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Reference SizeChangedLayoutNotifier from SizeChangedLayoutNotification (#8887)

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Fixes #7520
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Adam Barth 2017-03-20 14:50:02 -07:00 committed by GitHub
parent d1f73fd0ad
commit 1c69fa7eac
1 changed files with 16 additions and 2 deletions
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18
packages/flutter/lib/src/widgets/size_changed_layout_notifier.dart
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@ -9,12 +9,26 @@ import 'package:flutter/widgets.dart';
/// this notification has changed, and that therefore any assumptions about that
/// layout are no longer valid.
///
/// For example, sent by [SizeChangedLayoutNotifier] whenever
/// [SizeChangedLayoutNotifier] changes size.
///
/// This notification for triggering repaints, but if you use this notification
/// to trigger rebuilds or relayouts, you'll create a backwards dependency in
/// the frame pipeline because [SizeChangedLayoutNotification]s are generated
/// during layout, which is after the build phase and in the middle of the
/// layout phase. This backwards dependency can lead to visual corruption or
/// lags.
///
/// See [LayoutChangedNotification] for additional discussion of layout
/// notifications such as this one.
///
/// See also:
///
/// * [SizeChangedLayoutNotifier], which sends this notification.
class SizeChangedLayoutNotification extends LayoutChangedNotification { }
/// A widget that automatically dispatches a [SizeChangedLayoutNotifier] when
/// the layout of its child changes.
/// A widget that automatically dispatches a [SizeChangedLayoutNotification]
/// when the layout of its child changes.
///
/// Useful especially when having some complex, layout-changing animation within
/// [Material] that is also interactive.