89 lines
2.7 KiB
Objective-C
89 lines
2.7 KiB
Objective-C
//
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// SCLongPressGestureRecognizer.m
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// SCCamera
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//
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// Created by Pavlo Antonenko on 4/28/15.
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// Copyright (c) 2015 Snapchat, Inc. All rights reserved.
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//
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#import "SCLongPressGestureRecognizer.h"
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#import <SCFoundation/SCLog.h>
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#import <UIKit/UIGestureRecognizerSubclass.h>
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@implementation SCLongPressGestureRecognizer {
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CGPoint _initialPoint;
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CGFloat _initialTime;
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}
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- (instancetype)initWithTarget:(id)target action:(SEL)action
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{
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self = [super initWithTarget:target action:action];
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if (self) {
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_allowableMovementAfterBegan = FLT_MAX;
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_timeBeforeUnlimitedMovementAllowed = 0.0;
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}
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return self;
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}
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- (void)reset
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{
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[super reset];
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_initialPoint = CGPointZero;
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_initialTime = 0;
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_forceOfAllTouches = 1.0;
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_maximumPossibleForceOfAllTouches = 1.0;
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self.failedByMovement = NO;
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}
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- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
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{
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[super touchesBegan:touches withEvent:event];
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_initialPoint = [self locationInView:self.view];
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_initialTime = CACurrentMediaTime();
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_forceOfAllTouches = 1.0;
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for (UITouch *touch in touches) {
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_maximumPossibleForceOfAllTouches = MAX(touch.maximumPossibleForce, _maximumPossibleForceOfAllTouches);
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_forceOfAllTouches = MAX(touch.force, _forceOfAllTouches);
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}
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}
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- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
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{
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[super touchesMoved:touches withEvent:event];
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_forceOfAllTouches = 1.0;
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for (UITouch *touch in touches) {
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_maximumPossibleForceOfAllTouches = MAX(touch.maximumPossibleForce, _maximumPossibleForceOfAllTouches);
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_forceOfAllTouches = MAX(touch.force, _forceOfAllTouches);
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}
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if (!CGPointEqualToPoint(_initialPoint, CGPointZero)) {
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CGPoint currentPoint = [self locationInView:self.view];
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CGFloat distance = hypot(_initialPoint.x - currentPoint.x, _initialPoint.y - currentPoint.y);
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CGFloat timeDifference = CACurrentMediaTime() - _initialTime;
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if (distance > self.allowableMovementAfterBegan && timeDifference < self.timeBeforeUnlimitedMovementAllowed) {
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SCLogGeneralInfo(@"Long press moved %.2f > %.2f after %.3f < %.3f seconds, and is cancelled", distance,
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self.allowableMovementAfterBegan, timeDifference, self.timeBeforeUnlimitedMovementAllowed);
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self.state = UIGestureRecognizerStateFailed;
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self.failedByMovement = YES;
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}
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}
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}
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- (void)setEnabled:(BOOL)enabled
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{
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SCLogGeneralInfo(@"Setting enabled: %d for %@", enabled, self);
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[super setEnabled:enabled];
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}
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- (BOOL)isUnlimitedMovementAllowed
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{
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return CACurrentMediaTime() - _initialTime > self.timeBeforeUnlimitedMovementAllowed;
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}
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@end
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