Disentangle plugins and window management; use Qt signals

gui/qt/__init__.py

@@ -91,6 +91,7 @@ class ElectrumGui:
         self.build_tray_menu()
         self.tray.show()
         self.app.connect(self.app, QtCore.SIGNAL('new_window'), self.start_new_window)
+        run_hook('init_qt', self)
 
     def build_tray_menu(self):
         # Avoid immediate GC of old menu when window closed via its action
@@ -217,7 +218,7 @@ class ElectrumGui:
                 w.show()
             self.windows.append(w)
             self.build_tray_menu()
-            self.plugins.on_new_window(w)
+            run_hook('on_new_window', w)
 
         if uri:
             w.pay_to_URI(uri)
@@ -227,7 +228,7 @@ class ElectrumGui:
     def close_window(self, window):
         self.windows.remove(window)
         self.build_tray_menu()
-        self.plugins.on_close_window(window)
+        run_hook('on_close_window', window)
 
     def main(self):
         self.timer.start()

gui/qt/main_window.py

@@ -565,8 +565,6 @@ class ElectrumWindow(QMainWindow, PrintError):
 
     def update_wallet(self):
         self.update_status()
-        if self.wallet is None:
-            return
         if self.wallet.up_to_date or not self.network or not self.network.is_connected():
             self.update_tabs()
 
@@ -2868,6 +2866,7 @@ class ElectrumWindow(QMainWindow, PrintError):
             p = plugins.toggle_enabled(self.config, name)
             cb.setChecked(bool(p))
             enable_settings_widget(p, name, i)
+            run_hook('init_qt', self.gui_object)
 
         for i, descr in enumerate(plugins.descriptions):
             name = descr['name']