A sliver that places its box children in a linear array and constrains them to have the same extent as a prototype item along the main axis.

SliverPrototypeExtentList arranges its children in a line along the main axis starting at offset zero and without gaps. Each child is constrained to the same extent as the prototypeItem along the main axis and the SliverConstraints.crossAxisExtent along the cross axis.

SliverPrototypeExtentList is more efficient than SliverList because SliverPrototypeExtentList does not need to lay out its children to obtain their extent along the main axis. It's a little more flexible than SliverFixedExtentList because there's no need to determine the appropriate item extent in pixels.

See also:

  • SliverFixedExtentList, whose itemExtent is a pixel value.
  • SliverList, which does not require its children to have the same extent in the main axis.
  • SliverFillViewport, which sizes its children based on the size of the viewport, regardless of what else is in the scroll view.
  • SliverList, which shows a list of variable-sized children in a viewport.
Inheritance

Constructors

SliverPrototypeExtentList({Key key, @required SliverChildDelegate delegate, @required Widget prototypeItem })
Creates a sliver that places its box children in a linear array and constrains them to have the same extent as a prototype item along the main axis.
const

Properties

prototypeItem Widget
Defines the main axis extent of all of this sliver's children. [...]
final
delegate SliverChildDelegate
The delegate that provides the children for this widget. [...]
final, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

createElement() → _SliverPrototypeExtentListElement
createRenderObject(BuildContext context) → _RenderSliverPrototypeExtentList
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder description) → void
inherited
didUnmountRenderObject(RenderObject renderObject) → void
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
@protected, inherited
estimateMaxScrollOffset(SliverConstraints constraints, int firstIndex, int lastIndex, double leadingScrollOffset, double trailingScrollOffset) double
Returns an estimate of the max scroll extent for all the children. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toDiagnosticsNode({String name, DiagnosticsTreeStyle style }) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this object.
inherited
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a string representation of this node and its descendants. [...]
inherited
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns a one-line detailed description of the object. [...]
inherited
toStringShort() String
A short, textual description of this widget.
inherited
updateRenderObject(BuildContext context, RenderObject renderObject) → void
Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject. [...]
@protected, inherited

Operators

operator ==(other) bool
The equality operator. [...]
inherited