Prevent the user from closing the display window

openlp/core/display/window.py

@@ -89,6 +89,7 @@ class DisplayWindow(QtWidgets.QWidget, RegistryProperties, LogMixin):
         # Need to import this inline to get around a QtWebEngine issue
         from openlp.core.display.webengine import WebEngineView
         self._is_initialised = False
+        self._is_manual_close = False
         self._can_show_startup_screen = can_show_startup_screen
         self._fbo = None
         self.setWindowTitle(translate('OpenLP.DisplayWindow', 'Display Window'))
@@ -130,6 +131,13 @@ class DisplayWindow(QtWidgets.QWidget, RegistryProperties, LogMixin):
             if len(ScreenList()) > 1 or self.settings.value('core/display on monitor'):
                 self.show()
 
+    def closeEvent(self, event):
+        """
+        Override the closeEvent method to prevent the window from being closed by the user
+        """
+        if not self._is_manual_close:
+            event.ignore()
+
     def _fix_font_name(self, font_name):
         """
         Do some font machinations to see if we can fix the font name
@@ -150,6 +158,7 @@ class DisplayWindow(QtWidgets.QWidget, RegistryProperties, LogMixin):
         if self.is_display:
             Registry().remove_function('live_display_hide', self.hide_display)
             Registry().remove_function('live_display_show', self.show_display)
+        self._is_manual_close = True
 
     @property
     def is_initialised(self):

openlp/core/ui/mainwindow.py

@@ -1096,9 +1096,7 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow, LogMixin, RegistryPropert
         if self.new_data_path:
             self.change_data_directory()
         # Close down the display
-        if self.live_controller.display:
-            self.live_controller.display.close()
-            # self.live_controller.display = None
+        self.live_controller.close_displays()
         # Clean temporary files used by services
         self.service_manager_contents.clean_up()
         if is_win():

openlp/core/ui/slidecontroller.py

@@ -174,13 +174,8 @@ class SlideController(QtWidgets.QWidget, LogMixin, RegistryProperties):
         """
         if not self.is_live:
             return
-        if self.displays:
-            # Delete any existing displays
-            for display in self.displays:
-                display.deregister_display()
-                display.setParent(None)
-                del display
-            self.displays = []
+        # Delete any existing displays
+        self.close_displays()
         for screen in self.screens:
             if screen.is_display:
                 display = DisplayWindow(self, screen)
@@ -189,6 +184,17 @@ class SlideController(QtWidgets.QWidget, LogMixin, RegistryProperties):
         if self.display:
             self.__add_actions_to_widget(self.display)
 
+    def close_displays(self):
+        """
+        Close all open displays
+        """
+        for display in self.displays:
+            display.deregister_display()
+            display.setParent(None)
+            display.close()
+            del display
+        self.displays = []
+
     @property
     def display(self):
         return self.displays[0] if self.displays else None

tests/openlp_core/display/test_window.py

@@ -666,3 +666,34 @@ def test_display_watcher_please_repaint(display_window_env, mock_settings):
 
     # THEN: Qt update for the webview should have been triggered
     assert display_window.webview.update.call_count == 1
+
+
+def test_close_event_ignores_event(display_window_env, mock_settings):
+    """
+    Test that when the window receives a close event, it ignores it
+    """
+    # GIVEN: A DisplayWindow instance and a mocked event
+    display_window = DisplayWindow()
+    mocked_event = MagicMock()
+
+    # WHEN: The closeEvent() method is called
+    display_window.closeEvent(mocked_event)
+
+    # THEN: The event should have been ignored
+    mocked_event.ignore.assert_called_once()
+
+
+def test_close_event_accepts_event_manual_close(display_window_env, mock_settings):
+    """
+    Test that when the window receives a close event due to manually being closed, it accepts it
+    """
+    # GIVEN: A DisplayWindow instance and a mocked event
+    display_window = DisplayWindow()
+    mocked_event = MagicMock()
+
+    # WHEN: The closeEvent() method is called
+    display_window._is_manual_close = True
+    display_window.closeEvent(mocked_event)
+
+    # THEN: The event should have been ignored
+    assert mocked_event.ignore.called is False

tests/openlp_core/ui/test_slidecontroller.py

@@ -1552,3 +1552,22 @@ def test_initial_preview_controller(registry):
     # WHEN: the default controller is built.
     # THEN: The controller should not be a live controller.
     assert preview_controller.is_live is False, 'The slide controller should be a Preview controller'
+
+
+def test_close_displays(registry):
+    """
+    Test that closing the displays calls the correct methods
+    """
+    # GIVEN: A Live controller and a mocked display
+    mocked_display = MagicMock()
+    live_controller = LiveController(None)
+    live_controller.displays = [mocked_display]
+
+    # WHEN: close_displays() is called
+    live_controller.close_displays()
+
+    # THEN: The display is closed
+    mocked_display.deregister_display.assert_called_once()
+    mocked_display.setParent.assert_called_once_with(None)
+    mocked_display.close.assert_called_once()
+    assert live_controller.displays == []