/// <summary>
/// Invokes the specified callback repeatedly until either the specified timeout expires or an
/// automation element is returned.
/// </summary>
/// <param name="callback">The get results callback method.</param>
/// <param name="timeout">The maximum amount of time to wait for the callback to return an automation element.</param>
/// <returns>The automation element, or enumarable, or null if no element was found.</returns>
protected object ExecuteGetResult(GetResultCallback callback, TimeSpan timeout)
{
var start = DateTime.Now;
var timeoutRemaining = (int)timeout.TotalMilliseconds;
while (true)
{
var result = callback();
if (result != null)
{
return(result);
}
if (timeoutRemaining > 0)
{
// The amount of time slept will never be more than the MaxSleepTimeout constant.
// The total time spent sleeping will also never be more than the total timeout specified.
var actualSleepTimeout = timeoutRemaining > MaxSleepTimeout ? MaxSleepTimeout : timeoutRemaining;
Thread.Sleep(actualSleepTimeout);
// The timeout is decremented so that the remaining time is the total time - elapsed time.
timeoutRemaining -= (int)(DateTime.Now - start).TotalMilliseconds;
}
else
{
// Time is up and still no element. So return null.
return(null);
}
}
}
/// <summary>
/// Invokes the specified callback repeatedly until either the specified timeout expires or an
/// automation element is returned.
/// </summary>
/// <param name="callback">The get results callback method.</param>
/// <param name="timeout">The maximum amount of time to wait for the callback to return an automation element.</param>
/// <returns>The automation element, or enumarable, or null if no element was found.</returns>
protected object ExecuteGetResult(GetResultCallback callback, TimeSpan timeout)
{
var start = DateTime.Now;
var timeoutRemaining = (int) timeout.TotalMilliseconds;
while (true) {
var result = callback();
if (result != null) return result;
if (timeoutRemaining > 0) {
// The amount of time slept will never be more than the MaxSleepTimeout constant.
// The total time spent sleeping will also never be more than the total timeout specified.
var actualSleepTimeout = timeoutRemaining > MaxSleepTimeout ? MaxSleepTimeout : timeoutRemaining;
Thread.Sleep(actualSleepTimeout);
// The timeout is decremented so that the remaining time is the total time - elapsed time.
timeoutRemaining -= (int) (DateTime.Now - start).TotalMilliseconds;
} else {
// Time is up and still no element. So return null.
return null;
}
}
}
