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Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>
This commit is contained in:
bggRGjQaUbCoE
2025-05-26 21:05:04 +08:00
parent 83de915e54
commit dbcc19cac1
4 changed files with 28 additions and 91 deletions
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75
lib/common/widgets/draggable_scrollable_sheet.dart
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@@ -404,81 +404,6 @@ class DraggableScrollableSheet extends StatefulWidget {
_DraggableScrollableSheetState();
}
/// A [Notification] related to the extent, which is the size, and scroll
/// offset, which is the position of the child list, of the
/// [DraggableScrollableSheet].
///
/// [DraggableScrollableSheet] widgets notify their ancestors when the size of
/// the sheet changes. When the extent of the sheet changes via a drag,
/// this notification bubbles up through the tree, which means a given
/// [NotificationListener] will receive notifications for all descendant
/// [DraggableScrollableSheet] widgets. To focus on notifications from the
/// nearest [DraggableScrollableSheet] descendant, check that the [depth]
/// property of the notification is zero.
///
/// When an extent notification is received by a [NotificationListener], the
/// listener will already have completed build and layout, and it is therefore
/// too late for that widget to call [State.setState]. Any attempt to adjust the
/// build or layout based on an extent notification would result in a layout
/// that lagged one frame behind, which is a poor user experience. Extent
/// notifications are used primarily to drive animations. The [Scaffold] widget
/// listens for extent notifications and responds by driving animations for the
/// [FloatingActionButton] as the bottom sheet scrolls up.
class DraggableScrollableNotification extends Notification
with ViewportNotificationMixin {
/// Creates a notification that the extent of a [DraggableScrollableSheet] has
/// changed.
///
/// All parameters are required. The [minExtent] must be >= 0. The [maxExtent]
/// must be <= 1.0. The [extent] must be between [minExtent] and [maxExtent].
DraggableScrollableNotification({
required this.extent,
required this.minExtent,
required this.maxExtent,
required this.initialExtent,
required this.context,
this.shouldCloseOnMinExtent = true,
}) : assert(0.0 <= minExtent),
assert(maxExtent <= 1.0),
assert(minExtent <= extent),
assert(minExtent <= initialExtent),
assert(extent <= maxExtent),
assert(initialExtent <= maxExtent);
/// The current value of the extent, between [minExtent] and [maxExtent].
final double extent;
/// The minimum value of [extent], which is >= 0.
final double minExtent;
/// The maximum value of [extent].
final double maxExtent;
/// The initially requested value for [extent].
final double initialExtent;
/// The build context of the widget that fired this notification.
///
/// This can be used to find the sheet's render objects to determine the size
/// of the viewport, for instance. A listener can only assume this context
/// is live when it first gets the notification.
final BuildContext context;
/// Whether the widget that fired this notification, when dragged (or flung)
/// to minExtent, should cause its parent sheet to close.
///
/// It is up to parent classes to properly read and handle this value.
final bool shouldCloseOnMinExtent;
@override
void debugFillDescription(List<String> description) {
super.debugFillDescription(description);
description.add(
'minExtent: $minExtent, extent: $extent, maxExtent: $maxExtent, initialExtent: $initialExtent',
);
}
}
/// Manages state between [_DraggableScrollableSheetState],
/// [_DraggableScrollableSheetScrollController], and
/// [_DraggableScrollableSheetScrollPosition].