wip: basic theming support

ui/theme/qml.py

@@ -0,0 +1,37 @@
+from PySide6.QtCore import Property, QObject, Signal
+from PySide6.QtGui import QColor
+
+from .shared import ThemeImpl
+
+QML_IMPORT_NAME = "internal.ui.theme"
+QML_IMPORT_MAJOR_VERSION = 1
+QML_IMPORT_MINOR_VERSION = 0
+
+
+class ThemeQmlExposer(QObject):
+    themeChanged = Signal()
+
+    def __init__(self, *, themeImpl: ThemeImpl, parent: QObject | None = None):
+        super().__init__(parent)
+        self._themeImpl = themeImpl
+
+    @property
+    def themeImpl(self) -> ThemeImpl:
+        return self._themeImpl
+
+    @themeImpl.setter
+    def themeImpl(self, themeImpl: ThemeImpl):
+        self._themeImpl = themeImpl
+        self.themeChanged.emit()
+
+    @Property(QColor, notify=themeChanged)
+    def primary(self):
+        return self._themeImpl.customPalette["primary"]
+
+    @Property(QColor, notify=themeChanged)
+    def success(self):
+        return self._themeImpl.customPalette["success"]
+
+    @Property(QColor, notify=themeChanged)
+    def error(self):
+        return self._themeImpl.customPalette["error"]