让我的Cocoa应用程序响应键盘的播放/暂停键？ [英] Make my Cocoa app respond to the keyboard play/pause key?

问题描述

有没有办法让我的应用程式回应Mac上的播放/暂停按钮？

编辑： b
$ b

使用建议的代码，我得到此控制台消息：

无法连接操作按钮按下：到目标NSApplication

为什么会这样？

方案

我通过子类化NSApplication（并将应用程序的主类设置为此子类）在我自己的应用程序中实现了这一点。

相关行：

pre> #import< IOKit / hidsystem / ev_keymap.h>

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

//处理媒体键事件并返回
[self mediaKeyEvent：keyCode state：keyState];
return;
}

//继续到super
[super sendEvent：event];
}

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

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

//上一页
case NX_KEYTYPE_REWIND：
if（state == YES）
[（TSAppController *）[self delegate] seekBack：self];
break;
}
}


Is there a way to make my app respond to the play/pause button on Mac?

EDIT:

Using the suggested code,I get this console message:

Could not connect the action buttonPressed: to target of class NSApplication

Why would that be?

解决方案

I accomplished this in my own application by subclassing NSApplication (and setting the app's principal class to this subclass). It catches seek and play/pause keys and translates them to specific actions in my app delegate.

Relevant lines:

#import <IOKit/hidsystem/ev_keymap.h>

- (void)sendEvent:(NSEvent *)event
{
    // Catch media key events
    if ([event type] == NSSystemDefined && [event subtype] == 8)
    {
        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];
}

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

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

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

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