/// <summary>
/// Retrieves the next element from source.
/// </summary>
/// <param name="current">Current element</param>
/// <returns>The next element from items, if it exists. Otherwise, returns null</returns>
public async Task <EntitiesBase.YouTubeVideo> Next(EntitiesBase.YouTubeVideo current)
{
var data = _storageService.Load <ObservableCollection <EntitiesBase.YouTubeVideo> >("Videos_s5");
if (current == null || !data.Any())
{
return(null);
}
var index = data.IndexOf(current);
if (index == -1)
{
return(null);
}
if (index != data.Count - 1)
{
return(data[index + 1]);
}
var nextPageData = await GetData((int)Math.Ceiling(data.Count / (double)MaxResults));
if (!nextPageData.Any())
{
return(null);
}
return(nextPageData.First());
}
/// <summary>
/// Checks if data source has a element before the passed as parameter
/// </summary>
/// <param name="current">Current element</param>
/// <returns>True, if there is a previous element, false if there is not</returns>
public bool HasPrevious(EntitiesBase.YouTubeVideo current)
{
var data = _storageService.Load <ObservableCollection <EntitiesBase.YouTubeVideo> >("Videos_s5");
if (current == null || !data.Any())
{
return(false);
}
return(data.IndexOf(current) > 0);
}
/// <summary>
/// Checks if data source has a element after the passed as parameter
/// </summary>
/// <param name="current">Current element</param>
/// <returns>True, if there is a next element, false if there is not</returns>
public async Task <bool> HasNext(EntitiesBase.YouTubeVideo current)
{
var data = await GetData();
if (current == null || !data.Any())
{
return(false);
}
return(data.IndexOf(current) < data.Count - 1);
}
/// <summary>
/// Checks if data source has a element before the passed as parameter
/// </summary>
/// <param name="current">Current element</param>
/// <returns>True, if there is a previous element, false if there is not</returns>
public bool HasPrevious(EntitiesBase.YouTubeVideo current)
{
var data = new List <EntitiesBase.YouTubeVideo>();
if (current == null || !data.Any())
{
return(false);
}
return(data.IndexOf(current) > 0);
}
/// <summary>
/// Retrieves the next element from source.
/// </summary>
/// <param name="current">Current element</param>
/// <returns>The next element from items, if it exists. Otherwise, returns null</returns>
public async Task <EntitiesBase.YouTubeVideo> Next(EntitiesBase.YouTubeVideo current)
{
var data = await GetData();
if (current == null)
{
return(data.FirstOrDefault());
}
if (data.Any() && data.Last().Equals(current))
{
return(null);
}
return(data[data.IndexOf(current) + 1]);
}
/// <summary>
/// Retrieves the previous element from source.
/// </summary>
/// <param name="current">Current element</param>
/// <returns>The previous element from items, if it exists. Otherwise, returns null</returns>
public EntitiesBase.YouTubeVideo Previous(EntitiesBase.YouTubeVideo current)
{
var data = new List <EntitiesBase.YouTubeVideo>();
if (current == null)
{
return(data.FirstOrDefault());
}
if (data.Any() && data.First().Equals(current))
{
return(null);
}
return(data[data.IndexOf(current) - 1]);
}
/// <summary>
/// Retrieves the previous element from source.
/// </summary>
/// <param name="current">Current element</param>
/// <returns>The previous element from items, if it exists. Otherwise, returns null</returns>
public EntitiesBase.YouTubeVideo Previous(EntitiesBase.YouTubeVideo current)
{
var data = _storageService.Load <ObservableCollection <EntitiesBase.YouTubeVideo> >("Videos_s5");
if (current == null || !data.Any())
{
return(null);
}
var index = data.IndexOf(current);
if (index == -1 || index == 0)
{
return(null);
}
return(data[index - 1]);
}
/// <summary>
/// Checks if data source has a element after the passed as parameter
/// </summary>
/// <param name="current">Current element</param>
/// <returns>True, if there is a next element, false if there is not</returns>
public async Task <bool> HasNext(EntitiesBase.YouTubeVideo current)
{
var data = _storageService.Load <ObservableCollection <EntitiesBase.YouTubeVideo> >("Videos_s5");
if (current == null || !data.Any())
{
return(false);
}
if (data.IndexOf(current) < data.Count - 1)
{
return(true);
}
var nextPageData = await GetData((int)Math.Ceiling(data.Count / (double)MaxResults));
return(nextPageData.Any());
}
