macos - 自定义 NSStatusItem 和 NSView 无法可靠地接收 NSTrackingEvents

Question

我有一个仅状态栏项目的应用程序，我试图在鼠标悬停时显示面板。我已经连接了自定义状态项(和关联的 View )并正在工作，但跟踪矩形仅在每十几次启动时接收事件。这让我相信某个地方发生了竞争条件，但我找不到它。在我的自定义状态栏项目 View 中:

- (id)initWithStatusItem:(NSStatusItem *)statusItem {
    CGFloat itemWidth = [statusItem length];
    CGFloat itemHeight = [[NSStatusBar systemStatusBar] thickness];
    NSRect itemRect = NSMakeRect(0.0, 0.0, itemWidth, itemHeight);
    NSLog(@"itemRect: %@", NSStringFromRect(itemRect));

    if ((self = [super initWithFrame:itemRect])) {
        _statusItem = statusItem;
        _statusItem.view = self;

        NSTrackingAreaOptions options = NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved | NSTrackingActiveAlways;
        NSTrackingArea *trackingArea = [[NSTrackingArea alloc] initWithRect:itemRect
                                                                    options:options
                                                                      owner:self
                                                                   userInfo:nil];
        [self addTrackingArea:trackingArea];

        [self.window setIgnoresMouseEvents:NO];
        [self.window setAcceptsMouseMovedEvents:YES];

        self.wantsLayer = YES;
    }
    return self;
}

- (void)mouseEntered:(NSEvent *)theEvent {
    [[NSNotificationCenter defaultCenter] postNotificationName:UAStatusItemMouseEnteredNotification object:nil];
}

- (void)mouseExited:(NSEvent *)theEvent {
    [[NSNotificationCenter defaultCenter] postNotificationName:UAStatusItemMouseExitedNotification object:nil];
}

在大多数启动中，应用程序不会响应跟踪鼠标事件，但时常会正确、完整地调用 mouseEntered: 和 mouseExited: 方法让我困惑。这是怎么回事，我做错了什么？

编辑 2012 年 7 月 17 日
我根据@Streams的答案更改了代码，但看到了同样的问题:

- (id)initWithStatusItem:(NSStatusItem *)statusItem {
    CGFloat itemWidth = [statusItem length];
    CGFloat itemHeight = [[NSStatusBar systemStatusBar] thickness];
    NSRect itemRect = NSMakeRect(0.0, 0.0, itemWidth, itemHeight);
    NSLog(@"itemRect: %@", NSStringFromRect(itemRect));

    if ((self = [super initWithFrame:itemRect])) {
        _statusItem = statusItem;
        _statusItem.view = self;            

        [self updateTrackingAreas];

        [self.window setIgnoresMouseEvents:NO];
        [self.window setAcceptsMouseMovedEvents:YES];

        self.wantsLayer = YES;
    }
    return self;
}

- (void)updateTrackingAreas {

    if (self.trackingArea)
        [self removeTrackingArea:self.trackingArea];

    [super updateTrackingAreas];

    self.trackingArea = [[NSTrackingArea alloc] initWithRect:CGRectZero
                                                     options:NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved | NSTrackingInVisibleRect | NSTrackingActiveAlways
                                                       owner:self
                                                    userInfo:nil];
    [self addTrackingArea:self.trackingArea];
}

编辑 2012 年 7 月 18 日
这是准系统sample project它使用一个众所周知的 github 项目(由 @Stream 编写)来显示问题。它无法可靠地接收鼠标悬停事件(如果有的话)。

Answer 1

我提出了 DTS 请求，让 Apple 查看此内容。以下是回复:

...you are using full screen in Xcode when starting your app. I wasn't doing this [before], but I now can reproduce the issue. From what I can tell it only happens when your app is started from full screen mode in Xcode. Your users won't be starting the app this way. This is a problem with AppKit's fullScreen mode, and not necessarily with your code.