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

问题描述

某些Mac的应用程序，如iTunes和Spotify的，反应了播放/暂停/下一首/ $ P $上的一些Apple键盘pvious按钮。

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

presumably，我该怎么做？

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

推荐答案

我通过继承的NSApplication（和设置该类作为我的目标的信息应用程序类）具有以下做到这一点：

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];
}

国家在-mediaKeyEvent：状态：是向上/向下。在我的应用程序是有意义的只有播放/暂停按键反应时，它的备份（已完成pressing），但我不断地做出反应RW / FF事件，而最关键的是向下寻求。

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.

我很想知道一个更好的办法做到这一点，如果它存在，虽然。目前，除非用户在全球的键盘快捷方式禁用这些键，它控制着我的应用程序的和的iTunes中。 ： - ）

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code已使用很长一段时间在我的转录应用和行之有效的（除了上述全球键盘快捷键的问题）

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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