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Add extractOffset to Animated

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Summary:
`flattenOffset` has proven extremely useful, especially when dealing with pan responders and other gesture based animations, but I've also found a number of use cases for the inverse. This diff introduces `extractOffset`, which sets the offset value to the base value, and resets the base value to zero. A common use case would be to extractOffset onGrant and flattenOffset onRelease.
Closes https://github.com/facebook/react-native/pull/10721

Differential Revision: D4145744

fbshipit-source-id: dc2aa31652df0b31450556f611db43548180c7dd
This commit is contained in:
Ryan Gomba
2016-11-07 20:36:52 -08:00
committed by Facebook Github Bot
parent bf2b435322
commit 6535858c71
8 changed files with 59 additions and 0 deletions
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12
Libraries/Animated/src/AnimatedImplementation.js
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@@ -763,6 +763,18 @@ class AnimatedValue extends AnimatedWithChildren {
}
}
/**
* Sets the offset value to the base value, and resets the base value to zero.
* The final output of the value is unchanged.
*/
extractOffset(): void {
this._offset += this._value;
this._value = 0;
if (this.__isNative) {
NativeAnimatedAPI.extractAnimatedNodeOffset(this.__getNativeTag());
}
}
/**
* Adds an asynchronous listener to the value so you can observe updates from
* animations. This is useful because there is no way to