WIP: Make mouse svg follow dark mode

piper/mousemap.py

@@ -9,14 +9,18 @@
 
 gi.require_version("Gdk", "3.0")
 gi.require_version("Gtk", "3.0")
+gi.require_version("Handy", "1")
 gi.require_version("Rsvg", "2.0")
-from gi.repository import Gdk, GLib, Gtk, GObject, Rsvg  # noqa
+from gi.repository import Gdk, GLib, Gtk, GObject, Handy, Rsvg  # noqa
 
 """This module contains the MouseMap widget (and its helper class
 _MouseMapChild), which is central to the button and LED configuration stack
 pages. The MouseMap widget draws the device SVG in the center and lays out a
 bunch of child widgets relative to the leaders in the device SVG."""
 
+# FIXME set_stylesheet to something that actually makes the content dark.
+dark_stylesheet = b"svg {fill: red}"
+
 
 class _MouseMapChild:
     # A helper class to manage children and their properties.
@@ -89,13 +93,19 @@ def __init__(self, layer, ratbagd_device, spacing=10, *args, **kwargs):
                            has no image registered.
         @raises GLib.Error when the SVG cannot be loaded.
         """
+        manager = Handy.StyleManager.get_default()
+        manager.connect("notify::dark", self._on_dark_changed)
+
         if layer is None:
             raise ValueError("Layer cannot be None")
         if ratbagd_device is None:
             raise ValueError("Device cannot be None")
         try:
             svg_bytes = get_svg(ratbagd_device.model)
             self._handle = Rsvg.Handle.new_from_data(svg_bytes)
+            if manager.get_dark():
+                self._handle.set_stylesheet(dark_stylesheet)
+
             self._svg_data = etree.fromstring(svg_bytes)
         except FileNotFoundError:
             raise ValueError("Device has no image or its path is invalid")
@@ -404,3 +414,11 @@ def _draw_device(self, cr):
         for child in self._children:
             self._handle.render_cairo_sub(cr, id=child.svg_path)
             self._handle.render_cairo_sub(cr, id=child.svg_leader)
+
+    def _on_dark_changed(self, manager, _pspec):
+        if manager.get_dark():
+            self._handle.set_stylesheet(dark_stylesheet)
+        else:
+            self._handle.set_stylesheet(b"")
+
+        self.queue_draw()