wip: basic theming support

ui/theme/shared.py

@@ -0,0 +1,43 @@
+from dataclasses import dataclass
+from typing import Literal, TypedDict
+
+from PySide6.QtGui import QColor, QPalette
+
+
+class _TCustomPalette(TypedDict):
+    primary: QColor
+    success: QColor
+    error: QColor
+
+
+_TScheme = Literal["light", "dark"]
+
+
+@dataclass
+class ThemeInfo:
+    series: str
+    name: str
+    scheme: _TScheme
+
+    def __hash__(self) -> int:
+        return hash((self.series, self.name, self.scheme))
+
+
+class ThemeImpl:
+    DEFAULT_CUSTOM_PALETTE = {
+        "primary": QColor.fromString("#616161"),
+        "success": QColor.fromString("#616161"),
+        "error": QColor.fromString("#616161"),
+    }
+
+    @property
+    def info(self) -> ThemeInfo:
+        return ThemeInfo(series="placeholder", name="placeholder", scheme="dark")
+
+    @property
+    def qPalette(self) -> QPalette:
+        return QPalette()
+
+    @property
+    def customPalette(self) -> _TCustomPalette:
+        return self.DEFAULT_CUSTOM_PALETTE  # pyright: ignore[reportReturnType]