flutter_widget_detector 0.1.2

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flutter_widget_detector #

A tool widget that can display file location where widgets are created and some info of widget type, e.g. widget key, size and position. No need to connect observatory or any other tools. Hopes it can help you locate the code quickly and solve UI problems.

Version #

If your flutter sdk is later than 1.7.8(included), please use version above 0.1.0. Otherwise use version below 0.1.0.

How to use #

  1. Edit your pubspec.yml file of your flutter project. And add code below in dev_dependencies:, because this only works in Debug mode.
    flutter_widget_detector: 0.1.2
  1. Place your Widget Detector as the parent of any widget to be detected, which is normally your app widget in the runApp() method, and wrap it with assert in order to exclude it from production build. For example:
    Widget appWidget = MaterialApp(...);
        appWidget = WidgetDetector(child: appWidget, isEnabled: true);
        return true;
    return appWidget;
  1. After you run the app, you can see a button with text "Detect Off" on the topmost of the screen. When it's off, the app can recognize the gestures as usual. When it's on, Widget Detector intercepts the gestures and only responds to tap where it will display its infos nearby.

How it works #

For current version, it uses the hit test method to get a list of render objects from HitTestResult of responding chain. By traversing the render object path from innerside to outside and also checking the file location of where the widget are constructed(thru widget_inspector in flutter framework), it get the render object you probably want to detect, paint the area and border with colors, and draw infos text.

It filters out the widgets created by flutter framework to let you focus on the widget you project creates.

And there is a flaw also, Row/Column or custom widgets that it doesn't override hit test method nor add itself to hit test path result can't be outlined currently. This will be fixed in the future update by traversing the element tree instead of using hit test methods.

[0.0.1] - Nov. 29th, 2019 #

  • Release the first version.

[0.1.0] - Dec. 1st, 2019 #

  • Add fix: For Flutter SDK version above 1.7.8, you need to use this version.

[0.1.1] - Feb. 16th, 2020 #

  • Add width * height info display.

[0.1.2] - Mar. 18th, 2020 #

  • Optimize commit.


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

void main() {
  Widget app = MyApp();
    app = WidgetDetector(
      child: app,
      isEnabled: true,
    return true;

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  Widget build(BuildContext context) {
    Widget appWidget = MaterialApp(
      title: 'Flutter Demo',
      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: 'Flutter Demo Home Page'),

      appWidget = WidgetDetector(child: appWidget, isEnabled: true,);
      return true;
    return appWidget;

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;

  _MyHomePageState createState() => _MyHomePageState();

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.

  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: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
              'You have pushed the button this many times:',
              style: Theme.of(context).textTheme.display1,
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  flutter_widget_detector: ^0.1.2

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:flutter_widget_detector/flutter_widget_detector.dart';
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Learn more about scoring.

We analyzed this package on Mar 27, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.6
  • Flutter: 1.12.13+hotfix.8

Health suggestions

Format lib/flutter_widget_detector.dart.

Run flutter format to format lib/flutter_widget_detector.dart.

Maintenance suggestions

Update README.md. (-2 points)

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Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies