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FloatingActionButton

Examples#

Live example

Handling clicks#

import flet as ft


def main(page: ft.Page):
    page.title = "Floating Action Button"
    page.theme_mode = ft.ThemeMode.LIGHT
    page.horizontal_alignment = ft.CrossAxisAlignment.CENTER
    page.padding = 0
    page.scroll = ft.ScrollMode.HIDDEN

    # keeps track of the number of tiles already added
    count = 1

    def handle_fab_click(e: ft.Event[ft.FloatingActionButton]):
        nonlocal count  # to modify the count variable found in the outer scope
        page.add(
            ft.ListTile(
                title=ft.Text(f"Tile {count}"),
                bgcolor=ft.Colors.TEAL_300,
                leading=ft.Icon(
                    ft.Icons.CIRCLE_OUTLINED, color=ft.Colors.DEEP_ORANGE_300
                ),
                on_click=lambda x: print(x.control.title.value + " was clicked!"),
            )
        )
        page.show_dialog(ft.SnackBar(ft.Text("Tile was added successfully!")))
        count += 1

    page.floating_action_button = ft.FloatingActionButton(
        icon=ft.Icons.ADD,
        on_click=handle_fab_click,
        bgcolor=ft.Colors.LIME_300,
    )

    page.add(
        ft.Container(
            bgcolor=ft.Colors.BLUE,
            padding=ft.Padding.all(20),
            content=ft.Row(
                alignment=ft.MainAxisAlignment.CENTER,
                controls=[
                    ft.Text(
                        value="Floating Action Button Example",
                        style=ft.TextStyle(size=20, weight=ft.FontWeight.W_500),
                    )
                ],
            ),
        ),
        ft.Text("Press the FAB to add a tile!"),
    )


ft.run(main)

handling-clicks

FloatingActionButton #

Bases: LayoutControl

A floating action button is a circular icon button that hovers over content to promote a primary action in the application. Floating action button is usually set to page.floating_action_button, but can also be added as a regular control at any place on a page.

RAISES DESCRIPTION
AssertionError

If neither icon nor a valid content (string or visible Control) is provided.
AssertionError

If elevation, disabled_elevation, focus_elevation, highlight_elevation, or hover_elevation is negative.

align #

align: Alignment | None = None

Alignment of the control within its parent.

animate_align #

animate_align: AnimationValue | None = None

Enables implicit animation of the [align][flet.LayoutControl.] property.

More information here.

animate_margin #

animate_margin: AnimationValue | None = None

Enables implicit animation of the [margin][flet.LayoutControl.] property.

More information here.

animate_offset #

animate_offset: AnimationValue | None = None

Enables implicit animation of the [offset][flet.LayoutControl.] property.

More information here.

animate_opacity #

animate_opacity: AnimationValue | None = None

Enables implicit animation of the [opacity][flet.LayoutControl.] property.

More information here.

animate_position #

animate_position: AnimationValue | None = None

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

More information here.

animate_rotation #

animate_rotation: AnimationValue | None = None

Enables implicit animation of the [rotate][flet.LayoutControl.] property.

More information here.

animate_scale #

animate_scale: AnimationValue | None = None

Enables implicit animation of the [scale][flet.LayoutControl.] property.

More information here.

animate_size #

animate_size: AnimationValue | None = None

TBD

aspect_ratio #

aspect_ratio: Number | None = None

The aspect ratio of the control. It is defined as the ratio of the width to the height.

autofocus #

autofocus: bool = False

True if the control will be selected as the initial focus. If there is more than one control on a page with autofocus set, then the first one added to the page will get focus.

badge #

badge: BadgeValue | None = None

A badge to show on top of this control.

bgcolor #

bgcolor: ColorValue | None = None

Button background color.

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][flet.] control, [Page.overlay][flet.] list.

clip_behavior #

clip_behavior: ClipBehavior = NONE

Defines how the content is clipped.

col #

col: ResponsiveNumber = 12

If a parent of this control is a [ResponsiveRow][flet.], 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

content #

content: StrOrControl | None = None

The content of this button.

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()
    ]
)

disabled_elevation #

disabled_elevation: Number | None = None

The elevation of this button when disabled.

Defaults to the same value as elevation.

elevation #

elevation: Number | None = None

The elevation of this button.

Defaults to 6.

enable_feedback #

enable_feedback: bool | None = None

Whether detected gestures should provide acoustic and/or haptic feedback. On Android, for example, setting this to True will produce a click sound and a long-press will produce a short vibration.

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][flet.], [Row][flet.], [View][flet.], [Page][flet.].

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][flet.], [Row][flet.], [View][flet.], [Page][flet.].

focus_color #

focus_color: ColorValue | None = None

The color to use for filling this button when it has input focus.

focus_elevation #

focus_elevation: Number | None = None

The elevation of this button when it has input focus.

Defaults to 8.

foreground_color #

foreground_color: ColorValue | None = None

The default foreground color for icons and text within this button.

height #

height: Number | None = None

Imposed Control height in virtual pixels.

highlight_elevation #

highlight_elevation: Number | None = None

The elevation of this button when it is highlighted.

Defaults to 12.

hover_color #

hover_color: ColorValue | None = None

The color to use for filling this button when hovered.

hover_elevation #

hover_elevation: Number | None = None

The elevation of this button it is enabled and being hovered over.

Defaults to 8.

icon #

icon: IconDataOrControl | None = None

Icon shown in this button.

key #

key: KeyValue | 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][flet.] control, [Page.overlay][flet.] list.

margin #

margin: MarginValue | None = None

Sets the margin of the control.

mini #

mini: bool = False

Controls the size of this button.

By default, floating action buttons are non-mini and have a height and width of 56.0 logical pixels. Mini floating action buttons have a height and width of 40.0 logical pixels with a layout width and height of 48.0 logical pixels.

mouse_cursor #

mouse_cursor: MouseCursor | None = None

The cursor to be displayed when a mouse pointer enters or is hovering over this control.

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[LayoutControl] | 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_click #

on_click: (
    ControlEventHandler[FloatingActionButton] | None
) = None

Called when a user clicks this button.

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 | BasePage | None

The page 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][flet.] control, [Page.overlay][flet.] 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)
)

shape #

shape: OutlinedBorder | None = None

The shape of the FAB's border.

splash_color #

splash_color: ColorValue | None = None

The color to use for the ink splash.

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][flet.] control, [Page.overlay][flet.] list.

url #

url: str | Url | None = None

The URL to open when this button is clicked.

Additionally, if on_click event callback is provided, it is fired after that.

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()

build #

build()

Called once during control initialization to define its child controls. self.page is available in this method.

clean #

clean() -> None

did_mount #

did_mount()

init #

init()

is_isolated #

is_isolated()

update #

update() -> None

will_unmount #

will_unmount()