Handler to provide an asynchronous thumbnail for an item. Is called when the item is about to be displayed. Compared to preview a thumbnail should be small and returned as fast as possible. Use fetchPreview if you want to generate a preview that is bigger and slower to return. Allows a plugin provider to only fetch/generate previews when they are needed.
[SearchItemProvider] internal static SearchProvider CreateProvider() { return new SearchProvider("example_tree", "Trees") { filterId = "tree:", priority = 99999, // Put example provider at a low priority showDetailsOptions = ShowDetailsOptions.Inspector | ShowDetailsOptions.Actions, fetchItems = (context, items, provider) => FetchItems(context, provider), fetchThumbnail = (item, context) => AssetDatabase.GetCachedIcon(item.id) as Texture2D, fetchPreview = (item, context, size, options) => AssetDatabase.GetCachedIcon(item.id) as Texture2D, fetchLabel = (item, context) => AssetDatabase.LoadMainAssetAtPath(item.id).name, fetchDescription = (item, context) => AssetDatabase.LoadMainAssetAtPath(item.id).name, toObject = (item, type) => AssetDatabase.LoadMainAssetAtPath(item.id), }; } private static IEnumerable<SearchItem> FetchItems(SearchContext context, SearchProvider provider) { if (context.empty) yield break; // Yield items asynchronously which is the recommended way. foreach (var guid in AssetDatabase.FindAssets("t:Prefab tree " + context.searchQuery)) yield return provider.CreateItem(context, AssetDatabase.GUIDToAssetPath(guid), null, null, null, null); }