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//
// SDLTouchManager.m
// SmartDeviceLink-iOS
//
// Created by Muller, Alexander (A.) on 6/14/16.
// Copyright © 2016 smartdevicelink. All rights reserved.
//
#import "SDLTouchManager.h"
#import "CGPoint_Util.h"
#import "dispatch_timer.h"
#import "SDLDebugTool.h"
#import "SDLOnTouchEvent.h"
#import "SDLPinchGesture.h"
#import "SDLTouch.h"
#import "SDLTouchCoord.h"
#import "SDLTouchEvent.h"
#import "SDLTouchType.h"
NS_ASSUME_NONNULL_BEGIN
typedef NS_ENUM(NSUInteger, SDLPerformingTouchType) {
SDLPerformingTouchTypeNone,
SDLPerformingTouchTypeSingleTouch,
SDLPerformingTouchTypeMultiTouch,
SDLPerformingTouchTypePanningTouch
};
/*!
* @abstract
* Touch Manager will ignore touches that represent more than 2 fingers on the screen.
*/
static NSUInteger const MaximumNumberOfTouches = 2;
@interface SDLTouchManager ()
/*!
* @abstract
* First Touch received from onOnTouchEvent.
*/
@property (nonatomic, strong, nullable) SDLTouch *previousTouch;
/*!
* @abstract
* Cached previous single tap used for double tap detection.
*/
@property (nonatomic, strong, nullable) SDLTouch *singleTapTouch;
/*!
* @abstract
* Distance of a previously generated pinch event. Used to calculate the scale of zoom motion.
*/
@property (nonatomic, assign) CGFloat previousPinchDistance;
/*!
* @abstract
* Current in-progress pinch gesture.
*/
@property (nonatomic, strong, nullable) SDLPinchGesture *currentPinchGesture;
/*!
* @abstract
* Timer used for distinguishing between single & double taps.
*/
@property (nonatomic, strong, nullable) dispatch_source_t singleTapTimer;
/*!
* @abstract
* Current touch type being performed.
*/
@property (nonatomic, assign) SDLPerformingTouchType performingTouchType;
@end
@implementation SDLTouchManager
- (instancetype)init {
self = [super init];
if (!self) {
return nil;
}
_movementTimeThreshold = 0.05f;
_tapTimeThreshold = 0.4f;
_tapDistanceThreshold = 50.0f;
_touchEnabled = YES;
return self;
}
#pragma mark - Public
- (void)cancelPendingTouches {
[self sdl_cancelSingleTapTimer];
}
#pragma mark - SDLProxyListener Delegate
- (void)onProxyOpened {
}
- (void)onProxyClosed {
}
- (void)onOnHMIStatus:(SDLOnHMIStatus *)notification {
}
- (void)onOnDriverDistraction:(SDLOnDriverDistraction *)notification {
}
- (void)onOnTouchEvent:(SDLOnTouchEvent *)notification {
if (!self.isTouchEnabled) {
return;
}
SDLTouchEvent *touchEvent = notification.event.firstObject;
SDLTouch *touch = [[SDLTouch alloc] initWithTouchEvent:touchEvent];
if (touch.identifier > MaximumNumberOfTouches) {
return;
}
if ([notification.type isEqualToString:SDLTouchTypeBegin]) {
[self sdl_handleTouchBegan:touch];
} else if ([notification.type isEqualToString:SDLTouchTypeMove]) {
[self sdl_handleTouchMoved:touch];
} else if ([notification.type isEqualToString:SDLTouchTypeEnd]) {
[self sdl_handleTouchEnded:touch];
}
}
#pragma mark - Private
- (void)sdl_handleTouchBegan:(SDLTouch *)touch {
if (!touch.isFirstFinger && !self.isTouchEnabled) {
return; // no-op
}
_performingTouchType = SDLPerformingTouchTypeSingleTouch;
switch (touch.identifier) {
case SDLTouchIdentifierFirstFinger:
self.previousTouch = touch;
break;
case SDLTouchIdentifierSecondFinger:
_performingTouchType = SDLPerformingTouchTypeMultiTouch;
self.currentPinchGesture = [[SDLPinchGesture alloc] initWithFirstTouch:self.previousTouch
secondTouch:touch];
self.previousPinchDistance = self.currentPinchGesture.distance;
if ([self.touchEventDelegate respondsToSelector:@selector(touchManager:pinchDidStartAtCenterPoint:)]) {
[self.touchEventDelegate touchManager:self
pinchDidStartAtCenterPoint:self.currentPinchGesture.center];
}
break;
}
}
- (void)sdl_handleTouchMoved:(SDLTouch *)touch {
if ((touch.timeStamp - self.previousTouch.timeStamp) <= (self.movementTimeThreshold * NSEC_PER_USEC) || !self.isTouchEnabled) {
return; // no-op
}
switch (self.performingTouchType) {
case SDLPerformingTouchTypeMultiTouch:
