我一直在尝试创建带有一些导航按钮的背景菜单,每个按钮都有自己的无状态小部件页面。我想根据单击菜单的索引位置传递子小部件页面。
backlayer.dart
class BackLayer extends StatefulWidget {
AnimationController controller;
Widget child;
BackLayer({this.controller});
_BackLayerState createState() => _BackLayerState();
}
class _BackLayerState extends State<BackLayer> {
var _currentPageIndex;
List<String> navlist = ['Home', 'About', 'Contact Us'];
bool get isPanelVisible {
final AnimationStatus status = widget.controller.status;
return status == AnimationStatus.completed ||
status == AnimationStatus.forward;
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: ListView.builder(
itemCount: navlist.length,
itemBuilder: (BuildContext context, int index) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
ListTile(
onTap: () {
setState(() {
_currentPageIndex = navlist[index];
});
// PanelClass(frontLayer: About(),);
print(navlist[index].toString());
widget.controller
.fling(velocity: isPanelVisible ? -1.0 : 1.0);
},
title: Text(
navlist[index],
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.black87, fontWeight: FontWeight.bold),
),
)
],
);
我想在背景.dart 中传递单击菜单的引用,我将在其中将该引用传递给 panelClass body 作为子级。
背景.dart
class BackDrop extends StatefulWidget {
_BackDropState createState() => _BackDropState();
}
class _BackDropState extends State<BackDrop> with TickerProviderStateMixin {
AnimationController controller;
@override
void initState() {
super.initState();
controller = AnimationController(
duration: Duration(seconds: 3), vsync: this, value: 1.0);
}
@override
void dispose() {
super.dispose();
controller.dispose();
}
bool get isPanelVisible {
final AnimationStatus status = controller.status;
return status == AnimationStatus.completed ||
status == AnimationStatus.forward;
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
elevation: 0.0,
backgroundColor: Theme.of(context).accentColor,
title: Text('Home'),
leading: IconButton(
onPressed: () {
controller.fling(velocity: isPanelVisible ? -1.0 : 1.0);
},
icon: AnimatedIcon(
progress: controller.view,
icon: AnimatedIcons.close_menu,
),
),
),
body: PanelClass(controller: controller,frontLayer: 'Need to get reference here',),
);
}
}