/// <inheritdoc/>
protected override Size MeasureOverride(Size availableSize)
{
typeface = this.CreateTypeface();
emSize = (double)GetValue(TextBlock.FontSizeProperty);
using (var text = TextFormatterFactory.CreateTextLine(
this,
new string('9', maxLineNumberLength),
typeface,
emSize,
(Brush)GetValue(Control.ForegroundProperty)
)) {
return(new Size(text.Width, 0));
}
}
/// <inheritdoc/>
protected override void OnRender(DrawingContext drawingContext)
{
TextView textView = this.TextView;
Size renderSize = this.RenderSize;
double w = renderSize.Width / maxLineNumberLength;
if (textView != null && textView.VisualLinesValid)
{
var foreground = (Brush)GetValue(Control.ForegroundProperty);
foreach (VisualLine line in textView.VisualLines)
{
int lineNumber = line.FirstDocumentLine.LineNumber;
using (var text = TextFormatterFactory.CreateTextLine(
this,
lineNumber.ToString(CultureInfo.CurrentCulture),
typeface, emSize, foreground
)) {
double y = line.GetTextLineVisualYPosition(line.TextLines[0], VisualYPosition.TextTop);
text.Draw(drawingContext, new Point(renderSize.Width - text.Width - w, y - textView.VerticalOffset), InvertAxes.None);
}
}
}
}