/// <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);
}
}
private void RefreshNonPrintableCharacterTexts()
{
// NOTE: 改行マークの変更
// 既定の改行マークは VisualLineTextSource.CreateTextRunForNewLine() でハードコーディングされている。
// private 関数のため変更できず、VisualLineTextSource は sealed クラスであり継承して誤魔化すこともできない。
// AvalonEdit では、画面描画にあたりこの改行マークを TextLine に変換しており、
// TextViewCachedElements.nonPrintableCharacterTexts の Dictionary を参照して変換先を生成する。
// ここを突き、nonPrintableCharacterTexts を書き換えることで、生成される TextLine を制御する。
var globalProterties = (TextRunProperties)typeof(ICSharpCode.AvalonEdit.Rendering.TextView)
.GetMethod("CreateGlobalTextRunProperties", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.InvokeMethod)
.Invoke(this, null);
var formatter = (TextFormatter)typeof(ICSharpCode.AvalonEdit.Rendering.TextView).Assembly
.GetType("ICSharpCode.AvalonEdit.Utils.TextFormatterFactory")
.GetMethod("Create", BindingFlags.Static | BindingFlags.Public | BindingFlags.InvokeMethod)
.Invoke(null, new[] { this });
var cachedElements = typeof(ICSharpCode.AvalonEdit.Rendering.TextView)
.GetField("cachedElements", BindingFlags.Instance | BindingFlags.NonPublic)
.GetValue(this);
var nonPrintableCharacterTexts = (Dictionary <string, TextLine>)cachedElements.GetType()
.GetField("nonPrintableCharacterTexts", BindingFlags.Instance | BindingFlags.NonPublic)
.GetValue(cachedElements);
var elementProperties = new VisualLineElementTextRunProperties(globalProterties);
elementProperties.SetForegroundBrush(this.NonPrintableCharacterBrush);
var cr = FormattedTextElement.PrepareText(formatter, this.VisualCharacterCR, elementProperties);
var lf = FormattedTextElement.PrepareText(formatter, this.VisualCharacterLF, elementProperties);
var crlf = FormattedTextElement.PrepareText(formatter, this.VisualCharacterCRLF, elementProperties);
nonPrintableCharacterTexts ??= new();
nonPrintableCharacterTexts["\\r"] = cr;
nonPrintableCharacterTexts["\\n"] = lf;
nonPrintableCharacterTexts["¶"] = crlf;
cachedElements.GetType()
.GetField("nonPrintableCharacterTexts", BindingFlags.Instance | BindingFlags.NonPublic)
.SetValue(cachedElements, nonPrintableCharacterTexts);
}
