async void OnStarted(object sender, EventArgs e)
{
TaskCompletionSource <bool> tcs = null;
_startButton.IsEnabled = false;
_listView.ScrollTo(_testData[0], ScrollToPosition.MakeVisible, false);
await Task.Delay(100);
var animator = DependencyService.Get <IEcoreAnimator>(DependencyFetchTarget.GlobalInstance);
_started = true;
_frameCount = 0;
_animationCount = 0;
object target = null;
_stopWatch.Reset();
_animationStopWatch.Reset();
_listView.ItemAppearing += itemAppearing;
animator.Animation += OnAnimation;
for (int i = 10; i < 300; i += 20)
{
tcs = new TaskCompletionSource <bool>();
target = _testData[i];
_listView.ScrollTo(target, ScrollToPosition.MakeVisible, true);
await tcs.Task;
}
_listView.ItemAppearing -= itemAppearing;
animator.Animation -= OnAnimation;
_stopWatch.Stop();
_animationStopWatch.Stop();
if (_stopWatch.ElapsedMilliseconds > 0)
{
double fps = (_frameCount * 1000.0) / _stopWatch.ElapsedMilliseconds;
double aniFps = (_animationCount * 1000.0) / _animationStopWatch.ElapsedMilliseconds;
_ = DisplayAlert("FPS", $"EvasFPS {fps:f2} fps \nAnimator FPS : {aniFps:f2} fps", "OK");
}
_started = false;
_startButton.IsEnabled = true;
void itemAppearing(object s, ItemVisibilityEventArgs evt)
{
if (evt.Item == target)
{
tcs.TrySetResult(true);
}
}
}
private void OnCheckEnteringSpeed(object sender, EventArgs e)
{
_listView.RenderPost -= OnCheckEnteringSpeed;
double currentTime = EcoreAnimator.CurrentTime;
_enteringSpeed = (currentTime - _enteringSpeed) * 1000.0;
Console.WriteLine($"OnCheckEnteringSpeed currentTime:{currentTime}, _enteringSpeed:{_enteringSpeed}");
_frameSet = GlobalScrollConfig.BringInScrollFriction;
GlobalScrollConfig.BringInScrollFriction = TimeSet;
Console.WriteLine($"OnCheckEnteringSpeed _frameSet:{_frameSet}, TimeSet:{TimeSet}");
_listView.ScrollTo(ItemTarget, ScrollToPosition.MakeVisible, true);
}