internal void Render(Graphics g, RectangleF rectangle, PointF offset, IEnumerable <RTSelectionHighlight> highlights, bool unitsInMM)
{
List <Paragraph> rTParagraphs = RTParagraphs;
if (rTParagraphs == null || rTParagraphs.Count == 0)
{
return;
}
using (RevertingDeviceContext revertingDeviceContext = new RevertingDeviceContext(g, Dpi))
{
Win32DCSafeHandle hdc = revertingDeviceContext.Hdc;
if (highlights != null)
{
_ = RTTextbox.TextBoxProps.Direction;
foreach (RTSelectionHighlight highlight in highlights)
{
if (!HighlightStartLessThanOrEqualToEnd(highlight.SelectionStart, highlight.SelectionEnd))
{
TextBoxContext selectionStart = highlight.SelectionStart;
highlight.SelectionStart = highlight.SelectionEnd;
highlight.SelectionEnd = selectionStart;
}
TextRun run;
CaretInfo caretInfo = MapLocation(hdc, highlight.SelectionStart, relativeToRun: true, moveCaretToNextLine: true, out run);
TextRun run2;
CaretInfo caretInfo2 = MapLocation(hdc, highlight.SelectionEnd, relativeToRun: true, moveCaretToNextLine: true, out run2);
if (caretInfo != null && caretInfo2 != null && run != null && run2 != null)
{
SetHighlighting(rTParagraphs, hdc, highlight, run, run2, caretInfo.Position.X, caretInfo2.Position.X);
}
}
}
Rectangle rect = (!unitsInMM) ? Rectangle.Round(rectangle) : new Rectangle(TextBox.ConvertToPixels(rectangle.X, m_dpi), TextBox.ConvertToPixels(rectangle.Y, m_dpi), TextBox.ConvertToPixels(rectangle.Width, m_dpi), TextBox.ConvertToPixels(rectangle.Height, m_dpi));
revertingDeviceContext.XForm.Transform(ref rect);
Win32ObjectSafeHandle win32ObjectSafeHandle = Win32.CreateRectRgn(rect.Left - 1, rect.Top - 1, rect.Right + 1, rect.Bottom + 1);
if (!win32ObjectSafeHandle.IsInvalid)
{
try
{
if (Win32.SelectClipRgn(hdc, win32ObjectSafeHandle) == 0)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
}
finally
{
win32ObjectSafeHandle.Close();
}
}
TextBox.Render(RTTextbox, rTParagraphs, hdc, FontCache, offset, rectangle, m_dpi, unitsInMM);
if (Win32.SelectClipRgn(hdc, Win32ObjectSafeHandle.Zero) == 0)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
}
}
private CaretInfo MapLocation(Win32DCSafeHandle hdc, TextBoxContext location, bool relativeToRun, bool moveCaretToNextLine, out TextRun run)
{
CaretInfo caretInfo = null;
run = null;
int lineYOffset;
int lineHeight;
int textRunCharacterIndex;
bool isFirstLine;
bool isLastLine;
Point paragraphAndRunCoordinates = GetParagraphAndRunCoordinates(hdc, location, moveCaretToNextLine, out lineYOffset, out lineHeight, out run, out textRunCharacterIndex, out isFirstLine, out isLastLine);
if (run != null)
{
GlyphData glyphData = run.GlyphData;
GlyphShapeData glyphScriptShapeData = glyphData.GlyphScriptShapeData;
int piX = 0;
if (glyphData != null && run.CharacterCount > 0)
{
int num = Win32.ScriptCPtoX(textRunCharacterIndex, fTrailing: false, run.CharacterCount, glyphScriptShapeData.GlyphCount, glyphScriptShapeData.Clusters, glyphScriptShapeData.VisAttrs, glyphData.Advances, ref run.SCRIPT_ANALYSIS, ref piX);
if (Win32.Failed(num))
{
Marshal.ThrowExceptionForHR(num);
}
}
caretInfo = new CaretInfo();
CachedFont cachedFont = run.GetCachedFont(hdc, FontCache);
caretInfo.Height = cachedFont.GetHeight(hdc, FontCache);
caretInfo.Ascent = cachedFont.GetAscent(hdc, FontCache);
caretInfo.Descent = cachedFont.GetDescent(hdc, FontCache);
caretInfo.LineHeight = lineHeight;
caretInfo.LineYOffset = lineYOffset;
caretInfo.IsFirstLine = isFirstLine;
caretInfo.IsLastLine = isLastLine;
_ = RTParagraphs;
int y = paragraphAndRunCoordinates.Y - caretInfo.Ascent;
if (relativeToRun)
{
caretInfo.Position = new Point(piX, y);
}
else
{
caretInfo.Position = new Point(paragraphAndRunCoordinates.X + piX, y);
}
}
return(caretInfo);
}
