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fix: improve album list scrolling performance

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This commit is contained in:
Lei Nelissen
2023-02-28 10:08:24 +01:00
parent a34b6c5114
commit 099bbebe38
2 changed files with 70 additions and 74 deletions
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19
src/store/music/selectors.ts
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@@ -50,7 +50,7 @@ export const selectAlbumsByArtist = createSelector(
albumsByArtist,
);
export type SectionedId = SectionListData<EntityId>;
export type SectionedId = SectionListData<EntityId[]>;
/**
* Splits a set of albums into a list that is split by alphabet letters
@@ -58,13 +58,26 @@ export type SectionedId = SectionListData<EntityId>;
function splitAlbumsByAlphabet(state: AppState['music']['albums']): SectionedId[] {
const { entities: albums } = state;
const albumIds = albumsByArtist(state);
const sections: SectionedId[] = ALPHABET_LETTERS.split('').map((l) => ({ label: l, data: [] }));
const sections: SectionedId[] = ALPHABET_LETTERS.split('').map((l) => ({ label: l, data: [[]] }));
albumIds.forEach((id) => {
// Retrieve the album letter and corresponding letter index
const album = albums[id];
const letter = album?.AlbumArtist?.toUpperCase().charAt(0);
const index = letter ? ALPHABET_LETTERS.indexOf(letter) : 26;
(sections[index >= 0 ? index : 26].data as Array<EntityId>).push(id);
// Then find the current row in this section (note that albums are
// grouped in pairs so we can render them more easily).
const section = sections[index >= 0 ? index : 26];
const row = section.data.length - 1;
// Add the album to the row
section.data[row].push(id);
// GUARD: Check if the row is overflowing. If so, add a new row.
if (section.data[row].length >= 2) {
(section.data as EntityId[][]).push([]);
}
});
return sections;