public void UnregisterThumbnail()
{
if (_thumbnailHandle != IntPtr.Zero)
{
DwmApi.DwmUnregisterThumbnail(_thumbnailHandle);
}
}
public void RegisterThumbnail(IntPtr baseWindow, ref System.Windows.Controls.Image image, Point location, Size size)
{
if (_thumbnailHandle != IntPtr.Zero)
{
DwmApi.DwmUnregisterThumbnail(_thumbnailHandle);
}
DwmApi.DwmRegisterThumbnail(baseWindow, _windowHandle, out _thumbnailHandle);
if (_thumbnailHandle == IntPtr.Zero)
{
return;
}
var thumbnailProperties = new DwmApi.ThumbnailProperties
{
dwFlags = DwmApi.ThumbnailProperties.DWM_TNP_VISIBLE +
DwmApi.ThumbnailProperties.DWM_TNP_OPACITY +
DwmApi.ThumbnailProperties.DWM_TNP_RECTDESTINATION,
opacity = 255,
fVisible = true,
rcDestination = new WUser32.Rectangle
{
Left = (int)location.X,
Top = (int)location.Y,
Right = (int)size.Width,
Bottom = (int)size.Height
}
};
DwmApi.DwmUpdateThumbnailProperties(_thumbnailHandle, ref thumbnailProperties);
}