ReorderableSliverChildBuilderDelegate class
Reorderable (drag and drop) version of SliverChildBuilderDelegate, a delegate that supplies children for slivers using a builder callback.
The widget works exactly like SliverChildBuilderDelegate. When using ReorderableSliverList, replace SliverChildBuilderDelegate with this class.
See also:
- SliverChildBuilderDelegate, for how to use SliverChildBuilderDelegate.
- ReorderableSliverChildListDelegate, which is a delegate that supplies children for slivers using an explicit list.
- Inheritance
-
- Object
- SliverChildDelegate
- SliverChildBuilderDelegate
- ReorderableSliverChildBuilderDelegate
Constructors
- ReorderableSliverChildBuilderDelegate(IndexedWidgetBuilder builder, {int? childCount, bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, SemanticIndexCallback semanticIndexCallback = _kDefaultSemanticIndexCallback, int semanticIndexOffset = 0})
- Creates a delegate that supplies children for slivers using the given builder callback.
Properties
- addAutomaticKeepAlives → bool
-
Whether to wrap each child in an AutomaticKeepAlive.
finalinherited
- addRepaintBoundaries → bool
-
Whether to wrap each child in a RepaintBoundary.
finalinherited
- addSemanticIndexes → bool
-
Whether to wrap each child in an IndexedSemantics.
finalinherited
- builder → NullableIndexedWidgetBuilder
-
Called to build children for the sliver.
finalinherited
- childCount → int?
-
The total number of children this delegate can provide.
finalinherited
- estimatedChildCount → int?
-
Returns an estimate of the number of children this delegate will build.
no setterinherited
- findChildIndexCallback → ChildIndexGetter?
-
Called to find the new index of a child based on its key in case of reordering.
finalinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- semanticIndexCallback → SemanticIndexCallback
-
A SemanticIndexCallback which is used when addSemanticIndexes is true.
finalinherited
- semanticIndexOffset → int
-
An initial offset to add to the semantic indexes generated by this widget.
finalinherited
- wrap ← Function
-
no getterinherited
Methods
-
build(
BuildContext context, int index) → Widget? -
Returns the child with the given index.
override
-
debugFillDescription(
List< String> description) → void -
Add additional information to the given description for use by toString.
inherited
-
didFinishLayout(
int firstIndex, int lastIndex) → void -
Called at the end of layout to indicate that layout is now complete.
inherited
-
estimateMaxScrollOffset(
int firstIndex, int lastIndex, double leadingScrollOffset, double trailingScrollOffset) → double? -
Returns an estimate of the max scroll extent for all the children.
inherited
-
findIndexByKey(
Key key) → int? -
Find index of child element with associated key.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
shouldRebuild(
covariant ReorderableSliverChildBuilderDelegate oldDelegate) → bool -
Called whenever a new instance of the child delegate class is
provided to the sliver.
override
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited