/// <summary>
/// Draws the background image defined by the visual style for the specified control part
/// </summary>
/// <param name="g">The Graphics to draw on</param>
/// <param name="windowClass">The class of the part to draw</param>
/// <param name="part">The part to draw</param>
/// <param name="partState">The state of the part to draw</param>
/// <param name="drawRect">The Rectangle in which the part is drawn</param>
/// <param name="clipRect">The Rectangle that represents the clipping area for the part</param>
public static void DrawThemeBackground(Graphics g, string windowClass, int part, int partState, Rectangle drawRect, Rectangle clipRect)
{
if (g == null || drawRect.Width <= 0 || drawRect.Height <= 0 || clipRect.Width <= 0 || clipRect.Height <= 0)
{
return;
}
// open theme data
IntPtr hTheme = IntPtr.Zero;
hTheme = Win32API.OpenThemeData(hTheme, windowClass);
// make sure we have a valid handle
if (hTheme != IntPtr.Zero)
{
// get a graphics object the UxTheme can draw into
IntPtr hdc = g.GetHdc();
// get the draw and clipping rectangles
RECT dRect = RECT.FromRectangle(drawRect);
RECT cRect = RECT.FromRectangle(clipRect);
// draw the themed background
Win32API.DrawThemeBackground(hTheme, hdc, part, partState, ref dRect, ref cRect);
// clean up resources
g.ReleaseHdc(hdc);
}
// close the theme handle
Win32API.CloseThemeData(hTheme);
}