From be0899b0ed156419c79461e103fd7e089633ec00 Mon Sep 17 00:00:00 2001
From: Eric Larson <larson.eric.d@gmail.com>
Date: Fri, 4 Mar 2022 13:56:59 -0500
Subject: [PATCH] MAINT: Refactor for mne-qt-browser

---
 mne/viz/backends/_qt.py    | 32 ++++----------------------------
 mne/viz/backends/_utils.py | 29 +++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 28 deletions(-)

diff --git a/mne/viz/backends/_qt.py b/mne/viz/backends/_qt.py
index 1301a3c4c21..3ecf25c4d23 100644
--- a/mne/viz/backends/_qt.py
+++ b/mne/viz/backends/_qt.py
@@ -28,8 +28,9 @@
                         _AbstractWindow, _AbstractMplCanvas, _AbstractPlayback,
                         _AbstractBrainMplCanvas, _AbstractMplInterface,
                         _AbstractWidgetList, _AbstractAction, _AbstractDialog)
-from ._utils import _init_qt_resources, _qt_disable_paint, _qt_raise_window
-from ..utils import logger, _check_option, safe_event
+from ._utils import (_init_qt_resources, _qt_disable_paint,
+                     _qt_get_stylesheet, _detect_theme, _qt_raise_window)
+from ..utils import _check_option, safe_event
 
 
 class _QtDialog(_AbstractDialog):
@@ -674,24 +675,7 @@ def _window_ensure_minimum_sizes(self):
             self._process_events()
 
     def _window_set_theme(self, theme):
-        if theme == 'auto':
-            theme = _detect_theme()
-
-        if theme == 'dark':
-            try:
-                import qdarkstyle
-            except ModuleNotFoundError:
-                logger.info('For Dark-Mode "qdarkstyle" has to be installed! '
-                            'You can install it with `pip install qdarkstyle`')
-                stylesheet = None
-            else:
-                stylesheet = qdarkstyle.load_stylesheet()
-        elif theme != 'light':
-            with open(theme, 'r') as file:
-                stylesheet = file.read()
-        else:
-            stylesheet = None
-
+        stylesheet = _qt_get_stylesheet(theme)
         self._window.setStyleSheet(stylesheet)
 
 
@@ -878,14 +862,6 @@ def _create_dock_widget(window, name, area, *, max_width=None):
     return dock, dock_layout
 
 
-def _detect_theme():
-    try:
-        import darkdetect
-        return darkdetect.theme().lower()
-    except Exception:
-        return 'light'
-
-
 @contextmanager
 def _testing_context(interactive):
     from . import renderer
diff --git a/mne/viz/backends/_utils.py b/mne/viz/backends/_utils.py
index 54e8c01224b..cc4a3a5c4d9 100644
--- a/mne/viz/backends/_utils.py
+++ b/mne/viz/backends/_utils.py
@@ -187,6 +187,35 @@ def _qt_app_exec(app):
             signal.signal(signal.SIGINT, old_signal)
 
 
+def _qt_get_stylesheet(theme='auto'):
+    from ..utils import logger
+    if theme == 'auto':
+        theme = _detect_theme()
+    if theme == 'dark':
+        try:
+            import qdarkstyle
+        except ModuleNotFoundError:
+            logger.info('For Dark-Mode "qdarkstyle" has to be installed! '
+                        'You can install it with `pip install qdarkstyle`')
+            stylesheet = None
+        else:
+            stylesheet = qdarkstyle.load_stylesheet()
+    elif theme != 'light':
+        with open(theme, 'r') as file:
+            stylesheet = file.read()
+    else:
+        stylesheet = None
+    return stylesheet
+
+
+def _detect_theme():
+    try:
+        import darkdetect
+        return darkdetect.theme().lower()
+    except Exception:
+        return 'light'
+
+
 def _qt_raise_window(widget):
     # Set raise_window like matplotlib if possible
     try: