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Container

Allows to decorate a control with background color and border and position it with padding, margin and alignment.

Container
Container explained

Inherits: LayoutControl, AdaptiveControl, ActionControl

Properties

  • alignment - Defines the alignment of the content inside this container.
  • animate - Enables container "implicit" animation that gradually changes its values over a period of time.
  • bgcolor - Defines the background color of this container.
  • blend_mode - The blend mode applied to the color or gradient background of the container.
  • blur - Defines how Gaussian blur effect should be applied under this container.
  • border - A border to draw above the background color.
  • border_radius - The border radius of this container.
  • clip_behavior - Defines how the content of this container is clipped.
  • color_filter - Applies a color filter to this container.
  • content - The content of this container.
  • dark_theme - Allows setting a nested theme to be used when in dark theme mode for all controls inside the container and down its tree.
  • foreground_decoration - The foreground decoration of this container.
  • gradient - Defines the gradient background of this container.
  • ignore_interactions - Whether to ignore all interactions with this container and its descendants.
  • image - An image to paint above the bgcolor or gradient.
  • ink - True to produce ink ripples effect when user clicks this container.
  • ink_color - The splash color of the ink response.
  • padding - Empty space to inscribe inside a container decoration (background, border).
  • shadow - The shadow(s) below this container.
  • shape - Sets the shape of this container.
  • theme - Allows setting a nested theme for all controls inside this container and down its tree.
  • theme_mode - "Resets" parent theme and creates a new, unique scheme for all controls inside the container.
  • url - The URL to open when this container is clicked.

Events

  • on_click - Called when a user clicks the container.
  • on_hover - Called when a mouse pointer enters or exists the container area.
  • on_long_press - Called when this container is long-pressed.
  • on_tap_down - Called when a user clicks the container with or without a long press.

Examples​

Clickable​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    page.title = "Container Example"
    page.theme_mode = ft.ThemeMode.LIGHT
    page.vertical_alignment = ft.MainAxisAlignment.CENTER
    page.horizontal_alignment = ft.CrossAxisAlignment.CENTER

    page.add(
        ft.SafeArea(
            content=ft.Row(
                alignment=ft.MainAxisAlignment.CENTER,
                controls=[
                    ft.Container(
                        margin=10,
                        padding=10,
                        alignment=ft.Alignment.CENTER,
                        bgcolor=ft.Colors.AMBER,
                        width=150,
                        height=150,
                        border_radius=10,
                        content=ft.Text("Non clickable"),
                    ),
                    ft.Container(
                        margin=10,
                        padding=10,
                        alignment=ft.Alignment.CENTER,
                        bgcolor=ft.Colors.GREEN_200,
                        width=150,
                        height=150,
                        border_radius=10,
                        on_click=lambda e: print("Clickable without Ink clicked!"),
                        content=ft.Text("Clickable without Ink"),
                    ),
                    ft.Container(
                        margin=10,
                        padding=10,
                        alignment=ft.Alignment.CENTER,
                        bgcolor=ft.Colors.CYAN_200,
                        width=150,
                        height=150,
                        border_radius=10,
                        ink=True,
                        on_click=lambda e: print("Clickable with Ink clicked!"),
                        content=ft.Text("Clickable with Ink"),
                    ),
                    ft.Container(
                        margin=10,
                        padding=10,
                        alignment=ft.Alignment.CENTER,
                        width=150,
                        height=150,
                        border_radius=10,
                        ink=True,
                        on_click=lambda e: print(
                            "Clickable transparent with Ink clicked!"
                        ),
                        content=ft.Text("Clickable transparent with Ink"),
                    ),
                ],
            )
        ),
    )


if __name__ == "__main__":
    ft.run(main)

Handling clicks​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    page.theme_mode = ft.ThemeMode.LIGHT
    page.vertical_alignment = ft.MainAxisAlignment.CENTER
    page.horizontal_alignment = ft.CrossAxisAlignment.CENTER
    lp_counter = 0
    cl_counter = 0
    td_counter = 0

    def on_click(e):
        nonlocal cl_counter
        cl_counter += 1
        t1.spans[-1] = ft.TextSpan(
            text=f"  {cl_counter}  ",
            style=ft.TextStyle(size=16, bgcolor=ft.Colors.TEAL_300),
        )
        t1.update()

    def on_long_press(e):
        nonlocal lp_counter
        lp_counter += 1
        t3.spans[-1] = ft.TextSpan(
            text=f"  {lp_counter}  ",
            style=ft.TextStyle(size=16, bgcolor=ft.Colors.TEAL_300),
        )
        t3.update()

    def on_tap_down(e):
        nonlocal td_counter
        td_counter += 1
        t2.spans[-1] = ft.TextSpan(
            text=f"  {td_counter}  ",
            style=ft.TextStyle(size=16, bgcolor=ft.Colors.TEAL_300),
        )
        t2.update()

    c = ft.Container(
        bgcolor=ft.Colors.PINK_900,
        alignment=ft.Alignment.CENTER,
        padding=ft.Padding.all(10),
        height=150,
        width=150,
        on_click=on_click,
        on_long_press=on_long_press,
        on_tap_down=on_tap_down,
        content=ft.Text(
            "Press Me!",
            text_align=ft.TextAlign.CENTER,
            style=ft.TextStyle(
                size=30,
                # weight=ft.FontWeight.BOLD,
                foreground=ft.Paint(
                    color=ft.Colors.BLUE_700,
                    stroke_cap=ft.StrokeCap.BUTT,
                    stroke_width=2,
                    stroke_join=ft.StrokeJoin.BEVEL,
                    style=ft.PaintingStyle.STROKE,
                ),
            ),
            theme_style=ft.TextThemeStyle.DISPLAY_MEDIUM,
        ),
    )
    t1 = ft.Text(
        spans=[
            ft.TextSpan(
                text="On Click", style=ft.TextStyle(size=16, weight=ft.FontWeight.BOLD)
            ),
            ft.TextSpan(text=" counter:  ", style=ft.TextStyle(size=16, italic=True)),
            ft.TextSpan(
                text=f"  {cl_counter}  ",
                style=ft.TextStyle(size=16, bgcolor=ft.Colors.TEAL_300),
            ),
        ]
    )
    t2 = ft.Text(
        spans=[
            ft.TextSpan(
                text="Tap Down", style=ft.TextStyle(size=16, weight=ft.FontWeight.BOLD)
            ),
            ft.TextSpan(text=" counter:  ", style=ft.TextStyle(size=16, italic=True)),
            ft.TextSpan(
                text=f"  {td_counter}  ",
                style=ft.TextStyle(size=16, bgcolor=ft.Colors.TEAL_300),
            ),
        ]
    )
    t3 = ft.Text(
        spans=[
            ft.TextSpan(
                text="Long Press",
                style=ft.TextStyle(size=16, weight=ft.FontWeight.BOLD),
            ),
            ft.TextSpan(text=" counter:  ", style=ft.TextStyle(size=16, italic=True)),
            ft.TextSpan(
                text=f"  {lp_counter}  ",
                style=ft.TextStyle(size=16, bgcolor=ft.Colors.TEAL_300),
            ),
        ]
    )

    page.add(ft.SafeArea(content=ft.Column(controls=[c, t1, t3, t2])))


if __name__ == "__main__":
    ft.run(main)

Handling hovers​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    def handle_hover(e: ft.Event[ft.Container]):
        e.control.bgcolor = ft.Colors.BLUE if e.data else ft.Colors.RED
        e.control.update()

    page.add(
        ft.SafeArea(
            content=ft.Container(
                width=200,
                height=200,
                bgcolor=ft.Colors.RED,
                ink=False,
                on_hover=handle_hover,
            )
        )
    )


if __name__ == "__main__":
    ft.run(main)

