如何使用线程来“勾选"其他线程可以访问的计时器?

问题描述

当用户执行某项操作(在这种情况下，在StackPanel上进行触摸)时，我需要启动某种计时器(可能是在WPF中工作时为DispatcherTimer)，并且如果在一定的时间内再次发生另一次触摸，然后我会调用一个方法.您可能会猜到-这是实现双击功能.

When the user does something (touch on a StackPanel, in this case), I need to begin a timer of some sort (probably DispatcherTimer as I'm working in WPF) and if another touch happens again within a certain amount of time then I'll call a method. As you can probably guess - this is to implement a double-tap functionality.

我假设实现此目标的最佳方法是使用线程(即子线程增加时间跨度，只要再次触摸StackPanel即可由主线程检查该时间跨度?)

I'm assuming the best way to achieve this is through using threads (i.e. a child thread to increment a timespan which can be checked by the Main thread any time the StackPanel is touched again?)

谢谢

丹

推荐答案

您无需启动另一个线程即可执行此操作.

You do not need to start another thread to do this.

只需记下第一次敲击发生的时间，然后使用它即可.然后，您可以通过从当前时间中减去该时间来计算时间跨度:

Just take a timestamp of when the first tap happened and use this. You can then calculate the timespan by subtracting this time from the current time:

private DateTime _lastTap;
public void TapHandler()
{
  DateTime now = DateTime.UtcNow;
  TimeSpan span = now - lastTap;
  _lastTap = now;
  if (span < TimeSpan.FromSeconds(1)) {...}
}

或者，按照@DannyVarod的建议，您可以使用Stopwatch达到相同的结果(但计时更准确):

Alternatively, as suggested by @DannyVarod, you can use a Stopwatch to achieve the same result (but with more accurate timing):

private Stopwatch _stopwatch = new Stopwatch();
public void TapHandler()
{
  TimeSpan elapsed = _stopwatch.Elapsed;
  _stopwatch.Restart();
  if (elapsed < TimeSpan.FromSeconds(1)) {...}
}

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