Create fake radio button for selectorwin menus

src/ui_wx/__init__.py

@@ -1,6 +1,6 @@
 """This package contains UI code specific to WxWidgets."""
 from __future__ import annotations
-from typing import Literal
+from typing import Final, Literal
 
 from collections.abc import Callable
 import logging
@@ -118,3 +118,19 @@ def _join(self, children: list[str]) -> str:
 
 PEN_SLOT_BORDER = wx.Pen(wx.SystemSettings.GetColour(wx.SYS_COLOUR_WINDOWFRAME), 3)
 PEN_SLOT_BORDER_SEL = wx.Pen(wx.SystemSettings.GetColour(wx.SYS_COLOUR_HIGHLIGHT), 3)
+
+
+def _make_radio_icon() -> wx.Bitmap:
+    """Generate a bitmap which makes check-style menus look like radio menus."""
+    from PIL import Image, ImageDraw
+    fill = wx.SystemSettings.GetColour(wx.SYS_COLOUR_MENUTEXT)
+    # Draw oversize then scale down to get some antialiasing.
+    img = Image.new('RGBA', (64, 64))
+    draw = ImageDraw.Draw(img)
+    draw.ellipse([20, 20, 40, 40], (fill.red, fill.green, fill.blue, fill.alpha))
+    return wx.Bitmap.FromBufferRGBA(16, 16, img.resize((16, 16)).tobytes())
+
+
+# TODO: Can't change the button design on other platforms, unfortunately.
+#       They only allow a single icon for both checked/unchecked.
+RADIO_MENU_BITMAP: Final = _make_radio_icon() if utils.WIN else wx.NullBitmap

src/ui_wx/selector_win.py

@@ -21,7 +21,7 @@
 from consts import SEL_ICON_SIZE
 from packages import AttrTypes
 from transtoken import CURRENT_LANG, TransToken
-from ui_wx import MARKDOWN, wid_transtoken, PEN_SLOT_BORDER, PEN_SLOT_BORDER_SEL
+from ui_wx import MARKDOWN, PEN_SLOT_BORDER, PEN_SLOT_BORDER_SEL, RADIO_MENU_BITMAP, wid_transtoken
 from ui_wx.img import WX_IMG, ImageSlot
 import utils
 
@@ -670,14 +670,12 @@ def _ui_menu_add(
         label: TransToken, /,
     ) -> None:
         """Add the specified item to the group's menu."""
-        # TODO: Ideally these should be radio buttons, not check buttons.
-        #       But each menu gets a different group assigned.
-        #       Maybe use custom bitmaps?
         self._menu_items[item] = menu_item = group.menu.AppendCheckItem(
             wx.ID_ANY, f'<item>:{item}', '',
         )
         wid_transtoken.set_menu_text(menu_item, label)
         group.menu.Bind(wx.EVT_MENU, lambda evt: func(), menu_item)
+        menu_item.SetBitmap(RADIO_MENU_BITMAP, True)
 
     @override
     def _ui_menu_set_font(self, item_id: utils.SpecialID, /, suggested: bool) -> None: