BaseControl

Base class for all Flet controls and services.

Properties

• data(Any) –

  Arbitrary data of any type.

• key(KeyValue | None) –
• page(Page | BasePage) –

  The page to which this control belongs to.

• parent(BaseControl | None) –

  The direct ancestor(parent) of this control.

Methods

• before_event –

  Intercept an event before its handler is executed.

• is_isolated –

  Return whether this control is marked as isolated.

• update –

  Request a UI update for this control.

Properties

data class-attribute instance-attribute

data: Any = skip_field()

Arbitrary data of any type.

key class-attribute instance-attribute

key: KeyValue | None = None

page property

page: Page | BasePage

The page to which this control belongs to.

parent property

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.

Methods

before_event

before_event(e: ControlEvent)

Intercept an event before its handler is executed.

Return False to cancel dispatch. Return True or None to continue normal event processing.

is_isolated

is_isolated()

Return whether this control is marked as isolated.

Isolated controls are excluded from parent-driven update traversal and are expected to manage their own update boundaries.

update

update() -> None

Request a UI update for this control.

Call after changing control state or properties. The control must be attached to a page and not marked as frozen.