/// <summary>
/// Draws a single <see cref="LineNumberItem"/>.
/// </summary>
/// <param name="item"></param>
/// <param name="graphics">The <see cref="Graphics"/> to draw on.</param>
/// <param name="brush"></param>
/// <param name="textFormat"></param>
/// <param name="path">The <see cref="GraphicsPath"/> to update with the drawn data.</param>
private void DrawLineNumber(LineNumberItem item, Graphics graphics, Brush brush, StringFormat textFormat, GraphicsPath path)
{
var text = _lineNumbersShowAsHexadecimal
? item.LineNumber.ToString("X")
: _lineNumbersShowLeadingZeroes
? item.LineNumber.ToString(_lineNumbersFormat)
: item.LineNumber.ToString();
var textSize = graphics.MeasureString(text, Font, new Point(0, 0), textFormat);
var point = GetLineNumberDrawingStartPoint(item, textSize);
// TextClipping
var itemClipRectangle = new RectangleF(point, textSize.ToSize());
if (_lineNumbersClipByItemRectangle)
{
// If selected, the text will be clipped so that it doesn't spill out of its own LineNumberItem-area.
// Only the part of the text inside the LineNumberItem.Rectangle should be visible, so intersect with the ItemRectangle
// The SetClip method temporary restricts the drawing area of the control for whatever is drawn next.
itemClipRectangle.Intersect(item.Rectangle);
graphics.SetClip(itemClipRectangle);
}
// TextDrawing
graphics.DrawString(text, Font, brush, point, textFormat);
graphics.ResetClip();
// The GraphicsPath for the LineNumber is just a rectangle behind the text, to keep the paintingspeed high and avoid ugly artifacts.
path.AddRectangle(itemClipRectangle);
path.CloseFigure();
}
/// <summary>
/// Draws a grid for the specified <see cref="LineNumberItem"/>.
/// </summary>
/// <param name="item"></param>
/// <param name="graphics">The <see cref="Graphics"/> to draw on.</param>
/// <param name="pen"></param>
/// <param name="path">The <see cref="GraphicsPath"/> to update with the drawn data.</param>
private void DrawGridLines(LineNumberItem item, Graphics graphics, Pen pen, GraphicsPath path)
{
graphics.DrawLine(pen, new PointF(0, item.Rectangle.Y), new PointF(Width, item.Rectangle.Y));
// Every item in a GraphicsPath is a closed figure, so instead of adding gridlines as lines, we'll add them
// as rectangles that loop out of sight. Their height uses the zContentRectangle which is the maxsize of
// the ParentRichTextBox's contents.
//
// Slight adjustment needed when the first item has a negative Y coordinate.
// This explains the " - zLNIs(0).Rectangle.Y" (which adds the negative size to the height
// to make sure the rectangle's bottompart stays out of sight)
path.AddRectangle(new RectangleF(-_gridLinesThickness,
item.Rectangle.Y,
Width + _gridLinesThickness * 2,
Height - item.Rectangle.Y + _gridLinesThickness));
path.CloseFigure();
}
/// <summary>
/// Gets the point where the specified <see cref="LineNumberItem"/> should be drawn.
/// The return value is based on <see cref="Alignment"/>, <paramref name="textSize"/>, and <paramref name="item.Rectangle"/>.
