Provides children for LazyBlock or LazyBlockViewport.
See also LazyBlockBuilder for an implementation of LazyBlockDelegate based on an IndexedWidgetBuilder closure.
Constructors
- LazyBlockDelegate()
-
Abstract const constructor. This constructor enables subclasses to provide const constructors so that they can be used in const expressions.
const
Properties
- 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 LazyBlock should evict its cache of widgets returned by buildItem.
-
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