1 files changed, 132 insertions, 0 deletions
diff --git a/prev/events_darwin.go b/prev/events_darwin.go
new file mode 100644
index 0000000..d9cbe0c
--- /dev/null
+++ b/prev/events_darwin.go
@@ -0,0 +1,132 @@
+// 30 march 2014
+
+package ui
+
+/*
+Mac OS X uses its own set of hardware key codes that are different from PC keyboard scancodes, but are positional (like PC keyboard scancodes). These are defined in <HIToolbox/Events.h>, a Carbon header. As far as I can tell, there's no way to include this header without either using an absolute path or linking Carbon into the program, so the constant values are used here instead.
+
+The Cocoa docs do guarantee that -[NSEvent keyCode] results in key codes that are the same as those returned by Carbon; that is, these codes.
+*/
+
+// use uintptr to be safe
+var keycodeKeys = map[uintptr]byte{
+	0x00: 'a',
+	0x01: 's',
+	0x02: 'd',
+	0x03: 'f',
+	0x04: 'h',
+	0x05: 'g',
+	0x06: 'z',
+	0x07: 'x',
+	0x08: 'c',
+	0x09: 'v',
+	0x0B: 'b',
+	0x0C: 'q',
+	0x0D: 'w',
+	0x0E: 'e',
+	0x0F: 'r',
+	0x10: 'y',
+	0x11: 't',
+	0x12: '1',
+	0x13: '2',
+	0x14: '3',
+	0x15: '4',
+	0x16: '6',
+	0x17: '5',
+	0x18: '=',
+	0x19: '9',
+	0x1A: '7',
+	0x1B: '-',
+	0x1C: '8',
+	0x1D: '0',
+	0x1E: ']',
+	0x1F: 'o',
+	0x20: 'u',
+	0x21: '[',
+	0x22: 'i',
+	0x23: 'p',
+	0x25: 'l',
+	0x26: 'j',
+	0x27: '\'',
+	0x28: 'k',
+	0x29: ';',
+	0x2A: '\\',
+	0x2B: ',',
+	0x2C: '/',
+	0x2D: 'n',
+	0x2E: 'm',
+	0x2F: '.',
+	0x32: '`',
+	0x24: '\n',
+	0x30: '\t',
+	0x31: ' ',
+	0x33: '\b',
+}
+
+var keycodeExtKeys = map[uintptr]ExtKey{
+	0x41: NDot,
+	0x43: NMultiply,
+	0x45: NAdd,
+	0x4B: NDivide,
+	0x4C: NEnter,
+	0x4E: NSubtract,
+	0x52: N0,
+	0x53: N1,
+	0x54: N2,
+	0x55: N3,
+	0x56: N4,
+	0x57: N5,
+	0x58: N6,
+	0x59: N7,
+	0x5B: N8,
+	0x5C: N9,
+	0x35: Escape,
+	0x60: F5,
+	0x61: F6,
+	0x62: F7,
+	0x63: F3,
+	0x64: F8,
+	0x65: F9,
+	0x67: F11,
+	0x6D: F10,
+	0x6F: F12,
+	0x72: Insert, // listed as the Help key but it's in the same position on an Apple keyboard as the Insert key on a Windows keyboard; thanks to SeanieB from irc.badnik.net and Psy in irc.freenode.net/#macdev for confirming they have the same code
+	0x73: Home,
+	0x74: PageUp,
+	0x75: Delete,
+	0x76: F4,
+	0x77: End,
+	0x78: F2,
+	0x79: PageDown,
+	0x7A: F1,
+	0x7B: Left,
+	0x7C: Right,
+	0x7D: Down,
+	0x7E: Up,
+}
+
+var keycodeModifiers = map[uintptr]Modifiers{
+	0x37: Super, // left command
+	0x38: Shift, // left shift
+	0x3A: Alt,   // left option
+	0x3B: Ctrl,  // left control
+	0x3C: Shift, // right shift
+	0x3D: Alt,   // right alt
+	0x3E: Ctrl,  // right control
+
+	// the following is not in Events.h for some reason
+	// thanks to Nicole and jedivulcan from irc.badnik.net
+	0x36: Super, // right command
+}
+
+func fromKeycode(keycode uintptr) (ke KeyEvent, ok bool) {
+	if key, ok := keycodeKeys[keycode]; ok {
+		ke.Key = key
+		return ke, true
+	}
+	if extkey, ok := keycodeExtKeys[keycode]; ok {
+		ke.ExtKey = extkey
+		return ke, true
+	}
+	return ke, false
+}