Skip to content

Instantly share code, notes, and snippets.

@sakiyamaK
Last active November 24, 2019 14:15
Show Gist options
  • Save sakiyamaK/37af21b249362b321be47b3159714761 to your computer and use it in GitHub Desktop.
Save sakiyamaK/37af21b249362b321be47b3159714761 to your computer and use it in GitHub Desktop.
widgetとsubwidget間で直接参照の仕方
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key}) : super(key: key);
final name = "MyHomePage";
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final name = "_MyHomePageState";
GlobalKey<_SubWidgetState> subWidgetGlobalKey = GlobalKey();
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("自分のパラメータ ${widget.name}"),
Text("自分のStateのパラメータ ${this.name}"),
Text("子のパラメータ ${subWidgetGlobalKey.currentState.widget.name}"),
Text("子のStateのパラメータ ${subWidgetGlobalKey.currentState.name}"),
Text("---------------------"),
SubWidget(
key: subWidgetGlobalKey,
),
],
),
),
);
}
}
class SubWidget extends StatefulWidget {
SubWidget({Key key}) : super(key: key);
final name = "SubWiget";
@override
_SubWidgetState createState() => _SubWidgetState();
}
class _SubWidgetState extends State<SubWidget> {
var name = "_SubWidgetState";
@override
Widget build(BuildContext context) {
//親widgetを探す(正確に言うとclassが同じやつ)
final MyHomePage homePage =
context.findAncestorWidgetOfExactType<MyHomePage>();
//親Stateを探す(正確に言うとclassが同じやつ)
final _MyHomePageState homePageState =
context.findAncestorStateOfType<_MyHomePageState>();
return Container(
child: Column(
children: <Widget>[
Text("親のパラメータ1 ${homePage.name}"),
Text("親のパラメータ2 ${homePageState.widget.name}"),
Text("親のStateのパラメータ ${homePageState.name}"),
],
),
);
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment