133 lines
3.7 KiB
Objective-C
133 lines
3.7 KiB
Objective-C
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import "OWSAnyTouchGestureRecognizer.h"
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#import <UIKit/UIGestureRecognizerSubclass.h>
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NS_ASSUME_NONNULL_BEGIN
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NSString *NSStringForUIGestureRecognizerState(UIGestureRecognizerState state)
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{
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switch (state) {
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case UIGestureRecognizerStatePossible:
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return @"UIGestureRecognizerStatePossible";
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case UIGestureRecognizerStateBegan:
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return @"UIGestureRecognizerStateBegan";
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case UIGestureRecognizerStateChanged:
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return @"UIGestureRecognizerStateChanged";
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case UIGestureRecognizerStateEnded:
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return @"UIGestureRecognizerStateEnded";
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case UIGestureRecognizerStateCancelled:
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return @"UIGestureRecognizerStateCancelled";
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case UIGestureRecognizerStateFailed:
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return @"UIGestureRecognizerStateFailed";
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}
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}
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@implementation OWSAnyTouchGestureRecognizer
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- (BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer
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{
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return NO;
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}
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- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer
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{
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return NO;
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}
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- (BOOL)shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
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{
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return NO;
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}
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- (BOOL)shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
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{
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return YES;
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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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if (self.state == UIGestureRecognizerStatePossible && [self isValidTouch:touches event:event]) {
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self.state = UIGestureRecognizerStateRecognized;
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} else {
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self.state = UIGestureRecognizerStateFailed;
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}
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}
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- (UIView *)rootViewInViewHierarchy:(UIView *)view
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{
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OWSAssertDebug(view);
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UIResponder *responder = view;
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UIView *lastView = nil;
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while (responder) {
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if ([responder isKindOfClass:[UIView class]]) {
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lastView = (UIView *)responder;
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}
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responder = [responder nextResponder];
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}
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return lastView;
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}
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- (BOOL)isValidTouch:(NSSet<UITouch *> *)touches event:(UIEvent *)event
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{
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if (event.allTouches.count > 1) {
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return NO;
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}
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if (touches.count != 1) {
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return NO;
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}
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UITouch *touch = touches.anyObject;
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CGPoint location = [touch locationInView:self.view];
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if (!CGRectContainsPoint(self.view.bounds, location)) {
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return NO;
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}
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if ([self subviewControlOfView:self.view containsTouch:touch]) {
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return NO;
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}
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// Ignore touches that start near the top or bottom edge of the screen;
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// they may be a system edge swipe gesture.
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UIView *rootView = [self rootViewInViewHierarchy:self.view];
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CGPoint rootLocation = [touch locationInView:rootView];
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CGFloat distanceToTopEdge = MAX(0, rootLocation.y);
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CGFloat distanceToBottomEdge = MAX(0, rootView.bounds.size.height - rootLocation.y);
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CGFloat distanceToNearestEdge = MIN(distanceToTopEdge, distanceToBottomEdge);
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CGFloat kSystemEdgeSwipeTolerance = 50.f;
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if (distanceToNearestEdge < kSystemEdgeSwipeTolerance) {
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return NO;
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}
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return YES;
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}
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- (BOOL)subviewControlOfView:(UIView *)superview containsTouch:(UITouch *)touch
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{
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for (UIView *subview in superview.subviews) {
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if (subview.hidden || !subview.userInteractionEnabled) {
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continue;
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}
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CGPoint location = [touch locationInView:subview];
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if (!CGRectContainsPoint(subview.bounds, location)) {
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continue;
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}
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if ([subview isKindOfClass:[UIControl class]]) {
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return YES;
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}
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if ([self subviewControlOfView:subview containsTouch:touch]) {
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return YES;
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}
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}
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return NO;
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}
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@end
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NS_ASSUME_NONNULL_END
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