private void AppendParagraph(RichTextBlockDiffContext richTextBlockData, string text, ref int index, Color?background = null, Color?foreground = null)
{
var paragraph = new Paragraph
{
LineStackingStrategy = LineStackingStrategy.BlockLineHeight,
Foreground = foreground.HasValue
? _brushFactory.GetOrCreateSolidColorBrush(foreground.Value)
: _defaultForeground,
};
paragraph.LineHeight = paragraph.FontSize + 6;
var run = new Run {
Text = text
};
paragraph.Inlines.Add(run);
richTextBlockData.Blocks.Add(paragraph);
if (background != null)
{
richTextBlockData.AddTextHighlighter(new TextRange()
{
StartIndex = index, Length = text.Length
}, background.Value);
}
index += text.Length;
}
private Inline NewRun(RichTextBlockDiffContext richTextBlockData, string text, ref int index, Color?background = null, Color?foreground = null)
{
var run = new Run
{
Text = text,
Foreground = foreground.HasValue
? _brushFactory.GetOrCreateSolidColorBrush(foreground.Value)
: _defaultForeground
};
if (background != null)
{
richTextBlockData.AddTextHighlighter(new TextRange()
{
StartIndex = index, Length = text.Length
}, background.Value);
}
index += text.Length;
return(run);
}
private RichTextBlockDiffContext RenderDiff(System.Collections.Generic.List <OldNew <DiffPiece> > lines, Func <OldNew <DiffPiece>, DiffPiece> lineSelector, Func <OldNew <DiffPiece>, DiffPiece> pieceSelector)
{
var context = new RichTextBlockDiffContext(_brushFactory);
int index = 0;
foreach (var line in lines)
{
var lineLength = Math.Max(line.Old.Text?.Length ?? 0, line.New.Text?.Length ?? 0);
var lineSubPieces = line.Old.SubPieces.Zip(line.New.SubPieces, (oldPiece, newPiece) => new OldNew <DiffPiece> {
Old = oldPiece, New = newPiece, Length = Math.Max(oldPiece.Text?.Length ?? 0, newPiece.Text?.Length ?? 0)
});
var oldNewLine = lineSelector(line);
switch (oldNewLine.Type)
{
case ChangeType.Unchanged:
AppendParagraph(context, oldNewLine.Text ?? string.Empty, ref index, null);
break;
case ChangeType.Imaginary:
AppendParagraph(context, new string(BreakingSpace, lineLength), ref index, Colors.Gray, Colors.LightCyan);
break;
case ChangeType.Inserted:
AppendParagraph(context, oldNewLine.Text ?? string.Empty, ref index, Colors.LightGreen);
break;
case ChangeType.Deleted:
AppendParagraph(context, oldNewLine.Text ?? string.Empty, ref index, Colors.OrangeRed);
break;
case ChangeType.Modified:
context.Blocks.Add(ConstructModifiedParagraph(pieceSelector, lineSubPieces, context, ref index));
break;
}
}
return(context);
}
private Paragraph ConstructModifiedParagraph(Func <OldNew <DiffPiece>, DiffPiece> pieceSelector, IEnumerable <OldNew <DiffPiece> > lineSubPieces, RichTextBlockDiffContext context, ref int index)
{
var paragraph = new Paragraph()
{
LineStackingStrategy = LineStackingStrategy.BlockLineHeight,
Foreground = _defaultForeground,
};
paragraph.LineHeight = paragraph.FontSize + 6;
foreach (var subPiece in lineSubPieces)
{
var oldNewPiece = pieceSelector(subPiece);
switch (oldNewPiece.Type)
{
case ChangeType.Unchanged: paragraph.Inlines.Add(NewRun(context, oldNewPiece.Text ?? string.Empty, ref index, Colors.Yellow)); break;
case ChangeType.Imaginary: paragraph.Inlines.Add(NewRun(context, oldNewPiece.Text ?? string.Empty, ref index)); break;
case ChangeType.Inserted: paragraph.Inlines.Add(NewRun(context, oldNewPiece.Text ?? string.Empty, ref index, Colors.LightGreen)); break;
case ChangeType.Deleted: paragraph.Inlines.Add(NewRun(context, oldNewPiece.Text ?? string.Empty, ref index, Colors.OrangeRed)); break;
case ChangeType.Modified: paragraph.Inlines.Add(NewRun(context, oldNewPiece.Text ?? string.Empty, ref index, Colors.Yellow)); break;
}
paragraph.Inlines.Add(NewRun(context, new string(BreakingSpace, subPiece.Length - (oldNewPiece.Text ?? string.Empty).Length), ref index, Colors.Gray, Colors.LightCyan));
}
return(paragraph);
}