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Dismissible

A control that can be dismissed by dragging in the indicated dismiss_direction. When dragged or flung in the specified dismiss_direction, its content smoothly slides out of view.

After completing the sliding animation, if a resize_duration is provided, this control further animates its height (or width, depending on what is perpendicular to the dismiss_direction), gradually reducing it to zero over the specified resize_duration.

Inherits: LayoutControl, AdaptiveControl

Properties

Events

Methods

Examples#

Live example

Dismissable ListTiles#

import flet as ft


def main(page: ft.Page):
    async def handle_dialog_action_click(e: ft.Event[ft.TextButton]):
        page.pop_dialog()
        await dlg.data.confirm_dismiss(e.control.data)

    dlg = ft.AlertDialog(
        modal=True,
        title=ft.Text("Please confirm"),
        content=ft.Text("Do you really want to delete this item?"),
        actions=[
            ft.TextButton("Yes", data=True, on_click=handle_dialog_action_click),
            ft.TextButton("No", data=False, on_click=handle_dialog_action_click),
        ],
        actions_alignment=ft.MainAxisAlignment.CENTER,
    )

    async def handle_confirm_dismiss(e: ft.DismissibleDismissEvent):
        if e.direction == ft.DismissDirection.END_TO_START:  # right-to-left slide
            # save current dismissible to dialog's data, for confirmation in
            # handle_dialog_action_click
            dlg.data = e.control
            page.show_dialog(dlg)
        else:  # left-to-right slide
            await e.control.confirm_dismiss(True)

    def handle_dismiss(e):
        e.control.parent.controls.remove(e.control)
        page.update()

    def handle_update(e: ft.DismissibleUpdateEvent):
        print(e)

    page.add(
        ft.ListView(
            expand=True,
            controls=[
                ft.Dismissible(
                    content=ft.ListTile(title=ft.Text(f"Item {i}")),
                    dismiss_direction=ft.DismissDirection.HORIZONTAL,
                    background=ft.Container(bgcolor=ft.Colors.GREEN),
                    secondary_background=ft.Container(bgcolor=ft.Colors.RED),
                    on_dismiss=handle_dismiss,
                    on_update=handle_update,
                    on_confirm_dismiss=handle_confirm_dismiss,
                    dismiss_thresholds={
                        ft.DismissDirection.END_TO_START: 0.2,
                        ft.DismissDirection.START_TO_END: 0.2,
                    },
                )
                for i in range(10)
            ],
        )
    )


ft.run(main)

dismissable-list-tiles

Properties#

background #

background: Control | None = None

A control that is stacked behind the content.

If secondary_background is also specified, then this control only appears when the content has been dragged down or to the right.

content #

content: Control

The control that is being dismissed.

Must be visible.

Raises:

cross_axis_end_offset #

cross_axis_end_offset: Number = 0.0

Specifies the end offset along the main axis once the content has been dismissed.

If set to a non-zero value, then this dismissible moves in cross direction depending on whether it is positive or negative.

dismiss_direction #

dismiss_direction: DismissDirection = HORIZONTAL

The direction in which the control can be dismissed.

dismiss_thresholds #

dismiss_thresholds: dict[
    DismissDirection, Number | None
] = field(default_factory=dict)

The offset threshold the item has to be dragged in order to be considered as dismissed. This is specified as a dictionary where the key is of type DismissDirection and the value is the threshold (a fractional/decimal value between 0.0 and 1.0, inclusive).

Example 
ft.Dismissible(
    # ...
    dismiss_thresholds={
        ft.DismissDirection.VERTICAL: 0.1,
        ft.DismissDirection.START_TO_END: 0.7
    }
)

movement_duration #

movement_duration: DurationValue = field(
    default_factory=lambda: Duration(milliseconds=200)
)

The duration for content to dismiss or to come back to original position if not dismissed.

resize_duration #

resize_duration: DurationValue = field(
    default_factory=lambda: Duration(milliseconds=300)
)

The amount of time the control will spend contracting before on_dismiss is called.

secondary_background #

secondary_background: Control | None = None

A control that is stacked behind the content and is exposed when it has been dragged up or to the left.

Note

Can only be specified if background is also specified/visible.

Raises:

Events#

on_confirm_dismiss #

on_confirm_dismiss: (
    EventHandler[DismissibleDismissEvent] | None
) = None

Gives the app an opportunity to confirm or veto a pending dismissal. This dismissible cannot be dragged again until this pending dismissal is resolved.

To resolve the pending dismissal, call the confirm_dismiss() method passing it a boolean representing the decision. If True, then the control will be dismissed, otherwise it will be moved back to its original location.

on_dismiss #

on_dismiss: EventHandler[DismissibleDismissEvent] | None = (
    None
)

Called when this control has been dismissed, after finishing resizing.

on_resize #

on_resize: ControlEventHandler[Dismissible] | None = None

Called when this dismissible changes size, for example, when contracting before being dismissed.

on_update #

on_update: EventHandler[DismissibleUpdateEvent] | None = (
    None
)

Called when this control has been dragged.

Methods#

confirm_dismiss #

confirm_dismiss(dismiss: bool)