A widget provide a simple way to get child's rectangle information after rendered.
To use this plugin, add rect_getter as a dependency in your pubspec.yaml file.
// Import package
import 'package:rect_getter/rect_getter.dart';
// Instantiate it
var globalKey = RectGetter.createGlobalKey();
var rectGetter = RectGetter(
key: globalKey,
child: _child,
);
or
var rectGetter = RectGetter.defaultKey(
child: _child,
);
// and add it to your layout .
// then you can get rect by
Rect rect = rectGetter.getRect();
or
Rect rect = RectGetter.getRectFromKey(globalKey);
Read More : 利用RectGetter组件获取控件位置尺寸实现的几个高级效果和功能
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