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Splits main.dart into hn-webview & hn-state dart files
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4 files changed

+251
-177
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4 files changed

+251
-177
lines changed

‎lib/hn-state.dart‎

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import 'package:flutter/material.dart';
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import 'dart:async';
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import 'package:http/http.dart' as http;
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import 'dart:convert';
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import 'package:shared_preferences/shared_preferences.dart';
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import 'package:advanced_share/advanced_share.dart';
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import 'package:hackernews/hn-webview.dart';
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class HackerNews extends StatefulWidget {
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final String url;
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final int currentPage;
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HackerNews({Key key, @required this.url, @required this.currentPage}): super(key: key);
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@override
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HackerNewsState createState() => new HackerNewsState(url: this.url, currentPage: this.currentPage);
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}
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class Title extends StatelessWidget {
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final String text;
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final bool urlOpened;
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Title({Key key, @required this.text, @required this.urlOpened}): super(key: key);
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@override
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Widget build(BuildContext context) {
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return Text(
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text,
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style: TextStyle(
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fontSize: 16.0,
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fontWeight: FontWeight.w500,
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color: urlOpened ? Colors.grey : Colors.black,
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)
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);
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}
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}
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class TimeAgo extends StatelessWidget {
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final String text;
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TimeAgo({Key key, @required this.text}): super(key: key);
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@override
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Widget build(BuildContext context) {
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return Text(
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text,
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style: TextStyle(
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color: Colors.grey,
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fontSize: 14.0,
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)
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);
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}
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}
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class HackerNewsState extends State<HackerNews> {
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int currentPage;
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int lastItemIndex = -1;
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List data = [];
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List<int> loadedIndices = [];
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List<String> openedLinks = [];
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String url;
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HackerNewsState({Key key, @required this.url, @required this.currentPage});
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@override
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void initState() {
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super.initState();
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this._getJSONData();
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this._loadOpenedLinks();
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}
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void _loadOpenedLinks() async {
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SharedPreferences prefs = await SharedPreferences.getInstance();
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List<String> _openedLinks = (prefs.getStringList("openedLinks") ?? []);
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setState(() {
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openedLinks = _openedLinks;
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});
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}
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Future<String> _getJSONData() async {
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// String url = "https://api.hnpwa.com/v0/news/" + currentPage.toString() + ".json";
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String _url = this.url + currentPage.toString() + ".json";
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var response = await http.get(
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Uri.encodeFull(_url),
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headers: {"Accept": "application/json"},
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);
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setState(() {
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for (var value in jsonDecode(response.body)) {
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data.add(value);
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}
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lastItemIndex = data.length - 1;
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});
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return "Successful";
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}
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void _incrementPageNum() {
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if (currentPage + 1 == 5) {
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return;
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}
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currentPage = currentPage + 1;
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}
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void _updateOpenedLinks(String url, String source) async {
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// SharedPreferences.setMockInitialValues({});
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SharedPreferences prefs = await SharedPreferences.getInstance();
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var urlOpened = openedLinks.contains(url) == true;
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var allowedStateUpdates = (source == "onTap" && urlOpened == false) || (source == "onLongPress");
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if (allowedStateUpdates) {
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setState(() {
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urlOpened ? openedLinks.remove(url) : openedLinks.add(url);
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});
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await prefs.setStringList("openedLinks", openedLinks);
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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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return Scaffold(
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appBar: AppBar(
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title: Text("HackerNews top posts"),
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),
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body: ListView.builder(
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itemCount: data == null ? 0 : data.length,
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itemBuilder: (BuildContext context, int index) {
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var urlChecked = openedLinks.contains(data[index]["url"]);
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if (index > 0 && index % 29 == 0 && loadedIndices.contains(index) == false) {
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_incrementPageNum();
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_getJSONData();
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loadedIndices.add(index);
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}
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return GestureDetector(
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onTap: () {
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if (data[index]["url"].startsWith("item?")) {
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Navigator.push(
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context,
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MaterialPageRoute(
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builder: (context) => HNWebView(
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url: "https://news.ycombinator.com/" + data[index]["url"],
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title: data[index]["title"]
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)
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)
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);
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} else {
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Navigator.push(
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context,
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MaterialPageRoute(
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builder: (context) => HNWebView(
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url: data[index]["url"],
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title: data[index]["title"]
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)
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)
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);
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}
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_updateOpenedLinks(data[index]["url"], "onTap");
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},
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onLongPress: () {
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var flag = openedLinks.contains(data[index]["url"]) ? "not read" : "read";
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final snackBar = SnackBar(content: Text("Marking as " + flag.toString() + ": " + data[index]["title"]), duration: Duration(milliseconds: 500));
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Scaffold.of(context).showSnackBar(snackBar);
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Future.delayed(const Duration(milliseconds: 850), () {
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_updateOpenedLinks(data[index]["url"], "onLongPress");
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});
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},
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child: Container(
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child: Card(
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child: Container(
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child: Column(
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children: <Widget>[
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Title(
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text: data[index]["title"],
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urlOpened: urlChecked,
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),
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Container(
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margin: EdgeInsets.only(top: 10.0),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: <Widget>[
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TimeAgo(text: data[index]["time_ago"]),
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GestureDetector(
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onTap: () {
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String __url = data[index]["url"].startsWith("item?") ? "https://news.ycombinator.com/" + data[index]["url"] : data[index]["url"];
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AdvancedShare.whatsapp(
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msg: data[index]["title"] + " - " + __url
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).then((_) => {
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});
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},
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child: Container(
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child: Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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Text("Share", style: TextStyle(color: Colors.grey, fontSize: 16.0)),
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Container(
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child: Icon(Icons.share, color: Colors.grey, size: 22.0,),
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margin: EdgeInsets.only(left: 5.0),
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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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]
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),
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padding: EdgeInsets.all(16.0),
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),
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elevation: 2.0,
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margin: EdgeInsets.only(
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top: 16.0,
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bottom: index == data.length - 1 ? 16.0 : 0.0,
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left: 10.0,
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right: 10.0,
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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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}

‎lib/hn-webview.dart‎

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import 'package:flutter/material.dart';
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import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
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class HNWebView extends StatelessWidget {
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final String url;
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final String title;
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HNWebView({Key key, @required this.url, @required this.title}): super(key: key);
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@override
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Widget build(BuildContext context) {
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return WebviewScaffold(
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url: url,
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appBar: AppBar(
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title: Text(title),
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),
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withZoom: false,
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withLocalStorage: true,
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);
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}
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}

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