128 lines
3.4 KiB
Dart
128 lines
3.4 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter_breadcrumb/flutter_breadcrumb.dart';
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import 'package:provider/provider.dart';
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class _BreadCrumbNode {
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String name;
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Widget widget;
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_BreadCrumbNode? next;
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_BreadCrumbNode(this.name, this.widget);
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}
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class BreadCrumbController extends ChangeNotifier {
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final Widget defaultRoute;
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final String rootName;
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late _BreadCrumbNode _rootPage = _BreadCrumbNode(rootName, defaultRoute);
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late Widget _currentpage = _rootPage.widget;
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void pushPage(Widget widget, String name) {
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_last(_rootPage).next = _BreadCrumbNode(name, widget);
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_currentpage = widget;
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notifyListeners();
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}
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void switchPage(String name) {
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final pageNode = _findPage(name, _rootPage);
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if (pageNode != null) {
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_currentpage = pageNode.widget;
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// hope for garbage collector to free the floating items (;
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pageNode.next = null;
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}
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notifyListeners();
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}
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List<String> getNames() {
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return _genNameList(_rootPage);
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}
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Widget getCurrentPage() {
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return _currentpage;
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}
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_BreadCrumbNode _last(_BreadCrumbNode node) {
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if (node.next != null) {
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return _last(node.next!);
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} else {
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return node;
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}
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}
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_BreadCrumbNode? _findPage(String name, _BreadCrumbNode node) {
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if (node.name == name) {
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return node;
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}
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if (node.next != null) {
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return _findPage(name, node.next!);
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} else {
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return null;
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}
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}
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List<String> _genNameList(_BreadCrumbNode node) {
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if (node.next != null) {
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return _genNameList(node.next!)..insert(0, node.name);
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} else {
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return [node.name];
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}
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}
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BreadCrumbController(this.defaultRoute, this.rootName);
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}
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class BreadCrumbPage extends StatefulWidget {
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const BreadCrumbPage(
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{Key? key, required this.mainPage, required this.rootName})
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: super(key: key);
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final Widget mainPage;
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final String rootName;
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@override
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State<BreadCrumbPage> createState() => _BreadCrumbPageState();
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}
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class _BreadCrumbPageState extends State<BreadCrumbPage> {
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@override
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Widget build(BuildContext context) {
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return ChangeNotifierProvider<BreadCrumbController>(
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create: (BuildContext context) =>
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BreadCrumbController(widget.mainPage, widget.rootName),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Padding(
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padding: const EdgeInsets.only(left: 12, top: 8, bottom: 8),
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child: Consumer<BreadCrumbController>(
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builder: (_, controller, __) => BreadCrumb(
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items: controller
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.getNames()
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.map((e) => BreadCrumbItem(
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padding: const EdgeInsets.all(2),
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content: Text(e,
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style: Theme.of(context).textTheme.labelMedium),
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onTap: () {
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controller.switchPage(e);
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},
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))
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.toList(growable: false),
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divider: Icon(
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Icons.chevron_right,
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color: Theme.of(context).textTheme.labelMedium?.color,
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),
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),
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),
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),
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Divider(color: Colors.white.withOpacity(0.3), height: 1),
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Consumer<BreadCrumbController>(
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builder: (_, value, __) => value.getCurrentPage(),
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)
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// currentPage
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],
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),
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);
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}
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}
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