JSActionHat.m

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