/// <summary>
/// Invoke an async callback once after n milliseconds.
/// </summary>
/// <param name="milliseconds">The number of milliseconds to wait before the
/// callback is invoked.</param>
/// <param name="callback">The callback to invoke after n milliseconds.</param>
public static async Task Once(double milliseconds, Action callback)
{
var timer = new PreciseTimer();
await Task.Run(() =>
{
if (milliseconds < EPSILON)
{
callback();
return;
}
Wait(milliseconds - timer.ElapsedMilliseconds);
callback();
});
}
/// <summary>
/// Invoke an async callback every time n milliseconds have passed.
/// </summary>
/// <param name="milliseconds">The number of milliseconds to wait before the
/// callback is invoked.</param>
/// <param name="callback">The callback to invoke every n milliseconds.
/// When callback returns false the task is cancelled.</param>
public static async Task Every(double milliseconds, Func <bool> callback)
{
var timer = new PreciseTimer();
await Task.Run(() =>
{
if (milliseconds < EPSILON)
{
return;
}
while (true)
{
var w = timer.ElapsedMilliseconds % milliseconds;
Wait(milliseconds - w);
if (!callback())
{
break;
}
}
});
}
/// <summary>
/// Wait a specified number of milliseconds
/// <remarks>A millisecond is a thousandth of a second</remarks>
/// </summary>
public static void Wait(double milliseconds)
{
PreciseTimer.Wait(milliseconds);
}
static Pi()
{
now = new PreciseTimer();
PreciseTimer.Wait(1);
}