Support for getBBox?

Loving react-native-svg - thanks so much!

I am porting some code to React-Native that I originally wrote for the browser using React.js and SVG. Everything is working great so far, but I’ve run into a problem - I need to calculate the bounding box of various SVG groups (<g> elements).

To obtain the bounding box of a <g> element in a browser, it is enough to use a ref to get a callback with the mounted element, then invoke the SVG spec’s getBBox method on it, e.g.:

<g ref={(el)=>{console.log(el.getBBox())}}>
  <circle cx={100} cy={100} r={50}/>
  <circle cx={120} cy={80} r={60}/>
</g>

As far as I can tell there isn’t currently any support for getBBox in react-native-svg, so …

1. Are there any plans to introduce this support? (if so, is there a rough timeline?)
2. Is there a good alternative way to calculate the bounding box, taking into account transformations and such?

[msand]

You can also use UIManager.measure, closing now.

[maxkomarychev]

I added support for onLayout in this PR https://github.com/react-native-community/react-native-svg/pull/651