检测活动nsdocument的焦点/未焦点

似乎nsdocument被设置为所有文档窗口的委托,因此,我的nsdocument子类中所需的挂钩为:

- (void) windowDidBecomeMain: (NSNotification *) notification
{
    NSLog(@"windowDidBecomeMain:");     
}


- (void) windowDidResignMain: (NSNotification *) notification
{
    NSLog(@"windowWillResign:");        
}


- (void) windowWillClose: (NSNotification *) notification
{
    NSLog(@"windowWillClose:");
}