flet-circular-slider 0.1.1

Circular/radial slider control for Flet, wrapping sleek_circular_slider Flutter package

flet-circular-slider

A circular/radial slider control for Flet, wrapping the sleek_circular_slider Flutter package.

Install

pip install flet-circular-slider

Then register it as a Flet extension in your project's pyproject.toml so the Flutter widget gets compiled:

[project]
dependencies = ["flet-circular-slider>=0.1.0"]

[tool.flet.dev_packages]
flet-circular-slider = ">=0.1.0"

Then run flet build (see Building below). flet run alone won't compile extensions — you'll get "Unknown control" without a build step.

Quick Start

import flet as ft
from flet_circular_slider import FletCircularSlider

def main(page: ft.Page):
    page.bgcolor = "#1a1a2e"

    slider = FletCircularSlider(
        min=0, max=100, value=25, size=200,
        on_change=lambda e: print(int(float(e.data))),
    )
    page.add(slider)

ft.run(main)

Examples

• basic.py — Minimal slider with on_change event
• advanced.py — Custom colors, geometry, labels, sizing, and all three events

Properties

Property	Type	Default	Description
min	float	0	Minimum value
max	float	100	Maximum value
value	float	50	Initial value
size	float	150	Diameter in pixels
start_angle	float	150	Arc start angle (degrees)
angle_range	float	240	Arc total range (degrees)
counter_clockwise	bool	False	Reverse drag direction
animation_enabled	bool	True	Animate to initial value
progress_bar_width	float	size/10	Progress arc width
track_width	float	bar/4	Background track width
handler_size	float	bar/5	Drag handle size
progress_bar_start_color	ColorValue	purple	Gradient start color
progress_bar_end_color	ColorValue	pink	Gradient end color
track_color	ColorValue	light purple	Track color
dot_color	ColorValue	white	Handle dot color
shadow_color	ColorValue	blue	Shadow color
hide_shadow	bool	False	Remove the shadow
inner_text_color	ColorValue	gradient end	Center text color
inner_text	str	raw value	Center text ({value} placeholder)
top_label	str	none	Label above center
bottom_label	str	none	Label below center

Events

Event	e.data	Description
on_change	current value	Fires continuously while dragging
on_change_start	value at drag start	Fires once when drag begins
on_change_end	value at drag end	Fires once when drag ends

Building

Custom Flet extensions require flet build to compile Dart/Flutter code. flet run alone shows "Unknown control" because it uses a pre-built binary.

flet build web       # no extra tooling needed
flet build windows   # requires Visual Studio C++ workload
flet build apk       # Android
flet build macos     # macOS

After building, flet run works for Python-only changes. Rebuild when you change Dart code.

License

MIT