rename to one trip

one_trip/lib/widgets/pagination_listview.dart

@@ -0,0 +1,112 @@
+import "package:flutter/material.dart";
+
+enum ListViewState { inUse, changed, inactive }
+
+class PaginationListView extends StatefulWidget {
+  final Widget Function(BuildContext context, dynamic data) itemBuilder;
+  final Widget Function(BuildContext context, dynamic data) seperatorBuilder;
+  final bool? shrinkWrap;
+  final ListViewState state;
+  final Future<List<dynamic>> Function(int page) dataProvider;
+
+  const PaginationListView(
+      {super.key,
+      required this.itemBuilder,
+      required this.dataProvider,
+      required this.state,
+      required this.seperatorBuilder,
+      this.shrinkWrap});
+
+  @override
+  State<PaginationListView> createState() => _PaginationListViewState();
+}
+
+class _PaginationListViewState extends State<PaginationListView> {
+  int _pagesLoaded = 0;
+  List<dynamic> _data = [];
+  bool _dataLeft = true;
+  bool _isLoading = false;
+  ListViewState _state = ListViewState.inactive;
+  late ScrollController _scrollController;
+
+  void consumeData() async {
+    if (_state != ListViewState.inUse || _isLoading || !_dataLeft) {
+      return;
+    }
+
+    setState(() {
+      _isLoading = true;
+    });
+
+    List<dynamic> newData = await widget.dataProvider(_pagesLoaded + 1);
+    if (newData[newData.length - 1] == null) {
+      newData.removeAt(newData.length - 1);
+      _dataLeft = false;
+    }
+
+    _pagesLoaded++;
+
+    setState(() {
+      _data.addAll(newData);
+    });
+
+    setState(() {
+      _isLoading = false;
+    });
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _scrollController = ScrollController();
+    _state = widget.state;
+  }
+
+  @override
+  void didUpdateWidget(covariant PaginationListView oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    _state = widget.state;
+    if (_state == ListViewState.changed) {
+      _state = ListViewState.inUse;
+      _data = [];
+      _dataLeft = true;
+      _isLoading = false;
+      _pagesLoaded = 0;
+      consumeData();
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    List<Widget> stackChildren = [
+      NotificationListener<ScrollNotification>(
+        onNotification: (notification) {
+          if (_scrollController.position.maxScrollExtent ==
+              _scrollController.position.pixels) {
+            consumeData();
+          }
+          return true;
+        },
+        // child: Scrollbar(
+        child: ListView.separated(
+          controller: _scrollController,
+          itemCount: _data.length,
+          shrinkWrap: widget.shrinkWrap ?? false,
+          itemBuilder: (context, index) =>
+              widget.itemBuilder(context, _data[index]),
+          separatorBuilder: (context, index) =>
+              widget.seperatorBuilder(context, _data[index]),
+        ),
+      ),
+      // )
+    ];
+
+    if (_isLoading) {
+      stackChildren.add(const Center(child: CircularProgressIndicator()));
+    }
+
+    return Stack(
+      children: stackChildren,
+    );
+  }
+}