switch (touch.identifier) {
case SDLTouchIdentifierFirstFinger:
self.currentPinchGesture.firstTouch = touch;
break;
case SDLTouchIdentifierSecondFinger:
self.currentPinchGesture.secondTouch = touch;
break;
}
if ([self.touchEventDelegate respondsToSelector:@selector(touchManager:didReceivePinchAtCenterPoint:withScale:)]) {
CGFloat scale = self.currentPinchGesture.distance / self.previousPinchDistance;
[self.touchEventDelegate touchManager:self
didReceivePinchAtCenterPoint:self.currentPinchGesture.center
withScale:scale];
}
self.previousPinchDistance = self.currentPinchGesture.distance;
break;
case SDLPerformingTouchTypeSingleTouch:
_performingTouchType = SDLPerformingTouchTypePanningTouch;
if ([self.touchEventDelegate respondsToSelector:@selector(touchManager:panningDidStartAtPoint:)]) {
[self.touchEventDelegate touchManager:self
panningDidStartAtPoint:touch.location];
}
break;
case SDLPerformingTouchTypePanningTouch:
if ([self.touchEventDelegate respondsToSelector:@selector(touchManager:didReceivePanningFromPoint:toPoint:)]) {
[self.touchEventDelegate touchManager:self
didReceivePanningFromPoint:self.previousTouch.location
toPoint:touch.location];
}
break;
case SDLPerformingTouchTypeNone:
break;
}
self.previousTouch = touch;
}
- (void)sdl_handleTouchEnded:(SDLTouch *)touch {
if (!self.isTouchEnabled) {
return; // no-op
}
switch (self.performingTouchType) {
case SDLPerformingTouchTypeMultiTouch:
switch (touch.identifier) {
case SDLTouchIdentifierFirstFinger:
self.currentPinchGesture.firstTouch = touch;
break;
case SDLTouchIdentifierSecondFinger:
self.currentPinchGesture.secondTouch = touch;
break;
}
if (self.currentPinchGesture.isValid) {
if ([self.touchEventDelegate respondsToSelector:@selector(touchManager:pinchDidEndAtCenterPoint:)]) {
[self.touchEventDelegate touchManager:self
pinchDidEndAtCenterPoint:self.currentPinchGesture.center];
}
self.currentPinchGesture = nil;
}
break;
case SDLPerformingTouchTypePanningTouch:
if ([self.touchEventDelegate respondsToSelector:@selector(touchManager:panningDidEndAtPoint:)]) {
[self.touchEventDelegate touchManager:self
panningDidEndAtPoint:touch.location];
}
break;
case SDLPerformingTouchTypeSingleTouch:
if (self.singleTapTimer == nil) { // Initial Tap
self.singleTapTouch = touch;
[self sdl_initializeSingleTapTimerAtPoint:self.singleTapTouch.location];
} else { // Double Tap
[self sdl_cancelSingleTapTimer];
NSUInteger timeStampDelta = touch.timeStamp - self.singleTapTouch.timeStamp;
CGFloat xDelta = fabs(touch.location.x - self.singleTapTouch.location.x);
CGFloat yDelta = fabs(touch.location.y - self.singleTapTouch.location.y);
if (timeStampDelta <= self.tapTimeThreshold * NSEC_PER_USEC && xDelta <= self.tapDistanceThreshold && yDelta <= self.tapDistanceThreshold) {
CGPoint centerPoint = CGPointCenterOfPoints(touch.location,
self.singleTapTouch.location);
if ([self.touchEventDelegate respondsToSelector:@selector(touchManager:didReceiveDoubleTapAtPoint:)]) {
[self.touchEventDelegate touchManager:self
didReceiveDoubleTapAtPoint:centerPoint];
}
}
self.singleTapTouch = nil;
}
break;
case SDLPerformingTouchTypeNone:
break;
}
self.previousTouch = nil;
_performingTouchType = SDLPerformingTouchTypeNone;
}
- (void)sdl_initializeSingleTapTimerAtPoint:(CGPoint)point {
__weak typeof(self) weakSelf = self;
self.singleTapTimer = dispatch_create_timer(self.tapTimeThreshold, NO, ^{
typeof(weakSelf) strongSelf = weakSelf;
strongSelf.singleTapTouch = nil;
[strongSelf sdl_cancelSingleTapTimer];
if ([strongSelf.touchEventDelegate respondsToSelector:@selector(touchManager:didReceiveSingleTapAtPoint:)]) {
[strongSelf.touchEventDelegate touchManager:strongSelf
didReceiveSingleTapAtPoint:point];
}
});
}
- (void)sdl_cancelSingleTapTimer {
if (self.singleTapTimer == NULL) {
return;
}
dispatch_stop_timer(self.singleTapTimer);
self.singleTapTimer = NULL;
}
@end
NS_ASSUME_NONNULL_END
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