AsyncPaginatedDropdownControl

How long to wait after the last typed character before the query goes out.

Validator responsible for validating this control. Every control type provides its own implementation (e.g. StringValidator). Empty implementation by default

Whether this control can hold value, i.e. whether it is a value of type T (and for a choice from fixed options - one of them). Checked for initial values and in updateControl. Controls without a value of their own accept nothing: a section, a button, and a repeatable list, which manages its rows itself. Containers check the shape of their initial data in setInitValue.

Children of this control in the current form state, each with a context in which this control is the parent: a section has one set, a repeatable - one per row. The engine walks down the tree through them when initializing, validating and collecting data.

Converts the control's internal state (ControlState) into a result to save (ControlResultData). Can be overridden for custom conversions (e.g. in RepeatableControl).

Makes a deep copy of the initial value for the current value. Matters for mutable types (e.g. List), so that changes to value do not affect initValue.

Renders the control's own UI. Every concrete control type (e.g. StringControl) implements it.

Renders this control's validation errors.

Runs the actions defined for this control, usually after a value change.

Returns the control's result (current and initial value) for further processing. If the control is invisible, its currentValue is set to null.

Sets the references to the form components. This is the second stage of a control's initialization, called by FormHandler. Gives access to the global state, the schema and the error manager. Also lets particular controls run additional initialization steps they need

Renders the loading indicator.

Subclasses implement this to provide the data of a given page. It is suspend because the loading is asynchronous.

Renders the main content of the menu.

Describes value as not fitting this control, for exception messages.

Renders the list of options to choose from.

Registers the children in the global map Holds references to the controls defined inside a control that has its own

Why the control does not accept value, or null when it does.

Renders the control in the user interface. This is the entry point for FormView. Handles visibility.

Subclasses implement this to render the content of the dropdown menu.

Works out the text of the selected value. Called once per value, outside the rendering path, and the result lands in ControlState.displayText - which is why querying the database or an API is fine here.

Renders the search field inside the menu.

Sets the control's initial value and creates its state (ControlState).

Runs this control's validation with its validator.