DDHotKey - 跟踪而不取消事件

Question

我正在使用DDHotKey 来跟踪一些系统范围的键盘快捷键。当事件被触发时，只有我的应用程序才能交付它。是否可以在不阻止事件传递到其原始目标应用程序的情况下对其进行观察？

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这是该模块注册事件处理程序的方式：

InstallApplicationEventHandler(&dd_hotKeyHandler, 1, &eventSpec, NULL, NULL);

以及事件处理程序本身：

OSStatus dd_hotKeyHandler(EventHandlerCallRef nextHandler, EventRef theEvent, void *userData) {
    @autoreleasepool {
        EventHotKeyID hotKeyID;
        GetEventParameter(theEvent, kEventParamDirectObject, typeEventHotKeyID, NULL, sizeof(hotKeyID),NULL,&hotKeyID);

        UInt32 keyID = hotKeyID.id;

        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"hotKeyID = %u", keyID];
        NSSet *matchingHotKeys = [[DDHotKeyCenter sharedHotKeyCenter] hotKeysMatchingPredicate:predicate];
        if ([matchingHotKeys count] > 1) { NSLog(@"ERROR!"); }
        DDHotKey *matchingHotKey = [matchingHotKeys anyObject];

        NSEvent *event = [NSEvent eventWithEventRef:theEvent];
        NSEvent *keyEvent = [NSEvent keyEventWithType:NSKeyUp
                                             location:[event locationInWindow]
                                        modifierFlags:[event modifierFlags]
                                            timestamp:[event timestamp]
                                         windowNumber:-1
                                              context:nil
                                           characters:@""
                          charactersIgnoringModifiers:@""
                                            isARepeat:NO
                                              keyCode:[matchingHotKey keyCode]];

        [matchingHotKey invokeWithEvent:keyEvent];
    }

    return noErr;
}

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Answer 1

不，热键功能的全部意义在于事件被注册键的应用程序吞没。

您想要一个global event monitor，它允许您观察系统中其他任何地方发生的关键事件，但不会影响它们。

[NSEvent addGlobalMonitorForEventsMatchingMask:NSKeyUpMask
                                       handler:^(NSEvent * event){
    // See if the key is the one you want and act on it.
}];