Register a global hotkey

Build DDHotKey as a static library so we can compile it with ARC turned
on and our project with ARC turned off. Since DDHotKey is written with
ARC, if I include its headers directly, I'd need to enable ARC on my
project in order to compile it.

Initialise an `NSApplication` to give us an environment in which to
register the global hotkey.

A new class `Invert` will respond to the hotkey and respond accordingly.

1 files changed, 7 insertions, 0 deletions

diff --git a/Invert.h b/Invert.h
new file mode 100644
index 0000000..c84685e
--- /dev/null
+++ b/Invert.h
@@ -0,0 +1,7 @@
+#import <Cocoa/Cocoa.h>
+
+@interface Invert : NSObject
+
+- (void)toggleInvertColors:(NSEvent *)event;
+
+@end