public override void Paint(Graphics g, Rectangle rect)
{
var totalWidth = Size.Width;
var leftWidth = (int)(totalWidth / 2.0);
var rightWidth = rect.Width - leftWidth;
var fontHeight = textArea.TextView.FontHeight;
var lineNumberPainterColor = textArea.Document.HighlightingStrategy.GetColorFor("LineNumbers");
var fillBrush = textArea.Enabled ? BrushRegistry.GetBrush(lineNumberPainterColor.BackgroundColor) : SystemBrushes.InactiveBorder;
var drawBrush = BrushRegistry.GetBrush(lineNumberPainterColor.Color);
for (var y = 0; y < ((DrawingPosition.Height + textArea.TextView.VisibleLineDrawingRemainder) / fontHeight) + 1; ++y)
{
var ypos = drawingPosition.Y + (fontHeight * y) - textArea.TextView.VisibleLineDrawingRemainder;
var backgroundRectangle = new Rectangle(drawingPosition.X, ypos, drawingPosition.Width, fontHeight);
if (!rect.IntersectsWith(backgroundRectangle))
{
continue;
}
g.FillRectangle(fillBrush, backgroundRectangle);
var curLine = textArea.Document.GetFirstLogicalLine(textArea.Document.GetVisibleLine(textArea.TextView.FirstVisibleLine) + y);
if (curLine >= textArea.Document.TotalNumberOfLines)
{
continue;
}
if (!DiffLines.ContainsKey(curLine + 1))
{
continue;
}
var diffLine = DiffLines[curLine + 1];
if (diffLine.Style != DiffLineNum.DiffLineStyle.Context)
{
var brush = default(Brush);
switch (diffLine.Style)
{
case DiffLineNum.DiffLineStyle.Plus:
brush = new SolidBrush(AppSettings.DiffAddedColor);
break;
case DiffLineNum.DiffLineStyle.Minus:
brush = new SolidBrush(AppSettings.DiffRemovedColor);
break;
case DiffLineNum.DiffLineStyle.Header:
brush = new SolidBrush(AppSettings.DiffSectionColor);
break;
}
Debug.Assert(brush != null, string.Format("brush != null, unknow diff line style {0}", diffLine.Style));
g.FillRectangle(brush, new Rectangle(0, backgroundRectangle.Top, leftWidth, backgroundRectangle.Height));
g.FillRectangle(brush, new Rectangle(leftWidth, backgroundRectangle.Top, rightWidth, backgroundRectangle.Height));
}
if (diffLine.LeftLineNum != DiffLineNum.NotApplicableLineNum)
{
g.DrawString(diffLine.LeftLineNum.ToString(),
lineNumberPainterColor.GetFont(TextEditorProperties.FontContainer),
drawBrush,
new Point(TextHorizontalMargin, backgroundRectangle.Top));
}
if (diffLine.RightLineNum != DiffLineNum.NotApplicableLineNum)
{
g.DrawString(diffLine.RightLineNum.ToString(),
lineNumberPainterColor.GetFont(TextEditorProperties.FontContainer),
drawBrush,
new Point(TextHorizontalMargin + (totalWidth / 2), backgroundRectangle.Top));
}
}
}
protected override void OnRender(DrawingContext drawingContext)
{
if (!DiffLines.Any())
{
return;
}
var totalWidth = GetRequiredWidth();
var leftWidth = totalWidth / 2.0;
var rightWidth = ActualWidth - leftWidth;
var visualLines = TextView.VisualLinesValid ? TextView.VisualLines : Enumerable.Empty <VisualLine>();
foreach (var line in visualLines)
{
var rect = BackgroundGeometryBuilder.GetRectsFromVisualSegment(TextView, line,
0, 1000).ToArray();
var lineNumber = line.FirstDocumentLine.LineNumber;
if (DiffLines.ContainsKey(lineNumber))
{
var diffLine = DiffLines[lineNumber];
if (diffLine.Style != DiffLineNum.DiffLineStyle.Context)
{
var brush = default(Brush);
switch (diffLine.Style)
{
case DiffLineNum.DiffLineStyle.Plus:
brush = new SolidColorBrush(HighlighterHelper.PlusLineColor);
break;
case DiffLineNum.DiffLineStyle.Minus:
brush = new SolidColorBrush(HighlighterHelper.MinusLineColor);
break;
case DiffLineNum.DiffLineStyle.Header:
brush = new SolidColorBrush(HighlighterHelper.HeaderLineColor);
break;
}
foreach (var rc in rect)
{
drawingContext.DrawRectangle(brush, NullPen, new Rect(0.0, rc.Top, leftWidth, rc.Height));
drawingContext.DrawRectangle(brush, NullPen, new Rect(leftWidth, rc.Top, rightWidth, rc.Height));
}
}
var emSize = (double)GetValue(TextBlock.FontSizeProperty);
if (diffLine.LeftLineNum != DiffLineNum.NotApplicableLineNum)
{
var ft = new FormattedText(diffLine.LeftLineNum.ToString(),
CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
TypeFace, emSize, Brushes.Black);
drawingContext.DrawText(ft, new Point(TextHorizontalMargin, rect[0].Top));
}
if (diffLine.RightLineNum != DiffLineNum.NotApplicableLineNum)
{
var ft = new FormattedText(diffLine.RightLineNum.ToString(),
CultureInfo.CurrentCulture, FlowDirection.LeftToRight,
TypeFace, emSize, Brushes.Black);
drawingContext.DrawText(ft, new Point(TextHorizontalMargin + totalWidth / 2, rect[0].Top));
}
}
}
}