Animate size and color​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    def animate_container(e: ft.Event[ft.Button]):
        container.width = 100 if container.width == 150 else 150
        container.height = 50 if container.height == 150 else 150
        container.bgcolor = (
            ft.Colors.BLUE if container.bgcolor == ft.Colors.RED else ft.Colors.RED
        )
        container.update()

    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    container := ft.Container(
                        width=150,
                        height=150,
                        bgcolor=ft.Colors.RED,
                        animate=ft.Animation(
                            duration=1000, curve=ft.AnimationCurve.BOUNCE_OUT
                        ),
                    ),
                    ft.Button("Animate container", on_click=animate_container),
                ]
            )
        ),
    )


if __name__ == "__main__":
    ft.run(main)

Animate gradient and shape​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    gradient1 = ft.LinearGradient(
        begin=ft.Alignment.TOP_CENTER,
        end=ft.Alignment.BOTTOM_CENTER,
        colors=[ft.Colors.GREEN, ft.Colors.BLUE],
        stops=[0.5, 1.0],
    )
    gradient2 = ft.RadialGradient(
        center=ft.Alignment.TOP_LEFT,
        radius=1.0,
        colors=[ft.Colors.YELLOW, ft.Colors.DEEP_ORANGE_900],
        tile_mode=ft.GradientTileMode.CLAMP,
    )

    message = ft.Text("Animate me!")

    def animate_container(e: ft.Event[ft.Button]):
        message.value = (
            "Animate me back!" if message.value == "Animate me!" else "Animate me!"
        )
        container.width = 150 if container.width == 250 else 250
        container.height = 150 if container.height == 250 else 250
        container.gradient = gradient2 if container.gradient == gradient1 else gradient1
        if container.alignment == ft.Alignment.TOP_LEFT:
            container.alignment = ft.Alignment.BOTTOM_RIGHT
        else:
            container.alignment = ft.Alignment.TOP_LEFT
        container.border_radius = 30 if container.border_radius == 10 else 10
        container.border = (
            ft.Border.all(width=2, color=ft.Colors.BLACK)
            if container.border == ft.Border.all(width=2, color=ft.Colors.BLUE)
            else ft.Border.all(width=2, color=ft.Colors.BLUE)
        )
        container.update()

    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    container := ft.Container(
                        width=250,
                        height=250,
                        gradient=gradient2,
                        alignment=ft.Alignment.TOP_LEFT,
                        animate=ft.Animation(
                            duration=1000, curve=ft.AnimationCurve.BOUNCE_OUT
                        ),
                        border=ft.Border.all(width=2, color=ft.Colors.BLUE),
                        border_radius=10,
                        padding=10,
                        content=message,
                    ),
                    ft.Button("Animate container", on_click=animate_container),
                ]
            )
        ),
    )


if __name__ == "__main__":
    ft.run(main)

Animated slide-in menu​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    def show_menu(e: ft.Event[ft.Button]):
        container.offset = ft.Offset(0, 0)
        container.update()

    def hide_menu(e: ft.Event[ft.IconButton]):
        container.offset = ft.Offset(-2, 0)
        container.update()

    page.overlay.append(
        container := ft.Container(
            left=10,
            top=10,
            width=200,
            height=300,
            bgcolor=ft.Colors.SURFACE_CONTAINER_HIGHEST,
            border_radius=5,
            offset=ft.Offset(-2, 0),
            animate_offset=ft.Animation(300, ft.AnimationCurve.EASE_IN),
            content=ft.Column(
                controls=[
                    ft.Row(
                        alignment=ft.MainAxisAlignment.END,
                        controls=[
                            ft.IconButton(icon=ft.Icons.CLOSE, on_click=hide_menu)
                        ],
                    ),
                    ft.ListTile(
                        title=ft.Text("Menu A"),
                        on_click=lambda _: print("Menu A clicked"),
                    ),
                    ft.ListTile(
                        title=ft.Text("Menu B"),
                        on_click=lambda _: print("Menu B clicked"),
                    ),
                ]
            ),
        )
    )

    page.add(ft.SafeArea(content=ft.Button("Show menu", on_click=show_menu)))


if __name__ == "__main__":
    ft.run(main)

