4

根据这篇文章：

ShortcutRecorder 记录 CMD+Tab

调用setCanCaptureGlobalHotKeys:YESShortCutRecorder 控件应该允许您捕获 CMD+TAB。但是，它似乎不起作用。我自己创建了这个小应用程序来看看发生了什么：

OSStatus myHotKeyHandler(EventHandlerCallRef nextHandler, EventRef anEvent, void *userData)
{
    NSLog(@"YEAY WE DID A GLOBAL HOTKEY");
    return noErr;
}

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    EventHotKeyRef myHotKeyRef;
    EventHotKeyID myHotKeyID;
    EventTypeSpec eventType;

    eventType.eventClass = kEventClassKeyboard;
    eventType.eventKind = kEventHotKeyPressed;

    myHotKeyID.signature = 'mhk1';
    myHotKeyID.id = 1;

    InstallApplicationEventHandler(&myHotKeyHandler, 1, &eventType, NULL, NULL);

    OSStatus status = RegisterEventHotKey(kVK_Tab,
                                          cmdKey,
                                          myHotKeyID,
                                          GetApplicationEventTarget(),
                                          0,
                                          &myHotKeyRef);

    NSLog(@"status:%d", status);
}

@end

如果我使用cmdKey + optionKey，那么它确实有效。

是否有另一种方法可以在我自己的 Mountain Lion 应用程序中捕获 CMD+TAB？CMD+OPTION+TAB 对我来说不够好。

4

1 回答 1

5

自从 2010 年提出这个问题以来，情况发生了一些变化！Dock.app 使用Event Tap检测到 ⌘⇥ ，并且该事件不再返回到应用程序。

您仍然可以钩住⌘⇥，但您需要自己使用 Event Tap 击败 Dock。这是一些示例代码，由osxbook.com提供：

// alterkeys.c
// http://osxbook.com
//
// Complile using the following command line:
//     gcc -Wall -o alterkeys alterkeys.c -framework ApplicationServices
//
// You need superuser privileges to create the event tap, unless accessibility
// is enabled. To do so, select the "Enable access for assistive devices"
// checkbox in the Universal Access system preference pane.

#include <ApplicationServices/ApplicationServices.h>

// This callback will be invoked every time there is a keystroke.
//
CGEventRef
myCGEventCallback(CGEventTapProxy proxy, CGEventType type,
                  CGEventRef event, void *refcon)
{
    // Paranoid sanity check.
    if ((type != kCGEventKeyDown) && (type != kCGEventKeyUp))
        return event;

    // The incoming keycode.
    CGKeyCode keycode = (CGKeyCode)CGEventGetIntegerValueField(
                                       event, kCGKeyboardEventKeycode);

    // Swap 'a' (keycode=0) and 'z' (keycode=6).
    if (keycode == (CGKeyCode)0)
        keycode = (CGKeyCode)6;
    else if (keycode == (CGKeyCode)6)
        keycode = (CGKeyCode)0;

    // Set the modified keycode field in the event.
    CGEventSetIntegerValueField(
        event, kCGKeyboardEventKeycode, (int64_t)keycode);

    // We must return the event for it to be useful.
    return event;
}

int
main(void)
{
    CFMachPortRef      eventTap;
    CGEventMask        eventMask;
    CFRunLoopSourceRef runLoopSource;

    // Create an event tap. We are interested in key presses.
    eventMask = ((1 << kCGEventKeyDown) | (1 << kCGEventKeyUp));
    eventTap = CGEventTapCreate(kCGSessionEventTap, kCGHeadInsertEventTap, 0,
                                eventMask, myCGEventCallback, NULL);
    if (!eventTap) {
        fprintf(stderr, "failed to create event tap\n");
        exit(1);
    }

    // Create a run loop source.
    runLoopSource = CFMachPortCreateRunLoopSource(
                        kCFAllocatorDefault, eventTap, 0);

    // Add to the current run loop.
    CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource,
                       kCFRunLoopCommonModes);

    // Enable the event tap.
    CGEventTapEnable(eventTap, true);

    // Set it all running.
    CFRunLoopRun();

    // In a real program, one would have arranged for cleaning up.

    exit(0);
}

这样做的缺点是您无法在 App Store 上沙箱或发布使用 ⌘⇥ 的应用程序。不仅应该很明显为什么在这些环境中不允许使用 Event Taps（它们使您能够终止甚至改变事件），而且 Dock 在 ⌘⇥ 上提供的功能非常有用，并且无法重新映射到不同的键盘快捷键，因此即使是Witch和Switch，默认情况下也会避免使用它。

于 2013-07-22T07:51:17.737 回答