protected override void OnDrawItem(DrawItemEventArgs e)
{
Graphics grfx = e.Graphics;
Rectangle rectColor = new Rectangle(e.Bounds.Left, e.Bounds.Top, 2 * e.Bounds.Height, e.Bounds.Height);
rectColor.Inflate(-1, -1);
Rectangle rectText = new Rectangle(e.Bounds.Left + 2 * e.Bounds.Height,
e.Bounds.Top,
e.Bounds.Width - 2 * e.Bounds.Height,
e.Bounds.Height);
if (this.Enabled)
{
e.DrawBackground();
}
//grfx.DrawRectangle(new Pen(e.ForeColor), rectColor);
DashStyleEx item = e.Index >= 0?(DashStyleEx)Items[e.Index] : DashStyleEx.Solid;
SolidBrush foreColorBrush = new SolidBrush(e.ForeColor);
Pen linePen = new Pen(foreColorBrush, (float)Math.Ceiling(0.125 * e.Bounds.Height));
item.SetPenDash(linePen);
grfx.DrawLine(linePen,
rectColor.Left, 0.5f * (rectColor.Top + rectColor.Bottom),
rectColor.Right, 0.5f * (rectColor.Top + rectColor.Bottom));
grfx.DrawString(item.ToString(), Font, foreColorBrush, rectText);
}
/// <summary>
/// Equivalence between the types <see cref="DashStyleEx"/> and <see cref="DashStyle"/>.
/// </summary>
/// <param name="style">One of the values in the enumeration <see cref="DashStyleEx"/> that represents style of dashed lines.</param>
/// <returns>
/// Equivalent value.
/// </returns>
public static DashStyle ToDashStyle(this DashStyleEx style)
{
DashStyle dashstyle = DashStyle.Solid;
switch (style)
{
case DashStyleEx.Dash:
dashstyle = DashStyle.Dash;
break;
case DashStyleEx.DashDot:
dashstyle = DashStyle.DashDot;
break;
case DashStyleEx.DashDotDot:
dashstyle = DashStyle.DashDotDot;
break;
case DashStyleEx.Dot:
dashstyle = DashStyle.Dot;
break;
}
return(dashstyle);
}
void SetDataSource(DashStyleEx selected)
{
if (_dashStyles == null)
{
SetDefaultValues();
}
if (!_dashStyles.Contains(selected))
{
_dashStyles.Add(selected.Clone());
}
this.BeginUpdate();
Items.Clear();
foreach (DashStyleEx o in _dashStyles)
{
Items.Add(o);
}
SelectedItem = selected;
this.EndUpdate();
}
public static ImageSource GetImage(DashStyleEx val)
{
const double height = 1;
const double width = 2;
const double lineWidth = height / 5;
DashStyle dashStyle = DashStyles.Solid;
if (val.IsKnownStyle)
{
if (val == DashStyleEx.Solid)
{
dashStyle = DashStyles.Solid;
}
else if (val == DashStyleEx.Dash)
{
dashStyle = DashStyles.Dash;
}
else if (val == DashStyleEx.Dot)
{
dashStyle = DashStyles.Dot;
}
else if (val == DashStyleEx.DashDot)
{
dashStyle = DashStyles.DashDot;
}
else if (val == DashStyleEx.DashDotDot)
{
dashStyle = DashStyles.DashDotDot;
}
else if (val == DashStyleEx.LongDash)
{
dashStyle = new DashStyle(new double[] { 5, 2 }, 0);
}
}
else if (val.IsCustomStyle)
{
var list = new List <double>();
foreach (var e in val.CustomStyle)
{
list.Add(e);
}
dashStyle = new DashStyle(list, 0);
}
// draws a transparent outline to fix the borders
var drawingGroup = new DrawingGroup();
var geometryDrawing = new GeometryDrawing
{
Geometry = new RectangleGeometry(new Rect(0, 0, width, height)),
Pen = new Pen(Brushes.Transparent, 0)
};
drawingGroup.Children.Add(geometryDrawing);
geometryDrawing = new GeometryDrawing()
{
Geometry = new LineGeometry(new Point(0, height / 2), new Point(width, height / 2))
};
geometryDrawing.Pen = new Pen(Brushes.Black, lineWidth)
{
DashStyle = dashStyle
};
drawingGroup.Children.Add(geometryDrawing);
var geometryImage = new DrawingImage(drawingGroup);
// Freeze the DrawingImage for performance benefits.
geometryImage.Freeze();
return(geometryImage);
}
public DashStyleComboBox(DashStyleEx selected)
: this()
{
SetDataSource(selected);
}
/// <summary>
/// Draw a centered line inside a rectangle with a specified color and style.
/// </summary>
/// <param name="rect"><see cref="RectangleF"/> structure that represents the source rectangle.</param>
/// <param name="graphics">A <see cref="Graphics"/> object used to draw.</param>
/// <param name="color">Line color.</param>
/// <param name="style">A value of the enumeration <see cref="DashStyleEx"/> that represents the style of the line</param>
/// <param name="width">Thickness of the line</param>
/// <exception cref="T:System.ArgumentNullException"><paramref name="graphics"/> is <b>null</b>.</exception>
public static void DrawCenterLine(this RectangleF rect, Graphics graphics, Color color, DashStyleEx style, int width)
{
SentinelHelper.ArgumentNull(graphics, nameof(graphics));
bool isValid = rect.IsValid();
if (!isValid)
{
return;
}
float y = rect.Y + rect.Height / 2;
using (Pen p = new Pen(color, width))
{
p.DashStyle = style.ToDashStyle();
graphics.DrawLine(p, rect.Left + 1, y, rect.Right - 1, y);
}
}
