Add shiny for python example

Author: Stefan Kuethe

shiny/app.py

@@ -0,0 +1,32 @@
+import openlayers as ol
+from shiny.express import render, ui, input
+from shiny import reactive
+
+from shinywidgets import render_widget, reactive_read
+
+city_centers = {
+    "London": (51.5074, 0.1278),
+    "Paris": (48.8566, 2.3522),
+    "New York": (40.7128, -74.0060)
+}
+
+ui.input_select("center", "Center", choices=list(city_centers.keys()))
+
+@render_widget
+def ol_map():
+    lat, lon = city_centers["London"]
+    m = ol.MapWidget()
+    m.set_center(lon, lat)
+    m.set_zoom(8)
+    return m
+
+
+@render.code
+def info():
+    view_state = reactive_read(ol_map.widget, "view_state")
+    return str(view_state)
+
+@reactive.effect
+def _():
+    lat, lon = city_centers[input.center()]
+    ol_map.widget.set_center(lon, lat)