public static void ShowSubtitle(
[NotNull] this IEnumerable <OutlinedLabel> labels,
[NotNull] SubtitleSegment segment)
{
if (labels == null)
{
throw new ArgumentNullException(nameof(labels));
}
if (segment == null)
{
throw new ArgumentNullException(nameof(segment));
}
if (_currentlyShownSubtitles.ContainsKey(segment))
{
return;
}
var lines = GetAvailableLines(segment, labels).ToArray();
foreach (var line in lines)
{
line.Label.Text = line.Value;
}
_currentlyShownSubtitles.Add(segment, lines.Select(l => l.Label));
}
private async Task ScheduleSubtitleHidingAsync(SubtitleSegment subtitle, TimeSpan span)
{
var startTime = DateTime.Now;
await Task.Delay(span, _pauseToken.Token)
.ContinueWith(task =>
{
if (task.Status == TaskStatus.RanToCompletion)
{
if (_currentlyShownSubtitles.Remove(subtitle))
{
OnHideSubtitle(subtitle);
}
}
}, TaskScheduler.Current);
var leftTime = span.Subtract(TimeSpan.FromTicks(DateTime.Now.Subtract(startTime).Ticks));
if (leftTime > TimeSpan.FromMilliseconds(1))
{
await _manualResetEventAsync.WaitAsync();
if (!_forceHidingToken.IsCancellationRequested)
{
await ScheduleSubtitleHidingAsync(subtitle, leftTime);
}
}
}
private static IEnumerable <SubtitleLabelWrapper> GetAvailableLines(
SubtitleSegment segment,
IEnumerable <OutlinedLabel> labels)
{
var splitedLines = segment.Content.Split(new[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
var availableLines = labels.Where(l => string.IsNullOrEmpty(l.Text));
return(splitedLines.Reverse().Zip(availableLines, (s, label) => new SubtitleLabelWrapper(label, s)));
}
private async Task ShowSubtitleAsync(SubtitleSegment subtitle, TimeSpan duration)
{
var clone = subtitle.SerializedClone();
OnDisplaySubtitle(clone);
_currentlyShownSubtitles.Add(clone);
_forceHidingToken = new CancellationTokenSource();
await ScheduleSubtitleHidingAsync(clone, duration);
}
public static void HideSubtitle(
[NotNull] this IEnumerable <OutlinedLabel> labels,
[NotNull] SubtitleSegment segment)
{
if (labels == null)
{
throw new ArgumentNullException(nameof(labels));
}
if (segment == null)
{
throw new ArgumentNullException(nameof(segment));
}
if (_currentlyShownSubtitles.TryGetValue(segment, out var shownLabels))
{
foreach (var label in shownLabels)
{
label.Text = string.Empty;
}
_currentlyShownSubtitles.Remove(segment);
}
}
private void OnDisplaySubtitle(SubtitleSegment subtitle)
{
OnNotify(SubtitlesEventType.Display, subtitle);
}
private void OnHideSubtitle(SubtitleSegment subtitle)
{
OnNotify(SubtitlesEventType.Hide, subtitle);
}
