Mouse hover is not working without chart dimensions

[re-ynd]

When I try to show a Chart without specifying dimensions for its parent, the mouse hover and possibly other gesture functions are not working. As soon as I specify the width and height for the the container which encapsulated the Chart, the gestures work. Here is an example code which you can use to recreate the bug.

If you run the exact code in a browser, you can see the crosshairs. But if you remove width: 600 and/or height: 400 from the code below, the hover stops working and I cannot see the crosshairs.

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:graphic/graphic.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Container(
          // Commenting out the next two lines is causing the problem
          width: 600,
          height: 400,
          child: Chart(
            data: [
              {'year': DateTime(2010), 'price': 10},
              {'year': DateTime(2011), 'price': 8},
              {'year': DateTime(2012), 'price': 12},
              {'year': DateTime(2013), 'price': 16},
              {'year': DateTime(2014), 'price': 9},
              {'year': DateTime(2015), 'price': 17},
              {'year': DateTime(2016), 'price': 13},
            ],
            variables: {
              'year': Variable(
                accessor: (Map map) => map['year'] as DateTime,
              ),
              'price': Variable(
                accessor: (Map map) => map['price'] as int,
              ),
            },
            elements: [LineElement()],
            axes: [
              Defaults.horizontalAxis,
              Defaults.verticalAxis,
            ],
            selections: {
              'tooltipMouse': PointSelection(
                on: {GestureType.hover},
                devices: {PointerDeviceKind.mouse},
              ),
            },
            crosshair: CrosshairGuide(),
          ),
        ),
      ),
    );
  }
}

Any help is much appreciated. Thanks!

[entronad]

This is bug, when parent container has no indicated size, the chart will not inflate (Though painting is not affected).
It has been fixed in v0.7.0, it will always inflate the parent container now. Please upgrade and have a try.

[re-ynd]

Great! It works well with v0.7.0. Thanks!