Rotation does not work properly when using custom child.

[janniklind]

Hi.

I am trying to get the rotation to work with a custom child, however it seems that the point it rotates around is wrong. I would expect it to rotate around the center point of the custom child.

See the example below. It is the original RotationExample, however with the original custom child from the CustomChildExample.

import 'package:flutter/material.dart';
import 'package:photo_view/photo_view.dart';
import './app_bar.dart';
import 'package:flutter_svg/flutter_svg.dart';

class RotationExamples extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: <Widget>[
          const ExampleAppBar(
            title: "Rotation Example",
            showGoBack: true,
          ),
          Expanded(
              child: Column(
            children: <Widget>[
              Container(
                padding: const EdgeInsets.all(20.0),
                child: const Text(
                  "Example using option enableRotation, just pinch an rotate",
                  style: const TextStyle(fontSize: 18.0),
                ),
              ),
              Container(
                  margin: const EdgeInsets.symmetric(vertical: 20.0),
                  height: 300.0,
                  child: ClipRect(
                    /*
                    child: PhotoView(
                      imageProvider: const AssetImage("assets/large-image.jpg"),
                      maxScale: PhotoViewComputedScale.covered,
                      initialScale: PhotoViewComputedScale.contained * 0.8,
                      enableRotation: true,
                    )
                    */
                    child: PhotoView.customChild(
                      child: Container(
                          decoration:
                          const BoxDecoration(color: Colors.lightGreenAccent),
                          padding: const EdgeInsets.all(10.0),
                          child: Column(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: <Widget>[
                              const Text(
                                "Hello there, this is a text, that is a svg",
                                style: const TextStyle(fontSize: 10.0),
                                textAlign: TextAlign.center,
                              ),
                              SvgPicture.asset(
                                "assets/firefox.svg",
                                height: 100.0,
                              )
                            ],
                          )),
                      childSize: const Size(220.0, 250.0),
                      initialScale: 1.0,
                      enableRotation: true,
                    )
                  )
              ),
            ],
          ))
        ],
      ),
    );
  }
}

[renancaraujo]

Fixed on 0.6.0