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e93d496f6d
Summary:
The `extractOffset` method is previously implemented on `Animated.Value`, along with `setOffset` and `flattenOffset`. Both of the latter methods are proxied on `Animated.ValueXY`, but `extractOffset` is not. This commit adds the missing method.
When creating draggable elements in XY space, in order to compensate for previous gestures' offsets, we currently need to do something like the following at the beginning or end of each gesture:
```
xy.setOffset(xy.__getValue());
xy.setValue({x: 0, y: 0});
```
After this commit, the API is equivalent to using a plain `Animated.Value`:
```
xy.extractOffset();
```
Closes https://github.com/facebook/react-native/pull/12193
Differential Revision: D4508717
Pulled By: mkonicek
fbshipit-source-id: 0976cf1ab68538e59023ffaa2539eb62779ad874