ScrollDirection
User scroll direction reported by Flutter user-scroll notifications.
Used by OnScrollEvent.direction when
OnScrollEvent.event_type is ScrollType.USER.
Examples#
Showcase#
import flet as ft
def main(page: ft.Page):
page.horizontal_alignment = ft.CrossAxisAlignment.CENTER
counts = {direction: 0 for direction in ft.ScrollDirection}
count_labels = {
direction: ft.Text(f"{direction.name}: 0") for direction in ft.ScrollDirection
}
def on_scroll(e: ft.OnScrollEvent):
if e.event_type == ft.ScrollType.USER and e.direction is not None:
counts[e.direction] += 1
count_labels[
e.direction
].value = f"{e.direction.name}: {counts[e.direction]}"
last.value = f"Last USER direction: {e.direction.name}"
for label in count_labels.values():
label.update()
last.update()
page.appbar = ft.AppBar(title="ScrollDirection Showcase")
page.add(
ft.SafeArea(
content=ft.Column(
controls=[
ft.Text("Scroll the list and watch USER direction notifications."),
last := ft.Text("Last USER direction: none"),
ft.Row(
wrap=True,
spacing=10,
controls=[count_labels[d] for d in ft.ScrollDirection],
alignment=ft.MainAxisAlignment.CENTER,
),
ft.Container(
width=360,
height=240,
border=ft.Border.all(1, ft.Colors.OUTLINE),
border_radius=8,
padding=8,
content=ft.Column(
scroll=ft.ScrollMode.ALWAYS,
on_scroll=on_scroll,
controls=[
ft.Text(f"Scrollable item {i + 1}") for i in range(60)
],
),
),
],
),
)
)
if __name__ == "__main__":
ft.run(main)