flutter pub add measured_size基于插件公开信息、社区数据与项目使用情况整理的选型参考。
measured_size 包是一个 Flutter 小部件，可在运行时动态计算并暴露其子小部件的大小。它包装一个子小部件，并提供其实际渲染的尺寸，这在基于实时测量进行布局调整时非常有用。当构建需要精确尺寸的响应式或自适应 UI 时，这一点尤其有帮助。该包可在所有主要平台（包括 Android、iOS、Web、macOS、Windows 和 Linux）上正常工作。
以下为关联源码仓库的 README 原文快照，最新内容请访问源码仓库。
A flutter widget that calculates the size of it's child in runtime.
MeasuredSize Calculated the size of it's child in runtime. All you have to do is to wrap your widget with MeasuredSize and listen to size changes.
Complete example
MeasuredSize(
onChange: (Size size) {
setState(() {
print(size);
});
},
child: Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
);
onChange will be called when the [Size] changes.
onChange will return the value ONLY once if it didn't change, and
it will NOT return a value if it's equals to Size.zero
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