dynamic_widget 1.0.3

You can dynamic update your flutter page with Flutter Dynamic Widget. It's a light json UI protocol, which is very similar with flutter widget code. So you don't need to learn another UI protocol, if [...]

example/lib/main.dart

import 'dart:async';

import 'package:dynamic_widget/dynamic_widget.dart';
import 'package:flutter/material.dart';

import 'widget_json.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Dynamic Widget',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Dynamic Widget Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
        appBar: AppBar(
          // Here we take the value from the MyHomePage object that was created by
          // the App.build method, and use it to set our appbar title.
          title: Text(widget.title),
        ),
        body: GridView.count(
          mainAxisSpacing: 10,
          crossAxisCount: 3,
          padding: EdgeInsets.all(20),
          crossAxisSpacing: 10,
          children: <Widget>[
            RaisedButton(
              child: Text("Container"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(containerJson)));
              },
            ),
            RaisedButton(
              child: Text("Row"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(rowJson)));
              },
            ),
            RaisedButton(
              child: Text("Column"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(columnJson)));
              },
            ),
            RaisedButton(
              child: Text("Text"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(textJson)));
              },
            ),
            RaisedButton(
              child: Text("TextSpan"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(textSpanJson)));
              },
            ),
            RaisedButton(
              child: Text("RaisedButton"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) =>
                            CodeEditorPage(raisedButtonJson)));
              },
            ),
            RaisedButton(
              child: Text("Asset Image"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(assetImageJson)));
              },
            ),
            RaisedButton(
              child: Text("Network Image"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) =>
                            CodeEditorPage(networkImageJson)));
              },
            ),
            RaisedButton(
              child: Text("Placeholder"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(placeholderJson)));
              },
            ),
            RaisedButton(
              child: Text("GridView"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(gridviewJson)));
              },
            ),
            RaisedButton(
              child: Text("ListView"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(listviewJson)));
              },
            ),
            RaisedButton(
              child: Text("PageView"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(pageviewJson)));
              },
            ),
            RaisedButton(
              child: Text("Expanded"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(expandedJson)));
              },
            ),
            RaisedButton(
              child: Text("ListView Auto load more"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) =>
                            CodeEditorPage(listviewLoadmoreJson)));
              },
            ),
            RaisedButton(
              child: Text("GridView Auto load more"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) =>
                            CodeEditorPage(gridviewloadmoreJson)));
              },
            ),
            RaisedButton(
              child: Text("Stack and Positioned"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(stackJson)));
              },
            ),
            RaisedButton(
              child: Text("IndexedStack"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) =>
                            CodeEditorPage(indexedstackJson)));
              },
            ),
            RaisedButton(
              child: Text("SizedBox"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(sizedboxJson)));
              },
            ),
            RaisedButton(
              child: Text("Opacity"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(opacityJson)));
              },
            ),
            RaisedButton(
              child: Text("Wrap"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(wrapJson)));
              },
            ),
            RaisedButton(
              child: Text("ClipRRect"),
              onPressed: () {
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => CodeEditorPage(cliprrectJson)));
              },
            ),
          ],
        ));
  }
}

class CodeEditorPage extends StatefulWidget {
  final String jsonString;
  CodeEditorPage(this.jsonString);

  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return _CodeEditorPageState(jsonString);
  }
}

class _CodeEditorPageState extends State<CodeEditorPage> {
  String jsonString;
  TextEditingController controller = TextEditingController();

  _CodeEditorPageState(this.jsonString);

  @override
  Widget build(BuildContext context) {
    var widget = Scaffold(
        appBar: AppBar(
          // Here we take the value from the MyHomePage object that was created by
          // the App.build method, and use it to set our appbar title.
          title: Text("Code Editor"),
        ),
        body: Column(
          children: <Widget>[
            Expanded(
              child: Container(
                margin: EdgeInsets.all(8),
                padding: EdgeInsets.all(8),
                constraints: BoxConstraints.expand(
                    width: double.infinity, height: double.infinity),
                child: TextField(
                  controller: controller,
                  decoration: InputDecoration(hintText: 'Enter json string'),
                  maxLines: 1000000,
                ),
              ),
            ),
            SizedBox(
              height: 8,
            ),
            RaisedButton(
              child: Text("Preview"),
              onPressed: () {
                setState(() {
                  jsonString = controller.text;
                });
                Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => PreviewPage(controller.text)));
              },
            )
          ],
        ));
    controller.text = jsonString;
    return widget;
  }
}

class PreviewPage extends StatelessWidget {
  final String jsonString;

  PreviewPage(this.jsonString);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text("Preview"),
      ),
      body: FutureBuilder<Widget>(
        future: _buildWidget(context),
        builder: (BuildContext context, AsyncSnapshot<Widget> snapshot) {
          if (snapshot.hasError) {
            print(snapshot.error);
          }
          return snapshot.hasData
              ? SizedBox.expand(
                  child: snapshot.data,
                )
              : Text("Loading...");
        },
      ),
    );
  }

  Future<Widget> _buildWidget(BuildContext context) async {
    return DynamicWidgetBuilder().build(jsonString, context, new DefaultClickListener());
  }
}

class DefaultClickListener implements ClickListener {
  @override
  void onClicked(String event) {
    print("Receive click event: " + event);
  }
}