Merge pull request #2721 from SasView/2712-annoying-behaviour-when-op…

…ening-a-project

2712 annoying behaviour when opening a project

src/sas/qtgui/MainWindow/DataExplorer.py

@@ -1030,6 +1030,10 @@ def updatePerspectiveCombo(self, index):
         Notify the gui manager about the new perspective chosen.
         """
 
+        # Check that a valid index has been chosen, can happen in some cases such a loading projects
+        if index < 0:
+            return
+
         # Notify via communicator
         self.communicator.perspectiveChangedSignal.emit(self.cbFitting.itemText(index))
 

src/sas/qtgui/MainWindow/GuiManager.py

@@ -207,20 +207,27 @@ def addWidgets(self):
         self.WhatsNew = WhatsNew(self)
 
     def loadAllPerspectives(self):
+        """ Load all the perspectives"""
         # Close any existing perspectives to prevent multiple open instances
         self.closeAllPerspectives()
         # Load all perspectives
-        loaded_dict = {}
+        loaded_dict = {} # dictionary that will ultimately keep track of all perspective instances
         for name, perspective in Perspectives.PERSPECTIVES.items():
             try:
+                # Instantiate perspective
                 loaded_perspective = perspective(parent=self)
+
+                # Save in main dict
                 loaded_dict[name] = loaded_perspective
-                pref_widgets = loaded_perspective.preferences
-                for widget in pref_widgets:
-                    self.preferences.addWidget(widget)
+
+                # Register the perspective with the prefernce object
+                self.preferences.registerPerspectivePreferences(loaded_perspective)
+
             except Exception as e:
                 logger.error(f"Unable to load {name} perspective.\n{e}")
                 logger.error(e, exc_info=True)
+
+        # attach loaded perspectives to this class
         self.loadedPerspectives = loaded_dict
 
     def closeAllPerspectives(self):

src/sas/qtgui/Utilities/Preferences/PreferencesPanel.py

@@ -7,6 +7,9 @@
 from typing import Optional, Callable, Dict, Any, Union, List
 
 from sas.system import config
+
+from sas.qtgui.Perspectives.perspective import Perspective
+
 from sas.qtgui.Utilities.Preferences.UI.PreferencesUI import Ui_preferencesUI
 from sas.qtgui.Utilities.Preferences.PreferencesWidget import PreferencesWidget
 
@@ -56,6 +59,8 @@ def __init__(self, parent: Optional[Any] = None):
         self.buttonBox.button(QDialogButtonBox.Help).clicked.connect(self.help)
         self._set_accept()
 
+        self.registered_perspectives: list[str] = []
+
     def addWidgets(self, widgets: Dict[str, Callable]):
         """Add a list of named widgets to the window"""
         for name, widget in widgets.items():
@@ -169,6 +174,7 @@ def close(self):
 
     def addWidget(self, widget: QWidget, name: Optional[str] = None):
         """Add a single widget to the panel"""
+
         # Set the parent of the new widget to the parent of this window
         widget.parent = self
         self.stackedWidget.addWidget(widget)
@@ -177,8 +183,19 @@ def addWidget(self, widget: QWidget, name: Optional[str] = None):
         name = name if name is not None else getattr(widget, 'name', None)
         name = name if name is not None else "Generic Preferences"
         # Add the widget default reset method to the global set
+
         self.listWidget.addItem(name)
 
+    def registerPerspectivePreferences(self, perspective: Perspective):
+        """ Register preferences from a perspective"""
+
+        if perspective.name not in self.registered_perspectives:
+
+            for preference_widget in perspective.preferences:
+
+                self.addWidget(preference_widget)
+                self.registered_perspectives.append(perspective.name)
+
     def help(self):
         """Open the help window associated with the preferences window"""
         tree_location = "/user/qtgui/MainWindow/preferences_help.html"