public HtmlElement(int offset, int nesting, bool isEnd, HighlightingColor color)
{
this.Offset = offset;
this.Nesting = nesting;
this.IsEnd = isEnd;
this.Color = color;
}
void PushColor(HighlightingColor color)
{
if (highlightedLine == null)
{
return;
}
if (color == null)
{
highlightedSectionStack.Push(null);
}
else if (lastPoppedSection != null && lastPoppedSection.Color == color &&
lastPoppedSection.Offset + lastPoppedSection.Length == position + lineStartOffset)
{
highlightedSectionStack.Push(lastPoppedSection);
lastPoppedSection = null;
}
else
{
HighlightedSection hs = new HighlightedSection {
Offset = position + lineStartOffset,
Color = color
};
highlightedLine.Sections.Add(hs);
highlightedSectionStack.Push(hs);
lastPoppedSection = null;
}
}
internal static void ApplyColorToElement(VisualLineElement element, HighlightingColor color, ITextRunConstructionContext context)
{
if (color.Foreground != null)
{
Brush b = color.Foreground.GetBrush(context);
if (b != null)
{
element.TextRunProperties.SetForegroundBrush(b);
}
}
if (color.Background != null)
{
Brush b = color.Background.GetBrush(context);
if (b != null)
{
element.BackgroundBrush = b;
}
}
if (color.FontStyle != null || color.FontWeight != null)
{
Typeface tf = element.TextRunProperties.Typeface;
element.TextRunProperties.SetTypeface(new Typeface(
tf.FontFamily,
color.FontStyle ?? tf.Style,
color.FontWeight ?? tf.Weight,
tf.Stretch
));
}
if (color.Underline ?? false)
{
element.TextRunProperties.SetTextDecorations(TextDecorations.Underline);
}
}
/// <summary>
/// Gets whether the color needs to be written out to HTML.
/// </summary>
public virtual bool ColorNeedsSpanForStyling(HighlightingColor color)
{
if (color == null)
{
throw new ArgumentNullException("color");
}
return(!string.IsNullOrEmpty(color.ToCss()));
}
/// <summary>
/// Gets whether the color is empty (has no effect on a VisualLineTextElement).
/// For example, the C# "Punctuation" is an empty color.
/// </summary>
internal static bool IsEmptyColor(HighlightingColor color)
{
if (color == null)
{
return(true);
}
return(color.Background == null && color.Foreground == null &&
color.FontStyle == null && color.FontWeight == null &&
color.Underline == null);
}
/// <summary>
/// Creates a new RichTextModelWriter that inserts into document, starting at insertionOffset.
/// </summary>
public RichTextModelWriter(RichTextModel richTextModel, IDocument document, int insertionOffset)
: base(new DocumentTextWriter(document, insertionOffset))
{
if (richTextModel == null)
{
throw new ArgumentNullException("richTextModel");
}
this.richTextModel = richTextModel;
this.documentTextWriter = (DocumentTextWriter)base.textWriter;
currentColor = richTextModel.GetHighlightingAt(Math.Max(0, insertionOffset - 1));
}
/// <summary>
/// Creates WPF Run instances that can be used for TextBlock.Inlines.
/// </summary>
public Run[] CreateRuns()
{
Run[] runs = new Run[stateChanges.Length];
for (int i = 0; i < runs.Length; i++)
{
int startOffset = stateChangeOffsets[i];
int endOffset = i + 1 < stateChangeOffsets.Length ? stateChangeOffsets[i + 1] : text.Length;
Run r = new Run(text.Substring(startOffset, endOffset - startOffset));
HighlightingColor state = stateChanges[i];
ApplyColorToTextElement(r, state);
runs[i] = r;
}
return(runs);
}
/// <summary>
/// Writes the HTML attribute for the style to the text writer.
/// </summary>
public virtual void WriteStyleAttributeForColor(TextWriter writer, HighlightingColor color)
{
if (writer == null)
{
throw new ArgumentNullException("writer");
}
if (color == null)
{
throw new ArgumentNullException("color");
}
writer.Write(" style=\"");
WebUtility.HtmlEncode(color.ToCss(), writer);
writer.Write('"');
}
/// <summary>
/// Sets the HighlightingColor for the specified range of text,
/// completely replacing the existing highlighting in that area.
/// </summary>
public void SetHighlighting(int offset, int length, HighlightingColor color)
{
if (length <= 0)
{
return;
}
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
stateChanges[startIndex] = color != null?color.Clone() : new HighlightingColor();
stateChanges.RemoveRange(startIndex + 1, endIndex - (startIndex + 1));
stateChangeOffsets.RemoveRange(startIndex + 1, endIndex - (startIndex + 1));
}
/// <summary>
/// Creates WPF Run instances that can be used for TextBlock.Inlines.
