wip: basic theming support

app.py

@@ -2,12 +2,13 @@ import sys
 from pathlib import Path
 
 import structlog
-from PySide6.QtCore import QCoreApplication, QObject, Qt, QUrl
+from PySide6.QtCore import QCoreApplication, QEvent, QObject, Qt, QUrl
 from PySide6.QtGui import QGuiApplication, QIcon
 from PySide6.QtQml import QQmlApplicationEngine
 from PySide6.QtQuickControls2 import QQuickStyle
 
 from ui.resources import resources_rc  # noqa: F401
+from ui.theme import ThemeManager
 from ui.utils import url  # noqa: F401
 from ui.viewmodels import overview  # noqa: F401
 
@@ -18,6 +19,34 @@ DEFAULT_FONTS = ["微软雅黑", "Microsoft YaHei UI", "Microsoft YaHei", "Segoe
 logger: structlog.stdlib.BoundLogger = structlog.get_logger()
 
 
+class ThemeChangeEventFilter(QObject):
+    logger: structlog.stdlib.BoundLogger = structlog.get_logger(
+        tag="ThemeChangeEventFilter",
+    )
+
+    def __init__(self, *, themeManager: ThemeManager):
+        super().__init__(None)
+        self.themeManager = themeManager
+
+        self.scheme = self.themeManager.getCurrentScheme()
+
+    def doSomething(self) -> None:
+        scheme = self.themeManager.getCurrentScheme()
+        if scheme == self.scheme:
+            self.logger.debug("Ignored same scheme event (%r)", scheme)
+            return
+
+        self.scheme = scheme
+        self.themeManager.updateTheme()
+        self.logger.debug("something done")
+
+    def eventFilter(self, obj: QObject, event: QEvent) -> bool:
+        if event.type() == QEvent.Type.ThemeChange:
+            self.doSomething()
+
+        return False
+
+
 def main() -> None:
     app = QGuiApplication(sys.argv)
     app.setFont(DEFAULT_FONTS)
@@ -25,10 +54,20 @@ def main() -> None:
     app.setApplicationDisplayName("Arcaea Offline")
     app.setWindowIcon(QIcon(":/images/icon.png"))
 
-    QQuickStyle.setStyle("Fusion")
-
     engine = QQmlApplicationEngine()
 
+    themeManager = ThemeManager(parent=app)
+
+    def onThemeManagerThemeChanged():
+        logger.debug("App palette changed")
+        app.setPalette(themeManager.qPalette)  # pyright: ignore[reportArgumentType]
+        engine.rootContext().setContextProperty("appTheme", themeManager.qmlExposer)
+
+    onThemeManagerThemeChanged()
+    themeManager.themeChanged.connect(onThemeManagerThemeChanged)
+
+    QQuickStyle.setStyle("Fusion")
+
     def onEngineObjectCreated(obj: QObject | None, objUrl: QUrl) -> None:
         if obj is None:
             logger.critical("rootObject is None! Exiting!")
@@ -41,6 +80,10 @@ def main() -> None:
 
     engine.load("ui/qmls/App.qml")
 
+    rootObject = engine.rootObjects()[0]
+    ef = ThemeChangeEventFilter(themeManager=themeManager)
+    rootObject.installEventFilter(ef)
+
     sys.exit(app.exec())