/// <summary>
/// Begins a new slideshow, cancelling any active ones and setting the initial
/// background.
/// </summary>
/// <param name="path">The path to the background directory.</param>
/// <param name="position">The position with which the background will be displayed.</param>
/// <param name="interval">The interval before which the next background will be set.</param>
/// <param name="index">The file index within the directory at which to begin.</param>
public static void BeginSlideshow(string path, PicturePosition position,
int interval, int index)
{
if (interval < 0)
{
throw new ArgumentOutOfRangeException("showInterval");
}
if (index < 0)
{
throw new ArgumentOutOfRangeException("showIndex");
}
// Get the absolute path to the directory
path = Path.GetFullPath(path);
// Get the current images in the given directory
string[] images = GetBackgroundsInFolder(path);
// Wrap index
if (index >= images.Length)
{
index = 0;
}
// Clamp interval
interval = Math.Min(interval, 44640);
// Save registry values
using (var key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true))
{
key.SetValue("WWU CurrentIndex", index);
key.SetValue("WWU CurrentInterval", interval);
key.SetValue("WWU CurrentDir", path);
}
// Remove any current slideshows
CancelSlideshow();
// Schedule slideshow
using (TaskService service = new TaskService())
{
// Create new task
TaskDefinition task = service.NewTask();
// Create time trigger
var trigger = new TimeTrigger();
trigger.SetRepetition(TimeSpan.FromMinutes(interval), TimeSpan.Zero);
task.Triggers.Add(trigger);
task.Settings.StartWhenAvailable = true;
task.Settings.WakeToRun = false;
// Add re-execution to set next background
task.Actions.Add(new ExecAction(GetWallpaperwExe() + " /next"));
// Register task
service.RootFolder.RegisterTaskDefinition("wwu_slideshow", task);
}
// Now actually set the first wallpaper
// Set blank if no images in folder
if (images.Length == 0)
{
WallpaperInterop.SetWallpaper("", PicturePosition.Center, false);
}
// Otherwise set background to the next image
else
{
WallpaperInterop.SetWallpaper(images[index], position, false);
}
}
