Uses an IndexedWidgetBuilder to provide children for LazyBlock.
A LazyBlockBuilder rebuilds the children whenever the LazyBlock is rebuilt, similar to the behavior of Builder.
To use a Scrollbar with this delegate, you must provide an
estimateTotalExtent callback.
See also LazyBlockViewport.
- Inheritance
- Object
- LazyBlockDelegate
- LazyBlockBuilder
Constructors
- LazyBlockBuilder({IndexedWidgetBuilder builder, TotalExtentEstimator totalExtentEstimator })
-
Creates a LazyBlockBuilder based on the given builder.
Properties
- builder → IndexedWidgetBuilder
-
Returns a widget representing the item with the given index.
read-only - totalExtentEstimator → TotalExtentEstimator
-
Returns the estimated total height of the children, in pixels.
read-only - hashCode → int
-
Get a hash code for this object.
read-only, inherited - runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Operators
-
operator ==(
other) → bool -
The equality operator.
inherited
Methods
-
buildItem(
BuildContext context, int index) → Widget -
Returns a widget representing the item with the given index.
-
estimateTotalExtent(
int firstIndex, int lastIndex, double minOffset, double firstStartOffset, double lastEndOffset) → double -
Returns the estimated total height of the children, in pixels.
-
shouldRebuild(
LazyBlockDelegate oldDelegate) → bool -
Whether
LazyBlockshould evict its cache of widgets returned bybuildItem. -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited -
toString(
) → String -
Returns a string representation of this object.
inherited