TargetMouseScroll.m

   1 //
   2 //  TargetMouseScroll.m
   3 //  Enjoy
   4 //
   5 //  Created by Yifeng Huang on 7/28/12.
   6 //
   7
   8 #import "TargetMouseScroll.h"
   9
  10 @implementation TargetMouseScroll {
  11     int sign;
  12 }
  13
  14 + (NSString *)serializationCode {
  15     return @"mscroll";
  16 }
  17
  18 - (NSDictionary *)serialize {
  19     return @{ @"type": @"mscroll", @"amount": @(_amount) };
  20 }
  21
  22 + (Target *)targetDeserialize:(NSDictionary *)serialization
  23                   withConfigs:(NSArray *)configs {
  24         TargetMouseScroll *target = [[TargetMouseScroll alloc] init];
  25     target.amount = [serialization[@"amount"] intValue];
  26         return target;
  27 }
  28
  29 - (void)trigger {
  30     if (!self.magnitude) {
  31         CGEventRef scroll = CGEventCreateScrollWheelEvent(NULL,
  32                                                           kCGScrollEventUnitLine,
  33                                                           1,
  34                                                           _amount);
  35         CGEventPost(kCGHIDEventTap, scroll);
  36         CFRelease(scroll);
  37     }
  38 }
  39
  40 - (BOOL)update:(NJInputController *)jc {
  41     if (fabsf(self.magnitude) < 0.01f) {
  42         sign = 0;
  43         return NO; // dead zone
  44     }
  45
  46     // If the input crossed over High/Low, this target is done.
  47     if (!sign)
  48         sign = self.magnitude < 0 ? -1 : 1;
  49     else if (sign / self.magnitude < 0) {
  50         sign = 0;
  51         return NO;
  52     }
  53
  54     int amount = (int)(16.f * fabsf(self.magnitude) * _amount);
  55     CGEventRef scroll = CGEventCreateScrollWheelEvent(NULL,
  56                                                       kCGScrollEventUnitPixel,
  57                                                       1,
  58                                                       amount);
  59     CGEventPost(kCGHIDEventTap, scroll);
  60     CFRelease(scroll);
  61
  62     return YES;
  63 }
  64
  65 - (BOOL)isContinuous {
  66     return YES;
  67 }
  68
  69 @end