objective-c - DDHotKey - 跟踪而不取消事件

Question

我正在使用DDHotKey跟踪一些系统范围的键盘快捷键。当事件被触发时，只有我的应用程序收到它。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观察它？

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以下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，热键功能的全部要点是事件被注册该 key 的应用程序吞没。

你想要一个global event monitor ，它允许您观察系统中其他任何地方的关键事件，但不影响它们。

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