private void JumpPre()
{
var pre = HistoryImageProvider.Previous(image.Date);
if (pre != null)
{
image = pre;
}
else
{
image = HistoryImageProvider.Last();
}
LoadImageAsync();
}
public async void PreWallpaper()
{
if (CurrentWallpaper != null)
{
var newImage = HistoryImageProvider.Previous(this.CurrentWallpaper.Date);
if (newImage != null)
{
this.CurrentWallpaper = newImage;
await UpdateWallpaper();
}
else
{
this.CurrentWallpaper = HistoryImageProvider.Last();
await UpdateWallpaper();
}
}
else
{
RandomWallpaper();
}
}
