protected async Task RunMessagePattern(int fadeTimeMillis, int duration, CancellationToken cancellationToken)
{
Stopwatch sw = new Stopwatch();
sw.Start();
// Cancel previous running.
AnimateOnMain(() =>
{
if (messageBox.AnimationIsRunning("FadeTo"))
{
messageBox.AbortAnimation("FadeTo");
}
});
bool initial = true;
string message = string.Empty;
int durationRequired = 0;
while (!cancellationToken.IsCancellationRequested) // Keep running pattern until done aerating.
{
cancellationToken.ThrowIfCancellationRequested();
for (int i = 0; i < messagePattern.Count; i++)
{
cancellationToken.ThrowIfCancellationRequested();
if (messagePattern[i] == MessageType.FUN)
{
message = funMessageSource.GetNext();
}
else if (messagePattern[i] == MessageType.FACT)
{
message = factMessageSource.GetNext();
}
if (initial)
{
durationRequired = EstimatedReadTimeMillis(message) + fadeTimeMillis;
}
else
{
durationRequired = EstimatedReadTimeMillis(message) + (fadeTimeMillis * 2);
}
// Don't show if too close to end, user wont' be able to read text.
if (durationRequired <= Math.Abs(duration - sw.ElapsedMilliseconds) + 500)
{
AnimateOnMain(async() =>
{
if (!initial) // Don't fade out on first.
{
if (!messageBox.AnimationIsRunning("FadeTo"))
{
await messageBox.FadeTo(0, (uint)fadeTimeMillis);
}
}
initial = false; // Always fade from now on.
messageBox.Text = message;
if (!messageBox.AnimationIsRunning("FadeTo"))
{
await messageBox.FadeTo(1.0d, (uint)fadeTimeMillis);
}
});
await Task.Delay(durationRequired, cancellationToken);
}
else
{
await Task.Delay((int)Math.Abs(duration - sw.ElapsedMilliseconds));
}
}
}
}