听 mac 键盘播放/暂停事件 [英] Listening to mac keyboard play/pause events

问题描述

某些 Mac 应用程序，例如 iTunes 和 Spotify，会对某些 Apple 键盘上的播放/暂停/下一个/上一个按钮做出反应.

Some mac apps, like iTunes and Spotify, react to the play/pause/next/previous buttons on some Apple keyboards.

大概他们正在利用某种 NSNotification，我该怎么做?

Presumably they're tapping into some sort of NSNotification, how can I do the same?

推荐答案

我通过使用以下内容对 NSApplication 进行子类化(并将该类设置为目标信息中的应用程序类)来做到这一点:

I do this by subclassing NSApplication (and setting that class as the application class in my target's info) with the following:

#import <IOKit/hidsystem/ev_keymap.h>

...

- (void)mediaKeyEvent:(int)key state:(BOOL)state
{
 switch (key)
 {
  // Play pressed
  case NX_KEYTYPE_PLAY:
   if (state == NO)
    [(TSAppController *)[self delegate] togglePlayPause:self];
   break;

  // FF pressed
  case NX_KEYTYPE_FAST:
   if (state == YES)
    [(TSAppController *)[self delegate] seekForward:self];
   break;

  // RW pressed
  case NX_KEYTYPE_REWIND:
   if (state == YES)
    [(TSAppController *)[self delegate] seekBack:self];
   break;
 }
}

- (void)sendEvent:(NSEvent *)event
{
 // Catch media key events
 if ([event type] == NSSystemDefined && [event subtype] == NX_SUBTYPE_AUX_CONTROL_BUTTONS)
 {
  int keyCode = (([event data1] & 0xFFFF0000) >> 16);
  int keyFlags = ([event data1] & 0x0000FFFF);
  int keyState = (((keyFlags & 0xFF00) >> 8)) == 0xA;

  // Process the media key event and return
  [self mediaKeyEvent:keyCode state:keyState];
  return;
 }

 // Continue on to super
 [super sendEvent:event];
}

-mediaKeyEvent:state: 中的状态"用于向上/向下.在我的应用中，只有在播放/暂停键恢复(按下完成)时才对它做出反应是有意义的，但我在按键按下以进行搜索时不断对 RW/FF 事件做出反应.

The "state" in -mediaKeyEvent:state: is for up/down. In my app it makes sense to only react to the play/pause key when it's back up (done pressing), but I continuously react to RW/FF events while the key is down for seeking.

不过，如果存在更好的方法，我很想知道.目前，除非用户在全局键盘快捷键中禁用这些键，否则它会控制我的应用和 iTunes.:-)

I'd love to know of a better way to do this if it exists, though. Currently, unless the user disables these keys in the global keyboard shortcuts, it controls my app and iTunes. :-)

这段代码已经在我的转录应用中使用了很长时间并且运行良好(除了全局键盘快捷键问题以上).

This code has been used quite awhile in my transcription app and works well (aside from the global keyboard shortcut issue above).

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