MessageListCore class

MessageListCore is a simplified class that allows fetching a list of messages while exposing UI builders.

A MessageListController is used to paginate data.

class ChannelPage extends StatelessWidget {
  const ChannelPage({
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: <Widget>[
          Expanded(
            child: MessageListCore(
        emptyBuilder: (context) {
          return Center(
            child: Text('Nothing here...'),
          );
        },
        loadingBuilder: (context) {
          return Center(
            child: CircularProgressIndicator.adaptive(),
          );
        },
        messageListBuilder: (context, list) {
          return MessagesPage(list);
        },
        errorBuilder: (context, err) {
          return Center(
            child: Text('Error'),
          );
        },
            ),
          ),
        ],
      ),
    );
  }
}

Make sure to have a StreamChannel ancestor in order to provide the information about the channels.

The widget uses a ListView.custom to render the list of channels.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatefulWidget
• MessageListCore

Constructors

MessageListCore({Key? key, required WidgetBuilder loadingBuilder, required WidgetBuilder emptyBuilder, required Widget messageListBuilder(BuildContext, List<Message>), required ErrorBuilder errorBuilder, Message? parentMessage, MessageListController? messageListController, bool messageFilter(Message)?, int paginationLimit = 20})

Instantiate a new MessageListView.

const

Properties

emptyBuilder → WidgetBuilder

Function used to build an empty widget

final

errorBuilder → ErrorBuilder

Callback triggered when an error occurs while performing the given request.

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

loadingBuilder → WidgetBuilder

Function used to build a loading widget

final

messageFilter → bool Function(Message)?

Predicate used to filter messages

final

messageListBuilder → Widget Function(BuildContext, List<Message>)

Function called when messages are fetched

final

messageListController → MessageListController?

A MessageListController allows pagination. Use ChannelListController.paginateData pagination.

final

paginationLimit → int

Limit used to paginate messages

final

parentMessage → Message?

If the current message belongs to a thread, this property represents the first message or the parent of the conversation.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

createElement() → StatefulElement

Creates a StatefulElement to manage this widget's location in the tree.

inherited

createState() → MessageListCoreState

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

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent 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 DiagnosticsNode.toStringDeep.

inherited

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