turn save button read if there is unsafed entries

fake.py

@@ -32,7 +32,9 @@ data = {
         "x": None,
         "y": [1,2,3],
         "aaa": "aaa",
-        "c": "cccccc"
+        "c": "cccccc",
+        "image_background_enable": "passive",
+        "function": "spectrometer.py"
     },
 
     "ignored": {}
@@ -51,6 +53,8 @@ class PipelineClient:
         return server_info
     def get_instance_config(self, name):
         return data[name]
+    def set_instance_config(self, name, config):
+        pass
     def get_pipelines(self):
         return data.keys()
 

scam.py

@@ -104,6 +104,8 @@ class MainPanel(wx.Panel):
 
         self.entries = entries = SettingsList(self)
 
+        self.Bind(wx.EVT_TEXT, self.on_change)
+
         self.btn_print = btn_print = wx.Button(self, label="Print")
         self.btn_save = btn_save = wx.Button(self, label="Save")
 
@@ -290,6 +292,15 @@ class MainPanel(wx.Panel):
         pipeline = self.pls[self.instance]
         res = pipeline.set(new_cfg)
         print("result config:", res)
+        self.on_select(None) # get the server-side config again
+        self.btn_save.SetBackgroundColour(wx.NullColour)
+
+
+    def on_change(self, event):
+        old_cfg = self.orig_cfg
+        new_cfg = self.make_cfg()
+        color = wx.Colour(164, 36, 23) if new_cfg != old_cfg else wx.NullColour
+        self.btn_save.SetBackgroundColour(color)