Future Builder

The Future Builder widget is used to build a widget based on the result of a Future (an asynchronous operation). This is essential for handling data from APIs or other long-running tasks, allowing you to display different widgets for loading, error, and success states.

Properties

Property	Description
Initial Data	The initial data to use while the future is resolving.
AsyncController	An expression to control the future's execution.
Type	The type of future to execute (API or Delay).
Duration (ms)	If the Type is Delay, this is the duration of the delay in milliseconds.
Data Source	If the Type is API, this defines the API endpoint to call.

Actions

Property	Description
On Success	An action to trigger when the future completes successfully.
On Error	An action to trigger if the future completes with an error.

Child of Future Builder

Slot	Description
child	The widget to build based on the state of the future. This child widget will have access to variables like futureState (loading, error, completed) and response.

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Best Practices

• Use the initialData property to provide a good user experience while the future is resolving.

• Use a ConditionalBuilder as the child of the FutureBuilder to display different UI for different stream states (e.g., loading, error, data).