100 lines
2.9 KiB
Dart
100 lines
2.9 KiB
Dart
import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'paginator_listener.dart';
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typedef RowBuilder = Widget Function(dynamic);
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typedef OnScroll = void Function(bool down);
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class PaginatorListView<T> extends StatelessWidget {
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final PaginatorListener<T> paginatorListener;
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final RowBuilder rowBuilder;
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final OnScroll onScroll;
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final ScrollController _scrollController;
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final Color color;
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PaginatorListView(
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{Key key,
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this.paginatorListener,
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this.rowBuilder,
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this.onScroll,
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this.color = Colors.blueAccent})
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: _scrollController = ScrollController(),
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assert(paginatorListener != null),
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assert(rowBuilder != null),
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super(key: key) {
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_scrollController.addListener(() async {
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if (_scrollController.position.pixels ==
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_scrollController.position.maxScrollExtent) {
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paginatorListener.loadMore();
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}
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if (onScroll != null) {
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var down = _scrollController.position.userScrollDirection ==
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ScrollDirection.forward;
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onScroll(down);
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}
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});
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}
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@override
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Widget build(BuildContext context) {
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bool ended = paginatorListener.ended;
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int count = paginatorListener.data.length;
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if (ended) count++;
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return Column(
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children: [
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Expanded(
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child: RefreshIndicator(
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onRefresh: () {
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return paginatorListener.refresh();
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},
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child: ListView.separated(
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separatorBuilder: (context, index) =>
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Divider(height: 1, color: Colors.black),
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controller: _scrollController,
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scrollDirection: Axis.vertical,
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physics: const AlwaysScrollableScrollPhysics(),
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shrinkWrap: true,
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itemCount: count,
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itemBuilder: (BuildContext context, int index) {
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if (ended && index == count - 1) {
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return Padding(
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padding: const EdgeInsets.all(8.0),
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child: Center(child: Text("No more data")),
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);
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}
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T t = paginatorListener.data[index];
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return rowBuilder(t);
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}),
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),
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),
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paginatorListener.isLoading ? _loadingRow() : Container()
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],
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);
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}
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Widget _loadingRow() {
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return Container(
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padding: EdgeInsets.all(8),
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color: Colors.transparent,
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Column(
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children: [
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CircularProgressIndicator(
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valueColor: new AlwaysStoppedAnimation<Color>(color)),
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Text(
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"Loading...",
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style: TextStyle(color: color),
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)
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],
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),
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],
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),
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);
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}
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}
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