static extern bool GetClientRect(IntPtr hWnd, ref RECT lpRect);
/// <summary>
/// Shows screen saver preview by creating one instance of ScreenSaverWindow.
///
/// Note: uses WinForms's Screen class to get monitor info.
/// </summary>
internal void ShowPreview(String arg)
{
System.Windows.Point scale = Interop.GetVisualScale();
Debug.WriteLine(scale);
fx = new GrayscaleEffect
{
Chrominance = App.Config.Chrominance,
Negative = App.Config.Negative,
LeaveBlack = App.Config.LeaveBlack
};
//set volume and stretch method
this.VideoElement = new MediaElement();
VideoElement.UnloadedBehavior = MediaState.Manual;
VideoElement.Source = App.Config.Video;
VideoElement.IsMuted = false;
VideoElement.Volume = App.Config.Volume;
VideoElement.Stretch = App.Config.Stretch;
VideoElement.MediaEnded += new RoutedEventHandler(VideoElement_MediaEnded);
VideoElement.MediaOpened += new RoutedEventHandler(VideoElement_MediaOpened);
Int32 previewHandle = Convert.ToInt32(arg);
IntPtr pPreviewHnd = new IntPtr(previewHandle);
RECT lpRect = new RECT();
bool bGetRect = GetClientRect(pPreviewHnd, ref lpRect);
this.winSaver = new ScreenSaverWindow(new VisualBrush(VideoElement));
HwndSourceParameters sourceParams = new HwndSourceParameters("sourceParams");
//set window properties
sourceParams.Height = lpRect.Bottom - lpRect.Top;
sourceParams.Width = lpRect.Right - lpRect.Left;
sourceParams.ParentWindow = pPreviewHnd;
sourceParams.WindowStyle = (int)(0x10000000 | 0x40000000 | 0x02000000);
//set up preview
winWPFContent = new HwndSource(sourceParams);
winWPFContent.Disposed += new EventHandler(winWPFContent_Disposed);
winWPFContent.RootVisual = winSaver.grid1;
winSaver.Width = (lpRect.Right - lpRect.Left) / scale.X;
winSaver.Height = (lpRect.Bottom - lpRect.Top) / scale.Y;
winSaver.VideoBlock.Width = (lpRect.Right - lpRect.Left) / scale.X;
winSaver.VideoBlock.Height = (lpRect.Right - lpRect.Left) / scale.X;
//set a background
//Note: Uses an arbitrary screen size to determine when to do this
if (winSaver.Width <= 320 && winSaver.Height <= 240)
{
winSaver.DesktopBackground.Source = new BitmapImage(new Uri(Interop.GetDesktopWallpaper(), UriKind.Absolute));
winSaver.DesktopBackground.Stretch = Interop.GetWallpaperStretch();
}
winSaver.isPreview = true;
winSaver.Show();
VideoElement.Play();
}