/// </summary>
/// <param name="item"></param>
/// <param name="textSize"></param>
/// <returns></returns>
private PointF GetLineNumberDrawingStartPoint(LineNumberItem item, SizeF textSize)
{
if (_lineNumbersAlignment == ContentAlignment.TopLeft)
{
return(new PointF(item.Rectangle.Left + Padding.Left + _lineNumbersOffset.Width, item.Rectangle.Top + Padding.Top + _lineNumbersOffset.Height));
}
if (_lineNumbersAlignment == ContentAlignment.MiddleLeft)
{
return(new PointF(item.Rectangle.Left + Padding.Left + _lineNumbersOffset.Width, item.Rectangle.Top + (item.Rectangle.Height / 2) + _lineNumbersOffset.Height - textSize.Height / 2));
}
if (_lineNumbersAlignment == ContentAlignment.BottomLeft)
{
return(new PointF(item.Rectangle.Left + Padding.Left + _lineNumbersOffset.Width, item.Rectangle.Bottom - Padding.Bottom + 1 + _lineNumbersOffset.Height - textSize.Height));
}
if (_lineNumbersAlignment == ContentAlignment.TopCenter)
{
return(new PointF(item.Rectangle.Width / 2 + _lineNumbersOffset.Width - textSize.Width / 2, item.Rectangle.Top + Padding.Top + _lineNumbersOffset.Height));
}
if (_lineNumbersAlignment == ContentAlignment.MiddleCenter)
{
return(new PointF(item.Rectangle.Width / 2 + _lineNumbersOffset.Width - textSize.Width / 2, item.Rectangle.Top + (item.Rectangle.Height / 2) + _lineNumbersOffset.Height - textSize.Height / 2));
}
if (_lineNumbersAlignment == ContentAlignment.BottomCenter)
{
return(new PointF(item.Rectangle.Width / 2 + _lineNumbersOffset.Width - textSize.Width / 2, item.Rectangle.Bottom - Padding.Bottom + 1 + _lineNumbersOffset.Height - textSize.Height));
}
if (_lineNumbersAlignment == ContentAlignment.TopRight)
{
return(new PointF(item.Rectangle.Right - Padding.Right + _lineNumbersOffset.Width - textSize.Width, item.Rectangle.Top + Padding.Top + _lineNumbersOffset.Height));
}
if (_lineNumbersAlignment == ContentAlignment.MiddleRight)
{
return(new PointF(item.Rectangle.Right - Padding.Right + _lineNumbersOffset.Width - textSize.Width, item.Rectangle.Top + (item.Rectangle.Height / 2) + _lineNumbersOffset.Height - textSize.Height / 2));
}
if (_lineNumbersAlignment == ContentAlignment.BottomRight)
{
return(new PointF(item.Rectangle.Right - Padding.Right + _lineNumbersOffset.Width - textSize.Width, item.Rectangle.Bottom - Padding.Bottom + 1 + _lineNumbersOffset.Height - textSize.Height));
}
return(new PointF(0, 0));
}
/// <summary>
/// Draws a single <see cref="LineNumberItem"/>.
/// </summary>
/// <param name="item"></param>
/// <param name="graphics">The <see cref="Graphics"/> to draw on.</param>
/// <param name="brush"></param>
/// <param name="textFormat"></param>
/// <param name="path">The <see cref="GraphicsPath"/> to update with the drawn data.</param>
private void DrawLineNumber(LineNumberItem item, Graphics graphics, Brush brush, StringFormat textFormat, GraphicsPath path)
{
var text = _lineNumbersShowAsHexadecimal
? item.LineNumber.ToString("X")
: _lineNumbersShowLeadingZeroes
? item.LineNumber.ToString(_lineNumbersFormat)
: item.LineNumber.ToString();
var textSize = graphics.MeasureString(text, Font, new Point(0, 0), textFormat);
var point = GetLineNumberDrawingStartPoint(item, textSize);
// TextClipping
var itemClipRectangle = new RectangleF(point, textSize.ToSize());
if (_lineNumbersClipByItemRectangle)
{
// If selected, the text will be clipped so that it doesn't spill out of its own LineNumberItem-area.
// Only the part of the text inside the LineNumberItem.Rectangle should be visible, so intersect with the ItemRectangle
// The SetClip method temporary restricts the drawing area of the control for whatever is drawn next.
itemClipRectangle.Intersect(item.Rectangle);
graphics.SetClip(itemClipRectangle);
}
// TextDrawing
graphics.DrawString(text, Font, brush, point, textFormat);
graphics.ResetClip();
// The GraphicsPath for the LineNumber is just a rectangle behind the text, to keep the paintingspeed high and avoid ugly artifacts.
path.AddRectangle(itemClipRectangle);
path.CloseFigure();
}
/// <summary>
/// Draws a grid for the specified <see cref="LineNumberItem"/>.
/// </summary>
/// <param name="item"></param>
/// <param name="graphics">The <see cref="Graphics"/> to draw on.</param>
/// <param name="pen"></param>
/// <param name="path">The <see cref="GraphicsPath"/> to update with the drawn data.</param>
private void DrawGridLines(LineNumberItem item, Graphics graphics, Pen pen, GraphicsPath path)
{
graphics.DrawLine(pen, new PointF(0, item.Rectangle.Y), new PointF(Width, item.Rectangle.Y));
// Every item in a GraphicsPath is a closed figure, so instead of adding gridlines as lines, we'll add them
// as rectangles that loop out of sight. Their height uses the zContentRectangle which is the maxsize of
// the ParentRichTextBox's contents.
//
// Slight adjustment needed when the first item has a negative Y coordinate.
