protected ComicNavigationItemGridViewModel(
IMainPageContent parent,
MainViewModel appViewModel,
NavigationTag navigationTag,
ComicCollectionSortSelector initialSort
) : base(parent, appViewModel)
{
// Note: in the future, we may want to store this to remove the event handler
switch (navigationTag)
{
case NavigationTag.Comics:
throw new ProgrammerError("Cannot make of navigation item view model for work items");
case NavigationTag.Playlist:
this.collections = this.MainViewModel.Playlists;
this.collections.SetSort(initialSort);
break;
default:
this.collections = this.MainViewModel.SortedComicCollectionsFor(navigationTag, initialSort);
break;
}
this.collections.CollectionsChanged += this.Collections_CollectionsChanged;
}
public static IComparer <IComicCollection> Make(ComicCollectionSortSelector sortSelector)
{
return(sortSelector switch {
ComicCollectionSortSelector.Name => new NameComparer(),
ComicCollectionSortSelector.ItemCount => new ItemCountComparer(),
ComicCollectionSortSelector.Random => throw new ProgrammerError(
$"{nameof(ComicCollectionComparers)}.{nameof(Make)}: Random not allowed here"
),
_ => throw new ProgrammerError($"{nameof(ComicCollectionComparers)}.{nameof(Make)}: unexpected sort selector")
});
public static ComicNavigationItemGridViewModel ForViewModel(
IMainPageContent parent,
MainViewModel mainViewModel,
NavigationTag navigationTag,
ComicCollectionSortSelector initialSort,
ComicItemGridState?savedState = null
)
{
var viewModel = new ComicNavigationItemGridViewModel(parent, mainViewModel, navigationTag, initialSort);
if (savedState?.LastModified is { } lastModified&& lastModified == mainViewModel.LastModified)
{
viewModel.SetComicItems(savedState.Items);
}
