/// <summary>
/// Center the mouse pointer on a specified control (i.e. Button)
/// </summary>
/// <param name="control">Control on which to center mouse pointer</param>
public static void CenterMousePointer(Control control)
{
Win32.Point p = new Win32.Point();
p.x = control.Left + (control.Width / 2);
p.y = control.Top + (control.Height / 2);
Win32.ClientToScreen(control.FindForm().Handle, ref p);
Win32.SetCursorPos(p.x, p.y);
}
public static void SetBits(Form form, Bitmap bitmap)
{
//if (!haveHandle) return;
if (!Bitmap.IsCanonicalPixelFormat(bitmap.PixelFormat) ||
!Bitmap.IsAlphaPixelFormat(bitmap.PixelFormat))
{
throw new ApplicationException("The picture must be " +
"32bit picture with alpha channel");
}
IntPtr oldBits = IntPtr.Zero;
IntPtr screenDC = Win32.GetDC(IntPtr.Zero);
IntPtr hBitmap = IntPtr.Zero;
IntPtr memDc = Win32.CreateCompatibleDC(screenDC);
try
{
Win32.Point topLoc = new Win32.Point(form.Left, form.Top);
Win32.Size bitMapSize = new Win32.Size(bitmap.Width, bitmap.Height);
Win32.BLENDFUNCTION blendFunc = new Win32.BLENDFUNCTION();
Win32.Point srcLoc = new Win32.Point(0, 0);
hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
oldBits = Win32.SelectObject(memDc, hBitmap);
blendFunc.BlendOp = Win32.AC_SRC_OVER;
blendFunc.SourceConstantAlpha = 255;
blendFunc.AlphaFormat = Win32.AC_SRC_ALPHA;
blendFunc.BlendFlags = 0;
Win32.UpdateLayeredWindow(form.Handle, screenDC, ref topLoc, ref bitMapSize,
memDc, ref srcLoc, 0, ref blendFunc, Win32.ULW_ALPHA);
}
finally
{
if (hBitmap != IntPtr.Zero)
{
Win32.SelectObject(memDc, oldBits);
Win32.DeleteObject(hBitmap);
}
Win32.ReleaseDC(IntPtr.Zero, screenDC);
Win32.DeleteDC(memDc);
}
}