Mac OS X - 如何监视窗口更改事件？
我正在开发一个 Cocoa 应用程序，它显示打开的窗口列表并突出显示当前焦点窗口。我的问题是我找不到系统通知来通知我的应用程序主（又名“聚焦”或“前景”）窗口已更改。我尝试过：
[[[NSWorkspace sharedWorkspace] notificationCenter] addObserver:self selector:@selector(wsNotificationHook:) name:NSWorkspaceDidActivateApplicationNotification object:nil];
但它监视应用程序更改：当在同一应用程序内执行窗口更改时，它不会被触发（例如，如果我使用 exposè 在两个 Firefox 窗口之间传递）。是否有我可以监视的系统范围事件来跟踪主窗口的更改？
先感谢您！
I'm developing a Cocoa application that shows a list of opened windows and highlights the current focused one. My problem is that I can't find a system notification to inform my app that the main (aka "focused" or "foreground") window has changed. I tried with:
[[[NSWorkspace sharedWorkspace] notificationCenter] addObserver:self selector:@selector(wsNotificationHook:) name:NSWorkspaceDidActivateApplicationNotification object:nil];
but it monitors APPLICATION change: it isn't get fired when a change of window is executed INSIDE the same application (for example, if I pass between two Firefox windows using exposè). Is there a system-wide event that I can monitor to track a change of the main window?
Thank you in advance!
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您将获得的最接近的可能是辅助功能 API。请参阅此处和此处对于具有（部分）解决方案的类似问题。
The closest you'll get will probably be the accessibility APIs. See here and here for similar questions with (partial) solutions.