Inherited and overridden theme​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    # Yellow page theme with SYSTEM (default) mode
    page.theme = ft.Theme(
        color_scheme_seed=ft.Colors.YELLOW,
    )

    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    # Page theme
                    ft.Container(
                        bgcolor=ft.Colors.SURFACE_TINT,
                        padding=20,
                        width=300,
                        content=ft.Button("Page theme button"),
                    ),
                    # Inherited theme with primary color overridden
                    ft.Container(
                        theme=ft.Theme(
                            color_scheme=ft.ColorScheme(primary=ft.Colors.PINK)
                        ),
                        bgcolor=ft.Colors.SURFACE_TINT,
                        padding=20,
                        width=300,
                        content=ft.Button("Inherited theme button"),
                    ),
                    # Unique always DARK theme
                    ft.Container(
                        theme=ft.Theme(color_scheme_seed=ft.Colors.INDIGO),
                        theme_mode=ft.ThemeMode.DARK,
                        bgcolor=ft.Colors.SURFACE_TINT,
                        padding=20,
                        width=300,
                        content=ft.Button("Unique theme button"),
                    ),
                ]
            )
        ),
    )


if __name__ == "__main__":
    ft.run(main)

Page, dark and light themes​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    # page.theme = ft.Theme(
    #     color_scheme_seed=ft.Colors.YELLOW,
    #     color_scheme=ft.ColorScheme(
    #         primary=ft.Colors.GREEN, primary_container=ft.Colors.GREEN_200
    #     ),
    # )

    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    ft.Row(
                        controls=[
                            ft.Button("Page theme"),
                            ft.TextButton("Page theme text button"),
                            ft.Text(
                                "Text in primary container color",
                                color=ft.Colors.PRIMARY_CONTAINER,
                            ),
                        ]
                    ),
                    ft.Container(
                        height=100,
                        theme=ft.Theme(
                            color_scheme=ft.ColorScheme(primary=ft.Colors.PINK)
                        ),
                        content=ft.Row(
                            controls=[
                                ft.Button(
                                    "Inherited theme with primary color overridden"
                                ),
                                ft.TextButton("Button 2"),
                            ]
                        ),
                    ),
                    ft.Container(
                        padding=20,
                        bgcolor=ft.Colors.SURFACE_TINT,
                        theme_mode=ft.ThemeMode.DARK,
                        theme=ft.Theme(
                            color_scheme_seed=ft.Colors.GREEN,
                            color_scheme=ft.ColorScheme(
                                primary_container=ft.Colors.BLUE
                            ),
                        ),
                        content=ft.Row(
                            controls=[
                                ft.Button("Always DARK theme"),
                                ft.TextButton("Text button"),
                                ft.Text(
                                    "Text in primary container color",
                                    color=ft.Colors.PRIMARY_CONTAINER,
                                ),
                            ]
                        ),
                    ),
                    ft.Container(
                        padding=20,
                        bgcolor=ft.Colors.SURFACE_TINT,
                        border=ft.Border.all(3, ft.Colors.OUTLINE),
                        theme_mode=ft.ThemeMode.LIGHT,
                        theme=ft.Theme(),
                        content=ft.Row(
                            controls=[
                                ft.Button("Always LIGHT theme"),
                                ft.TextButton("Text button"),
                                ft.Text(
                                    "Text in primary container color",
                                    color=ft.Colors.PRIMARY_CONTAINER,
                                ),
                            ]
                        ),
                    ),
                ]
            )
        )
    )


if __name__ == "__main__":
    ft.run(main)

