Raid_Manager/app/lib/breadcrumb_page/breadcrumb_controller.dart
2022-12-09 15:44:27 +01:00

63 lines
1.4 KiB
Dart

import 'package:flutter/widgets.dart';
class _BreadCrumbNode {
String name;
Widget widget;
_BreadCrumbNode? next;
_BreadCrumbNode(this.name, this.widget);
}
class BreadCrumbController extends ChangeNotifier {
final Widget defaultRoute;
final String rootName;
late final _BreadCrumbNode _rootPage =
_BreadCrumbNode(rootName, defaultRoute);
late Widget _currentpage = _rootPage.widget;
void pushPage(Widget widget, String name) {
_findPage(null, _rootPage).next = _BreadCrumbNode(name, widget);
_currentpage = widget;
notifyListeners();
}
void switchPage(String name) {
final pageNode = _findPage(name, _rootPage);
_currentpage = pageNode.widget;
// hope for garbage collector to free the floating items (;
pageNode.next = null;
notifyListeners();
}
List<String> getNames() {
return _genNameList(_rootPage);
}
Widget getCurrentPage() {
return _currentpage;
}
_BreadCrumbNode _findPage(String? name, _BreadCrumbNode node) {
if (node.name == name) {
return node;
}
if (node.next != null) {
return _findPage(name, node.next!);
} else {
return node;
}
}
List<String> _genNameList(_BreadCrumbNode node) {
if (node.next != null) {
return _genNameList(node.next!)..insert(0, node.name);
} else {
return [node.name];
}
}
BreadCrumbController(this.defaultRoute, this.rootName);
}