async Task <bool> ShowAsync(EWidget target, Easing easing = null, uint length = 300, CancellationToken cancelltaionToken = default(CancellationToken))
{
var tcs = new TaskCompletionSource <bool>();
await Task.Delay(1000);
if (cancelltaionToken.IsCancellationRequested)
{
cancelltaionToken.ThrowIfCancellationRequested();
}
target.Show();
var opacity = target.Opacity;
if (opacity == 255 || opacity == -1)
{
return(true);
}
new Animation((progress) =>
{
target.Opacity = opacity + (int)((255 - opacity) * progress);
}).Commit(this, "FadeIn", length: length, finished: (p, e) =>
{
target.Opacity = 255;
tcs.SetResult(true);
});
return(await tcs.Task);
}
async Task <bool> HideAsync(EWidget target, Easing easing = null, uint length = 300)
{
var tcs = new TaskCompletionSource <bool>();
var opacity = target.Opacity;
if (opacity == -1)
{
opacity = 255;
}
new Animation((progress) =>
{
target.Opacity = opacity - (int)(progress * opacity);
}).Commit(this, "FadeOut", length: length, finished: (p, e) =>
{
target.Opacity = 0;
target.Hide();
tcs.SetResult(true);
});
return(await tcs.Task);
}