添加系统主题监听器 SystemThemeListener (#954)

examples/gallery/app/view/main_window.py

@@ -1,10 +1,10 @@
 # coding: utf-8
-from PyQt5.QtCore import QUrl, QSize
+from PyQt5.QtCore import QUrl, QSize, QTimer
 from PyQt5.QtGui import QIcon, QDesktopServices, QColor
 from PyQt5.QtWidgets import QApplication
 
 from qfluentwidgets import (NavigationAvatarWidget, NavigationItemPosition, MessageBox, FluentWindow,
-                            SplashScreen)
+                            SplashScreen, SystemThemeListener, isDarkTheme)
 from qfluentwidgets import FluentIcon as FIF
 
 from .gallery_interface import GalleryInterface
@@ -35,6 +35,9 @@ def __init__(self):
         super().__init__()
         self.initWindow()
 
+        # create system theme listener
+        self.themeListener = SystemThemeListener(self)
+
         # create sub interface
         self.homeInterface = HomeInterface(self)
         self.iconInterface = IconInterface(self)
@@ -60,6 +63,9 @@ def __init__(self):
         self.initNavigation()
         self.splashScreen.finish()
 
+        # start theme listener
+        self.themeListener.start()
+
     def connectSignalToSlot(self):
         signalBus.micaEnableChanged.connect(self.setMicaEffectEnabled)
         signalBus.switchToSampleCard.connect(self.switchToSample)
@@ -129,6 +135,18 @@ def resizeEvent(self, e):
         if hasattr(self, 'splashScreen'):
             self.splashScreen.resize(self.size())
 
+    def closeEvent(self, e):
+        self.themeListener.terminate()
+        self.themeListener.deleteLater()
+        super().closeEvent(e)
+
+    def _onThemeChangedFinished(self):
+        super()._onThemeChangedFinished()
+
+        # retry
+        if self.isMicaEffectEnabled():
+            QTimer.singleShot(100, lambda: self.windowEffect.setMicaEffect(self.winId(), isDarkTheme()))
+
     def switchToSample(self, routeKey, index):
         """ switch to sample """
         interfaces = self.findChildren(GalleryInterface)

examples/gallery/app/view/setting_interface.py

@@ -220,7 +220,7 @@ def __connectSignalToSlot(self):
             self.__onDownloadFolderCardClicked)
 
         # personalization
-        self.themeCard.optionChanged.connect(lambda ci: setTheme(cfg.get(ci)))
+        cfg.themeChanged.connect(setTheme)
         self.themeColorCard.colorChanged.connect(lambda c: setThemeColor(c))
         self.micaCard.checkedChanged.connect(signalBus.micaEnableChanged)
 

qfluentwidgets/common/__init__.py

@@ -8,4 +8,5 @@
 from .smooth_scroll import SmoothScroll, SmoothMode
 from .translator import FluentTranslator
 from .router import qrouter, Router
-from .color import FluentThemeColor
+from .color import FluentThemeColor
+from .theme_listener import SystemThemeListener

qfluentwidgets/common/theme_listener.py

@@ -0,0 +1,27 @@
+# coding:utf-8
+from PyQt5.QtCore import QThread, pyqtSignal
+
+from .config import Theme, qconfig
+import darkdetect
+
+
+class SystemThemeListener(QThread):
+    """ System theme listener """
+
+    systemThemeChanged = pyqtSignal()
+
+    def __init__(self, parent=None):
+        super().__init__(parent=parent)
+
+    def run(self):
+        darkdetect.listener(self._onThemeChanged)
+
+    def _onThemeChanged(self, theme: str):
+        theme = Theme.DARK if theme.lower() == "dark" else Theme.LIGHT
+
+        if qconfig.themeMode.value != Theme.AUTO or theme == qconfig.theme:
+            return
+
+        qconfig.theme = Theme.AUTO
+        qconfig._cfg.themeChanged.emit(Theme.AUTO)
+        self.systemThemeChanged.emit()