Command-Key-Up可可 [英] Command-Key-Up Cocoa

问题描述

我试图模仿cmd标签键盘快捷方式的功能，用户可以在应用程序之间切换某个键，然后当他们释放命令的时候发生。

I'm trying to mimic the functionality of the cmd-tab keyboard shortcut where the user can switch between applications hitting a certain key and then when they release command something happens.

我现在使用这个代码，但它只能检测keydown。我需要这个在键上发射

I'm using this code right now but it can only detects keydown. I need this to fire on key up

- (void)flagsChanged:(NSEvent *)theEvent {

if ([theEvent modifierFlags] & NSCommandKeyMask) {
    NSLog(@"Do my stuff here");
}
}

感谢

推荐答案

根据文档：

通知接收方用户已按下或已发布修饰符
键（Shift，Control等）。

Informs the receiver that the user has pressed or released a modifier key (Shift, Control, and so on).

你需要在这里做的是当你得到其中命令键失效的事件，你需要在某个地方设置一个标志，并在随后的调用中，检查命令键是否失效。

What you need to do here is when you get the event in which the command key goes down, you need to set a flag somewhere, and in subsequent calls, check for the absence of the command key being down.

例如，假设你有一个名为 _cmdKeyDown 的ivar：

For instance, assuming you have an ivar called _cmdKeyDown:

- (void)flagsChanged:(NSEvent *)theEvent
{
    [super flagsChanged:theEvent];

    NSUInteger f = [theEvent modifierFlags];
    BOOL isDown = !!(f & NSCommandKeyMask);
    if (isDown != _cmdKeyDown)
    {
        NSLog(@"State changed. Cmd Key is: %@", isDown ? @"Down" : @"Up");
        _cmdKeyDown = isDown;
    }
}

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