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2021-04-02 02:24:13 +03:00
#import "RNForceTouchHandler.h"
#import <UIKit/UIGestureRecognizerSubclass.h>
#import <React/RCTConvert.h>
@interface RNForceTouchGestureRecognizer : UIGestureRecognizer
@property (nonatomic) CGFloat maxForce;
@property (nonatomic) CGFloat minForce;
@property (nonatomic) CGFloat force;
@property (nonatomic) BOOL feedbackOnActivation;
- (id)initWithGestureHandler:(RNGestureHandler*)gestureHandler;
@end
@implementation RNForceTouchGestureRecognizer {
__weak RNGestureHandler *_gestureHandler;
UITouch *_firstTouch;
}
- (id)initWithGestureHandler:(RNGestureHandler*)gestureHandler
{
if ((self = [super initWithTarget:gestureHandler action:@selector(handleGesture:)])) {
_gestureHandler = gestureHandler;
_force = 0;
_minForce = 0.2;
_maxForce = NAN;
_feedbackOnActivation = NO;
}
return self;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (_firstTouch) {
// ignore rest of fingers
return;
}
[super touchesBegan:touches withEvent:event];
_firstTouch = [touches anyObject];
[self handleForceWithTouches:touches];
self.state = UIGestureRecognizerStatePossible;
}
- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (![touches containsObject:_firstTouch]) {
// Considered only the very first touch
return;
}
[super touchesMoved:touches withEvent:event];
[self handleForceWithTouches:touches];
if ([self shouldFail]) {
self.state = UIGestureRecognizerStateFailed;
return;
}
if (self.state == UIGestureRecognizerStatePossible && [self shouldActivate]) {
[self performFeedbackIfRequired];
self.state = UIGestureRecognizerStateBegan;
}
}
- (BOOL)shouldActivate {
return (_force >= _minForce);
}
- (BOOL)shouldFail {
return TEST_MAX_IF_NOT_NAN(_force, _maxForce);
}
- (void)performFeedbackIfRequired
{
#if !TARGET_OS_TV
if (_feedbackOnActivation) {
if (@available(iOS 10.0, *)) {
[[[UIImpactFeedbackGenerator alloc] initWithStyle:(UIImpactFeedbackStyleMedium)] impactOccurred];
}
}
#endif
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (![touches containsObject:_firstTouch]) {
// Considered only the very first touch
return;
}
[super touchesEnded:touches withEvent:event];
if (self.state == UIGestureRecognizerStateBegan || self.state == UIGestureRecognizerStateChanged) {
self.state = UIGestureRecognizerStateEnded;
} else {
self.state = UIGestureRecognizerStateFailed;
}
}
- (void)handleForceWithTouches:(NSSet<UITouch *> *)touches {
_force = _firstTouch.force / _firstTouch.maximumPossibleForce;
}
- (void)reset {
[super reset];
_force = 0;
_firstTouch = NULL;
}
@end
@implementation RNForceTouchHandler
- (instancetype)initWithTag:(NSNumber *)tag
{
if ((self = [super initWithTag:tag])) {
_recognizer = [[RNForceTouchGestureRecognizer alloc] initWithGestureHandler:self];
}
return self;
}
- (void)configure:(NSDictionary *)config
{
[super configure:config];
RNForceTouchGestureRecognizer *recognizer = (RNForceTouchGestureRecognizer *)_recognizer;
APPLY_FLOAT_PROP(maxForce);
APPLY_FLOAT_PROP(minForce);
id prop = config[@"feedbackOnActivation"];
if (prop != nil) {
recognizer.feedbackOnActivation = [RCTConvert BOOL:prop];
}
}
- (RNGestureHandlerEventExtraData *)eventExtraData:(RNForceTouchGestureRecognizer *)recognizer
{
return [RNGestureHandlerEventExtraData
forForce: recognizer.force
forPosition:[recognizer locationInView:recognizer.view]
withAbsolutePosition:[recognizer locationInView:recognizer.view.window]
withNumberOfTouches:recognizer.numberOfTouches];
}
@end