// This explains the " - zLNIs(0).Rectangle.Y" (which adds the negative size to the height
// to make sure the rectangle's bottompart stays out of sight)
path.AddRectangle(new RectangleF(-_gridLinesThickness,
item.Rectangle.Y,
Width + _gridLinesThickness*2,
Height - item.Rectangle.Y + _gridLinesThickness));
path.CloseFigure();
}
/// <summary>
/// Draws a gradient for the specified <see cref="LineNumberItem"/>.
/// </summary>
/// <param name="item"></param>
/// <param name="graphics">The <see cref="Graphics"/> to draw on.</param>
private void DrawGradient(LineNumberItem item, Graphics graphics)
{
using (var gradientBrush
= new LinearGradientBrush(item.Rectangle, _gradientStarColor, _gradientEndColor, _gradientDirection))
graphics.FillRectangle(gradientBrush, item.Rectangle);
}
/// <summary>
/// Gets the point where the specified <see cref="LineNumberItem"/> should be drawn.
/// The return value is based on <see cref="Alignment"/>, <paramref name="textSize"/>, and <paramref name="item.Rectangle"/>.
/// </summary>
/// <param name="item"></param>
/// <param name="textSize"></param>
/// <returns></returns>
private PointF GetLineNumberDrawingStartPoint(LineNumberItem item, SizeF textSize)
{
if (_lineNumbersAlignment == ContentAlignment.TopLeft)
return new PointF(item.Rectangle.Left + Padding.Left + _lineNumbersOffset.Width, item.Rectangle.Top + Padding.Top + _lineNumbersOffset.Height);
if (_lineNumbersAlignment == ContentAlignment.MiddleLeft)
return new PointF(item.Rectangle.Left + Padding.Left + _lineNumbersOffset.Width, item.Rectangle.Top + (item.Rectangle.Height / 2) + _lineNumbersOffset.Height - textSize.Height / 2);
if (_lineNumbersAlignment == ContentAlignment.BottomLeft)
return new PointF(item.Rectangle.Left + Padding.Left + _lineNumbersOffset.Width, item.Rectangle.Bottom - Padding.Bottom + 1 + _lineNumbersOffset.Height - textSize.Height);
if (_lineNumbersAlignment == ContentAlignment.TopCenter)
return new PointF(item.Rectangle.Width / 2 + _lineNumbersOffset.Width - textSize.Width / 2, item.Rectangle.Top + Padding.Top + _lineNumbersOffset.Height);
if (_lineNumbersAlignment == ContentAlignment.MiddleCenter)
return new PointF(item.Rectangle.Width / 2 + _lineNumbersOffset.Width - textSize.Width / 2, item.Rectangle.Top + (item.Rectangle.Height / 2) + _lineNumbersOffset.Height - textSize.Height / 2);
if (_lineNumbersAlignment == ContentAlignment.BottomCenter)
return new PointF(item.Rectangle.Width / 2 + _lineNumbersOffset.Width - textSize.Width / 2, item.Rectangle.Bottom - Padding.Bottom + 1 + _lineNumbersOffset.Height - textSize.Height);
if (_lineNumbersAlignment == ContentAlignment.TopRight)
return new PointF(item.Rectangle.Right - Padding.Right + _lineNumbersOffset.Width - textSize.Width, item.Rectangle.Top + Padding.Top + _lineNumbersOffset.Height);
if (_lineNumbersAlignment == ContentAlignment.MiddleRight)
return new PointF(item.Rectangle.Right - Padding.Right + _lineNumbersOffset.Width - textSize.Width, item.Rectangle.Top + (item.Rectangle.Height / 2) + _lineNumbersOffset.Height - textSize.Height / 2);
if (_lineNumbersAlignment == ContentAlignment.BottomRight)
return new PointF(item.Rectangle.Right - Padding.Right + _lineNumbersOffset.Width - textSize.Width, item.Rectangle.Bottom - Padding.Bottom + 1 + _lineNumbersOffset.Height - textSize.Height);
return new PointF(0, 0);
}
/// <summary>
/// Draws a gradient for the specified <see cref="LineNumberItem"/>.
/// </summary>
/// <param name="item"></param>
/// <param name="graphics">The <see cref="Graphics"/> to draw on.</param>
private void DrawGradient(LineNumberItem item, Graphics graphics)
{
using (var gradientBrush
= new LinearGradientBrush(item.Rectangle, _gradientStarColor, _gradientEndColor, _gradientDirection))
graphics.FillRectangle(gradientBrush, item.Rectangle);
}
