implement SonarPen

libs/libSonarPen/include/WTSonarPenTouchesHandler.h

@@ -0,0 +1,28 @@
+//
+//  WTSonarPenTouchesHandler.h
+//
+//  Created by Water Lou on 3/7/15.
+//  Copyright (c) 2015 First Water Tech Ltd. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface WTSonarPenTouchesHandler : NSObject
+
+- (void)handleTouches:(UIEvent * _Nullable)event
+                 view:(UIView * _Nonnull)view
+              penDown:(BOOL)penDownStatus;
+
+// check if pen is down
+- (BOOL)isPenDown;
+// check if touch with large size touch
+- (BOOL)isPalmTouchedBySize;
+
+// get pen location if pen is down
+- (CGPoint)penLocation;
+// touch object that detect as pen
+@property(readonly, nullable) UITouch *penTouch;
+
+- (NSInteger)numberOfTouches;
+
+@end