Add Pico touch routing abstraction

pico-dashboard/hardware/touch.py

@@ -0,0 +1,21 @@
+class TouchEvent:
+    def __init__(self, x, y, pressed=True):
+        self.x = x
+        self.y = y
+        self.pressed = pressed
+
+
+class TouchController:
+    def __init__(self, touch_device=None):
+        self.touch_device = touch_device
+
+    def read_event(self):
+        if not self.touch_device:
+            return None
+
+        point = self.touch_device.read()
+
+        if not point:
+            return None
+
+        return TouchEvent(point["x"], point["y"], point.get("pressed", True))

pico-dashboard/ui/touch_router.py

@@ -0,0 +1,38 @@
+NAV_ITEMS = [
+    ("dashboard", 0, 64),
+    ("battery", 64, 128),
+    ("temps", 128, 192),
+    ("power", 192, 256),
+    ("system", 256, 320),
+]
+
+
+class TouchRouter:
+    def __init__(self, screen_manager, width=320, height=480, nav_height=56):
+        self.screen_manager = screen_manager
+        self.width = width
+        self.height = height
+        self.nav_height = nav_height
+
+    def handle_touch(self, event):
+        if not event or not event.pressed:
+            return False
+
+        if self._is_bottom_nav(event.y):
+            screen = self._screen_for_nav_x(event.x)
+
+            if screen:
+                self.screen_manager.go_to(screen)
+                return True
+
+        return False
+
+    def _is_bottom_nav(self, y):
+        return y >= self.height - self.nav_height
+
+    def _screen_for_nav_x(self, x):
+        for screen, start_x, end_x in NAV_ITEMS:
+            if start_x <= x < end_x:
+                return screen
+
+        return None

tests/test_pico_core.py

@@ -668,3 +668,57 @@ def test_buzzer_updates_from_alarm_view():
 
     assert buzzer.enabled is False
     assert buzzer.pattern is None
+
+
+def test_touch_controller_reads_event():
+    from hardware.touch import TouchController
+
+    class FakeTouchDevice:
+        def read(self):
+            return {"x": 100, "y": 200, "pressed": True}
+
+    controller = TouchController(FakeTouchDevice())
+    event = controller.read_event()
+
+    assert event.x == 100
+    assert event.y == 200
+    assert event.pressed is True
+
+
+def test_touch_router_bottom_nav_changes_screen():
+    from hardware.touch import TouchEvent
+    from ui.touch_router import TouchRouter
+
+    screens = ScreenManager()
+    router = TouchRouter(screens)
+
+    handled = router.handle_touch(TouchEvent(200, 460, True))
+
+    assert handled is True
+    assert screens.current_screen == "power"
+
+
+def test_touch_router_ignores_non_nav_touch():
+    from hardware.touch import TouchEvent
+    from ui.touch_router import TouchRouter
+
+    screens = ScreenManager()
+    router = TouchRouter(screens)
+
+    handled = router.handle_touch(TouchEvent(200, 200, True))
+
+    assert handled is False
+    assert screens.current_screen == "dashboard"
+
+
+def test_touch_router_ignores_unpressed_event():
+    from hardware.touch import TouchEvent
+    from ui.touch_router import TouchRouter
+
+    screens = ScreenManager()
+    router = TouchRouter(screens)
+
+    handled = router.handle_touch(TouchEvent(200, 460, False))
+
+    assert handled is False
+    assert screens.current_screen == "dashboard"