/// </summary>
/// <param name="textSource">The text source that holds the text for this RichTextModel.</param>
public Run[] CreateRuns(ITextSource textSource)
{
Run[] runs = new Run[stateChanges.Count];
for (int i = 0; i < runs.Length; i++)
{
int startOffset = stateChangeOffsets[i];
int endOffset = i + 1 < stateChangeOffsets.Count ? stateChangeOffsets[i + 1] : textSource.TextLength;
Run r = new Run(textSource.GetText(startOffset, endOffset - startOffset));
HighlightingColor state = stateChanges[i];
RichText.ApplyColorToTextElement(r, state);
runs[i] = r;
}
return(runs);
}
/// <inheritdoc/>
public override void BeginSpan(HighlightingColor highlightingColor)
{
WriteIndentationAndSpace();
if (options.ColorNeedsSpanForStyling(highlightingColor))
{
htmlWriter.Write("<span");
options.WriteStyleAttributeForColor(htmlWriter, highlightingColor);
htmlWriter.Write('>');
endTagStack.Push("</span>");
}
else
{
endTagStack.Push(null);
}
}
/// <summary>
/// Applies the HighlightingColor to the specified range of text.
/// If the color specifies <c>null</c> for some properties, existing highlighting is preserved.
/// </summary>
public void ApplyHighlighting(int offset, int length, HighlightingColor color)
{
if (color == null || color.IsEmptyForMerge)
{
// Optimization: don't split the HighlightingState when we're not changing
// any property. For example, the "Punctuation" color in C# is
// empty by default.
return;
}
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
for (int i = startIndex; i < endIndex; i++)
{
stateChanges[i].MergeWith(color);
}
}
internal static void ApplyColorToTextElement(TextElement r, HighlightingColor state)
{
if (state.Foreground != null)
{
r.Foreground = state.Foreground.GetBrush(null);
}
if (state.Background != null)
{
r.Background = state.Background.GetBrush(null);
}
if (state.FontWeight != null)
{
r.FontWeight = state.FontWeight.Value;
}
if (state.FontStyle != null)
{
r.FontStyle = state.FontStyle.Value;
}
}
/// <summary>
/// Applies the properties from the HighlightingColor to the specified text segment.
/// </summary>
public void SetHighlighting(int offset, int length, HighlightingColor color)
{
if (color == null)
{
throw new ArgumentNullException("color");
}
if (color.Foreground == null && color.Background == null && color.FontStyle == null && color.FontWeight == null && color.Underline == null)
{
// Optimization: don't split the HighlightingState when we're not changing
// any property. For example, the "Punctuation" color in C# is
// empty by default.
return;
}
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
for (int i = startIndex; i < endIndex; i++)
{
stateChanges[i].MergeWith(color);
}
}
void Insert(ref int pos, ref int newSectionStart, int insertionEndPos, HighlightingColor color, Stack <int> insertionStack)
{
if (newSectionStart >= insertionEndPos)
{
// nothing to insert here
return;
}
while (insertionStack.Peek() <= newSectionStart)
{
insertionStack.Pop();
}
while (insertionStack.Peek() < insertionEndPos)
{
int end = insertionStack.Pop();
// insert the portion from newSectionStart to end
if (end > newSectionStart)
{
this.Sections.Insert(pos++, new HighlightedSection {
Offset = newSectionStart,
Length = end - newSectionStart,
Color = color
});
newSectionStart = end;
}
}
if (insertionEndPos > newSectionStart)
{
this.Sections.Insert(pos++, new HighlightedSection {
Offset = newSectionStart,
Length = insertionEndPos - newSectionStart,
Color = color
});
newSectionStart = insertionEndPos;
}
}
/// <inheritdoc/>
public override void EndSpan()
{
currentColor = colorStack.Pop();
currentColorBegin = documentTextWriter.InsertionOffset;
}
/// <inheritdoc/>
public override void BeginSpan(HighlightingColor highlightingColor)
{
BeginColorSpan();
currentColor.MergeWith(highlightingColor);
currentColor.Freeze();
}
/// <summary>
/// Applies a highlighting color to a visual line element.
/// </summary>
protected virtual void ApplyColorToElement(VisualLineElement element, HighlightingColor color)
{
ApplyColorToElement(element, color, CurrentContext);
}
