如果按下了某个修饰符但没有其他修饰符，请检查NSEvent的modifierFlags

问题描述

我在NSEvent中尝试了 addLocalMonitorForEventsMatchingMask：handler：方法，并遇到了以下问题：如何找出

I just experimented with the addLocalMonitorForEventsMatchingMask:handler: method in NSEvent and came across the following question: How do I find out if only certain modifiers were pressed?

一个简短的例子来将这个问题设置为上下文：我想听快捷方式&＃x2318; + W 。因此我写了以下代码：

A short example to set this question into context: I wanted to listen for the shortcut "⌘+W". Therefore I wrote the following code:

[NSEvent addLocalMonitorForEventsMatchingMask:NSKeyDownMask handler:^(NSEvent *theEvent) {
    if ([theEvent modifierFlags] & NSCommandKeyMask && [theEvent keyCode] == 13) {
        [self.window performClose:self];
    }
    return theEvent;
}];

这很好，但是即使按下更多的修饰键， &＃x2303; +&＃x2318; + W或&＃x21E7; +&＃x2303; +&＃x2325; +&＃x2318; + W。是否有办法规避这种情况？

This works well, however the shortcut will be triggered, even if more modifier keys are pressed, e.g. "⌃+⌘+W" or "⇧+⌃+⌥+⌘+W". Is there a way to circumvent this?

一个简单的解决方案是检查所有其他修饰键，并确保它们不被按下。这看起来很乏味和容易出错 - 除了它丑陋，因为它现在与一元&。此外，如果（由于某种原因）另一个修饰键添加到键盘布局，您可能会遇到麻烦。

A simple solution would be to check for all other modifier keys and ensure they are not pressed. This seems tedious and error prone - besides it's ugly enough as it is now with the unary "&". In addition you may get into trouble if (for some reason) another modifier key is added to keyboard layouts.

一如既往，我感谢任何建议。 >

As always I'm thankful for any recommendations.

推荐答案

我认为这样做：

// Mask out everything but the key flags
NSUInteger flags = [theEvent modifierFlags] & NSDeviceIndependentModifierFlagsMask;
if( flags == NSCommandKeyMask ){
    // Got it!
}

这篇关于如果按下了某个修饰符但没有其他修饰符，请检查NSEvent的modifierFlags的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！