protected internal virtual void OnPaintScrollBarTrack(
PaintScrollBarTrackEventArgs e)
{
System.Drawing.Graphics g = e.Graphics;
Rectangle rect = e.TrackRectangle;
Color baseColor = GetGray(ColorTable.Base);
ControlPaintEx.DrawScrollBarTrack(
g, rect, baseColor, Color.White, e.Orientation);
}
void IScrollBarPaint.OnPaintScrollBarTrack(PaintScrollBarTrackEventArgs e)
{
OnPaintScrollBarTrack(e);
}
private void DrawScrollBar(
IntPtr maskHWnd,
Rectangle bounds,
Rectangle trackRect,
Rectangle topLeftArrowRect,
Rectangle bottomRightArrowRect,
Rectangle thumbRect,
ControlState topLeftArrowState,
ControlState bottomRightArrowState,
ControlState thumbState,
Orientation direction)
{
bool bHorizontal = direction == Orientation.Horizontal;
ArrowDirection arrowDirection;
bool bEnabled = _owner.Enabled;
IScrollBarPaint paint = _owner as IScrollBarPaint;
if (paint == null)
{
return;
}
ImageDc tempDc = new ImageDc(bounds.Width, bounds.Height);
IntPtr hdc = NativeMethods.GetDC(maskHWnd);
try
{
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromHdc(tempDc.Hdc))
{
using (PaintScrollBarTrackEventArgs te =
new PaintScrollBarTrackEventArgs(
g,
trackRect,
direction,
bEnabled))
{
paint.OnPaintScrollBarTrack(te);
}
arrowDirection = bHorizontal ?
ArrowDirection.Left : ArrowDirection.Up;
using (PaintScrollBarArrowEventArgs te =
new PaintScrollBarArrowEventArgs(
g,
topLeftArrowRect,
topLeftArrowState,
arrowDirection,
direction,
bEnabled))
{
paint.OnPaintScrollBarArrow(te);
}
arrowDirection = bHorizontal ?
ArrowDirection.Right : ArrowDirection.Down;
using (PaintScrollBarArrowEventArgs te =
new PaintScrollBarArrowEventArgs(
g,
bottomRightArrowRect,
bottomRightArrowState,
arrowDirection,
direction,
bEnabled))
{
paint.OnPaintScrollBarArrow(te);
}
using (PaintScrollBarThumbEventArgs te =
new PaintScrollBarThumbEventArgs(
g,
thumbRect,
thumbState,
direction,
bEnabled))
{
paint.OnPaintScrollBarThumb(te);
}
}
NativeMethods.BitBlt(
hdc,
0,
0,
bounds.Width,
bounds.Height,
tempDc.Hdc,
0,
0,
TernaryRasterOperations.SRCCOPY);
}
finally
{
NativeMethods.ReleaseDC(maskHWnd, hdc);
tempDc.Dispose();
}
}
