/// <summary>
/// Creates a task that will complete successfully after the given timespan.
/// </summary>
/// <param name="p_timespan">The amount of time to wait.</param>
/// <returns>A new task.</returns>
public static UnityTask RunDelay(float p_seconds, CancellationToken p_cancellationToken)
{
var tcs = new UnityTaskCompletionSource <int>();
var cancellation = p_cancellationToken.Register(() => tcs.TrySetCanceled());
tcs.Task.TaskGenerator = () => DelayCoroutine(p_seconds);
tcs.Task.ReturnResult = _ =>
{
try
{
tcs.TrySetResult(0);
cancellation.Dispose();
}
catch (Exception e)
{
tcs.TrySetException(e);
cancellation.Dispose();
}
};
if (Thread.CurrentThread.IsBackground)// 如果当前不在前端线程，则切换
{
ForegroundInvoker.Invoke(() =>
{
tcs.Task.TaskCoroutine = UnityTaskScheduler.FromCurrentSynchronizationContext().Post(tcs.Task.TaskGenerator(), tcs.Task.ReturnResult);
});
}
else
{
tcs.Task.TaskCoroutine = UnityTaskScheduler.FromCurrentSynchronizationContext().Post(tcs.Task.TaskGenerator(), tcs.Task.ReturnResult);
}
return(tcs.Task);
}
/// <summary>
/// try to cancel
/// </summary>
/// <param name="p_result"></param>
/// <returns></returns>
internal bool TrySetCanceled()
{
if (m_isCompleted)
{
return(false);
}
UnityTaskScheduler.FromCurrentSynchronizationContext().Stop(TaskCoroutine);
m_isCompleted = true;
this.m_isCanceled = true;
RunContinuations();
return(true);
}
/// <summary>
/// Creates and starts a Task<TResult>
/// </summary>
/// <typeparam name="TArg1"></typeparam>
/// <param name="p_func"></param>
/// <returns></returns>
public UnityTask <TResult> StartNew <TResult>(Func <System.Collections.IEnumerator> p_func)
{
var tcs = new UnityTaskCompletionSource <TResult>();
tcs.Task.TaskGenerator = () => p_func();
tcs.Task.ReturnResult = result =>
{
try
{
tcs.SetResult((TResult)result);
}
catch (Exception e)
{
tcs.SetException(e);
}
};
tcs.Task.TaskCoroutine = UnityTaskScheduler.FromCurrentSynchronizationContext().Post(tcs.Task.TaskGenerator(), tcs.Task.ReturnResult);
return(tcs.Task);
}
