multiple selection drag and drop inside workbench

src/vs/base/browser/dnd.ts

@@ -49,6 +49,11 @@ export const DataTransfers = {
 	 */
 	URL: 'URL',
 
+	/**
+	 * Application specific resource transfer type when multiple resources are being dragged.
+	 */
+	URLS: 'URLS',
+
 	/**
 	 * Browser specific transfer type to download.
 	 */
@@ -58,4 +63,4 @@ export const DataTransfers = {
 	 * Typicaly transfer type for copy/paste transfers.
 	 */
 	TEXT: 'text/plain'
-};
\ No newline at end of file
+};

src/vs/workbench/browser/editor.ts

@@ -241,13 +241,19 @@ export function extractResources(e: DragEvent, externalOnly?: boolean): (IDragge
 
 			// Data Transfer: URL
 			else {
-				const rawURLData = e.dataTransfer.getData(DataTransfers.URL);
-				if (rawURLData) {
-					try {
-						resources.push({ resource: URI.parse(rawURLData), isExternal: false });
-					} catch (error) {
-						// Invalid URI
+				try {
+					const rawURLsData = e.dataTransfer.getData(DataTransfers.URLS);
+					if (rawURLsData) {
+						const uriStrArray: string[] = JSON.parse(rawURLsData);
+						resources.push(...uriStrArray.map(uriStr => ({ resource: URI.parse(uriStr), isExternal: false })));
+					} else {
+						const rawURLData = e.dataTransfer.getData(DataTransfers.URL);
+						if (rawURLData) {
+							resources.push({ resource: URI.parse(rawURLData), isExternal: false });
+						}
 					}
+				} catch (error) {
+					// Invalid URI
 				}
 			}
 		}
@@ -268,4 +274,4 @@ export function extractResources(e: DragEvent, externalOnly?: boolean): (IDragge
 	}
 
 	return resources;
-}
\ No newline at end of file
+}

src/vs/workbench/parts/files/electron-browser/views/explorerViewer.ts

@@ -726,13 +726,14 @@ export class FileDragAndDrop extends SimpleFileResourceDragAndDrop {
 			});
 
 			// Apply some datatransfer types to allow for dragging the element outside of the application
-			// TODO@Isidor check this
 			if (sources.length === 1) {
 				if (!sources[0].isDirectory) {
 					originalEvent.dataTransfer.setData(DataTransfers.DOWNLOAD_URL, [MIME_BINARY, sources[0].name, sources[0].resource.toString()].join(':'));
 				}
 
 				originalEvent.dataTransfer.setData(DataTransfers.TEXT, getPathLabel(sources[0].resource));
+			} else {
+				originalEvent.dataTransfer.setData(DataTransfers.URLS, JSON.stringify(sources.map(s => s.resource.toString())));
 			}
 		}
 	}