step 4: add digital bar level and status gauges

src/dpg_gauges/widget.py

@@ -132,6 +132,8 @@ def create_gauge_context(gauge_type: str, config: ConfigT) -> GaugeContext[Confi
     )
     renderer = GaugeRenderer(state)
     state.renderer = renderer
+    if config.callback is not None:
+        dpg.configure_item(drawlist, callback=_item_callback, user_data=state.tag)
     renderer.render()
     return GaugeContext(state)
 
@@ -225,3 +227,11 @@ def _add_tooltip(parent: Tag, tooltip: str | None) -> None:
         return
     tooltip_tag = dpg.add_tooltip(parent)
     dpg.add_text(tooltip, parent=tooltip_tag)
+
+
+def _item_callback(_sender: Tag, _app_data: object, user_data: Tag) -> None:
+    from .state import get_gauge_state
+
+    state = get_gauge_state(user_data)
+    if state.config.callback is not None:
+        state.config.callback(state.tag, state.target_value, state.config.user_data)