Classes/NJInputHat.m

   1 //
   2 //  NJInputHat.m
   3 //  Enjoy
   4 //
   5 //  Created by Sam McCall on 5/05/09.
   6 //
   7
   8 #import "NJInputHat.h"
   9
  10 static BOOL active_eightway[36] = {
  11     NO,  NO,  NO,  NO , // center
  12     YES, NO,  NO,  NO , // N
  13     YES, NO,  NO,  YES, // NE
  14     NO,  NO,  NO,  YES, // E
  15     NO,  YES, NO,  YES, // SE
  16     NO,  YES, NO,  NO , // S
  17     NO,  YES, YES, NO , // SW
  18     NO,  NO,  YES, NO , // W
  19     YES, NO,  YES, NO , // NW
  20 };
  21
  22 static BOOL active_fourway[20] = {
  23     NO,  NO,  NO,  NO , // center
  24     YES, NO,  NO,  NO , // N
  25     NO,  NO,  NO,  YES, // E
  26     NO,  YES, NO,  NO , // S
  27     NO,  NO,  YES, NO , // W
  28 };
  29
  30 @implementation NJInputHat
  31
  32 - (id)initWithIndex:(int)index {
  33     if ((self = [super init])) {
  34         self.children = @[[[NJInput alloc] initWithName:@"Up" base:self],
  35                           [[NJInput alloc] initWithName:@"Down" base:self],
  36                           [[NJInput alloc] initWithName:@"Left" base:self],
  37                           [[NJInput alloc] initWithName:@"Right" base:self]];
  38         self.name = [NSString stringWithFormat:@"Hat Switch %d", index];
  39     }
  40     return self;
  41 }
  42
  43 - (id)findSubInputForValue:(IOHIDValueRef)value {
  44     long parsed = IOHIDValueGetIntegerValue(value);
  45     switch (IOHIDElementGetLogicalMax(IOHIDValueGetElement(value))) {
  46         case 7: // 8-way switch, 0-7.
  47             switch (parsed) {
  48                 case 0: return self.children[0];
  49                 case 4: return self.children[1];
  50                 case 6: return self.children[2];
  51                 case 2: return self.children[3];
  52                 default: return nil;
  53             }
  54         case 8: // 8-way switch, 1-8 (neutral 0).
  55             switch (parsed) {
  56                 case 1: return self.children[0];
  57                 case 5: return self.children[1];
  58                 case 7: return self.children[2];
  59                 case 3: return self.children[3];
  60                 default: return nil;
  61             }
  62         case 3: // 4-way switch, 0-3.
  63             switch (parsed) {
  64                 case 0: return self.children[0];
  65                 case 2: return self.children[1];
  66                 case 3: return self.children[2];
  67                 case 1: return self.children[3];
  68                 default: return nil;
  69             }
  70         case 4: // 4-way switch, 1-4 (neutral 0).
  71             switch (parsed) {
  72                 case 1: return self.children[0];
  73                 case 3: return self.children[1];
  74                 case 4: return self.children[2];
  75                 case 2: return self.children[3];
  76                 default: return nil;
  77             }
  78         default:
  79             return nil;
  80     }
  81 }
  82
  83 - (void)notifyEvent:(IOHIDValueRef)value {
  84     long parsed = IOHIDValueGetIntegerValue(value);
  85     long size = IOHIDElementGetLogicalMax(IOHIDValueGetElement(value));
  86     // Skip first row in table if 0 is not neutral.
  87     if (size & 1) {
  88         parsed++;
  89         size++;
  90     }
  91     BOOL *activechildren = (size == 8) ? active_eightway : active_fourway;
  92     for (unsigned i = 0; i < 4; i++) {
  93         BOOL active = activechildren[parsed * 4 + i];
  94         [self.children[i] setActive:active];
  95         [self.children[i] setMagnitude:active];
  96     }
  97 }
  98
  99 @end