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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