Make it so only one preferences dialog can be open

cartridges/main.py

@@ -285,6 +285,9 @@ class CartridgesApplication(Adw.Application):
         page_name: Optional[str] = None,
         expander_row: Optional[str] = None,
     ) -> CartridgesWindow:
+        if CartridgesPreferences.is_open:
+            return
+
         win = CartridgesPreferences()
         if page_name:
             win.set_visible_page_name(page_name)

cartridges/preferences.py

@@ -118,8 +118,15 @@ class CartridgesPreferences(Adw.PreferencesDialog):
     removed_games: set[Game] = set()
     warning_menu_buttons: dict = {}
 
+    is_open = False
+
     def __init__(self, **kwargs: Any) -> None:
         super().__init__(**kwargs)
+
+        # Make it so only one dialog can be open at a time
+        self.__class__.is_open = True
+        self.connect("closed", lambda *_: self.set_is_open(False))
+
         self.file_chooser = Gtk.FileDialog()
 
         self.toast = Adw.Toast.new(_("All games removed"))
@@ -247,6 +254,9 @@ class CartridgesPreferences(Adw.PreferencesDialog):
         self.sgdb_key_entry_row.connect("changed", set_sgdb_sensitive)
         set_sgdb_sensitive(self.sgdb_key_entry_row)
 
+    def set_is_open(self, is_open: bool) -> None:
+        self.__class__.is_open = is_open
+
     def get_switch(self, setting: str) -> Any:
         return getattr(self, f'{setting.replace("-", "_")}_switch')