Implement file system resource manager.

Assets/Cryville/Crtr/Browsing/FileSystemResourceManager.cs

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+using Cryville.Common;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace Cryville.Crtr.Browsing {
+	internal class FileSystemResourceManager : IPathedResourceManager<FileSystemEntry> {
+		DirectoryInfo _cd;
+		FileSystemEntry[] _items = new FileSystemEntry[0];
+		FileSystemEntry[] _filteredItems = new FileSystemEntry[0];
+		string _filter = string.Empty;
+
+		public FileSystemEntry this[int index] { get { return _filteredItems[index]; } }
+		IResourceMeta IResourceManager.this[int index] { get { return this[index]; } }
+
+		readonly List<string> _dirParts = new List<string>();
+		readonly IList<string> m_dirParts;
+		public IList<string> CurrentDirectory { get { return m_dirParts; } }
+		public int Count { get { return _filteredItems.Length; } }
+		public bool IsReadOnly { get { return true; } }
+
+		public event Action DirectoryChanged;
+		public event Action ItemChanged;
+
+		readonly ISet<string> _extFilter = ExtensionManager.GetSupportedFormats();
+
+		public FileSystemResourceManager() {
+			m_dirParts = _dirParts.AsReadOnly();
+			OnDirectoryChange();
+		}
+
+		void OnDirectoryChange() {
+			if (_dirParts.Count == 0) {
+				IEnumerable<FileSystemEntry> items;
+#if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
+				items = DriveInfo.GetDrives().Select(d => new FileSystemEntry(d.RootDirectory));
+#elif UNITY_ANDROID
+				items = new FileSystemEntry[] { new FileSystemEntry("Storage", new DirectoryInfo("/sdcard")) };
+#else
+#error No root path searching logic
+#endif
+				items = items.Concat(
+					ExtensionManager.GetLocalResourcePaths()
+					.Select(p => new FileSystemEntry(p.Key, new DirectoryInfo(p.Value)))
+				);
+				_items = items.ToArray();
+				ItemChanged?.Invoke();
+			}
+			else {
+				var path = string.Join(Path.DirectorySeparatorChar, _dirParts);
+#if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
+				if (_dirParts.Count == 1) path += Path.DirectorySeparatorChar;
+#elif UNITY_ANDROID
+				path += Path.DirectorySeparatorChar;
+#else
+#error No root path handling logic
+#endif
+				_cd = new DirectoryInfo(path);
+				_items = _cd.GetFileSystemInfos()
+					.Where(i => i is DirectoryInfo || _extFilter.Contains(i.Extension))
+					.Select(i => new FileSystemEntry(i)).ToArray();
+			}
+			ApplyFilter();
+			DirectoryChanged?.Invoke();
+		}
+
+		public void Activate() { }
+		public void Deactivate() { }
+
+		public Uri GetItemUri(int index) {
+			return new Uri(PlatformConfig.FileProtocolPrefix + _filteredItems[index].FileSystemInfo.FullName);
+		}
+
+		public void ChangeDirectory(IEnumerable<string> dir) {
+			_dirParts.Clear();
+			foreach (string dirPart in dir) _dirParts.Add(dirPart);
+			OnDirectoryChange();
+		}
+		public bool IsDirectory(int index) {
+			return _filteredItems[index].FileSystemInfo is DirectoryInfo;
+		}
+		public void OpenDirectory(int index) {
+			_dirParts.Clear();
+			foreach (string dirPart in _filteredItems[index].FileSystemInfo.FullName.Split(Path.DirectorySeparatorChar, StringSplitOptions.RemoveEmptyEntries)) _dirParts.Add(dirPart);
+			OnDirectoryChange();
+		}
+		public void ReturnToDirectory(int index) {
+			_dirParts.RemoveRange(index + 1, _dirParts.Count - index - 1);
+			OnDirectoryChange();
+		}
+		public void ApplyFilter(string filter) {
+			_filter = filter;
+			ApplyFilter();
+		}
+		void ApplyFilter() {
+			IEnumerable<FileSystemEntry> items = _items;
+			foreach (var keyword in _filter.Split(' ', StringSplitOptions.RemoveEmptyEntries)) {
+				items = items.Where(i => i.FileSystemInfo.Name.Contains(keyword, StringComparison.CurrentCultureIgnoreCase));
+			}
+			_filteredItems = items.ToArray();
+			ItemChanged?.Invoke();
+		}
+
+		public bool ImportFrom(Uri uri) { throw new NotSupportedException(); }
+		public void RemoveAt(int index) { throw new NotSupportedException(); }
+	}
+
+	internal class FileSystemEntry : IResourceMeta {
+		readonly string _name;
+		public FileSystemInfo FileSystemInfo { get; private set; }
+
+		public FileSystemEntry(FileSystemInfo fileSystemInfo) : this(fileSystemInfo.Name, fileSystemInfo) { }
+		public FileSystemEntry(string name, FileSystemInfo fileSystemInfo) {
+			_name = name;
+			FileSystemInfo = fileSystemInfo;
+		}
+
+		public IEnumerable<MetaProperty> Properties {
+			get {
+				yield return new MetaProperty("Name", _name);
+				if (FileSystemInfo is FileInfo) {
+					var file = (FileInfo)FileSystemInfo;
+					yield return new MetaProperty("Size", new Qualified<long>(file.Length, "B"));
+				}
+				yield return new MetaProperty("Write.Time", FileSystemInfo.LastWriteTime);
+				yield return new MetaProperty("Creation.Time", FileSystemInfo.CreationTime);
+				yield return new MetaProperty("Access.Time", FileSystemInfo.LastAccessTime);
+			}
+		}
+	}
+}

Assets/Cryville/Crtr/Browsing/FileSystemResourceManager.cs.meta

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