void DrawCheckOnly(PaintEventArgs e, LayoutData layout, ColorData colors, Color checkColor, Color checkBackground, bool disabledColors)
{
// check
//
if (Checked)
{
if (!Enabled && disabledColors)
{
checkColor = colors.buttonShadow;
}
else if (CheckState == CheckState.Indeterminate && disabledColors)
{
checkColor = SystemInformation.HighContrast ? colors.highlight :
colors.buttonShadow;
}
Rectangle fullSize = layout.checkBounds;
if (fullSize.Width == flatCheckSize)
{
fullSize.Width++;
fullSize.Height++;
}
fullSize.Width++;
fullSize.Height++;
if (checkImage == null || checkImage.Width != fullSize.Width || checkImage.Height != fullSize.Height)
{
if (checkImage != null)
{
checkImage.Dispose();
checkImage = null;
}
// We draw the checkmark slightly off center to eliminate 3-D border artifacts,
// and compensate below
NativeMethods.RECT rcCheck = NativeMethods.RECT.FromXYWH(0, 0, fullSize.Width, fullSize.Height);
Bitmap bitmap = new Bitmap(fullSize.Width, fullSize.Height);
Graphics offscreen = Graphics.FromImage(bitmap);
offscreen.Clear(Color.Transparent);
IntPtr dc = offscreen.GetHdc();
try {
SafeNativeMethods.DrawFrameControl(new HandleRef(offscreen, dc), ref rcCheck,
NativeMethods.DFC_MENU, NativeMethods.DFCS_MENUCHECK);
}
finally {
offscreen.ReleaseHdcInternal(dc);
}
offscreen.Dispose();
bitmap.MakeTransparent();
checkImage = bitmap;
}
fullSize.Y -= 1;
Region original = e.Graphics.Clip;
ControlPaint.DrawImageColorized(e.Graphics, checkImage, fullSize, checkColor);
}
}