CollectionView<T> class

The CollectionView widget is a wrapper for the ListView widget. It provides a simple way to display a list of items with full type safety.

Example:

CollectionView<String>(
  data: () => ['Item 1', 'Item 2', 'Item 3'],
  builder: (context, item) {
    return Container(
      color: item.isEven ? Colors.grey : Colors.white,
      child: Text('${item.data} at ${item.index}'),
    );
  },
)

With async data:

CollectionView<User>(
  data: () async => await api.fetchUsers(),
  builder: (context, item) => UserTile(user: item.data),
  empty: Text('No users found'),
)

With pull-to-refresh and pagination:

CollectionView<User>.pullable(
  data: (iteration) async => api.getUsers(page: iteration),
  builder: (context, item) => UserTile(user: item.data),
  onRefresh: () => print('Refreshed!'),
)

Inheritance

Available extensions

Constructors

CollectionView({Key? key, required CollectionItemBuilder<T> builder, required dynamic data(), dynamic transform(List<T> data)?, Widget? empty, LoadingStyle? loadingStyle, String? stateName, Axis? scrollDirection, bool? reverse, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool? shrinkWrap, EdgeInsets? padding, double? itemExtent, Widget? prototypeItem, ChildIndexGetter? findChildIndexCallback, bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, double? cacheExtent, int? semanticChildCount, DragStartBehavior? dragStartBehavior, ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior, String? restorationId, Clip? clipBehavior, Widget? header, dynamic sort(List<T> items)?, double? spacing}): const
CollectionView.grid({Key? key, required dynamic data(), required CollectionItemBuilder<T> builder, int? crossAxisCount = 2, double? mainAxisSpacing = 1.0, double? crossAxisSpacing = 1.0, dynamic transform(List<T> data)?, Widget? empty, LoadingStyle? loadingStyle, String? stateName, Axis? scrollDirection, bool? reverse, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool? shrinkWrap, EdgeInsets? padding, double? itemExtent, Widget? prototypeItem, ChildIndexGetter? findChildIndexCallback, bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, double? cacheExtent, int? semanticChildCount, DragStartBehavior? dragStartBehavior, ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior, String? restorationId, Clip? clipBehavior, Widget? header, dynamic sort(List<T> items)?, double? spacing}): const
CollectionView.pullable({Key? key, required CollectionItemBuilder<T> builder, required dynamic data(int iteration), dynamic onRefresh()?, dynamic beforeRefresh()?, dynamic afterRefresh(dynamic data)?, String? headerStyle, Widget? footerLoadingIcon, dynamic transform(List<T> data)?, Widget? empty, LoadingStyle? loadingStyle, String? stateName, Axis? scrollDirection, bool? reverse, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool? shrinkWrap, EdgeInsets? padding, double? itemExtent, Widget? prototypeItem, ChildIndexGetter? findChildIndexCallback, bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, double? cacheExtent, int? semanticChildCount, DragStartBehavior? dragStartBehavior, ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior, String? restorationId, Clip? clipBehavior, Widget? header, dynamic sort(List<T> items)?, double? spacing}): Creates a pullable list view with pull-to-refresh and pagination support.
const
CollectionView.pullableGrid({Key? key, required CollectionItemBuilder<T> builder, required dynamic data(int iteration), int? crossAxisCount = 2, double? mainAxisSpacing = 0, double? crossAxisSpacing = 0, dynamic onRefresh()?, dynamic beforeRefresh()?, dynamic afterRefresh(dynamic data)?, String? headerStyle, Widget? footerLoadingIcon, dynamic transform(List<T> data)?, Widget? empty, LoadingStyle? loadingStyle, String? stateName, Axis? scrollDirection, bool? reverse, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool? shrinkWrap, EdgeInsets? padding, double? itemExtent, Widget? prototypeItem, ChildIndexGetter? findChildIndexCallback, bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, double? cacheExtent, int? semanticChildCount, DragStartBehavior? dragStartBehavior, ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior, String? restorationId, Clip? clipBehavior, Widget? header, dynamic sort(List<T> items)?, double? spacing}): Creates a pullable grid view with pull-to-refresh and pagination support.
const
CollectionView.pullableSeparated({Key? key, required CollectionItemBuilder<T> builder, required dynamic data(int iteration), required IndexedWidgetBuilder? separatorBuilder, dynamic onRefresh()?, dynamic beforeRefresh()?, dynamic afterRefresh(dynamic data)?, String? headerStyle, Widget? footerLoadingIcon, dynamic transform(List<T> data)?, Widget? empty, LoadingStyle? loadingStyle, String? stateName, Axis? scrollDirection, bool? reverse, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool? shrinkWrap, EdgeInsets? padding, double? itemExtent, Widget? prototypeItem, ChildIndexGetter? findChildIndexCallback, bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, double? cacheExtent, int? semanticChildCount, DragStartBehavior? dragStartBehavior, ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior, String? restorationId, Clip? clipBehavior, Widget? header, dynamic sort(List<T> items)?, double? spacing}): Creates a pullable separated list view with pull-to-refresh and pagination support.
const
CollectionView.separated({Key? key, required dynamic data(), required CollectionItemBuilder<T> builder, required IndexedWidgetBuilder? separatorBuilder, dynamic transform(List<T> data)?, Widget? empty, LoadingStyle? loadingStyle, String? stateName, Axis? scrollDirection, bool? reverse, ScrollController? controller, bool? primary, ScrollPhysics? physics, bool? shrinkWrap, EdgeInsets? padding, double? itemExtent, Widget? prototypeItem, ChildIndexGetter? findChildIndexCallback, bool addAutomaticKeepAlives = true, bool addRepaintBoundaries = true, bool addSemanticIndexes = true, double? cacheExtent, int? semanticChildCount, DragStartBehavior? dragStartBehavior, ScrollViewKeyboardDismissBehavior? keyboardDismissBehavior, String? restorationId, Clip? clipBehavior, Widget? header, dynamic sort(List<T> items)?, double? spacing}): const

