/// <summary>
/// Applies handling for subtitles to textview
/// </summary>
/// <param name="action">Action that should be started when the user interacts with the source.</param>
/// <param name="sources">The parsed sources</param>
/// <param name="textView">Textiew the SubtitleLinks should be attached to</param>
/// <param name="text">Text representing the whole subtitle</param>
public static void ApplySubtitlesLinks(this UITextView textView, IInteractiveSourceAction action, List <Source> sources, NSAttributedString text)
{
if (action == null)
{
return;
}
Dictionary <Source, FinalSourcePosition> sourcePositions = new Dictionary <Source, FinalSourcePosition>();
var formattedTextWithSubstitutes = new NSMutableAttributedString(text);
// get the textpositions of each source and mark them
foreach (var source in sources)
{
if (source == null)
{
continue;
}
int startIndex = text.Value.IndexOf(source.SubstituteText, StringComparison.Ordinal);
var finalPostion = new FinalSourcePosition
{
Start = startIndex,
End = startIndex + source.SubstituteText.Length - 1
};
sourcePositions.Add(source, finalPostion);
var resources = IoCManager.Resolve <ApplicationResourcesProvider>();
formattedTextWithSubstitutes.AddAttribute(UIStringAttributeKey.ForegroundColor, (resources.TryGetResourceColorvalue("SecondaryColor")).ToUIColor(),
new NSRange(finalPostion.Start, source.SubstituteText.Length));
}
textView.AttributedText = formattedTextWithSubstitutes;
// make the source links clickable
textView.AddGestureRecognizer(new UITapGestureRecognizer(x => HandleTap(x, textView, sourcePositions, action)));
}
/// <summary>
/// Returns a SpannableString containing interactive sources for subtitles.
/// </summary>
/// <param name="action">Action that should be started when the user interacts with the source.</param>
/// <param name="textWithSubstitutes">The parsed text with substitutes</param>
/// <param name="sources">The parsed sources</param>
/// <returns>A SpannableString parsed from the textWithSubstitutes for the subtitles. Returns null, if the provided action is null.</returns>
public SpannableString CreateSubtitlesText(IInteractiveSourceAction action, string textWithSubstitutes, List <Source> sources)
{
if (action == null)
{
return(null);
}
var str = new SpannableString(textWithSubstitutes);
foreach (var src in sources)
{
if (src == null)
{
continue;
}
str.SetSpan(
ConvertSrcToClickableSpan(src, action),
src.StartIndex,
src.StartIndex + src.SubstituteText.Length,
SpanTypes.ExclusiveExclusive);
}
return(str);
}
/// <summary>
/// Converts a source to a ClickableSpan that executes the specified action.
/// </summary>
/// <param name="src">Source that should be converted to a ClickableSpan.</param>
/// <param name="action">Action that should be executed when the Click-event of the span is triggered.</param>
/// <returns>ClickableSpan for the provided Source instance.</returns>
private static ClickableSpan ConvertSrcToClickableSpan(Source src, IInteractiveSourceAction action)
{
if (src == null)
{
return(null);
}
InteractiveSourceClickableSpan span = new InteractiveSourceClickableSpan();
span.Click += v => action.Display(src);
return(span);
}
/// <summary>
/// Returns a SpannableString containing interactive sources for subtitles.
/// </summary>
/// <param name="action">Action that should be started when the user interacts with the source.</param>
/// <param name="textWithSubstitutes">The parsed text with substitutes</param>
/// <param name="sources">The parsed sources</param>
/// <returns>A SpannableString parsed from the textWithSubstitutes for the subtitles. Returns null, if the provided action is null.</returns>
public SpannableString CreateSubtitlesText(IInteractiveSourceAction action, ISpanned textWithSubstitutes, List <Source> sources)
{
if (action == null)
{
return(null);
}
var sourcePositions = new Dictionary <Source, FinalSourcePosition>();
// get the textpositions of each source and mark them
foreach (var source in sources)
{
if (source == null)
{
continue;
}
int startIndex = textWithSubstitutes.ToString().IndexOf(source.SubstituteText, StringComparison.Ordinal);
sourcePositions.Add(source, new FinalSourcePosition
{
Start = startIndex,
End = startIndex + source.SubstituteText.Length
});
}
var str = new SpannableString(textWithSubstitutes);
foreach (var src in sourcePositions)
{
if (src.Key == null)
{
continue;
}
str.SetSpan(
ConvertSrcToClickableSpan(src.Key, action),
src.Value.Start,
src.Value.End,
SpanTypes.ExclusiveExclusive);
}
return(str);
}
private static void HandleTap(UITapGestureRecognizer gestureRecognizer, UITextView textView, Dictionary <Source, FinalSourcePosition> sourcePositions,
IInteractiveSourceAction action)
{
var point = gestureRecognizer.LocationInView(textView);
point.Y += textView.ContentOffset.Y;
var tapPos = textView.GetClosestPositionToPoint(point);
// if a source link has been tapped: show the reference
nint clickedPos = textView.GetOffsetFromPosition(textView.BeginningOfDocument, tapPos);
int pos = Convert.ToInt32(clickedPos);
var clickedSource = sourcePositions.SingleOrDefault(x => x.Value.Start <= pos && pos <= x.Value.End).Key;
if (clickedSource != null)
{
action.Display(clickedSource);
}
}
protected override void OnBindingContextChanged()
{
base.OnBindingContextChanged();
this.SetBinding(ActionProperty, "Action", BindingMode.TwoWay);
Action = new SwitchTabAndScrollToSourceAction(this);
}
