TwoDimensionalChildBuilderDelegate class
A delegate that supplies children for a TwoDimensionalScrollView using a builder callback.
The widgets returned from the builder callback are automatically wrapped in RepaintBoundary widgets if addRepaintBoundaries is true (also the default).
See also:
- TwoDimensionalChildListDelegate, which is a similar delegate that has an explicit two dimensional array of children.
- SliverChildBuilderDelegate, which is a delegate that uses a builder callback to construct the children in one dimension instead of two.
- SliverChildListDelegate, which is a delegate that has an explicit list of children in one dimension instead of two.
- Inheritance
-
- Object
- ChangeNotifier
- TwoDimensionalChildDelegate
- TwoDimensionalChildBuilderDelegate
Constructors
- TwoDimensionalChildBuilderDelegate({required TwoDimensionalIndexedWidgetBuilder builder, int? maxXIndex, int? maxYIndex, bool addRepaintBoundaries = true, bool addAutomaticKeepAlives = true})
- Creates a delegate that supplies children for a TwoDimensionalScrollView using the given builder callback.
Properties
- addAutomaticKeepAlives → bool
-
Whether to wrap each child in an AutomaticKeepAlive.
final
- addRepaintBoundaries → bool
-
Whether to wrap each child in a RepaintBoundary.
final
- builder → TwoDimensionalIndexedWidgetBuilder
-
Called to build children on demand.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- hasListeners → bool
-
Whether any listeners are currently registered.
no setterinherited
- maxXIndex ↔ int?
-
The maximum ChildVicinity.xIndex for children in the x axis.
getter/setter pair
- maxYIndex ↔ int?
-
The maximum ChildVicinity.yIndex for children in the y axis.
getter/setter pair
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
addListener(
VoidCallback listener) → void -
Register a closure to be called when the object changes.
inherited
-
build(
BuildContext context, ChildVicinity vicinity) → Widget? -
Returns the child with the given ChildVicinity, which is described in
terms of x and y indices.
override
-
dispose(
) → void -
Discards any resources used by the object. After this is called, the
object is not in a usable state and should be discarded (calls to
addListener will throw after the object is disposed).
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
notifyListeners(
) → void -
Call all the registered listeners.
inherited
-
removeListener(
VoidCallback listener) → void -
Remove a previously registered closure from the list of closures that are
notified when the object changes.
inherited
-
shouldRebuild(
covariant TwoDimensionalChildDelegate oldDelegate) → bool -
Called whenever a new instance of the child delegate class is
provided.
override
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited