小编Mic*_*ger的帖子

我有一个可拖动的小部件（来自https://medium.com/flutter-community/create-a-draggable-widget-in-flutter-50b61f12635d），该容器中的堆栈（红色）由可移动的子代组成。这是小部件树：

我想添加一个手势转换作为FormBuilder（https://github.com/flutter/flutter/blob/master/examples/flutter_gallery/lib/demo/transformations/transformations_demo.dart）以转换矩阵，如您在GIF，主要是放大/缩小和转换x / y。

class _HomeViewState extends State<HomeView> {
  final _stackKey;
  _HomeViewState(this._stackKey);
  List<Widget> movableItems = [];

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: AppBar(
        title: Text('SynApp'),
        actions: <Widget>[
          IconButton(
            onPressed: () {
              x = 200.0;
              y = 200.0;
              setState(() {
                movableItems.add(
                  MoveableStackItem(_stackKey),
                );
              });
            },
            icon: Icon(Icons.add),
          ),
        ],
      ),
      body: LayoutBuilder(
          builder: (BuildContext context, BoxConstraints constraints) {
        // Draw the scene as big as is available, but allow the user to
        // translate …

当尝试使用 ionic-view ( www.ionicjs.com )编译 ionic 3 应用程序时，出现以下错误

Error: Cannot find module '@angular/tsc-wrapped/src/tsc'
    at Function.Module._resolveFilename (module.js:485:15)
    at Function.Module._load (module.js:437:25)
    at Module.require (module.js:513:17)
    at require (internal/module.js:11:18)
    at Object. (/usr/src/app/node_modules/@ionic/app-scripts/dist/aot/aot-compiler.js:7:13)
at Module._compile (module.js:569:30)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:503:32)
at tryModuleLoad (module.js:466:12)
at Function.Module._load (module.js:458:3)
npm info lifecycle MedMan@0.0.1~build: Failed to exec build script
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! MedMan@0.0.1 build: `ionic-app-scripts build`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the MedMan@0.0.1 build …