ui, themes: allow to apply themes in runtime

When selecting a theme the Preferences dialog is stylized. If the user
saves the changes the theme will be applied to all the dialogs.

ui/opensnitch/dialogs/preferences.py

@@ -57,6 +57,7 @@ def __init__(self, parent=None, appicon=None):
         self.popupsCheck.clicked.connect(self._cb_popups_check_toggled)
         self.dbFileButton.clicked.connect(self._cb_file_db_clicked)
         self.checkUIRules.toggled.connect(self._cb_check_ui_rules_toggled)
+        self.comboUITheme.currentIndexChanged.connect(self._cb_combo_themes_changed)
         self.cmdTimeoutUp.clicked.connect(lambda: self._cb_cmd_spin_clicked(self.spinUITimeout, self.SUM))
         self.cmdTimeoutDown.clicked.connect(lambda: self._cb_cmd_spin_clicked(self.spinUITimeout, self.REST))
         self.cmdDBMaxDaysUp.clicked.connect(lambda: self._cb_cmd_spin_clicked(self.spinDBMaxDays, self.SUM))
@@ -151,6 +152,7 @@ def show_node_prefs(self, addr):
         self.tabWidget.setCurrentIndex(self.TAB_NODES)
 
     def _load_themes(self):
+        self.comboUITheme.blockSignals(True)
         theme_idx, self._saved_theme = self._themes.get_saved_theme()
 
         self.labelThemeError.setVisible(False)
@@ -167,6 +169,7 @@ def _load_themes(self):
             self.labelThemeError.setText(QC.translate("preferences", "Themes not available. Install qt-material: pip3 install qt-material"))
 
         self.comboUITheme.setCurrentIndex(theme_idx)
+        self.comboUITheme.blockSignals(False)
 
     def _load_settings(self):
         self._default_action = self._cfg.getInt(self._cfg.DEFAULT_ACTION_KEY)
@@ -416,7 +419,7 @@ def _save_ui_config(self):
                               int(Config.NOTIFICATION_TYPE_SYSTEM if self.radioSysNotifs.isChecked() else Config.NOTIFICATION_TYPE_QT))
 
         self._themes.save_theme(self.comboUITheme.currentIndex(), self.comboUITheme.currentText())
-        if self._themes.available() and self._saved_theme != "" and self._saved_theme != self.comboUITheme.currentText():
+        if self._themes.available() and self._saved_theme != "" and self.comboUITheme.currentText() == QC.translate("preferences", "System"):
             Message.ok(
                 QC.translate("preferences", "UI theme changed"),
                 QC.translate("preferences", "Restart the GUI in order to apply the new theme"),
@@ -567,6 +570,9 @@ def _cb_node_needs_update(self):
     def _cb_check_ui_rules_toggled(self, state):
         self.comboUIRules.setEnabled(state)
 
+    def _cb_combo_themes_changed(self, index):
+        self._themes.change_theme(self, self.comboUITheme.currentText())
+
     def _cb_db_max_days_toggled(self, state):
         self._enable_db_cleaner_options(state, 1)
 

ui/opensnitch/service.py

@@ -22,7 +22,7 @@
 from opensnitch.config import Config
 from opensnitch.version import version
 from opensnitch.database import Database
-from opensnitch.utils import Utils, CleanerTask
+from opensnitch.utils import Utils, CleanerTask, Themes
 from opensnitch.utils import Message
 
 class UIService(ui_pb2_grpc.UIServicer, QtWidgets.QGraphicsObject):
@@ -86,6 +86,7 @@ def __init__(self, app, on_exit):
         self._remote_lock = Lock()
         self._remote_stats = {}
 
+        self._themes = Themes()
         self._desktop_notifications = DesktopNotifications()
         self._setup_interfaces()
         self._setup_icons()
@@ -349,6 +350,10 @@ def _on_settings_saved(self):
         elif self._cfg.getBool(Config.DEFAULT_DB_PURGE_OLDEST) == False and self._cleaner != None:
             self._stop_db_cleaner()
 
+        theme_idx, theme_name = self._themes.get_saved_theme()
+        if theme_idx > 0:
+            self._themes.load_theme(self._app)
+
     def _stop_db_cleaner(self):
         if self._cleaner != None:
             self._cleaner.stop()

ui/opensnitch/utils.py

@@ -158,6 +158,13 @@ def load_theme(self, app):
         except Exception as e:
             print("Themes.load_theme() exception:", e)
 
+    def change_theme(self, window, theme_name):
+        try:
+            invert = "light" in theme_name
+            Themes.qtmaterial_apply_stylesheet(window, theme=theme_name,  invert_secondary=invert)
+        except Exception as e:
+            print("Themes.change_theme() exception:", e, " - ", window, theme_name)
+
     def list_local_themes(self):
         themes = []
         if not Themes.AVAILABLE: