Feat: Create Dropdown Button component (#840)

This PR introduces a new **DropdownButton** component that enables the
creation of interactive dropdown buttons in our application. The
dropdown button provides a user-friendly way to present multiple options
while maintaining a clean and compact interface.

src/backend/langflow/api/v1/users.py

@@ -43,7 +43,9 @@ def add_user(
         db.refresh(new_user)
     except IntegrityError as e:
         db.rollback()
-        raise HTTPException(status_code=400, detail="This username is unavailable.") from e
+        raise HTTPException(
+            status_code=400, detail="This username is unavailable."
+        ) from e
 
     return new_user
 

src/frontend/src/components/DropdownButtonComponent/index.tsx

@@ -0,0 +1,67 @@
+import { useState } from "react";
+import { dropdownButtonPropsType } from "../../types/components";
+import IconComponent from "../genericIconComponent";
+import { Button } from "../ui/button";
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from "../ui/dropdown-menu";
+
+export default function DropdownButton({
+  firstButtonName,
+  onFirstBtnClick,
+  options,
+}: dropdownButtonPropsType): JSX.Element {
+  const [showOptions, setShowOptions] = useState<boolean>(false);
+
+  return (
+    <div>
+      <DropdownMenu open={showOptions}>
+        <DropdownMenuTrigger asChild>
+          <Button
+            variant="primary"
+            className="relative pr-10"
+            onClick={(event) => {
+              event.stopPropagation();
+              event.preventDefault();
+              onFirstBtnClick();
+            }}
+          >
+            {firstButtonName}
+            <div
+              className="absolute right-2 items-center text-muted-foreground"
+              onClick={(event) => {
+                event.stopPropagation();
+                event.preventDefault();
+                setShowOptions(!showOptions);
+              }}
+            >
+              {!showOptions ? (
+                <IconComponent
+                  name="ChevronDown"
+                />
+              ) : (
+                <IconComponent name="ChevronUp" />
+              )}
+            </div>
+          </Button>
+        </DropdownMenuTrigger>
+        <DropdownMenuContent
+          onPointerDownOutside={(event) => {
+            event.stopPropagation();
+            event.preventDefault();
+            setShowOptions(!showOptions);
+          }}
+        >
+          {options.map(({ name, onBtnClick }, index) => (
+            <DropdownMenuItem onClick={onBtnClick} key={index}>
+              {name}
+            </DropdownMenuItem>
+          ))}
+        </DropdownMenuContent>
+      </DropdownMenu>
+    </div>
+  );
+}

src/frontend/src/contexts/tabsContext.tsx

@@ -48,7 +48,7 @@ const TabsContextInitialValue: TabsContextType = {
   downloadFlow: (flow: FlowType) => {},
   downloadFlows: () => {},
   uploadFlows: () => {},
-  uploadFlow: () => {},
+  uploadFlow: async () => "",
   isBuilt: false,
   setIsBuilt: (state: boolean) => {},
   hardReset: () => {},
@@ -298,39 +298,38 @@ export function TabsProvider({ children }: { children: ReactNode }) {
    * If the file type is application/json, the file is read and parsed into a JSON object.
    * The resulting JSON object is passed to the addFlow function.
    */
-  function uploadFlow(newProject?: boolean, file?: File) {
+  async function uploadFlow(
+    newProject?: boolean,
+    file?: File
+  ): Promise<String | undefined> {
+    let id;
     if (file) {
-      file.text().then((text) => {
+      let text = await file.text();
       // parse the text into a JSON object
       let flow: FlowType = JSON.parse(text);
 
-        addFlow(flow, newProject);
+      id = await addFlow(flow, newProject);
-      });
     } else {
       // create a file input
       const input = document.createElement("input");
       input.type = "file";
       input.accept = ".json";
       // add a change event listener to the file input
-      input.onchange = (e: Event) => {
+      id = await new Promise(resolve => {
-        // check if the file type is application/json
+        input.onchange = async (e: Event) => {
-        if (
+          if ((e.target as HTMLInputElement).files![0].type === "application/json") {
-          (e.target as HTMLInputElement).files![0].type === "application/json"
-        ) {
-          // get the file from the file input
             const currentfile = (e.target as HTMLInputElement).files![0];
-          // read the file as text
+            let text = await currentfile.text();
-          currentfile.text().then((text) => {
-            // parse the text into a JSON object
             let flow: FlowType = JSON.parse(text);
-
+            const flowId = await addFlow(flow, newProject);
-            addFlow(flow, newProject);
+            resolve(flowId);
-          });
           }
         };
         // trigger the file input click event to open the file dialog
         input.click();
+      });
     }
+    return id;
   }
 
