检测按住的鼠标 [英] Detect mouse being held down

问题描述

我想要能够检测何时按住鼠标而不是点击。这是我的，但是我想要能够检测被按下的鼠标，而不是点击计数。

  （void）mouseDown：（NSEvent *）event; 
 {
 //而不是clickCount我想我的if语句是
 //如果鼠标被按下。 
 if（[event clickCount]< 1）
 {
 
} 
 else if（[event clickCount]> 1）
 {
 
} 
} 
  

解决方案>推测你想要检测鼠标是否被按下一段时间。这很简单;

在您的 mouseDown：中，您将启动一个计时器， 。你需要把它粘贴到一个ivar中，因为你也可以在 mouseUp中引用它：

   - （void）mouseDown：（NSEvent *）theEvent {
 mouseTimer = [NSTimer scheduledTimerWithTimeInterval：mouseHeldDelay 
 target：self 
 selector：@selector（mouseWasHeld :) 
 userInfo：theEvent 
 repeats：NO]; 
} 
  

mouseUp： ，销毁计时器：

   - （void）mouseUp：（NSEvent *）theEvent {
 [mouseTimer invalidate]; 
 mouseTimer = nil; 
} 
  

如果定时器触发，则知道鼠标按钮已按下您可以采取任何您喜欢的操作：

   - （void）mouseWasHeld：（NSTimer *） tim {
 NSEvent * mouseDownEvent = [tim userInfo]; 
 mouseTimer = nil; 
 //等
} 
  

I am trying to be able to detect when a mouse is held down instead of clicked. This is what I have, but instead of a click count I want to be able to detect the mouse being held down.

-(void)mouseDown:(NSEvent *)event;
{
    //instead of clickCount I want my if statement to be 
    // if the mouse is being held down.
    if ([event clickCount] < 1) 
    {

    }
    else if ([event clickCount] > 1)
    {

    }
}

解决方案

Presumably you want to detect whether the mouse is being held down for a certain period of time. This is pretty straightforward; it just requires a timer.

In your mouseDown:, you start a timer which will fire after your chosen period. You need to stick this into an ivar, because you will also refer to it in mouseUp:

- (void)mouseDown: (NSEvent *)theEvent {
    mouseTimer = [NSTimer scheduledTimerWithTimeInterval:mouseHeldDelay
                                                  target:self
                                                selector:@selector(mouseWasHeld:)
                                                userInfo:theEvent
                                                 repeats:NO];
}

In mouseUp:, destroy the timer:

- (void)mouseUp: (NSEvent *)theEvent {
    [mouseTimer invalidate];
    mouseTimer = nil;
}

If the timer fires, then you know that the mouse button has been held down for your specified period of time, and you can take whatever action you like:

- (void)mouseWasHeld: (NSTimer *)tim {
    NSEvent * mouseDownEvent = [tim userInfo];
    mouseTimer = nil;
    // etc.
}

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