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    <p>As noted by valexa, using NSEventMask for CGEventTap is a hack. Tarmes also notes that Rob Keniger's answer no longer works (OS X >= 10.8). Luckily, Apple has provided a way to do this quite easily by using <code>kCGEventMaskForAllEvents</code> and converting the CGEventRef to an NSEvent within the callback:</p> <pre><code>NSEventMask eventMask = NSEventMaskGesture|NSEventMaskMagnify|NSEventMaskSwipe|NSEventMaskRotate|NSEventMaskBeginGesture|NSEventMaskEndGesture; CGEventRef eventTapCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef eventRef, void *refcon) { // convert the CGEventRef to an NSEvent NSEvent *event = [NSEvent eventWithCGEvent:eventRef]; // filter out events which do not match the mask if (!(eventMask &amp; NSEventMaskFromType([event type]))) { return [event CGEvent]; } // do stuff NSLog(@"eventTapCallback: [event type] = %d", [event type]); // return the CGEventRef return [event CGEvent]; } void initCGEventTap() { CFMachPortRef eventTap = CGEventTapCreate(kCGSessionEventTap, kCGHeadInsertEventTap, kCGEventTapOptionListenOnly, kCGEventMaskForAllEvents, eventTapCallback, nil); CFRunLoopAddSource(CFRunLoopGetCurrent(), CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0), kCFRunLoopCommonModes); CGEventTapEnable(eventTap, true); CFRunLoopRun(); } </code></pre> <p>Note that the call to <code>CFRunLoopRun()</code> is included since this snippet was taken from a project which could not use NSApplication but instead had a bare-bones CFRunLoop. Omit it if you use NSApplication.</p>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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