private static WebVTTCue ParseCue(string block, TimeSpan timeOffset)
{
var cueReader = new StringReader(block);
WebVTTCue result = new WebVTTCue();
var line = cueReader.ReadLine();
if (!line.Contains(cueIdentifier))
{
result.StyleClass = line;
line = cueReader.ReadLine();
}
var parts = line.Split(cueHeaderSeparator, StringSplitOptions.RemoveEmptyEntries);
if (parts[1] != cueIdentifier)
{
throw new Exception("Invalid WebVTT cue time separator");
}
result.Begin = ParseTimeStamp(parts[0]).Add(timeOffset);
result.End = ParseTimeStamp(parts[2]).Add(timeOffset);
if (parts.Length >= 3)
{
var settingsDictionary = parts.Skip(3)
.Select(p => p.Split(':'))
.ToDictionary(i => i[0], i => i[1]);
result.Settings = ParseCueSettings(settingsDictionary);
}
StringBuilder cueContent = new StringBuilder();
do
{
line = cueReader.ReadLine();
if (line == null)
{
break;
}
if (line.Contains(cueIdentifier))
{
throw new Exception("Invalid WebVTT cue content");
}
if (cueContent.Length > 0)
{
cueContent.AppendLine();
}
cueContent.Append(line);
} while (true);
result.Content = ParseCueContent(cueContent.ToString(), timeOffset);
return(result);
}
public BoxElement GetRenderedCue(WebVTTCue cue)
{
var alignment = cue.Settings.Alignment;
var result = new BoxElement();
if (OutlineWidth > 0)
{
// create adjacent textblocks
var textBlockOutline1 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.Left,
new TranslateTransform() { X = -OutlineWidth, Y = 0 });
textBlockOutline1.Margin = new Thickness(OutlineWidth);
var textBlockOutline2 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.Top,
new TranslateTransform { X = 0, Y = -OutlineWidth });
textBlockOutline2.Margin = new Thickness(OutlineWidth);
var textBlockOutline3 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.Right,
new TranslateTransform { X = OutlineWidth, Y = 0 });
textBlockOutline3.Margin = new Thickness(OutlineWidth);
var textBlockOutline4 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.Bottom,
new TranslateTransform { X = 0, Y = OutlineWidth });
textBlockOutline4.Margin = new Thickness(OutlineWidth);
// create diagonal textblocks
var textBlockOutline5 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.TopLeft,
new TranslateTransform { X = -OutlineWidth, Y = -OutlineWidth });
textBlockOutline5.Margin = new Thickness(OutlineWidth);
var textBlockOutline6 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.TopRight,
new TranslateTransform { X = OutlineWidth, Y = -OutlineWidth });
textBlockOutline6.Margin = new Thickness(OutlineWidth);
var textBlockOutline7 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.BottomRight,
new TranslateTransform { X = OutlineWidth, Y = OutlineWidth });
textBlockOutline7.Margin = new Thickness(OutlineWidth);
var textBlockOutline8 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.BottomLeft,
new TranslateTransform { X = -OutlineWidth, Y = OutlineWidth });
textBlockOutline8.Margin = new Thickness(OutlineWidth);
result.AddBlock(textBlockOutline1);
result.AddBlock(textBlockOutline2);
result.AddBlock(textBlockOutline3);
result.AddBlock(textBlockOutline4);
result.AddBlock(textBlockOutline5);
result.AddBlock(textBlockOutline6);
result.AddBlock(textBlockOutline7);
result.AddBlock(textBlockOutline8);
}
var textBlock = GetRenderedCueTextBlock(cue, alignment, InnerBrush, TextPosition.Center);
textBlock.Margin = new Thickness(OutlineWidth);
result.AddBlock(textBlock);
return result;
}
private TextBlock GetRenderedCueTextBlock(WebVTTCue cue, WebVTTAlignment alignment, Brush brush, TextPosition textPosition, Transform transform = null)
{
var content = cue.Content;
var result = new TextBlock
{
TextWrapping = TextWrapping.Wrap,
RenderTransform = transform,
Foreground = brush
};
switch (alignment)
{
case WebVTTAlignment.Middle:
result.TextAlignment = TextAlignment.Center;
break;
case WebVTTAlignment.Left:
result.TextAlignment = TextAlignment.Left;
break;
case WebVTTAlignment.Right:
result.TextAlignment = TextAlignment.Right;
break;
case WebVTTAlignment.Start:
result.TextAlignment = TextAlignment.Left;
break;
case WebVTTAlignment.End:
result.TextAlignment = TextAlignment.Right;
break;
}
CreateInlines(cue, content, result.Inlines, brush);
// If a Text Rendering event handler has been added, call it.
