Update echart.py

nicegui/elements/echart.py

@@ -1,11 +1,14 @@
-from typing import Dict
+from typing import Callable, Dict, Optional
 
 from ..element import Element
+from ..events import (EChartPointClickEventArguments, GenericEventArguments, handle_event)
 
 
 class EChart(Element, component='echart.js', libraries=['lib/echarts/echarts.min.js']):
 
-    def __init__(self, options: Dict) -> None:
+    def __init__(self, options: Dict,
+            on_point_click: Optional[Callable] = None,
+            ) -> None:
         """Apache EChart
 
         An element to create a chart using `ECharts <https://echarts.apache.org/>`_.
@@ -13,11 +16,41 @@ class EChart(Element, component='echart.js', libraries=['lib/echarts/echarts.min
         After data has changed, call the `update` method to refresh the chart.
 
         :param options: dictionary of EChart options
+        :param on_click_point: callback function that is called when a point is clicked
         """
         super().__init__()
         self._props['options'] = options
         self._classes = ['nicegui-echart']
 
+        if on_point_click:
+            def handle_point_click(e: GenericEventArguments) -> None:
+                handle_event(on_point_click, EChartPointClickEventArguments(
+                    sender=self,
+                    client=self.client,
+                    event_type='point_click',
+                    component_type=e.args['component_type'],
+                    series_type=e.args['series_type'],
+                    series_index=e.args['series_index'],
+                    series_name=e.args['series_name'],
+                    name=e.args['name'],
+                    data_index=e.args['data_index'],
+                    data=e.args['data'],
+                    data_type=e.args.get('data_type'),
+                    value=e.args['value'],
+                ))
+            
+            self.on('pointClick', handle_point_click, [
+                'component_type', 
+                'series_type',
+                'series_index', 
+                'series_name',
+                'name',
+                'data_index', 
+                'data',
+                'data_type',
+                'value',
+                ])
+
     @property
     def options(self) -> Dict:
         return self._props['options']