Theme mode toggle​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    page.theme_mode = ft.ThemeMode.DARK

    def handle_switch_change(e: ft.Event[ft.Switch]):
        if page.theme_mode == ft.ThemeMode.DARK:
            page.theme_mode = ft.ThemeMode.LIGHT
            switch.thumb_icon = ft.Icons.LIGHT_MODE
        else:
            switch.thumb_icon = ft.Icons.DARK_MODE
            page.theme_mode = ft.ThemeMode.DARK
        page.update()

    # Yellow page theme with SYSTEM (default) mode
    page.theme = ft.Theme(color_scheme_seed=ft.Colors.YELLOW)

    switch = ft.Switch(thumb_icon=ft.Icons.DARK_MODE, on_change=handle_switch_change)

    page.add(
        ft.SafeArea(
            content=ft.Column(
                controls=[
                    # Page theme
                    ft.Row(
                        alignment=ft.MainAxisAlignment.SPACE_BETWEEN,
                        controls=[
                            ft.Container(
                                bgcolor=ft.Colors.SURFACE_TINT,
                                padding=20,
                                width=300,
                                content=ft.Button("Page theme button"),
                            ),
                            ft.Container(
                                padding=ft.Padding.only(bottom=50),
                                alignment=ft.Alignment.TOP_RIGHT,
                                content=switch,
                            ),
                        ],
                    ),
                    # Inherited theme with primary color overridden
                    ft.Container(
                        theme=ft.Theme(
                            color_scheme=ft.ColorScheme(primary=ft.Colors.PINK)
                        ),
                        bgcolor=ft.Colors.SURFACE_TINT,
                        padding=20,
                        width=300,
                        content=ft.Button("Inherited theme button"),
                    ),
                    # Unique always DARK theme
                    ft.Container(
                        theme=ft.Theme(color_scheme_seed=ft.Colors.INDIGO),
                        theme_mode=ft.ThemeMode.DARK,
                        bgcolor=ft.Colors.SURFACE_TINT,
                        padding=20,
                        width=300,
                        content=ft.Button("Unique theme button"),
                    ),
                ]
            )
        ),
    )


if __name__ == "__main__":
    ft.run(main)

Size aware​

play_arrowTry Online
import flet as ft


def main(page: ft.Page):
    def handle_size_change(e: ft.LayoutSizeChangeEvent[ft.Container]):
        e.control.content.value = f"{int(e.width)} x {int(e.height)}"

    page.add(
        ft.SafeArea(
            expand=True,
            content=ft.Container(
                expand=True,
                alignment=ft.Alignment.CENTER,
                bgcolor=ft.Colors.BLUE_ACCENT,
                size_change_interval=100,
                on_size_change=handle_size_change,
                content=ft.Text(color=ft.Colors.WHITE, weight=ft.FontWeight.BOLD),
            ),
        )
    )


if __name__ == "__main__":
    ft.run(main)

Properties​

alignmentclass-attributeinstance-attribute​

alignment: Alignment | None = None

Defines the alignment of the content inside this container.

Note

If alignment is non-None, this container may expand to fill the available space from its parent (before positioning its content within itself according to the given alignment) instead of shrinking to its content. If you need this container to keep a fixed size, give it container an explicit width and/or height values, or constrain it via its parent.

animateclass-attributeinstance-attribute​

animate: AnimationValue | None = None

Enables container "implicit" animation that gradually changes its values over a period of time.

bgcolorclass-attributeinstance-attribute​

bgcolor: ColorValue | None = None

Defines the background color of this container.

blend_modeclass-attributeinstance-attribute​

blend_mode: BlendMode | None = None

The blend mode applied to the color or gradient background of the container.

Defaults to BlendMode.MODULATE.

blurclass-attributeinstance-attribute​

blur: BlurValue | None = None

Defines how Gaussian blur effect should be applied under this container.

