protected override void OnRender(DrawingContext drawingContext)
{
Debug.Print("DiffControl OnRender");
#if DEBUG
MeasureRendeTime();
#endif
// Fill background
drawingContext.DrawRectangle(AppSettings.FullMatchBackground, null, new Rect(0, 0, this.ActualWidth, this.ActualHeight));
if (Lines.Count == 0)
{
return;
}
typeface = new Typeface(this.FontFamily, this.FontStyle, this.FontWeight, this.FontStretch);
Matrix m = PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice;
dpiScale = 1 / m.M11;
TextUtils.CreateGlyphRun("W", typeface, this.FontSize, dpiScale, out characterWidth);
characterHeight = Math.Ceiling(TextUtils.FontHeight(typeface, this.FontSize, dpiScale) / dpiScale) * dpiScale;
Brush activeDiffBrush = new SolidColorBrush(Color.FromRgb(220, 220, 220));
activeDiffBrush.Freeze();
Pen borderPen = new Pen(SystemColors.ScrollBarBrush, RoundToWholePixels(1));
borderPen.Freeze();
GuidelineSet borderGuide = CreateGuidelineSet(borderPen);
textMargin = RoundToWholePixels(4);
lineNumberMargin = RoundToWholePixels(characterWidth * Lines.Count.ToString().Length) + (2 * textMargin) + borderPen.Thickness;
VisibleLines = (int)(ActualHeight / characterHeight + 1);
MaxVerialcalScroll = Lines.Count - VisibleLines + 1;
drawingContext.DrawRectangle(SystemColors.ControlBrush, null, new Rect(0, 0, lineNumberMargin, this.ActualHeight));
for (int i = 0; i < VisibleLines; i++)
{
int lineIndex = i + VerticalOffset;
if (lineIndex >= Lines.Count)
{
break;
}
Line line = Lines[lineIndex];
// Line Y offset
drawingContext.PushTransform(new TranslateTransform(0, characterHeight * i));
{
// Draw line number
SolidColorBrush lineNumberColor = SystemColors.ControlDarkBrush;
if (lineIndex >= CurrentDiff && lineIndex < CurrentDiff + CurrentDiffLength && !Edited)
{
lineNumberColor = SystemColors.ControlDarkDarkBrush;
drawingContext.DrawRectangle(activeDiffBrush, null, new Rect(0, 0, lineNumberMargin, characterHeight));
}
// Draw line background
if (line.Type != TextState.FullMatch)
{
drawingContext.DrawRectangle(line.BackgroundBrush, null, new Rect(lineNumberMargin, 0, Math.Max(this.ActualWidth - lineNumberMargin, 0), characterHeight));
}
if (line.LineIndex != null)
{
GlyphRun rowNumberRun = line.GetRenderedLineIndexText(typeface, this.FontSize, dpiScale, out double rowNumberWidth);
drawingContext.PushTransform(new TranslateTransform(lineNumberMargin - rowNumberWidth - textMargin - borderPen.Thickness, 0));
drawingContext.DrawGlyphRun(lineNumberColor, rowNumberRun);
drawingContext.Pop();
}
// Text clipping rect
drawingContext.PushClip(new RectangleGeometry(new Rect(lineNumberMargin + textMargin, 0, Math.Max(ActualWidth - lineNumberMargin - textMargin * 2, 0), ActualHeight)));
{
// Line X offset
drawingContext.PushTransform(new TranslateTransform(lineNumberMargin + textMargin - HorizontalOffset, 0));
{
// Draw line
if (line.Text != "")
{
double nextPosition = 0;
foreach (TextSegment textSegment in line.TextSegments)
{
drawingContext.PushTransform(new TranslateTransform(nextPosition, 0));
GlyphRun segmentRun = textSegment.GetRenderedText(typeface, this.FontSize, dpiScale, AppSettings.ShowWhiteSpaceCharacters, AppSettings.TabSize, out double runWidth);
if (nextPosition - HorizontalOffset < ActualWidth && nextPosition + runWidth - HorizontalOffset > 0)
{
if (line.Type != textSegment.Type && AppSettings.ShowLineChanges)
{
drawingContext.DrawRectangle(textSegment.BackgroundBrush, null, new Rect(nextPosition == 0 ? -textMargin : 0, 0, runWidth + (nextPosition == 0 ? textMargin : 0), characterHeight));
}
drawingContext.DrawGlyphRun(AppSettings.ShowLineChanges ? textSegment.ForegroundBrush : line.ForegroundBrush, segmentRun);
}
nextPosition += runWidth;
drawingContext.Pop();
}
maxTextwidth = Math.Max(maxTextwidth, nextPosition);
}
// Draw cursor
if (EditMode && this.IsFocused && cursorLine == lineIndex && cursorBlink)
{
drawingContext.DrawRectangle(Brushes.Black, null, new Rect(CharacterPosition(lineIndex, cursorCharacter), 0, RoundToWholePixels(1), characterHeight));
}
}
drawingContext.Pop(); // Line X offset
}
drawingContext.Pop(); // Text clipping rect
// Text area clipping rect
drawingContext.PushClip(new RectangleGeometry(new Rect(lineNumberMargin, 0, Math.Max(ActualWidth - lineNumberMargin, 0), ActualHeight)));
{
// Line X offset 2
drawingContext.PushTransform(new TranslateTransform(lineNumberMargin + textMargin - HorizontalOffset, 0));
{
// Draw selection
if (Selection != null && lineIndex >= Selection.TopLine && lineIndex <= Selection.BottomLine)
{
Rect selectionRect = new Rect(0 - textMargin + HorizontalOffset, 0, this.ActualWidth + HorizontalOffset, characterHeight);
if (Selection.TopLine == lineIndex && Selection.TopCharacter > 0)
{
selectionRect.X = Math.Max(0, CharacterPosition(lineIndex, Selection.TopCharacter));
}
if (Selection.BottomLine == lineIndex)
{
selectionRect.Width = Math.Max(0, CharacterPosition(lineIndex, Selection.BottomCharacter) - selectionRect.X);
}
drawingContext.DrawRectangle(AppSettings.SelectionBackground, null, selectionRect);
}
}
drawingContext.Pop(); // Line X offset 2
}
drawingContext.Pop(); // Text area clipping rect
}
drawingContext.Pop(); // Line Y offset
}
// Draw line number border
drawingContext.PushGuidelineSet(borderGuide);
{
drawingContext.DrawLine(borderPen, new Point(lineNumberMargin, -1), new Point(lineNumberMargin, this.ActualHeight));
}
drawingContext.Pop();
TextAreaWidth = (int)(ActualWidth - lineNumberMargin - (textMargin * 2));
MaxHorizontalScroll = (int)(maxTextwidth - TextAreaWidth + textMargin);
#if DEBUG
ReportRenderTime();
#endif
}