Properties

addAutomaticKeepAlives → bool: final
addRepaintBoundaries → bool: final
addSemanticIndexes → bool: final
afterRefresh → dynamic Function(dynamic data)?: final
beforeRefresh → dynamic Function()?: final
builder → CollectionItemBuilder<T>: final
cacheExtent → double?: final
clipBehavior → Clip?: final
controller → ScrollController?: final
crossAxisCount → int?: final
crossAxisSpacing → double?: final
data → dynamic Function()?: final
dragStartBehavior → DragStartBehavior?: final
empty → Widget?: final
findChildIndexCallback → ChildIndexGetter?: final
footerLoadingIcon → Widget?: final
hashCode → int: The hash code for this object.
no setterinherited
header → Widget?: final
headerStyle → String?: final
isPullable → bool: final
itemExtent → double?: final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
keyboardDismissBehavior → ScrollViewKeyboardDismissBehavior?: final
kind → CollectionViewKind: final
loadingStyle → LoadingStyle?: final
mainAxisSpacing → double?: final
onRefresh → dynamic Function()?: final
padding → EdgeInsets?: final
paginatedData → dynamic Function(int iteration)?: final
physics → ScrollPhysics?: final
primary → bool?: final
prototypeItem → Widget?: final
restorationId → String?: final
reverse → bool?: final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
scrollDirection → Axis?: final
semanticChildCount → int?: final
separatorBuilder → IndexedWidgetBuilder?: final
shrinkWrap → bool?: final
sort → dynamic Function(List<T> items)?: final
spacing → double?: final
stateName → String?: final
transform → dynamic Function(List<T> data)?: final

Methods

connectiveOr({required Widget offline}) → Widget: Available on Widget, provided by the ConnectiveExtension extension
Wraps the widget in a Connective that shows an offline placeholder.
createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<CollectionView<T>>: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
faderBottom({double strength = 0.2, Color color = Colors.black}) → FadeOverlay: Available on StatefulWidget, provided by the NyStatefulExt extension
Make gradient fader from the bottom of the widget. strength ranges from 0.0 (subtle) to 1.0 (strong).
faderFrom({double strength = 0.2, Color color = Colors.black, AlignmentGeometry begin = Alignment.topCenter, AlignmentGeometry end = Alignment.bottomCenter}) → FadeOverlay: Available on StatefulWidget, provided by the NyStatefulExt extension
Make gradient fader with custom alignment. strength ranges from 0.0 (subtle) to 1.0 (strong).
faderLeft({double strength = 0.2, Color color = Colors.black}) → FadeOverlay: Available on StatefulWidget, provided by the NyStatefulExt extension
Make gradient fader from the left of the widget. strength ranges from 0.0 (subtle) to 1.0 (strong).
faderRight({double strength = 0.2, Color color = Colors.black}) → FadeOverlay: Available on StatefulWidget, provided by the NyStatefulExt extension
Make gradient fader from the right of the widget. strength ranges from 0.0 (subtle) to 1.0 (strong).
faderTop({double strength = 0.2, Color color = Colors.black}) → FadeOverlay: Available on StatefulWidget, provided by the NyStatefulExt extension
Make gradient fader from the top of the widget. strength ranges from 0.0 (subtle) to 1.0 (strong).
flexible({Key? key, int flex = 1, FlexFit fit = FlexFit.loose}) → Flexible: Available on StatefulWidget, provided by the NyStatefulExt extension
Make a StatefulWidget Flexible.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
onlyOffline() → Widget: Available on Widget, provided by the ConnectiveExtension extension
Only shows the widget when offline, otherwise shows nothing.
onlyOnline() → Widget: Available on Widget, provided by the ConnectiveExtension extension
Only shows the widget when online, otherwise shows nothing.
pullable({required Future<void> onRefresh()?, PullableConfig? pullableConfig}) → Widget: Available on Widget, provided by the NyWidgetExt extension
Make a widget pullable using the Pullable widget.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode: Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toSkeleton({Key? key, bool? ignoreContainers, bool? justifyMultiLineText, Color? containersColor, bool ignorePointers = true, bool enabled = true, PaintingEffect? effect, TextBoneBorderRadius? textBoneBorderRadius}) → Skeletonizer: Available on Widget, provided by the NyWidgetExt extension
Make a widget a skeleton using the Skeletonizer package.
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String: A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → 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

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Methods

removeFromIndex(String stateName, int index) → void: Removes an item from the list at the given index.
stateReset(String stateName) → void: Resets the state.