if (this.TextRendering != null)
{
this.TextRendering(this, new CaptionTextEventArgs(result, textPosition));
}
return(result);
}
private void CreateInlines(WebVTTCue cue, IWebVTTInternalNode node, InlineCollection inlines, Brush brush)
{
foreach (var child in node.Nodes)
{
var inline = CreateInline(child, brush);
if (inline != null)
{
inlines.Add(inline);
if (inline is Span && child is IWebVTTInternalNode)
{
CreateInlines(cue, (IWebVTTInternalNode)child, ((Span)inline).Inlines, brush);
}
if (NodeRendering != null)
{
NodeRendering(this, new NodeRenderingEventArgs(cue, child, inline));
}
}
}
}
private void AddCue(WebVTTCue cue)
{
BoxElement element = renderer.GetRenderedCue(cue);
if (BoxStyle != null)
{
element.Style = BoxStyle;
}
element.FontSize = currentFontSize;
WebVTTLayoutPanel.SetAlignment(element, GetPanelAlignment(cue.Settings.Alignment));
WebVTTLayoutPanel.SetDirection(element, GetPanelAlignment(cue.Settings.WritingMode, cue.Content));
WebVTTLayoutPanel.SetLinePosition(element, cue.Settings.LinePosition);
WebVTTLayoutPanel.SetOrientation(element, GetPanelOrientation(cue.Settings.WritingMode));
WebVTTLayoutPanel.SetPosition(element, cue.Settings.TextPosition);
WebVTTLayoutPanel.SetSize(element, cue.Settings.Size);
WebVTTLayoutPanel.SetSnapToLines(element, cue.Settings.SnapToLines);
activeElements.Add(cue, element);
captionPanel.Children.Add(element);
}
private TextBlock GetRenderedCueTextBlock(WebVTTCue cue, WebVTTAlignment alignment, Brush brush, TextPosition textPosition, Transform transform = null)
{
var content = cue.Content;
var result = new TextBlock
{
TextWrapping = TextWrapping.Wrap,
RenderTransform = transform,
Foreground = brush
};
switch (alignment)
{
case WebVTTAlignment.Middle:
result.TextAlignment = TextAlignment.Center;
break;
case WebVTTAlignment.Left:
result.TextAlignment = TextAlignment.Left;
break;
case WebVTTAlignment.Right:
result.TextAlignment = TextAlignment.Right;
break;
case WebVTTAlignment.Start:
result.TextAlignment = TextAlignment.Left;
break;
case WebVTTAlignment.End:
result.TextAlignment = TextAlignment.Right;
break;
}
CreateInlines(cue, content, result.Inlines, brush);
// If a Text Rendering event handler has been added, call it.
if (this.TextRendering != null)
{
this.TextRendering(this, new CaptionTextEventArgs(result, textPosition));
}
return result;
}
private static WebVTTCue ParseCue(string block, TimeSpan timeOffset)
{
var cueReader = new StringReader(block);
WebVTTCue result = new WebVTTCue();
var line = cueReader.ReadLine();
if (!line.Contains(cueIdentifier))
{
result.StyleClass = line;
line = cueReader.ReadLine();
}
var parts = line.Split(cueHeaderSeparator, StringSplitOptions.RemoveEmptyEntries);
if (parts[1] != cueIdentifier) throw new Exception("Invalid WebVTT cue time separator");
result.Begin = ParseTimeStamp(parts[0]).Add(timeOffset);
result.End = ParseTimeStamp(parts[2]).Add(timeOffset);
if (parts.Length >= 3)
{
var settingsDictionary = parts.Skip(3)
.Select(p => p.Split(':'))
.ToDictionary(i => i[0], i => i[1]);
result.Settings = ParseCueSettings(settingsDictionary);
}
StringBuilder cueContent = new StringBuilder();
do
{
line = cueReader.ReadLine();
if (line == null) break;
if (line.Contains(cueIdentifier)) throw new Exception("Invalid WebVTT cue content");
if (cueContent.Length > 0) cueContent.AppendLine();
cueContent.Append(line);
} while (true);
result.Content = ParseCueContent(cueContent.ToString(), timeOffset);
return result;
}
private static WebVTTDocument ParseDocument(StringReader reader, TimeSpan timeOffset)
{
var blockReader = new BlockDocumentReader(reader);
if (!blockReader.ReadBlock().StartsWith(bodyIdentifier))
{
throw new Exception("Invalid WebVTT start identifier");
}
var result = new WebVTTDocument();
WebVTTCue previousCue = null;
while (true)
{
var block = blockReader.ReadBlock();
if (block == null)
{
break;
}
else if (!block.StartsWith(noteIdentifier)) // ignore comments
{
// cue found
var cue = ParseCue(block, timeOffset);
if (previousCue != null && cue.Begin < previousCue.Begin)
{
throw new Exception("Invalid WebVTT cue start time");
}
if (cue.End <= cue.Begin)
{
throw new Exception("Invalid WebVTT cue end time");
}
