SegmentedButton

Examples#

Basic Example#

import flet as ft


def main(page: ft.Page):
    def handle_selection_change(e: ft.Event[ft.SegmentedButton]):
        print(e)

    page.add(
        ft.SegmentedButton(
            on_change=handle_selection_change,
            selected_icon=ft.Icon(ft.Icons.CHECK_SHARP),
            selected=["1"],
            allow_empty_selection=True,
            allow_multiple_selection=True,
            segments=[
                ft.Segment(
                    value="1",
                    label=ft.Text("1"),
                    icon=ft.Icon(ft.Icons.LOOKS_ONE),
                ),
                ft.Segment(
                    value="2",
                    label=ft.Text("2"),
                    icon=ft.Icon(ft.Icons.LOOKS_TWO),
                ),
                ft.Segment(
                    value="3",
                    label=ft.Text("3"),
                    icon=ft.Icon(ft.Icons.LOOKS_3),
                ),
                ft.Segment(
                    value="4",
                    label=ft.Text("4"),
                    icon=ft.Icon(ft.Icons.LOOKS_4),
                ),
            ],
        ),
        ft.SegmentedButton(
            on_change=handle_selection_change,
            selected_icon=ft.Icon(ft.Icons.ONETWOTHREE),
            selected=["2"],
            allow_multiple_selection=False,
            segments=[
                ft.Segment(
                    value="1",
                    label=ft.Text("1"),
                    icon=ft.Icon(ft.Icons.LOOKS_ONE),
                ),
                ft.Segment(
                    value="2",
                    label=ft.Text("2"),
                    icon=ft.Icon(ft.Icons.LOOKS_TWO),
                ),
                ft.Segment(
                    value="3",
                    label=ft.Text("3"),
                    icon=ft.Icon(ft.Icons.LOOKS_3),
                ),
                ft.Segment(
                    value="4",
                    label=ft.Text("4"),
                    icon=ft.Icon(ft.Icons.LOOKS_4),
                ),
            ],
        ),
    )


ft.run(main)

SegmentedButton #

Bases: ConstrainedControl

A segmented button control.

RAISES	DESCRIPTION
`AssertionError`	If `segments` is empty or does not have at least one visible `Segment`.
`AssertionError`	If `selected` is empty and `allow_empty_selection` is `False`.
`AssertionError`	If `selected` has more than one item and `allow_multiple_selection` is `False`.

allow_empty_selection #

allow_empty_selection: bool = False

A boolean value that indicates if having no selected segments is allowed.

If True, then it is acceptable for none of the segments to be selected and also that selected can be empty.

If False (the default), there must be at least one segment selected. If the user taps on the only selected segment it will not be deselected, and on_change will not be called.

allow_multiple_selection #

allow_multiple_selection: bool = False

A boolean value that indicates if multiple segments can be selected at one time.

If True, more than one segment can be selected. When selecting a segment, the other selected segments will stay selected. Selecting an already selected segment will unselect it.

If False (the default), only one segment may be selected at a time. When a segment is selected, any previously selected segment will be unselected.

animate_offset #

animate_offset: AnimationValue | None = None

Enables implicit animation of the offset property.

More information here.

animate_opacity #

animate_opacity: AnimationValue | None = None

Enables implicit animation of the opacity property.

More information here.

animate_position #

animate_position: AnimationValue | None = None

Enables implicit animation of the positioning properties (left, right, top and bottom).

More information here.

animate_rotation #

animate_rotation: AnimationValue | None = None

Enables implicit animation of the rotate property.

More information here.

animate_scale #

animate_scale: AnimationValue | None = None

Enables implicit animation of the scale property.

More information here.

animate_size #

animate_size: AnimationValue | None = None

TBD

aspect_ratio #

aspect_ratio: Number | None = None

TBD

badge #

badge: BadgeValue | None = None

A badge to show on top of this control.

bottom #

bottom: Number | None = None

The distance that the child's bottom edge is inset from the bottom of the stack.

Note

Effective only if this control is a descendant of one of the following: Stack control, Page.overlay list.

col #

col: ResponsiveNumber = 12

If a parent of this control is a ResponsiveRow, this property is used to determine how many virtual columns of a screen this control will span.

Can be a number or a dictionary configured to have a different value for specific breakpoints, for example col={"sm": 6}.

This control spans the 12 virtual columns by default.

Dimensions

Breakpoint	Dimension
xs	<576px
sm	≥576px
md	≥768px
lg	≥992px
xl	≥1200px
xxl	≥1400px

data #

data: Any = skip_field()

Arbitrary data of any type.

direction #

direction: Axis | None = None

The orientation of the button's segments.

