protected virtual void OnRenderThumb(PaintThumbEventArgs e)
{
Graphics g = e.Graphics;
Rectangle rect = e.ClipRectangle;
ControlState state = e.ControlState;
ThumbArrowDirection direction = ThumbArrowDirection.None;
Color begin = ColorTable.ThumbBackNormal;
Color end = ColorTable.TrackInnerBorder;
Color border = ColorTable.ThumbBorderNormal;
float mode =
base.Orientation == Orientation.Horizontal ?
90f : 0f;
switch (base.Orientation)
{
case Orientation.Horizontal:
switch (base.TickStyle)
{
case TickStyle.None:
case TickStyle.BottomRight:
direction = ThumbArrowDirection.Down;
break;
case TickStyle.TopLeft:
direction = ThumbArrowDirection.Up;
break;
case TickStyle.Both:
direction = ThumbArrowDirection.None;
break;
}
break;
case Orientation.Vertical:
switch (base.TickStyle)
{
case TickStyle.TopLeft:
direction = ThumbArrowDirection.Left;
break;
case TickStyle.None:
case TickStyle.BottomRight:
direction = ThumbArrowDirection.Right;
break;
case TickStyle.Both:
direction = ThumbArrowDirection.None;
break;
}
break;
}
switch (state)
{
case ControlState.Hover:
begin = ColorTable.ThumbBackHover;
border = ColorTable.ThumbBorderHover;
break;
}
using (SmoothingModeGraphics sg = new SmoothingModeGraphics(g))
{
using (GraphicsPath path =
GraphicsPathHelper.CreateTrackBarThumbPath(
rect, direction))
{
using (LinearGradientBrush brush = new LinearGradientBrush(
rect, begin, end, mode))
{
Blend blend = new Blend();
blend.Positions = new float[] { 0, .2f, .5f, .8f, 1f };
blend.Factors = new float[] { 1f, .7f, 0, .7f, 1f };
brush.Blend = blend;
g.FillPath(brush, path);
}
using (Pen pen = new Pen(border))
{
g.DrawPath(pen, path);
}
}
rect.Inflate(-1, -1);
using (GraphicsPath path =
GraphicsPathHelper.CreateTrackBarThumbPath(
rect, direction))
{
using (Pen pen = new Pen(ColorTable.TrackInnerBorder))
{
g.DrawPath(pen, path);
}
}
}
}
