daniel-c-harvey
e78a61c3b1
CmsAllReleasesGrid self-loads the cross-medium release list so 8.A can host it as the ALL tab with no VM plumbing; TrackList's Albums mode renders it now. Preserves sort/delete/expand/edit and the 8.D Type chip.
75 lines
2.6 KiB
C#
75 lines
2.6 KiB
C#
using DeepDrftModels.DTOs;
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namespace DeepDrftManager.Services;
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/// <summary>The browse dimensions for the /tracks page.</summary>
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public enum BrowseMode
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{
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Tracks,
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Albums,
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Archive,
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Genres,
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}
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/// <summary>
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/// Holds the /tracks browser's current mode plus the album- and genre-mode datasets. Scoped per
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/// circuit. Album and genre lists are fetched lazily on first switch into their mode and cached for
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/// the circuit's lifetime; Track mode owns its own paging inside <c>CmsTrackGrid</c> and needs no
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/// state here.
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/// </summary>
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public class CmsTrackBrowserViewModel
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{
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private readonly ICmsTrackService _trackService;
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public CmsTrackBrowserViewModel(ICmsTrackService trackService)
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{
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_trackService = trackService;
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}
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public BrowseMode Mode { get; private set; } = BrowseMode.Tracks;
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// Genre mode.
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public IReadOnlyList<GenreSummaryDto> Genres { get; private set; } = Array.Empty<GenreSummaryDto>();
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public bool GenresLoading { get; private set; }
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public string? ExpandedGenre { get; private set; }
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/// <summary>
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/// Switch the active mode, lazily loading the genre dataset on first entry into Genre mode and
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/// collapsing any expanded genre row. Track mode and the all-releases grid (Albums mode) each own
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/// their own data — the grid loads itself (see <c>CmsAllReleasesGrid</c>) — so no fetch happens for
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/// either here.
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/// </summary>
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public async Task SwitchModeAsync(BrowseMode mode)
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{
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Mode = mode;
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ExpandedGenre = null; // collapse on mode switch
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if (mode == BrowseMode.Genres && Genres.Count == 0 && !GenresLoading)
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{
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GenresLoading = true;
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var result = await _trackService.GetGenreSummariesAsync();
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Genres = result.Success && result.Value is not null
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? result.Value
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: Array.Empty<GenreSummaryDto>();
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GenresLoading = false;
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}
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}
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/// <summary>Toggle the expanded genre row. Selecting the already-expanded genre collapses it.</summary>
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public void SetExpandedGenre(string? genre)
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{
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ExpandedGenre = ExpandedGenre == genre ? null : genre;
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}
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/// <summary>
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/// Drop the cached genre dataset so the next <see cref="SwitchModeAsync"/> into Genre mode
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/// re-fetches from the API. Call after a track or release mutation (edit, delete) since the genre
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/// summaries are derived from the catalogue and go stale on any such change. The all-releases grid
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/// owns and refreshes its own data, so it needs no invalidation here.
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/// </summary>
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public void Invalidate()
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{
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Genres = Array.Empty<GenreSummaryDto>();
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}
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}
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