Defaults to Axis.HORIZONTAL.

disabled #

disabled: bool = False

Every control has disabled property which is False by default - control and all its children are enabled.

Note

The value of this property will be propagated down to all children controls recursively.

Example

For example, if you have a form with multiple entry controls you can disable them all together by disabling container:

ft.Column(
    disabled = True,
    controls=[
        ft.TextField(),
        ft.TextField()
    ]
)

expand #

expand: bool | int | None = None

Specifies whether/how this control should expand to fill available space in its parent layout.

More information here.

Note

Has effect only if the direct parent of this control is one of the following controls, or their subclasses: Column, Row, View, Page.

expand_loose #

expand_loose: bool = False

Allows the control to expand along the main axis if space is available, but does not require it to fill all available space.

More information here.

Note

If expand_loose is True, it will have effect only if:

expand is not None and
the direct parent of this control is one of the following controls, or their subclasses: Column, Row, View, Page.

height #

height: Number | None = None

Imposed Control height in virtual pixels.

key #

key: (
    str | int | float | bool | ValueKey | ScrollKey | None
) = None

left #

left: Number | None = None

The distance that the child's left edge is inset from the left of the stack.

Note

Effective only if this control is a descendant of one of the following: Stack control, Page.overlay list.

offset #

offset: OffsetValue | None = None

Applies a translation transformation before painting the control.

The translation is expressed as an Offset scaled to the control's size. So, Offset(x=0.25, y=0), for example, will result in a horizontal translation of one quarter the width of this control.

Example

The following example displays container at 0, 0 top left corner of a stack as transform applies -1 * 100, -1 * 100 (offset * control's size) horizontal and vertical translations to the control:

import flet as ft

def main(page: ft.Page):
    page.add(
        ft.Stack(
            width=1000,
            height=1000,
            controls=[
                ft.Container(
                    bgcolor="red",
                    width=100,
                    height=100,
                    left=100,
                    top=100,
                    offset=ft.Offset(-1, -1),
                )
            ],
        )
    )

ft.run(main)

on_animation_end #

on_animation_end: (
    ControlEventHandler[ConstrainedControl] | None
) = None

Called when animation completes.

Can be used to chain multiple animations.

The data property of the event handler argument contains the name of the animation.

More information here.

on_change #

on_change: ControlEventHandler[SegmentedButton] | None = (
    None
)

Called when the selection changes.

The data property of the event handler argument contains a list of strings identifying the selected segments.

opacity #

opacity: Number = 1.0

Defines the transparency of the control.

Value ranges from 0.0 (completely transparent) to 1.0 (completely opaque without any transparency).

padding #

padding: PaddingValue | None = None

Defines the button's size and padding. If specified, the button expands to fill its parent's space with this padding.

When None, the button adopts its intrinsic content size.

page #

page: Page | PageView | None

The page (of type Page or PageView) to which this control belongs to.

parent #

parent: BaseControl | None

The direct ancestor(parent) of this control.

It defaults to None and will only have a value when this control is mounted (added to the page tree).

The Page control (which is the root of the tree) is an exception - it always has parent=None.

right #

right: Number | None = None

The distance that the child's right edge is inset from the right of the stack.

Note

Effective only if this control is a descendant of one of the following: Stack control, Page.overlay list.

rotate #

rotate: RotateValue | None = None

Transforms this control using a rotation around its center.

The value of rotate property could be one of the following types:

number - a rotation in clockwise radians. Full circle 360° is math.pi * 2 radians, 90° is pi / 2, 45° is pi / 4, etc.
Rotate - allows to specify rotation angle as well as alignment - the location of rotation center.

Example

For example:

ft.Image(
    src="https://picsum.photos/100/100",
    width=100,
    height=100,
    border_radius=5,
    rotate=Rotate(angle=0.25 * pi, alignment=ft.Alignment.CENTER_LEFT)
)

rtl #

rtl: bool = False

Whether the text direction of the control should be right-to-left (RTL).

scale #

scale: ScaleValue | None = None

Scales this control along the 2D plane. Default scale factor is 1.0, meaning no-scale.

Setting this property to 0.5, for example, makes this control twice smaller, while 2.0 makes it twice larger.

Different scale multipliers can be specified for x and y axis, by setting Control.scale property to an instance of Scale class. Either scale or scale_x and scale_y could be specified, but not all of them.

Example

ft.Image(
    src="https://picsum.photos/100/100",
    width=100,
    height=100,
    border_radius=5,
    scale=ft.Scale(scale_x=2, scale_y=0.5)
)

segments #

segments: list[Segment]

The segments of this button.

selected #

selected: list[str] = field(default_factory=list)

A set of Segment.values that indicate which segments are selected. It is updated when the user (un)selects a segment.

selected_icon #

selected_icon: Control | None = None

An Icon control that is used to indicate a segment is selected.