result.Cues.Add(cue);
previousCue = cue;
}
}
return(result);
}
public NodeRenderingEventArgs(WebVTTCue cue, IWebVTTNode node, Inline inline)
{
Cue = cue;
Node = node;
Inline = inline;
}
public NodeRenderingEventArgs(WebVTTCue cue, IWebVTTNode node, Inline inline)
{
Cue = cue;
Node = node;
Inline = inline;
}
private void CreateInlines(WebVTTCue cue, IWebVTTInternalNode node, InlineCollection inlines, Brush brush)
{
foreach (var child in node.Nodes)
{
var inline = CreateInline(child, brush);
if (inline != null)
{
inlines.Add(inline);
if (inline is Span && child is IWebVTTInternalNode)
{
CreateInlines(cue, (IWebVTTInternalNode)child, ((Span)inline).Inlines, brush);
}
if (NodeRendering != null) NodeRendering(this, new NodeRenderingEventArgs(cue, child, inline));
}
}
}
public Animation(WebVTTCue cue, TimeSpan timeStamp)
{
Cue = cue;
TimeStamp = timeStamp;
}
private void AddCue(WebVTTCue cue)
{
BoxElement element = renderer.GetRenderedCue(cue);
if (BoxStyle != null) element.Style = BoxStyle;
element.FontSize = currentFontSize;
WebVTTLayoutPanel.SetAlignment(element, GetPanelAlignment(cue.Settings.Alignment));
WebVTTLayoutPanel.SetDirection(element, GetPanelAlignment(cue.Settings.WritingMode, cue.Content));
WebVTTLayoutPanel.SetLinePosition(element, cue.Settings.LinePosition);
WebVTTLayoutPanel.SetOrientation(element, GetPanelOrientation(cue.Settings.WritingMode));
WebVTTLayoutPanel.SetPosition(element, cue.Settings.TextPosition);
WebVTTLayoutPanel.SetSize(element, cue.Settings.Size);
WebVTTLayoutPanel.SetSnapToLines(element, cue.Settings.SnapToLines);
activeElements.Add(cue, element);
captionPanel.Children.Add(element);
}
public Animation(WebVTTCue cue, TimeSpan timeStamp)
{
Cue = cue;
TimeStamp = timeStamp;
}
public BoxElement GetRenderedCue(WebVTTCue cue)
{
var alignment = cue.Settings.Alignment;
var result = new BoxElement();
if (OutlineWidth > 0)
{
// create adjacent textblocks
var textBlockOutline1 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.Left,
new TranslateTransform()
{
X = -OutlineWidth, Y = 0
});
textBlockOutline1.Margin = new Thickness(OutlineWidth);
var textBlockOutline2 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.Top,
new TranslateTransform {
X = 0, Y = -OutlineWidth
});
textBlockOutline2.Margin = new Thickness(OutlineWidth);
var textBlockOutline3 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.Right,
new TranslateTransform {
X = OutlineWidth, Y = 0
});
textBlockOutline3.Margin = new Thickness(OutlineWidth);
var textBlockOutline4 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.Bottom,
new TranslateTransform {
X = 0, Y = OutlineWidth
});
textBlockOutline4.Margin = new Thickness(OutlineWidth);
// create diagonal textblocks
var textBlockOutline5 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.TopLeft,
new TranslateTransform {
X = -OutlineWidth, Y = -OutlineWidth
});
textBlockOutline5.Margin = new Thickness(OutlineWidth);
var textBlockOutline6 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.TopRight,
new TranslateTransform {
X = OutlineWidth, Y = -OutlineWidth
});
textBlockOutline6.Margin = new Thickness(OutlineWidth);
var textBlockOutline7 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.BottomRight,
new TranslateTransform {
X = OutlineWidth, Y = OutlineWidth
});
textBlockOutline7.Margin = new Thickness(OutlineWidth);
var textBlockOutline8 = GetRenderedCueTextBlock(cue, alignment, OutlineBrush, TextPosition.BottomLeft,
new TranslateTransform {
X = -OutlineWidth, Y = OutlineWidth
});
textBlockOutline8.Margin = new Thickness(OutlineWidth);
result.AddBlock(textBlockOutline1);
result.AddBlock(textBlockOutline2);
result.AddBlock(textBlockOutline3);
result.AddBlock(textBlockOutline4);
result.AddBlock(textBlockOutline5);
result.AddBlock(textBlockOutline6);
result.AddBlock(textBlockOutline7);
result.AddBlock(textBlockOutline8);
}
var textBlock = GetRenderedCueTextBlock(cue, alignment, InnerBrush, TextPosition.Center);
textBlock.Margin = new Thickness(OutlineWidth);
result.AddBlock(textBlock);
return(result);
}
void ShowCue(WebVTTCue cue)
{
captionsPanel.ActiveCues.Add(cue);
}
void HideCue(WebVTTCue cue)
{
captionsPanel.ActiveCues.Remove(cue);
}
