private void RenderCaret(DrawingContext context)
{
var backgroundColor = (((Control)TemplatedParent).GetValue(BackgroundProperty) as SolidColorBrush)?.Color;
var caretBrush = Brushes.Black;
if (backgroundColor.HasValue)
{
var red = (byte)~backgroundColor.Value.R;
var green = (byte)~backgroundColor.Value.G;
var blue = (byte)~backgroundColor.Value.B;
caretBrush = new SolidColorBrush(Color.FromRgb(red, green, blue));
}
if (_caretBlink && CaretIndex != -1)
{
if (CaretIndex > TextDocument.TextLength)
{
CaretIndex = TextDocument.TextLength;
}
var charPos = VisualLineGeometryBuilder.GetViewPortPosition(this, CaretIndex);
var x = Math.Floor(charPos.X) + 0.5;
var y = Math.Floor(charPos.Y) + 0.5;
var b = Math.Ceiling(charPos.Bottom) - 0.5;
context.DrawLine(
new Pen(caretBrush, 1),
new Point(charPos.TopLeft.X, charPos.TopLeft.Y),
new Point(charPos.TopLeft.X, charPos.BottomLeft.Y));
}
}
public void Draw(TextView textView, DrawingContext drawingContext)
{
if (textView.SelectionStart != textView.SelectionEnd && textView.SelectionEnd >= 0 && textView.SelectionStart >= 0)
{
TextSegment selection;
if (textView.SelectionEnd > textView.SelectionStart)
{
selection = new TextSegment {
StartOffset = textView.SelectionStart, EndOffset = textView.SelectionEnd
};
}
else
{
selection = new TextSegment {
StartOffset = textView.SelectionEnd, EndOffset = textView.SelectionStart
};
}
var rects = VisualLineGeometryBuilder.GetRectsForSegment(textView, selection);
foreach (var rect in rects)
{
drawingContext.FillRectangle(selectionBrush, rect);
}
}
}
public void TransformLine(TextView textView, DrawingContext drawingContext, VisualLine line)
{
if (!string.IsNullOrEmpty(SelectedWord) && line.RenderedText.Text.Contains(SelectedWord))
{
var startIndex = 0;
while (startIndex != -1)
{
startIndex = line.RenderedText.Text.IndexOf(SelectedWord, startIndex);
if (startIndex != -1)
{
var rect =
VisualLineGeometryBuilder.GetRectsForSegment(textView,
new TextSegment
{
StartOffset = startIndex + line.Offset,
EndOffset = startIndex + line.Offset + SelectedWord.Length
}).First();
drawingContext.FillRectangle(highlightBrush, rect);
startIndex += SelectedWord.Length;
}
}
}
}
public void TransformLine(TextView textView, DrawingContext drawingContext, VisualLine line)
{
if (markers == null)
{
return;
}
var markersInLine = markers.FindOverlappingSegments(line);
foreach (var marker in markersInLine)
{
if (marker.Length == 0)
{
var endoffset = TextUtilities.GetNextCaretPosition(textView.TextDocument, marker.StartOffset,
TextUtilities.LogicalDirection.Forward, TextUtilities.CaretPositioningMode.WordBorderOrSymbol);
if (endoffset == -1)
{
marker.Length = line.Length;
}
else
{
marker.EndOffset = endoffset;
}
}
if (marker.EndOffset < textView.TextDocument.TextLength)
{
foreach (var r in VisualLineGeometryBuilder.GetRectsForSegment(textView, marker))
{
var startPoint = r.BottomLeft;
var endPoint = r.BottomRight;
var usedPen = new Pen(new SolidColorBrush(marker.MarkerColor), 1);
const double offset = 2.5;
var count = Math.Max((int)((endPoint.X - startPoint.X) / offset) + 1, 4);
var geometry = new StreamGeometry();
using (var ctx = geometry.Open())
{
ctx.BeginFigure(startPoint, false);
foreach (var point in CreatePoints(startPoint, endPoint, offset, count))
{
ctx.LineTo(point);
}
ctx.EndFigure(false);
}
drawingContext.DrawGeometry(Brushes.Transparent, usedPen, geometry);
break;
}
}
}
}
public void Draw(TextView textView, DrawingContext drawingContext)
{
if (line > 0 && line < textView.TextDocument.LineCount)
{
var currentLine = textView.TextDocument.GetLineByNumber(line);
var rects = VisualLineGeometryBuilder.GetRectsForSegment(textView, currentLine);
foreach (var rect in rects)
{
var drawRect = new Rect(rect.TopLeft.X, rect.TopLeft.Y, textView.Bounds.Width, rect.Height);
drawingContext.FillRectangle(selectedLineBg, drawRect);
}
}
}
public void Draw(TextView textView, DrawingContext drawingContext)
{
if (textView.SelectionStart == textView.SelectionEnd && textView.CaretIndex != -1 &&
textView.CaretIndex <= textView.TextDocument.TextLength)
{
var currentLine = textView.TextDocument.GetLineByOffset(textView.CaretIndex);
var rects = VisualLineGeometryBuilder.GetRectsForSegment(textView, currentLine);
foreach (var rect in rects)
{
var drawRect = new Rect(rect.TopLeft.X, rect.TopLeft.Y, textView.Bounds.Width, rect.Height);
drawingContext.FillRectangle(selectedLineBg, drawRect);
}
}
}