If show_selected_icon is True then for selected segments this icon will be shown before the Segment.label, replacing the Segment.icon if it is specified.

Defaults to an Icon with the CHECK icon.

show_selected_icon #

show_selected_icon: bool = True

A boolean value that indicates if the selected_icon is displayed on the selected segments.

If True, the selected_icon will be displayed at the start of the selected segments.

If False, then the selected_icon is not used and will not be displayed on selected segments.

style #

style: ButtonStyle | None = None

Customizes this button's appearance.

tooltip #

tooltip: TooltipValue | None = None

The tooltip ot show when this control is hovered over.

top #

top: Number | None = None

The distance that the child's top edge is inset from the top of the stack.

Note

Effective only if this control is a descendant of one of the following: Stack control, Page.overlay list.

visible #

visible: bool = True

Every control has visible property which is True by default - control is rendered on the page. Setting visible to False completely prevents control (and all its children if any) from rendering on a page canvas. Hidden controls cannot be focused or selected with a keyboard or mouse and they do not emit any events.

width #

width: Number | None = None

Imposed Control width in virtual pixels.

before_event #

before_event(e: ControlEvent)

before_update #

before_update()

clean #

clean() -> None

did_mount #

did_mount()

init #

init()

is_isolated #

is_isolated()

update #

update() -> None

will_unmount #

will_unmount()

Segment #

Bases: Control

A segment for a SegmentedButton.

RAISES	DESCRIPTION
`AssertionError`	If neither `icon` nor `label` is set.

badge #

badge: BadgeValue | None = None

A badge to show on top of this control.

col #

col: ResponsiveNumber = 12

If a parent of this control is a ResponsiveRow, this property is used to determine how many virtual columns of a screen this control will span.

Can be a number or a dictionary configured to have a different value for specific breakpoints, for example col={"sm": 6}.

This control spans the 12 virtual columns by default.

Dimensions

Breakpoint	Dimension
xs	<576px
sm	≥576px
md	≥768px
lg	≥992px
xl	≥1200px
xxl	≥1400px

data #

data: Any = skip_field()

Arbitrary data of any type.

disabled #

disabled: bool = False

Every control has disabled property which is False by default - control and all its children are enabled.

Note

The value of this property will be propagated down to all children controls recursively.

Example

For example, if you have a form with multiple entry controls you can disable them all together by disabling container:

ft.Column(
    disabled = True,
    controls=[
        ft.TextField(),
        ft.TextField()
    ]
)

expand #

expand: bool | int | None = None

Specifies whether/how this control should expand to fill available space in its parent layout.

More information here.

Note

Has effect only if the direct parent of this control is one of the following controls, or their subclasses: Column, Row, View, Page.

expand_loose #

expand_loose: bool = False

Allows the control to expand along the main axis if space is available, but does not require it to fill all available space.

More information here.

Note

If expand_loose is True, it will have effect only if:

expand is not None and
the direct parent of this control is one of the following controls, or their subclasses: Column, Row, View, Page.

icon #

icon: IconValueOrControl | None = None

The icon (typically an Icon) to be displayed in the segment.

key #

key: (
    str | int | float | bool | ValueKey | ScrollKey | None
) = None

label #

label: StrOrControl | None = None

The label (usually a Text) to be displayed in the segment.

opacity #

opacity: Number = 1.0

Defines the transparency of the control.

Value ranges from 0.0 (completely transparent) to 1.0 (completely opaque without any transparency).

page #

page: Page | PageView | None

The page (of type Page or PageView) to which this control belongs to.

parent #

parent: BaseControl | None

The direct ancestor(parent) of this control.

It defaults to None and will only have a value when this control is mounted (added to the page tree).

The Page control (which is the root of the tree) is an exception - it always has parent=None.

rtl #

rtl: bool = False

Whether the text direction of the control should be right-to-left (RTL).

tooltip #

tooltip: TooltipValue | None = None

The tooltip ot show when this control is hovered over.

value #

value: str

Used to identify the Segment.

visible #

visible: bool = True

Every control has visible property which is True by default - control is rendered on the page. Setting visible to False completely prevents control (and all its children if any) from rendering on a page canvas. Hidden controls cannot be focused or selected with a keyboard or mouse and they do not emit any events.

before_event #

before_event(e: ControlEvent)

before_update #

before_update()

clean #

clean() -> None

did_mount #

did_mount()

init #

init()

is_isolated #

is_isolated()

update #

update() -> None

will_unmount #

will_unmount()