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ExpansionPanelList

A material expansion panel list that lays out its children and animates expansions.

Examples​

Live example

Simple Example​

import flet as ft


def main(page: ft.Page):
    def handle_change(e: ft.ControlEvent):
        print(f"change on panel with index {e.data}")

    def handle_delete(e: ft.ControlEvent):
        panel.controls.remove(e.control.data)
        page.update()

    panel = ft.ExpansionPanelList(
        expand_icon_color=ft.colors.AMBER,
        elevation=8,
        divider_color=ft.colors.AMBER,
        on_change=handle_change,
        controls=[
            ft.ExpansionPanel(
                # has no header and content - placeholders will be used
                bgcolor=ft.colors.BLUE_400,
                expanded=True,
            )
        ]
    )

    colors = [
        ft.colors.GREEN_500,
        ft.colors.BLUE_800,
        ft.colors.RED_800,
    ]
    
    for i in range(3):
        exp = ft.ExpansionPanel(
            bgcolor=colors[i % len(colors)],
            header=ft.ListTile(title=ft.Text(f"Panel {i}")),
        )

        exp.content = ft.ListTile(
            title=ft.Text(f"This is in Panel {i}"),
            subtitle=ft.Text(f"Press the icon to delete panel {i}"),
            trailing=ft.IconButton(ft.icons.DELETE, on_click=handle_delete, data=exp),
        )

        panel.controls.append(exp)

    page.add(panel)


ft.app(target=main)

ExpansionPanelList Properties​

controls​

A list of ExpansionPanels to display inside ExpansionPanelList.

divider_color​

The color of the divider when ExpansionPanel.expanded is False.

elevation​

Defines the elevation of the children controls (ExpansionPanels), while it is expanded. Default value is 2.

expanded_header_padding​

Defines the padding around the header when expanded.

Padding value is an instance of Padding class. Default value is padding.symmetric(vertical=16.0).

expanded_icon_color​

The color of the icon. Defaults to colors.BLACK_54 in light theme mode and colors.WHITE_60 in dark theme mode.

spacing​

The size of the gap between the ExpansionPanels when expanded.

Events​

on_change​

Fires when an ExpansionPanel is expanded or collapsed. The event's data (e.data), contains the index of the ExpansionPanel which triggered this event.

ExpansionPanel properties​

bgcolor​

The background color of the panel.

content​

The control to be found in the body of the ExpansionPanel. It is displayed below the header when the panel is expanded.

If this property is None, the ExpansionPanel will have a placeholder Text as content.

can_tap_header​

If True, tapping on the panel's header will expand or collapse it. Defaults to False.

expanded​

Whether expanded(True) or collapsed(False). Defaults to False.

The control to be found in the header of the ExpansionPanel. If can_tap_header is True, tapping on the header will expand or collapse the panel.

If this property is None, the ExpansionPanel will have a placeholder Text as header.