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Native Animated - Support decay on iOS

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Summary:
This is one of the last feature that is missing from native animated, it was already supported on Android and this implementation is based on it.

**Test plan**
Test that the existing decay animation example now works on iOS
Run unit tests
Closes https://github.com/facebook/react-native/pull/13368

Differential Revision: D4938061

Pulled By: javache

fbshipit-source-id: 36b57b1029a542e9daf21e048a06d3b3347e9659
This commit is contained in:
Janic Duplessis
2017-04-24 04:27:37 -07:00
committed by Facebook Github Bot
parent f1d5fdd468
commit 6c434f9404
7 changed files with 258 additions and 5 deletions
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8
Libraries/NativeAnimation/Drivers/RCTFrameAnimation.m
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@@ -17,8 +17,6 @@
#import "RCTAnimationUtils.h"
#import "RCTValueAnimatedNode.h"
const double SINGLE_FRAME_INTERVAL = 1.0 / 60.0;
@interface RCTFrameAnimation ()
@property (nonatomic, strong) NSNumber *animationId;
@@ -91,7 +89,7 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
// Determine how many frames have passed since last update.
// Get index of frames that surround the current interval
NSUInteger startIndex = floor(currentDuration / SINGLE_FRAME_INTERVAL);
NSUInteger startIndex = floor(currentDuration / RCTSingleFrameInterval);
NSUInteger nextIndex = startIndex + 1;
if (nextIndex >= _frames.count) {
@@ -106,8 +104,8 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
// Do a linear remap of the two frames to safegaurd against variable framerates
NSNumber *fromFrameValue = _frames[startIndex];
NSNumber *toFrameValue = _frames[nextIndex];
NSTimeInterval fromInterval = startIndex * SINGLE_FRAME_INTERVAL;
NSTimeInterval toInterval = nextIndex * SINGLE_FRAME_INTERVAL;
NSTimeInterval fromInterval = startIndex * RCTSingleFrameInterval;
NSTimeInterval toInterval = nextIndex * RCTSingleFrameInterval;
// Interpolate between the individual frames to ensure the animations are
//smooth and of the proper duration regardless of the framerate.