raylib ui: common state update function (#35546)

* add _update_state

* nonlya

* visible already does this for us!

* do hud renderer and exp button

* temp

* this really needs some type of timer like QT

* this really needs some type of timer like QT

* todo

* use in model renderer

* Revert "use in model renderer"

This reverts commit d35f774155c9875209d06b8cd0b4849b1d8a60c4.

* no passing rect

* cl

* unused now

system/ui/lib/widget.py

@@ -34,6 +34,8 @@ class Widget(abc.ABC):
     if rect is not None:
       self.set_rect(rect)
 
+    self._update_state()
+
     if not self.is_visible:
       return None
 
@@ -56,6 +58,9 @@ class Widget(abc.ABC):
   def _render(self, rect: rl.Rectangle) -> bool | int | None:
     """Render the widget within the given rectangle."""
 
+  def _update_state(self):
+    """Optionally update the widget's non-layout state. This is called before rendering."""
+
   def _update_layout_rects(self) -> None:
     """Optionally update any layout rects on Widget rect change."""