94 lines
2.6 KiB
Objective-C
94 lines
2.6 KiB
Objective-C
//
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// RNRootViewGestureRecognizer.m
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// RNGestureHandler
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//
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// Created by Krzysztof Magiera on 12/10/2017.
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// Copyright © 2017 Software Mansion. All rights reserved.
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//
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#import "RNRootViewGestureRecognizer.h"
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#import <UIKit/UIGestureRecognizerSubclass.h>
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#import <React/RCTTouchHandler.h>
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@implementation RNRootViewGestureRecognizer
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{
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BOOL _active;
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}
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@dynamic delegate;
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- (instancetype)init
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{
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if (self = [super init]) {
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self.delaysTouchesEnded = NO;
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self.delaysTouchesBegan = NO;
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}
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return self;
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}
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- (BOOL)shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
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{
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// This method is used to implement "enabled" feature for gesture handlers. We enforce gesture
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// recognizers that are connected with "disabled" handlers to wait for the root gesture
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// recognizer to fail and this way we block them from acting.
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RNGestureHandler *otherHandler = [RNGestureHandler
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findGestureHandlerByRecognizer:otherGestureRecognizer];
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if (otherHandler != nil && otherHandler.enabled == NO) {
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return YES;
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}
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return NO;
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}
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- (BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer
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{
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return ![preventedGestureRecognizer isKindOfClass:[RCTTouchHandler class]];
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}
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- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventingGestureRecognizer
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{
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// When this method is called it means that one of handlers has activated, in this case we want
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// to send an info to JS so that it cancells all JS responders
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[self.delegate gestureRecognizer:preventingGestureRecognizer didActivateInRootView:self.view];
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return [super canBePreventedByGestureRecognizer:preventingGestureRecognizer];
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}
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- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
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{
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_active = YES;
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self.state = UIGestureRecognizerStatePossible;
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}
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- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
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{
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self.state = UIGestureRecognizerStatePossible;
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}
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- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
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{
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if (self.state == UIGestureRecognizerStateBegan || self.state == UIGestureRecognizerStateChanged) {
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self.state = UIGestureRecognizerStateEnded;
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} else {
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self.state = UIGestureRecognizerStateFailed;
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}
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[self reset];
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_active = NO;
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}
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- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
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{
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self.state = UIGestureRecognizerStateCancelled;
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[self reset];
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_active = NO;
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}
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- (void)blockOtherRecognizers
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{
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if (_active) {
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self.state = UIGestureRecognizerStateBegan;
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}
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}
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@end
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