Cocoa：如何防止鼠标移过坐标？

Question

Final goal is to prevent mouse move to another screen (dual display setup) unless a hotkey is held.

The best I came up with, is this:

[NSEvent addGlobalMonitorForEventsMatchingMask:NSMouseMovedMask handler:^(NSEvent *mouseMovedEvent) {
   // does nothing yet
}]

The reason I went for global monitor is that my app does not have any windows (and views), it's a status bar app. So NSTrackingArea went home.

Any help would be much appreciated. In Java world, I would simply preventDefault() the event object. Now I need to get the same functionality in Objective-C. Ideally, I'd wish there would be "MouseMovedPastScreen" event, but apparently there's not.

Thanks.

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EDIT

Again, in Java, I would get the bounds of both screens, and stopped mouse at the corner positions. And then would allow the event to bubble if the ⌘ key has been held during the event execution.

Answer 1

Controlling the mouse cursor From the Quartz Display Services programming guide. Particularly

CGAssociateMouseAndMouseCursorPosition (false);