new__(cls)
-        return cls.instance
+    #def __new__(cls) -> Self:
+    #    if not hasattr(cls, "instance"):
+    #        cls.instance = super(ModelManager, cls).__new__(cls)
+    #    return cls.instance
 
     def get_recent_store(self) -> ListStore:
         return self.recent_store