disable combo and check boxes when MCU emulation is running

* set focus on "Start" button

* small change to GUI

Author: mzuther

src/PythonMcu.py

@@ -107,15 +107,15 @@ def __init__(self, parent=None):
         self.layout.addLayout(self.layout_2)
 
         self.frame_mcu = QFrame()
-        self.frame_mcu.setFrameStyle(QFrame.StyledPanel)
-        self.frame_mcu.setFrameShadow(QFrame.Raised)
+        self.frame_mcu.setFrameStyle(QFrame.Box)
+        self.frame_mcu.setFrameShadow(QFrame.Sunken)
         self.layout_2.addWidget(self.frame_mcu)
         self.grid_layout_mcu = QGridLayout()
         self.frame_mcu.setLayout(self.grid_layout_mcu)
 
         self.frame_controller = QFrame()
-        self.frame_controller.setFrameStyle(QFrame.StyledPanel)
-        self.frame_controller.setFrameShadow(QFrame.Raised)
+        self.frame_controller.setFrameStyle(QFrame.Box)
+        self.frame_controller.setFrameShadow(QFrame.Sunken)
         self.layout_2.addWidget(self.frame_controller)
         self.grid_layout_controller = QGridLayout()
         self.frame_controller.setLayout(self.grid_layout_controller)
@@ -171,6 +171,7 @@ def __init__(self, parent=None):
         self.button_start_stop = QPushButton('&Start')
         self.bottom_layout.addWidget(self.button_start_stop)
         self.button_start_stop.setDefault(True)
+        self.button_start_stop.setFocus()
         self.button_start_stop.clicked.connect(self.interconnector_start_stop)
 
         self.button_close = QPushButton('&Close')
@@ -181,6 +182,8 @@ def __init__(self, parent=None):
         self.bottom_layout.addWidget(self.button_about)
         self.button_about.clicked.connect(self.display_about)
 
+        self._enable_controls(True)
+
         self._timer = QTimer(self)
         self._timer.setInterval(int(self._midi_latency))
         self._timer.timeout.connect(self.process_midi_input)
@@ -267,6 +270,11 @@ def _create_combo_box(self, layout, selection, label_text, choices):
         return widget
 
 
+    def _enable_controls(self, state):
+        self.frame_mcu.setEnabled(state)
+        self.frame_controller.setEnabled(state)
+
+
     def _initialise_hardware_controller(self):
         # the hardware controller's class name is simply the
         # controller's manufacturer and name with all spaces converted
@@ -387,6 +395,7 @@ def display_about(self):
 
     def interconnector_start_stop(self):
         if not self._interconnector:
+            self._enable_controls(False)
             self.button_start_stop.setText('&Stop')
 
             self.callback_log('Settings')
@@ -435,6 +444,7 @@ def interconnector_start_stop(self):
 
             self._timer.start()
         else:
+            self._enable_controls(True)
             self.button_start_stop.setText('&Start')
             self._interconnector_stop()