code review

nicegui/elements/highchart.py

@@ -1,15 +1,15 @@
-from nicegui import ui
-
 from .. import optional_features
+from ..element import Element
 from ..logging import log
+from .markdown import Markdown
 
 try:
     from nicegui_highcharts import highchart
     optional_features.register('highcharts')
     __all__ = ['highchart']
 except ImportError:
-    class highchart(ui.element):  # type: ignore
-        def __init__(self, *args, **kwargs) -> None:
+    class highchart(Element):  # type: ignore
+        def __init__(self, *args, **kwargs) -> None:  # pylint: disable=unused-argument
             """Highcharts chart
 
             An element to create a chart using `Highcharts <https://www.highcharts.com/>`_.
@@ -21,5 +21,5 @@ except ImportError:
             and can be installed with `pip install nicegui[highcharts]`.
             """
             super().__init__()
-            ui.markdown('Highcharts is not installed. Please run `pip install nicegui[highcharts]`.')
+            Markdown('Highcharts is not installed. Please run `pip install nicegui[highcharts]`.')
             log.warning('Highcharts is not installed. Please run "pip install nicegui[highcharts]".')