Joystick.m

   1 //
   2 //  Joystick.m
   3 //  Enjoy
   4 //
   5 //  Created by Sam McCall on 4/05/09.
   6 //
   7
   8 @implementation Joystick {
   9         NSMutableArray *children;
  10 }
  11
  12 @synthesize     vendorId, productId, productName, index, device, children;
  13
  14 - (id)initWithDevice: (IOHIDDeviceRef) newDevice {
  15         if ((self = [super init])) {
  16                 children = [[NSMutableArray alloc] init];
  17
  18                 self.device = newDevice;
  19                 self.productName = (__bridge NSString *)IOHIDDeviceGetProperty(device, CFSTR(kIOHIDProductKey));
  20                 self.vendorId = [(__bridge NSNumber *)IOHIDDeviceGetProperty(device, CFSTR(kIOHIDVendorIDKey)) intValue];
  21                 self.productId = [(__bridge NSNumber *)IOHIDDeviceGetProperty(device, CFSTR(kIOHIDVendorIDKey)) intValue];
  22         }
  23         return self;
  24 }
  25
  26 - (NSString *)name {
  27         return [[NSString alloc] initWithFormat: @"%@ #%d", productName, index + 1];
  28 }
  29
  30 -(id) base {
  31         return NULL;
  32 }
  33
  34 -(void) populateActions {
  35         NSArray* elements = (NSArray*)CFBridgingRelease(IOHIDDeviceCopyMatchingElements(device, NULL, kIOHIDOptionsTypeNone));
  36
  37         int buttons = 0;
  38         int axes = 0;
  39
  40         for(int i=0; i<[elements count]; i++) {
  41                 IOHIDElementRef element = (__bridge IOHIDElementRef)elements[i];
  42                 int type = IOHIDElementGetType(element);
  43                 int usage = IOHIDElementGetUsage(element);
  44                 int usagePage = IOHIDElementGetUsagePage(element);
  45                 int max = IOHIDElementGetPhysicalMax(element);
  46                 int min = IOHIDElementGetPhysicalMin(element);
  47         CFStringRef elName = IOHIDElementGetName(element);
  48
  49 //              if(usagePage != 1 || usagePage == 9) {
  50 //                      NSLog(@"Skipping usage page %x usage %x", usagePage, usage);
  51 //                      continue;
  52 //              }
  53
  54                 JSAction* action = NULL;
  55
  56                 if(!(type == kIOHIDElementTypeInput_Misc || type == kIOHIDElementTypeInput_Axis ||
  57                          type == kIOHIDElementTypeInput_Button)) {
  58
  59                         continue;
  60                 }
  61
  62                 if((max - min == 1) || usagePage == kHIDPage_Button || type == kIOHIDElementTypeInput_Button) {
  63                         action = [[JSActionButton alloc] initWithIndex: buttons++ andName: (__bridge NSString *)elName];
  64                         [(JSActionButton*)action setMax: max];
  65                 } else if(usage == 0x39)
  66                         action = [[JSActionHat alloc] init];
  67                 else {
  68                         if(usage >= 0x30 && usage < 0x36) {
  69                                 action = [[JSActionAnalog alloc] initWithIndex: axes++];
  70                                 [(JSActionAnalog*)action setOffset: (double)-1.0];
  71                                 [(JSActionAnalog*)action setScale: (double)2.0/(max - min)];
  72                         } else
  73                                 continue;
  74                 }
  75
  76                 [action setBase: self];
  77                 [action setUsage: usage];
  78                 [action setCookie: IOHIDElementGetCookie(element)];
  79                 [children addObject:action];
  80         }
  81 }
  82
  83 -(NSString*) stringify {
  84         return [[NSString alloc] initWithFormat: @"%d~%d~%d", vendorId, productId, index];
  85 }
  86
  87 - (JSAction*) findActionByCookie: (void*) cookie {
  88         for(int i=0; i<[children count]; i++)
  89                 if([children[i]cookie] == cookie)
  90                         return (JSAction*)children[i];
  91         return NULL;
  92 }
  93
  94 -(id) handlerForEvent: (IOHIDValueRef) value {
  95         JSAction* mainAction = [self actionForEvent: value];
  96         if(!mainAction)
  97                 return NULL;
  98         return [mainAction findSubActionForValue: value];
  99 }
 100 -(JSAction*) actionForEvent: (IOHIDValueRef) value {
 101         IOHIDElementRef elt = IOHIDValueGetElement(value);
 102         void* cookie = IOHIDElementGetCookie(elt);
 103         return [self findActionByCookie: cookie];
 104 }
 105
 106 @end