Update src/streamlit_app.py

src/streamlit_app.py

@@ -109,39 +109,40 @@ draw = Draw(
 )
 m.add_child(draw)
 
-st.subheader("Draw a Polygon on the Map")
-st.info("Draw a polygon on the map to spatially filter properties. The filtered results will appear below.")
-output = st_folium(m, width=1000, height=600, returned_objects=["all_draw_features"])
-
-polygon_drawn = False
-shapely_polygon = None
-polygon_coords = None
-
-if output and output["all_draw_features"]:
-    polygons = [
-        feature["geometry"]["coordinates"]
-        for feature in output["all_draw_features"]
-        if feature["geometry"]["type"] == "Polygon"
-    ]
-
-    if polygons:
-        polygon_coords = polygons[-1][0] # Get the coordinates of the last drawn polygon
-        # Shapely Polygon expects (lon, lat) tuples, Folium provides (lat, lon)
-        shapely_polygon = Polygon([(lon, lat) for lat, lon in polygon_coords])
-        polygon_drawn = True
-
-        # Apply spatial filter to the full dataframe based on centroid containment
-        filtered_df = df[
-            df.apply(
-                lambda row: shapely_polygon.contains(Point(row['longitude'], row['latitude'])),
-                axis=1
-            )
-        ].copy()
-        st.success(f"Initially filtered {len(filtered_df)} properties within the drawn polygon.")
+with st.expander("Draw a polygon on the map to spatially filter properties"):
+    st.subheader("Draw a Polygon on the Map")
+    st.info("Draw a polygon on the map to spatially filter properties. The filtered results will appear below.")
+    output = st_folium(m, width=1000, height=600, returned_objects=["all_draw_features"])
+    
+    polygon_drawn = False
+    shapely_polygon = None
+    polygon_coords = None
+    
+    if output and output["all_draw_features"]:
+        polygons = [
+            feature["geometry"]["coordinates"]
+            for feature in output["all_draw_features"]
+            if feature["geometry"]["type"] == "Polygon"
+        ]
+    
+        if polygons:
+            polygon_coords = polygons[-1][0] # Get the coordinates of the last drawn polygon
+            # Shapely Polygon expects (lon, lat) tuples, Folium provides (lat, lon)
+            shapely_polygon = Polygon([(lon, lat) for lat, lon in polygon_coords])
+            polygon_drawn = True
+    
+            # Apply spatial filter to the full dataframe based on centroid containment
+            filtered_df = df[
+                df.apply(
+                    lambda row: shapely_polygon.contains(Point(row['longitude'], row['latitude'])),
+                    axis=1
+                )
+            ].copy()
+            st.success(f"Initially filtered {len(filtered_df)} properties within the drawn polygon.")
+        else:
+            st.info("No polygon drawn yet. Draw a polygon on the map to spatially filter properties.")
     else:
         st.info("No polygon drawn yet. Draw a polygon on the map to spatially filter properties.")
-else:
-    st.info("No polygon drawn yet. Draw a polygon on the map to spatially filter properties.")
 
 # --- 3. Attribute Filtering Form ---
 st.subheader("Filter Property Attributes")