辅助功能API - Cocoa [英] Accessibility API - Cocoa

问题描述

有任何方式（我认为使用辅助功能API）能够在我的应用程序中按下按钮/按键，然后将鼠标悬停在菜单项上，再按一次，然后返回菜单项的名称，菜单in and the app？

Is there any way (I think using the Accessibility API) to be able to press a button/keystroke in my app and then hover over a menubar item and press again and then return the name of the menu item, the menu it's in and the app?

我想在Cocoa / Objective-C（Mac）中执行此操作。

I want to do this in Cocoa/Objective-C (Mac).

推荐答案

这是 kAXMenuItemSelectedNotification 通知的用途。使用此功能的一个简单方法是使用 UI浏览器：

That's what the kAXMenuItemSelectedNotification notification is for. An easy way to play with this stuff is using UI Browser:

• 在目标弹出式菜单中选择一个应用。


• 从抽屉弹出式菜单中选择通知。


• 点击选择菜单项和注册（或只需双击表格）。


• 从查看菜单中选择通知日志 li>
  
• 切换到您选择的应用程序并选择菜单项。

• Pick an application in the "Target" popup menu.
• Pick "Notifications" from the "Drawer" popup menu.
• Click "menu item selected" and "Register" (or just double-click in the table).
• Choose "Notification Log" from the View menu.
• Switch to the application you chose and pick a menu item.

被触发。您的代码可能如下所示：

That lets you see when notifications are triggered. Your code could look something like this:

AXError err;
AXObserverRef observer;

pid_t currentAppPID = [NSRunningApplication currentApplication].processIdentifier;
if ( (err = AXObserverCreate(currentAppPID, notificationCallback, &observer) != kAXErrorSuccess); // XXX failed

CFRunLoopAddSource(CFRunLoopGetCurrent(), AXObserverGetRunLoopSource(observer), kCFRunLoopDefaultMode);

AXUIElementRef element = AXUIElementCreateApplication(currentAppPID);
if (element == NULL); // XXX failed
if ( (err = AXObserverAddNotification(observer, element, kAXMenuItemSelectedNotification, NULL)) != kAXErrorSuccess); // XXX failed

请注意，在注册 NSWorkspaceDidActivateApplicationNotification 并注销最前端的应用程序（后者可能是最容易在10.6以下，因为它是最简单的，因为它是启动/退出）你会得到 NSRunningApplication 作为通知的一部分。）

Note that you'll have to observe every running app individually (and additional apps as they launch/quit), or register for NSWorkspaceDidActivateApplicationNotification and deregister/register with the frontmost app at that point (the latter is probably easiest under 10.6 because you get a NSRunningApplication as part of the notification).

我认为实际选择项目会更容易一个用户，但如果你真的想要按另一个键来完成操作，你可以观察 kAXSelectedChildrenChanged ，当选择从一个菜单项移动到另一个。

I would think actually selecting the item would be easier for a user, but if you really do want to press another key to complete the action, you can observe kAXSelectedChildrenChanged, which will be triggered when the selection moves from one menu item to another.

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