made image_background_enable an enforced setting

scam.py

@@ -9,13 +9,16 @@ clargs = parser.parse_args()
 
 SHOWN_SETTINGS = {
     "image_background": "Background",
-    "image_background_enable": "image_background_enable",
     "image_threshold": "image_threshold",
     "project_axis": "Projection axis",
     "roi_background": "ROI Background",
     "roi_signal": "ROI Signal"
 }
 
+ENFORCED_SETTINGS = [
+    "image_background_enable"
+]
+
 
 import wx
 
@@ -94,7 +97,12 @@ class MainPanel(wx.Panel):
         cfg = pc.get_instance_config(instance)
         print(cfg)
 
+        self.orig_cfg = cfg
         self.camera = cfg["camera_name"]
+
+        if not clargs.show_all_settings:
+            check_incoming_cfg(cfg)
+
         self.eb_bkg.Enable()
         self.btn_print.Enable()
         self.btn_save.Enable()
@@ -114,24 +122,48 @@ class MainPanel(wx.Panel):
         parent.Fit()
 
 
-    def on_print(self, event):
-        new_cfg = self.entries.get()
-        print(new_cfg)
-        old_cfg = pc.get_instance_config(self.instance)
+    def make_cfg(self):
+        cfg = self.entries.get()
 
         if not clargs.show_all_settings:
-            old_cfg = {k: v for k, v in old_cfg.items() if k in SHOWN_SETTINGS}
+            cfg = check_outgoing_cfg(cfg)
 
+        return cfg
+
+
+    def on_print(self, event):
+        new_cfg = self.make_cfg()
+
+        old_cfg = self.orig_cfg
+        if not clargs.show_all_settings:
+            old_cfg = {k: v for k, v in old_cfg.items() if k in list(SHOWN_SETTINGS) + ENFORCED_SETTINGS}
+
+        print("old config:", old_cfg)
+        print("new config:", new_cfg)
         print("unchanged" if old_cfg == new_cfg else "changed")
 
 
     def on_save_cfg(self, event):
-        new_cfg = self.entries.get()
+        new_cfg = self.make_cfg()
         res = pc.set_instance_config(self.instance, new_cfg)
         print(res)
 
 
 
+def check_incoming_cfg(cfg):
+    bkg_enable = cfg.get("image_background_enable")
+    if bkg_enable not in (None, "passive"):
+        printable_bkg_enable = repr(bkg_enable).replace("'", '"')
+        print(f"Warning: found: image_background_enable = {printable_bkg_enable}, this will be set to None or \"passive\" upon saving")
+
+
+def check_outgoing_cfg(cfg):
+    bkg = cfg["image_background"]
+    cfg["image_background_enable"] = "passive" if bkg else None
+    return cfg
+
+
+
 
 
 app = wx.App()