FirestoreQueryBuilder<Document> class

Listens to a query and paginates the result in a way that is compatible with infinite scroll views, such as ListView or GridView.

FirestoreQueryBuilder will subscribe to the query and obtain the first pageSize items (10 by default). Then as the UI needs to render more items, it is possible to call FirestoreQueryBuilderSnapshot.fetchMore to obtain more items.

FirestoreQueryBuilder is independent from how the query will be rendered and as such can be used with any existing widget for rendering list of items.

An example of how to combine FirestoreQueryBuilder with ListView would be:

FirestoreQueryBuilder<Movie>(
  query: moviesCollection.orderBy('title'),
  builder: (context, snapshot, _) {
    if (snapshot.isFetching) {
      return const CircularProgressIndicator();
    }
    if (snapshot.hasError) {
      return Text('error ${snapshot.error}');
    }

    return ListView.builder(
      itemCount: snapshot.docs.length,
      itemBuilder: (context, index) {
        // if we reached the end of the currently obtained items, we try to
        // obtain more items
        if (snapshot.hasMore && index + 1 == snapshot.docs.length) {
          // Tell FirestoreQueryBuilder to try to obtain more items.
          // It is safe to call this function from within the build method.
          snapshot.fetchMore();
        }

        final movie = snapshot.docs[index];
        return Text(movie.title);
      },
    );
  },
)
Inheritance
Implementers

Constructors

FirestoreQueryBuilder({Key? key, required Query<Document> query, required FirestoreQueryBuilderSnapshotBuilder<Document> builder, int pageSize = 10, Widget? child})
Listens to a query and paginates the result in a way that is compatible with infinite scroll views, such as ListView or GridView.
const

Properties

builder → FirestoreQueryBuilderSnapshotBuilder<Document>
final
child → Widget?
A widget that will be passed to builder for optimizations purpose.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
pageSize → int
The number of items that will be fetched at a time.
final
query → Query<Document>
The query that will be paginated.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → _FirestoreQueryBuilderState<Document>
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