63 lines
1.4 KiB
Dart
63 lines
1.4 KiB
Dart
import 'package:flutter/widgets.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 final _BreadCrumbNode _rootPage =
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_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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_findPage(null, _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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_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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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 _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 node;
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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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