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RangeSlider

A Material Design range slider. Used to select a range from a range of values. A range slider can be used to select from either a continuous or a discrete set of values. The default is to use a continuous range of values from min to max.

Examples​

Live example

Range slider with divisions and labels​

import flet as ft


def main(page: ft.Page):
    range_slider = ft.RangeSlider(
        min=0,
        max=50,
        start_value=10,
        divisions=10,
        end_value=20,
        inactive_color=ft.colors.GREEN_300,
        active_color=ft.colors.GREEN_700,
        overlay_color=ft.colors.GREEN_100,
        label="{value}%",
    )

    page.add(
        ft.Column(
            horizontal_alignment=ft.CrossAxisAlignment.CENTER,
            controls=[
                ft.Text(
                    "Range slider with divisions and labels",
                    size=20,
                    weight=ft.FontWeight.BOLD,
                ),
                ft.Container(height=30),
                range_slider,
            ],
        )
    )


ft.app(target=main)

RangeSlider with events​

import flet as ft


def main(page: ft.Page):
    def slider_change_start(e):
        print(f"on_change_start: {e.control.start_value}, {e.control.end_value}")

    def slider_is_changing(e):
        print(f"on_change: {e.control.start_value}, {e.control.end_value}")

    def slider_change_end(e):
        print(f"on_change_end: {e.control.start_value}, {e.control.end_value}")

    range_slider = ft.RangeSlider(
        min=0,
        max=50,
        start_value=10,
        end_value=20,
        on_change_start=slider_change_start,
        on_change=slider_is_changing,
        on_change_end=slider_change_end,
    )

    page.add(
        ft.Column(
            horizontal_alignment=ft.CrossAxisAlignment.CENTER,
            controls=[
                ft.Text(
                    "Range slider with events",
                    size=20,
                    weight=ft.FontWeight.BOLD,
                ),
                ft.Container(height=30),
                range_slider,
            ],
        )
    )


ft.app(target=main)

Properties​

active_color​

The color to use for the portion of the slider track that is active.

The "active" segment of the range slider is the span between the thumbs.

divisions​

The number of discrete divisions.

Typically used with label to show the current discrete values.

If not set, the slider is continuous.

end_value​

The currently selected end value for the slider.

The slider's right thumb is drawn at a position that corresponds to this value.

inactive_color​

The color for the inactive portions of the slider track.

The "inactive" segments of the slider are the span of tracks between the min and the start thumb, and the end thumb and the max.

label​

A label to show above the slider thumbs when the slider is active. The value of label may contain {value} which will be replaced with a current slider start_value and end_value.

If not set, then the labels will not be displayed.

max​

The maximum value the user can select.

Defaults to 1.0. Must be greater than or equal to min.

If the max is equal to the min, then the slider is disabled.

min​

The minimum value the user can select.

Defaults to 0.0. Must be less than or equal to max.

If the max is equal to the min, then the slider is disabled.

overlay_color​

The highlight color that's typically used to indicate that the range slider thumb is hovered or dragged. See Radio.fill_color for usage examples.

round​

The number of decimals displayed on the label containing {value}. The default is 0 (displays value rounded to the nearest integer).

start_value​

The currently selected start value for the slider.

The slider's left thumb is drawn at a position that corresponds to this value.

Events​

on_change​

Fires when the state of the Slider is changed.

on_change_end​

Fires when the user is done selecting a new value for the slider.

on_change_start​

Fires when the user starts selecting a new value for the slider.