Example
ft.Stack(
    controls=[
        ft.Container(
            content=ft.Text("Hello"),
            image_src="https://picsum.photos/100/100",
            width=100,
            height=100,
        ),
        ft.Container(
            width=50,
            height=50,
            blur=10,
            bgcolor="#44CCCC00",
        ),
        ft.Container(
            width=50,
            height=50,
            left=10,
            top=60,
            blur=(0, 10),
        ),
        ft.Container(
            top=10,
            left=60,
            blur=ft.Blur(10, 0, ft.BlurTileMode.MIRROR),
            width=50,
            height=50,
            bgcolor="#44CCCCCC",
            border=ft.Border.all(2, ft.Colors.BLACK),
        ),
    ]
)

borderclass-attributeinstance-attribute​

border: Border | None = None

A border to draw above the background color.

border_radiusclass-attributeinstance-attribute​

border_radius: BorderRadiusValue | None = None

The border radius of this container.

clip_behaviorclass-attributeinstance-attribute​

clip_behavior: ClipBehavior | None = None

Defines how the content of this container is clipped.

Defaults to ClipBehavior.ANTI_ALIAS if border_radius is not None; otherwise ClipBehavior.NONE.

color_filterclass-attributeinstance-attribute​

color_filter: ColorFilter | None = None

Applies a color filter to this container.

contentclass-attributeinstance-attribute​

content: Control | None = None

The content of this container.

dark_themeclass-attributeinstance-attribute​

dark_theme: Theme | None = None

Allows setting a nested theme to be used when in dark theme mode for all controls inside the container and down its tree.

foreground_decorationclass-attributeinstance-attribute​

foreground_decoration: BoxDecoration | None = None

The foreground decoration of this container.

gradientclass-attributeinstance-attribute​

gradient: Gradient | None = None

Defines the gradient background of this container.

ignore_interactionsclass-attributeinstance-attribute​

ignore_interactions: bool = False

Whether to ignore all interactions with this container and its descendants.

imageclass-attributeinstance-attribute​

image: DecorationImage | None = None

An image to paint above the bgcolor or gradient. If shape=BoxShape.CIRCLE then this image is clipped to the circle's boundary; if border_radius is not None then the image is clipped to the given radii.

inkclass-attributeinstance-attribute​

ink: bool = False

True to produce ink ripples effect when user clicks this container.

ink_colorclass-attributeinstance-attribute​

ink_color: ColorValue | None = None

The splash color of the ink response.

paddingclass-attributeinstance-attribute​

padding: PaddingValue | None = None

Empty space to inscribe inside a container decoration (background, border). The child control is placed inside this padding.

shadowclass-attributeinstance-attribute​

shadow: BoxShadowValue | None = None

The shadow(s) below this container.

shapeclass-attributeinstance-attribute​

shape: BoxShape = BoxShape.RECTANGLE

Sets the shape of this container.

themeclass-attributeinstance-attribute​

theme: Theme | None = None

Allows setting a nested theme for all controls inside this container and down its tree.

theme_modeclass-attributeinstance-attribute​

theme_mode: ThemeMode | None = None

"Resets" parent theme and creates a new, unique scheme for all controls inside the container. Otherwise the styles defined in container's theme property override corresponding styles from the parent, inherited theme.

Defaults to ThemeMode.SYSTEM.

urlclass-attributeinstance-attribute​

url: str | Url | None = None

The URL to open when this container is clicked.

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

Events​

on_clickclass-attributeinstance-attribute​

on_click: ControlEventHandler[Container] | None = None

Called when a user clicks the container.

It will not be called if this container is long pressed.

on_hoverclass-attributeinstance-attribute​

on_hover: ControlEventHandler[Container] | None = None

Called when a mouse pointer enters or exists the container area.

The Event.data property of the event handler argument is a boolean: True when the cursor enters and False when it exits this container.

on_long_pressclass-attributeinstance-attribute​

on_long_press: ControlEventHandler[Container] | None = None

Called when this container is long-pressed.

on_tap_downclass-attributeinstance-attribute​

on_tap_down: EventHandler[TapEvent[Container]] | None = None

Called when a user clicks the container with or without a long press.