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Some more documentation around WidgetBuilder and close friends. (#24731)

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Ian Hickson 2018-11-27 11:28:31 -08:00 committed by GitHub
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1 changed files with 23 additions and 1 deletions
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24
packages/flutter/lib/src/widgets/framework.dart
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@ -3633,12 +3633,23 @@ class ErrorWidget extends LeafRenderObjectWidget {
/// or [State.build].
///
/// Used by [Builder.builder], [OverlayEntry.builder], etc.
///
/// See also:
///
/// * [IndexedWidgetBuilder], which is similar but also takes an index.
/// * [TransitionBuilder], which is similar but also takes a child.
/// * [ValueWidgetBuilder], which is similar but takes a value and a child.
typedef WidgetBuilder = Widget Function(BuildContext context);
/// Signature for a function that creates a widget for a given index, e.g., in a
/// list.
///
/// Used by [ListView.builder] and other APIs that use lazily-generated widgets.
///
/// See also:
///
/// * [WidgetBuilder], which is similar but only takes a [BuildContext].
/// * [TransitionBuilder], which is similar but also takes a child.
typedef IndexedWidgetBuilder = Widget Function(BuildContext context, int index);
/// A builder that builds a widget given a child.
@ -3647,11 +3658,22 @@ typedef IndexedWidgetBuilder = Widget Function(BuildContext context, int index);
///
/// Used by [AnimatedBuilder.builder], as well as [WidgetsApp.builder] and
/// [MaterialApp.builder].
///
/// See also:
///
/// * [WidgetBuilder], which is similar but only takes a [BuildContext].
/// * [IndexedWidgetBuilder], which is similar but also takes an index.
/// * [ValueWidgetBuilder], which is similar but takes a value and a child.
typedef TransitionBuilder = Widget Function(BuildContext context, Widget child);
/// A Signiture for a function that creates a widget given [onStepContinue] and [onStepCancel].
/// A builder that creates a widget given the two callbacks `onStepContinue` and
/// `onStepCancel`.
///
/// Used by [Stepper.builder].
///
/// See also:
///
/// * [WidgetBuilder], which is similar but only takes a [BuildContext].
typedef ControlsWidgetBuilder = Widget Function(BuildContext context, {VoidCallback onStepContinue, VoidCallback onStepCancel});
/// An [Element] that composes other [Element]s.