public TextLine GetTextForNonPrintableCharacter(string text, ITextRunConstructionContext context)
{
if (nonPrintableCharacterTexts == null)
nonPrintableCharacterTexts = new Dictionary<string, TextLine>();
TextLine textLine;
if (!nonPrintableCharacterTexts.TryGetValue(text, out textLine)) {
var p = new VisualLineElementTextRunProperties(context.GlobalTextRunProperties);
p.SetForegroundBrush(context.TextView.NonPrintableCharacterBrush);
if (formatter == null)
formatter = TextFormatterFactory.Create(context.TextView);
textLine = FormattedTextElement.PrepareText(formatter, text, p);
nonPrintableCharacterTexts[text] = textLine;
}
return textLine;
}
public override VisualLineElement ConstructElement(int offset)
{
char c = CurrentContext.Document.GetCharAt(offset);
if (ShowSpaces && c == ' ') {
return new SpaceTextElement(CurrentContext.TextView.cachedElements.GetTextForNonPrintableCharacter("\u00B7", CurrentContext));
} else if (ShowTabs && c == '\t') {
return new TabTextElement(CurrentContext.TextView.cachedElements.GetTextForNonPrintableCharacter("\u00BB", CurrentContext));
} else if (ShowBoxForControlCharacters && char.IsControl(c)) {
var p = new VisualLineElementTextRunProperties(CurrentContext.GlobalTextRunProperties);
p.SetForegroundBrush(Brushes.White);
var textFormatter = TextFormatterFactory.Create(CurrentContext.TextView);
var text = FormattedTextElement.PrepareText(textFormatter,
TextUtilities.GetControlCharacterName(c), p);
return new SpecialCharacterBoxElement(text);
} else {
return null;
}
}
internal void SetTextRunProperties(VisualLineElementTextRunProperties p)
{
this.TextRunProperties = p;
}
/// <inheritdoc/>
public override VisualLineElement ConstructElement(int offset)
{
if (foldingManager == null)
return null;
int foldedUntil = -1;
FoldingSection foldingSection = null;
foreach (FoldingSection fs in foldingManager.GetFoldingsContaining(offset)) {
if (fs.IsFolded) {
if (fs.EndOffset > foldedUntil) {
foldedUntil = fs.EndOffset;
foldingSection = fs;
}
}
}
if (foldedUntil > offset && foldingSection != null) {
// Handle overlapping foldings: if there's another folded folding
// (starting within the foldingSection) that continues after the end of the folded section,
// then we'll extend our fold element to cover that overlapping folding.
bool foundOverlappingFolding;
do {
foundOverlappingFolding = false;
foreach (FoldingSection fs in FoldingManager.GetFoldingsContaining(foldedUntil)) {
if (fs.IsFolded && fs.EndOffset > foldedUntil) {
foldedUntil = fs.EndOffset;
foundOverlappingFolding = true;
}
}
} while (foundOverlappingFolding);
string title = foldingSection.Title;
if (string.IsNullOrEmpty(title))
title = "...";
var p = new VisualLineElementTextRunProperties(CurrentContext.GlobalTextRunProperties);
p.SetForegroundBrush(textBrush);
var textFormatter = TextFormatterFactory.Create(CurrentContext.TextView);
var text = FormattedTextElement.PrepareText(textFormatter, title, p);
return new FoldingLineElement(foldingSection, text, foldedUntil - offset) { textBrush = textBrush };
} else {
return null;
}
}