// Private methods
/// <summary>
/// Attempts to read manifest.json file in directory at DirPath and create a new
/// DynamicWallpaper object from its data. Calls Stop() if there's an error; otherwise
/// sets WallpaperName and "starts running" by calling SyncToSunProgress()
/// </summary>
private void DirPath_Change()
{
_timer.Enabled = false; // stop timer
// Try to read manifest file
string json = "";
try
{
json = File.ReadAllText(_dirPath + Path.DirectorySeparatorChar + "manifest.json");
}
catch (Exception e)
{
Console.Error.Write($"WallpaperScheduler.DirPath_Change - {e.ToString()}");
Stop();
return;
}
// Try to instantiate DynamicWallpaper object from json
try
{
_wallpaper = new DynamicWallpaper(json);
}
catch (Exception e)
{
Console.Error.Write($"WallpaperScheduler.DirPath_Change - {e.ToString()}");
Stop();
return;
}
WallpaperName = _wallpaper.Name;
// Set wallpaper based on sun's current progress
SyncToSunProgress();
}
/// <summary>
/// Disables timer, sets all properties and instance variables to indicate this WallpaperScheduler is not
/// controlling the wallpaper
/// </summary>
private void Stop()
{
_timer.Enabled = false;
DirPath = null;
Index = -1;
IsRunning = false;
NextChangeTime = DateTime.MinValue; // maybe NextChangeTime should be nullable ?
WallpaperName = "";
_wallpaper = null;
}