fix: upload drag directory can not work

src/AjaxUploader.tsx

@@ -66,7 +66,7 @@ class AjaxUploader extends Component<UploadProps> {
     }
   };
 
-  onFileDrop = (e: React.DragEvent<HTMLDivElement>) => {
+  onFileDrop = async (e: React.DragEvent<HTMLDivElement>) => {
     const { multiple } = this.props;
 
     e.preventDefault();
@@ -76,11 +76,11 @@ class AjaxUploader extends Component<UploadProps> {
     }
 
     if (this.props.directory) {
-      traverseFileTree(
+      const files = await traverseFileTree(
         Array.prototype.slice.call(e.dataTransfer.items),
-        this.uploadFiles,
         (_file: RcFile) => attrAccept(_file, this.props.accept),
       );
+      this.uploadFiles(files);
     } else {
       let files = [...e.dataTransfer.files].filter((file: RcFile) =>
         attrAccept(file, this.props.accept),

src/traverseFileTree.ts

@@ -10,36 +10,34 @@ interface InternalDataTransferItem extends DataTransferItem {
   path: string;
 }
 
-const traverseFileTree = (files: InternalDataTransferItem[], callback, isAccepted) => {
+// https://github.com/ant-design/ant-design/issues/50080
+const traverseFileTree = async (files: InternalDataTransferItem[], isAccepted) => {
   const flattenFileList = [];
   const progressFileList = [];
   files.forEach(file => progressFileList.push(file.webkitGetAsEntry() as any));
-  function loopFiles(item: InternalDataTransferItem) {
-    const dirReader = item.createReader();
 
-    function sequence() {
-      dirReader.readEntries((entries: InternalDataTransferItem[]) => {
-        const entryList = Array.prototype.slice.apply(entries);
+  async function readDirectory(directory: InternalDataTransferItem) {
+    const dirReader = directory.createReader();
+    const entries = [];
 
-        progressFileList.push(...entryList);
-        // Check if all the file has been viewed
-        const isFinished = !entryList.length;
-        if (!isFinished) {
-          sequence();
-        }
+    while (true) {
+      const results = await new Promise<InternalDataTransferItem[]>((resolve, reject) => {
+        dirReader.readEntries(resolve, reject);
       });
-    }
 
-    sequence();
-  }
-  // eslint-disable-next-line @typescript-eslint/naming-convention
-  const _traverseFileTree = (item: InternalDataTransferItem, path?: string) => {
-    if (!item) {
-      return;
+      if (!results.length) {
+        break;
+      }
+
+      for (const entry of results) {
+        entries.push(entry);
+      }
     }
-    // eslint-disable-next-line no-param-reassign
-    item.path = path || '';
-    if (item.isFile) {
+    return entries;
+  }
+
+  async function readFile(item: InternalDataTransferItem) {
+    return new Promise<RcFile & { webkitRelativePath?: string }>(reslove => {
       item.file(file => {
         if (isAccepted(file)) {
           // https://github.com/ant-design/ant-design/issues/16426
@@ -57,23 +55,39 @@ const traverseFileTree = (files: InternalDataTransferItem[], callback, isAccepte
               },
             });
           }
-          flattenFileList.push(file);
+          reslove(file);
+        } else {
+          reslove(null);
         }
       });
+    });
+  }
+
+  // eslint-disable-next-line @typescript-eslint/naming-convention
+  const _traverseFileTree = async (item: InternalDataTransferItem, path?: string) => {
+    if (!item) {
+      return;
+    }
+    // eslint-disable-next-line no-param-reassign
+    item.path = path || '';
+    if (item.isFile) {
+      const file = await readFile(item);
+      if (file) {
+        flattenFileList.push(file);
+      }
     } else if (item.isDirectory) {
-      loopFiles(item);
+      const entries = await readDirectory(item);
+      progressFileList.push(...entries);
     }
   };
 
-  function walkFiles() {
-    let wipIndex = 0;
-    while (wipIndex < progressFileList.length) {
-      _traverseFileTree(progressFileList[wipIndex]);
-      wipIndex++;
-    }
-    callback(flattenFileList);
+  let wipIndex = 0;
+  while (wipIndex < progressFileList.length) {
+    await _traverseFileTree(progressFileList[wipIndex]);
+    wipIndex++;
   }
-  walkFiles();
+
+  return flattenFileList;
 };
 
 export default traverseFileTree;

tests/uploader.spec.tsx

@@ -37,12 +37,45 @@ const makeFileSystemEntry = item => {
   return ret;
 };
 
+const makeFileSystemEntryAsync = item => {
+  const isDirectory = Array.isArray(item.children);
+  const ret = {
+    isDirectory,
+    isFile: !isDirectory,
+    file: handle => {
+      handle(new Item(item.name));
+    },
+    createReader: () => {
+      let first = true;
+      return {
+        async readEntries(handle) {
+          await sleep(100);
+
+          if (!first) {
+            return handle([]);
+          }
+
+          first = false;
+          return handle(item.children.map(makeFileSystemEntry));
+        },
+      };
+    },
+  };
+  return ret;
+};
+
 const makeDataTransferItem = item => {
   return {
     webkitGetAsEntry: () => makeFileSystemEntry(item),
   };
 };
 
+const makeDataTransferItemAsync = item => {
+  return {
+    webkitGetAsEntry: () => makeFileSystemEntryAsync(item),
+  };
+};
+
 describe('uploader', () => {
   let requests;
   let xhr;
@@ -462,6 +495,46 @@ describe('uploader', () => {
       }, 100);
     });
 
+    it('dragging and dropping files to upload through asynchronous file reading is run normal', done => {
+      const input = uploader.container.querySelector('input')!;
+
+      const files = {
+        name: 'foo',
+        children: [
+          {
+            name: 'bar',
+            children: [
+              {
+                name: '1.png',
+              },
+              {
+                name: '2.png',
+              },
+              {
+                name: 'rc',
+                children: [
+                  {
+                    name: '5.webp',
+                  },
+                  {
+                    name: '4.webp',
+                  },
+                ],
+              },
+            ],
+          },
+        ],
+      };
+      fireEvent.drop(input, { dataTransfer: { items: [makeDataTransferItemAsync(files)] } });
+      const mockStart = jest.fn();
+      handlers.onStart = mockStart;
+
+      setTimeout(() => {
+        expect(mockStart.mock.calls.length).toBe(2);
+        done();
+      }, 500);
+    });
+
     it('unaccepted type files to upload will not trigger onStart when select directory', done => {
       const input = uploader.container.querySelector('input')!;
       const files = [