[GUI] Improve file and folder loading (drag&drop)

- Added support for drag&drop of multiple folders
- Open/Export dialog can now also use a path taken from drag&drop items

Author: aelurum

AssetStudio/AssetsManager.cs

@@ -53,19 +53,53 @@ public void SetAssetFilter(List<ClassIDType> classIDTypeList)
                 SetAssetFilter(classIDType);
         }
 
-        public void LoadFiles(params string[] files)
+        public void LoadFilesAndFolders(params string[] path)
         {
-            var path = Path.GetDirectoryName(Path.GetFullPath(files[0]));
-            MergeSplitAssets(path);
-            var toReadFile = ProcessingSplitFiles(files.ToList());
-            Load(toReadFile);
+            List<string> pathList = new List<string>();
+            pathList.AddRange(path);
+            LoadFilesAndFolders(out _, pathList);
+        }
+
+        public void LoadFilesAndFolders(out string parentPath, params string[] path)
+        {
+            List<string> pathList = new List<string>();
+            pathList.AddRange(path);
+            LoadFilesAndFolders(out parentPath, pathList);
         }
 
-        public void LoadFolder(string path)
+        public void LoadFilesAndFolders(out string parentPath, List<string> pathList)
         {
-            MergeSplitAssets(path, true);
-            var files = Directory.GetFiles(path, "*.*", SearchOption.AllDirectories).ToList();
-            var toReadFile = ProcessingSplitFiles(files);
+            List<string> fileList = new List<string>();
+            bool filesInPath = false;
+            parentPath = "";
+            foreach (var path in pathList)
+            {
+                var fullPath = Path.GetFullPath(path);
+                if (Directory.Exists(fullPath))
+                {
+                    var parent = Directory.GetParent(fullPath).FullName;
+                    if (!filesInPath && (parentPath == "" || parentPath.Length > parent.Length))
+                    {
+                        parentPath = parent;
+                    }
+                    MergeSplitAssets(fullPath, true);
+                    fileList.AddRange(Directory.GetFiles(fullPath, "*.*", SearchOption.AllDirectories));
+                }
+                else
+                {
+                    parentPath = Path.GetDirectoryName(fullPath);
+                    fileList.Add(fullPath);
+                    filesInPath = true;
+                }
+            }
+            if (filesInPath)
+            {
+                MergeSplitAssets(parentPath);
+            }
+            var toReadFile = ProcessingSplitFiles(fileList);
+            fileList.Clear();
+            pathList.Clear();
+
             Load(toReadFile);
         }
 

AssetStudioCLI/Studio.cs

@@ -33,14 +33,7 @@ public bool LoadAssets()
             assetsManager.SpecifyUnityVersion = options.o_unityVersion.Value;
             assetsManager.SetAssetFilter(options.o_exportAssetTypes.Value);
 
-            if (Directory.Exists(options.inputPath))
-            {
-                assetsManager.LoadFolder(options.inputPath);
-            }
-            else
-            {
-                assetsManager.LoadFiles(options.inputPath);
-            }
+            assetsManager.LoadFilesAndFolders(options.inputPath);
             if (assetsManager.assetsFileList.Count == 0)
             {
                 Logger.Warning("No Unity file can be loaded.");

AssetStudioGUI/AssetStudioGUIForm.cs

@@ -143,14 +143,8 @@ private async void AssetStudioGUIForm_DragDrop(object sender, DragEventArgs e)
             {
                 ResetForm();
                 assetsManager.SpecifyUnityVersion = specifyUnityVersion.Text;
-                if (paths.Length == 1 && Directory.Exists(paths[0]))
-                {
-                    await Task.Run(() => assetsManager.LoadFolder(paths[0]));
-                }
-                else
-                {
-                    await Task.Run(() => assetsManager.LoadFiles(paths));
-                }
+                await Task.Run(() => assetsManager.LoadFilesAndFolders(out openDirectoryBackup, paths));
+                saveDirectoryBackup = openDirectoryBackup;
                 BuildAssetStructures();
             }
         }
@@ -161,9 +155,8 @@ private async void loadFile_Click(object sender, EventArgs e)
             if (openFileDialog1.ShowDialog(this) == DialogResult.OK)
             {
                 ResetForm();
-                openDirectoryBackup = Path.GetDirectoryName(openFileDialog1.FileNames[0]);
                 assetsManager.SpecifyUnityVersion = specifyUnityVersion.Text;
-                await Task.Run(() => assetsManager.LoadFiles(openFileDialog1.FileNames));
+                await Task.Run(() => assetsManager.LoadFilesAndFolders(out openDirectoryBackup, openFileDialog1.FileNames));
                 BuildAssetStructures();
             }
         }
@@ -175,9 +168,8 @@ private async void loadFolder_Click(object sender, EventArgs e)
             if (openFolderDialog.ShowDialog(this) == DialogResult.OK)
             {
                 ResetForm();
-                openDirectoryBackup = openFolderDialog.Folder;
                 assetsManager.SpecifyUnityVersion = specifyUnityVersion.Text;
-                await Task.Run(() => assetsManager.LoadFolder(openFolderDialog.Folder));
+                await Task.Run(() => assetsManager.LoadFilesAndFolders(out openDirectoryBackup, openFolderDialog.Folder));
                 BuildAssetStructures();
             }
         }