/// <summary>
/// Get the selected simple and Genre tags and determine if there has been any changes
/// </summary>
private void OnOk(MultiSpinner genreSpinner, Spinner tagSpinner)
{
// Get the selected record from the Genre spinner. If not all of the items are selected then add an entry for each selected item to a new TagGroup
List <TagGroup> selectedGroups = new List <TagGroup>();
if (genreSpinner.SelectionRecord.All(genre => genre) == false)
{
TagGroup group = new TagGroup()
{
Name = FilterManagementModel.GenreTags.Name
};
selectedGroups.Add(group);
// Merge the Spinner's selection record and the Genre tags into a single list and then add to the new group any tags that are selected
IEnumerable <Tuple <bool, Tag> > merged = genreSpinner.SelectionRecord.Zip(FilterManagementModel.GenreTags.Tags, (x, y) => Tuple.Create(x, y));
group.Tags.AddRange(merged.Where(t => (t.Item1 == true)).Select(t => t.Item2));
}
// Get the simple tag
Tag newTag = (tagSpinner.SelectedItemPosition == 0) ? null : Tags.GetTagByName(tagSpinner.SelectedItem.ToString());
// Check for simple or group tag changes
if ((newTag != CurrentlySelectedFilter) || (selectedGroups.Count != CurrentlySelectedTagGroups.Count) ||
(selectedGroups.Any(group => GroupChanged(group)) == true))
{
// Update the FilterManagementModel TagGroups with the possibly updated data from the Adapter
CurrentlySelectedTagGroups.Clear();
CurrentlySelectedTagGroups.AddRange(selectedGroups);
SelectionDelegate?.Invoke(newTag);
}
}
/// <summary>
/// Form a new Albums collection where albums with multiple genres are given multiple entries. The Albums will be in genre order
/// </summary>
private static void GenerateGenreAlbumList()
{
// This is the album list that we'll be generating
AlbumsViewModel.GenreSortedAlbums = new List <Album>();
// This genre list is generated alongside the main Album list
AlbumsViewModel.AlbumIndexToGenreLookup = new List <string>();
// We need a lookup table for all the Albums in the current filtered Album list
Dictionary <int, Album> albumIds = AlbumsViewModel.FilteredAlbums.ToDictionary(alb => alb.Id);
// The Albums need to be sorted in genre order. If there is no genre filter then use all the genre tags, otherwise just use
// the tags in the filter
TagGroup genreTags = AlbumsViewModel.FilterSelector.TagGroups.SingleOrDefault(ta => ta.Name == "Genre") ?? FilterManagementModel.GenreTags;
// Get the Genre GroupTag and order the Tags by name. Copy the list so that we don't change it
List <Tag> sortedTags = genreTags.Tags.ToList();
sortedTags.Sort((a, b) => a.Name.CompareTo(b.Name));
// Use the Genre GroupTag to order the Album entries
foreach (Tag genreTag in sortedTags)
{
// For each TaggedAlbum in this tag that refers to an Album in the Album list add a new entry to the new Genre album list
foreach (TaggedAlbum taggedAlbum in genreTag.TaggedAlbums)
{
Album genreAlbum = albumIds.GetValueOrDefault(taggedAlbum.AlbumId);
if (genreAlbum != null)
{
AlbumsViewModel.AlbumIndexToGenreLookup.Add(genreTag.Name);
AlbumsViewModel.GenreSortedAlbums.Add(genreAlbum);
}
}
}
}
/// <summary>
/// Determine whether or not the group represents a changed selection
/// </summary>
/// <param name="group"></param>
/// <returns></returns>
private bool GroupChanged(TagGroup selectedGroup)
{
bool selectionChanged = false;
// Get the matching group in the current selection
TagGroup existingGroup = CurrentlySelectedTagGroups.SingleOrDefault(tg => tg.Name == selectedGroup.Name);
// If there is no existing group, or the group size has changed, or there are entries in the new group that are not in the old one
if ((existingGroup == null) || (selectedGroup.Tags.Count != existingGroup.Tags.Count) ||
(existingGroup.Tags.Except(selectedGroup.Tags).ToList().Count > 0))
{
selectionChanged = true;
}
return(selectionChanged);
}
/// <summary>
/// Initialise the contents of the Genre spinner
/// </summary>
/// <param name="genreSpinner"></param>
private void InitialiseGenreSpinner(MultiSpinner genreSpinner)
{
// Get the currently selected Genre items from the CurrentlySelectedTagGroups.
// If there is no Genre TagGroup then all the Genre items are selected.
// Otherwise only the items in the TagGroup are selected
bool[] selected = Enumerable.Repeat(true, FilterManagementModel.GenreTags.Tags.Count).ToArray();
// Is there a Genre TagGroup
TagGroup genreGroup = CurrentlySelectedTagGroups.FirstOrDefault(group => (group.Name == FilterManagementModel.GenreTags.Name));
if (genreGroup != null)
{
// Set the selected flag for each tag according to whether or not it is in the TagGroup
for (int genreIndex = 0; genreIndex < FilterManagementModel.GenreTags.Tags.Count; ++genreIndex)
{
selected[genreIndex] = genreGroup.Tags.Exists(tag => tag.Name == FilterManagementModel.GenreTags.Tags[genreIndex].Name);
}
}
// Display the names of all the genre tags in a multi-select spinner
genreSpinner.SetItems(FilterManagementModel.GenreTags.Tags.Select(ta => ta.Name).ToList(), selected, "All");
}