ExpansionPanelListChangeEvent

Inherits: Event['ExpansionPanelList']

Payload for ExpansionPanelList.on_change event.

Properties

• expanded(bool) –

  Whether the toggled panel is expanded (True) or

• index(int) –

  The index of the panel in ExpansionPanelList.controls that was toggled.

Properties

expanded instance-attribute

expanded: bool

Whether the toggled panel is expanded (True) or collapsed (False) after the event.

index instance-attribute

index: int

The index of the panel in ExpansionPanelList.controls that was toggled.

Panels with visible set to False are not counted/indexed. This means the value may differ from the panel's position in the original ExpansionPanelList.controls list when some panels are invisible. To map it back, filter ExpansionPanelList.controls to only visible panels and use this index on that filtered list.