/// <summary>
/// The first part of the split version of Display decorations.
/// </summary>
/// <param name="visiblePair">The pair representing the first character of the Visible text with respect to the whole text</param>
/// <param name="decorations">The List of Decorations</param>
/// <returns></returns>
private Dictionary <EDecorationType, Dictionary <Decoration, List <Geometry> > > GeneratePreparedDecorations(Pair visiblePair, List <Decoration> decorations)
{
Dictionary <EDecorationType, Dictionary <Decoration, List <Geometry> > > preparedDecorations = new Dictionary <EDecorationType, Dictionary <Decoration, List <Geometry> > >();
Dictionary <Decoration, List <Geometry> > hilightgeometryDictionary = PrepareGeometries(visiblePair, formattedText, decorations, EDecorationType.Hilight, HilightGeometryMaker);
preparedDecorations.Add(EDecorationType.Hilight, hilightgeometryDictionary);
Dictionary <Decoration, List <Geometry> > strikethroughGeometryDictionary = PrepareGeometries(visiblePair, formattedText, decorations, EDecorationType.Strikethrough, StrikethroughGeometryMaker);
preparedDecorations.Add(EDecorationType.Strikethrough, strikethroughGeometryDictionary);
Dictionary <Decoration, List <Geometry> > underlineGeometryDictionary = PrepareGeometries(visiblePair, formattedText, decorations, EDecorationType.Underline, UnderlineGeometryMaker);
preparedDecorations.Add(EDecorationType.Underline, underlineGeometryDictionary);
return(preparedDecorations);
}
/// <summary>
/// 实现了Hilight类型的文本装饰
/// </summary>
/// <param name="text">待装饰的文本</param>
/// <param name="p">待装饰的区域</param>
/// <returns></returns>
private Geometry HilightGeometryMaker(FormattedText text, Pair p)
{
return(text.BuildHighlightGeometry(new Point(0, 0), p.Start, p.Length));
}
/// <summary>
/// 主要渲染逻辑
/// </summary>
/// <param name="drawingContext"></param>
protected void OnRenderRuntime(DrawingContext drawingContext)
{
drawingContext.PushClip(new RectangleGeometry(new Rect(0, 0, this.ActualWidth, this.ActualHeight))); // 限定绘制区域
drawingContext.DrawRectangle(CodeBoxBackground, null, new Rect(0, 0, this.ActualWidth, this.ActualHeight)); // 绘制背景
// 绘制光标所在行的背景
Rect caretLineRect = GetRectFromCharacterIndex(this.CaretIndex);
caretLineRect.X = LineNumberMarginWidth;
caretLineRect.Width = this.ActualWidth;
if (this.SelectionLength == 0)
{
drawingContext.DrawRectangle(null, new Pen(CaretLineForeground, 2), caretLineRect);
}
int firstLine = GetFirstVisibleLineIndex();
int firstChar;
if (firstLine == 0)
{
firstChar = 0;
}
else
{
try
{
firstChar = GetCharacterIndexFromLineIndex(firstLine);
}
catch
{
firstChar = 0;
}
}
Point renderPoint = GetRenderPoint(firstChar);
// 绘制行号
if (ShowLineNumbers && this.LineNumberMarginWidth > 0)
{
if (this.GetLastVisibleLineIndex() != -1)
{
FormattedText lineNumbers = GenerateLineNumbers();
if (lineNumbers.Width + 6 > LineNumberMarginWidth)
{
LineNumberMarginWidth = lineNumbers.Width + 6;
}
drawingContext.DrawText(lineNumbers, new Point(3, renderPoint.Y));
renderinfo.LineNumbers = lineNumbers;
}
else
{
drawingContext.DrawText(renderinfo.LineNumbers, new Point(3, renderPoint.Y));
}
}
// if (this.Text == "") return;
string visibleText = VisibleText;
if (visibleText == null)
{
return;
}
formattedText = new FormattedText(
visibleText,
CultureInfo.GetCultureInfo("en-us"),
FlowDirection.LeftToRight,
new Typeface(this.FontFamily.Source),
this.FontSize,
BaseForeground);
formattedText.Trimming = TextTrimming.None;
ApplyTextWrapping(formattedText);
Pair visiblePair = new Pair(firstChar, visibleText.Length);
//Generates the prepared decorations for the BaseDecorations
Dictionary <EDecorationType, Dictionary <Decoration, List <Geometry> > > basePreparedDecorations
= GeneratePreparedDecorations(visiblePair, DecorationScheme.BaseDecorations);
//Displays the prepared decorations for the BaseDecorations
DisplayPreparedDecorations(drawingContext, basePreparedDecorations, renderPoint);
//Generates the prepared decorations for the Decorations
Dictionary <EDecorationType, Dictionary <Decoration, List <Geometry> > > preparedDecorations
= GeneratePreparedDecorations(visiblePair, mDecorations);
//Displays the prepared decorations for the Decorations
DisplayPreparedDecorations(drawingContext, preparedDecorations, renderPoint);
// 文本着色
ColorText(firstChar, DecorationScheme.BaseDecorations);
ColorText(firstChar, mDecorations);
drawingContext.DrawText(formattedText, renderPoint);
// 缓存渲染信息
renderinfo.BoxText = formattedText;
renderinfo.CaretLineRect = caretLineRect;
renderinfo.BasePreparedDecorations = basePreparedDecorations;
renderinfo.PreparedDecorations = preparedDecorations;
}