Skip to main content

ListView

A scrollable list of controls arranged linearly.

ListView is the most commonly used scrolling control. It displays its children one after another in the scroll direction. In the cross axis, the children are required to fill the ListView.

info

ListView is very effective for large lists (thousands of items). Prefer it over Column or Row for smooth scrolling.

Examples

Live example

Auto-scrolling ListView

from time import sleep
import flet as ft

def main(page: ft.Page):
page.title = "Auto-scrolling ListView"

lv = ft.ListView(expand=1, spacing=10, padding=20, auto_scroll=True)

count = 1

for i in range(0, 60):
lv.controls.append(ft.Text(f"Line {count}"))
count += 1

page.add(lv)

for i in range(0, 60):
sleep(1)
lv.controls.append(ft.Text(f"Line {count}"))
count += 1
page.update()

ft.app(target=main)

Properties

auto_scroll

True if scrollbar should automatically move its position to the end when children updated. Must be False for scroll_to() method to work.

cache_extent

Items that fall in the cache area (area before or after the visible area that are about to become visible when the user scrolls) are laid out even though they are not (yet) visible on screen. The cacheExtent describes how many pixels the cache area extends before the leading edge and after the trailing edge of the viewport.

The total extent, which the viewport will try to cover with controls, is cache_extent before the leading edge + extent of the main axis + cache_extent after the trailing edge.

clip_behavior

The content will be clipped (or not) according to this option. See Container.clip_behavior for possible values.

Default value is ClipBehavior.HARD_EDGE.

controls

A list of Controls to display inside ListView.

divider_thickness

If greater than 0 then Divider is used as a spacing between ListView items.

first_item_prototype

True if the dimensions of the first item should be used as a "prototype" for all other items, i.e. their height or width will be the same as the first item. Default is False.

horizontal

True to layout ListView items horizontally.

item_extent

A fixed height or width (for horizontal ListView) of an item to optimize rendering.

on_scroll_interval

Throttling in milliseconds for on_scroll event. Default is 10.

padding

The amount of space by which to inset the children.

See Container.padding property for more information and possible values.

reverse

Defines whether the scroll view scrolls in the reading direction. Defaults to False.

semantic_child_count

The number of children that will contribute semantic information.

spacing

The height of Divider between ListView items. No spacing between items if not specified.

Methods

scroll_to(offset, delta, key, duration, curve)

Moves scroll position to either absolute offset, relative delta or jump to the control with specified key.

See Column.scroll_to() for method details and examples.

Events

on_scroll

Fires when scroll position is changed by a user.

See Column.on_scroll for event details and examples.