Add Streamlit Custom Component to Refresh Panel

src/nipanel/_streamlit_constants.py

@@ -1 +1,2 @@
 STREAMLIT_PYTHON_PANEL_SERVICE = "ni.pythonpanel.v1.PythonPanelService"
+STREAMLIT_REFRESH_COMPONENT_URL = "http://localhost:42001/panels/refresh"

src/nipanel/_streamlit_panel_initializer.py

@@ -3,6 +3,7 @@
 import streamlit as st
 
 from nipanel._streamlit_panel_value_accessor import StreamlitPanelValueAccessor
+from nipanel.streamlit_refresh import initialize_refresh_component
 
 PANEL_ACCESSOR_KEY = "StreamlitPanelValueAccessor"
 
@@ -22,7 +23,8 @@ def initialize_panel() -> StreamlitPanelValueAccessor:
         st.session_state[PANEL_ACCESSOR_KEY] = _initialize_panel_from_base_path()
 
     panel = cast(StreamlitPanelValueAccessor, st.session_state[PANEL_ACCESSOR_KEY])
-    # TODO: declare the refresh component here
+    refresh_component = initialize_refresh_component(panel.panel_id)
+    refresh_component()
     return panel
 
 

src/nipanel/streamlit_refresh/__init__.py

@@ -0,0 +1,17 @@
+"""Initializes a refresh component for Streamlit."""
+
+from typing import Any
+
+import streamlit.components.v1 as components
+
+from nipanel._streamlit_constants import STREAMLIT_REFRESH_COMPONENT_URL
+
+
+def initialize_refresh_component(panel_id: str) -> Any:
+    """Initialize a refresh component to the Streamlit app."""
+    _refresh_component_func = components.declare_component(
+        "panelRefreshComponent",
+        url=f"{STREAMLIT_REFRESH_COMPONENT_URL}/{panel_id}",
+    )
+
+    return _refresh_component_func