   function uploadFlows() {

src/frontend/src/pages/AdminPage/index.tsx

@@ -4,6 +4,7 @@ import { useContext, useEffect, useRef, useState } from "react";
 import PaginatorComponent from "../../components/PaginatorComponent";
 import ShadTooltip from "../../components/ShadTooltipComponent";
 import IconComponent from "../../components/genericIconComponent";
+import Header from "../../components/headerComponent";
 import { Button } from "../../components/ui/button";
 import { Checkbox } from "../../components/ui/checkbox";
 import { Input } from "../../components/ui/input";
@@ -25,9 +26,8 @@ import {
 } from "../../controllers/API";
 import ConfirmationModal from "../../modals/ConfirmationModal";
 import UserManagementModal from "../../modals/UserManagementModal";
-import { UserInputType } from "../../types/components";
-import Header from "../../components/headerComponent";
 import { Users } from "../../types/api";
+import { UserInputType } from "../../types/components";
 
 export default function AdminPage() {
   const [inputValue, setInputValue] = useState("");
@@ -280,7 +280,8 @@ export default function AdminPage() {
                         </TableHeader>
                         {!loadingUsers && (
                           <TableBody>
-                          {filterUserList.map((user:UserInputType, index) => (
+                            {filterUserList.map(
+                              (user: UserInputType, index) => (
                                 <TableRow key={index}>
                                   <TableCell className="truncate py-2 font-medium">
                                     <ShadTooltip content={user.id}>
@@ -396,7 +397,10 @@ export default function AdminPage() {
                                           handleDeleteUser(user);
                                         }}
                                       >
-                                    <ShadTooltip content="Delete" side="top">
+                                        <ShadTooltip
+                                          content="Delete"
+                                          side="top"
+                                        >
                                           <IconComponent
                                             name="Trash2"
                                             className="ml-2 h-4 w-4 cursor-pointer"
@@ -406,7 +410,8 @@ export default function AdminPage() {
                                     </div>
                                   </TableCell>
                                 </TableRow>
-                          ))}
+                              )
+                            )}
                           </TableBody>
                         )}
                       </Table>

src/frontend/src/pages/MainPage/index.tsx

@@ -7,6 +7,7 @@ import { SkeletonCardComponent } from "../../components/skeletonCardComponent";
 import { Button } from "../../components/ui/button";
 import { USER_PROJECTS_HEADER } from "../../constants/constants";
 import { TabsContext } from "../../contexts/tabsContext";
+import DropdownButton from "../../components/DropdownButtonComponent";
 export default function HomePage(): JSX.Element {
   const {
     flows,
@@ -14,9 +15,12 @@ export default function HomePage(): JSX.Element {
     downloadFlows,
     uploadFlows,
     addFlow,
-    removeFlow,
+    removeFlow, uploadFlow,
     isLoading,
   } = useContext(TabsContext);
+  const dropdownOptions = [{name: "Import from JSON", onBtnClick: () => uploadFlow(true).then((id) => {
+    navigate("/flow/" + id);
+  })}]
 
   // Set a null id
   useEffect(() => {
@@ -57,17 +61,15 @@ export default function HomePage(): JSX.Element {
               <IconComponent name="Upload" className="main-page-nav-button" />
               Upload Collection
             </Button>
-            <Button
+            <DropdownButton
-              variant="primary"
+              firstButtonName="New Project"
-              onClick={() => {
+              onFirstBtnClick={() => {
                 addFlow(null!, true).then((id) => {
                   navigate("/flow/" + id);
                 });
               }}
-            >
+              options={dropdownOptions}
-              <IconComponent name="Plus" className="main-page-nav-button" />
+            />
-              New Project
-            </Button>
           </div>
         </div>
         <span className="main-page-description-text">

src/frontend/src/pages/loginPage/index.tsx

@@ -19,7 +19,8 @@ export default function LoginPage(): JSX.Element {
     useState<loginInputStateType>(CONTROL_LOGIN_STATE);
 
   const { password, username } = inputState;
-  const { login, getAuthentication, setUserData, setIsAdmin } = useContext(AuthContext);
+  const { login, getAuthentication, setUserData, setIsAdmin } =
+    useContext(AuthContext);
   const navigate = useNavigate();
   const { setErrorData } = useContext(alertContext);
 

src/frontend/src/types/components/index.ts

@@ -544,3 +544,9 @@ export type fetchErrorComponentType = {
   message: string;
   description: string;
 };
+
+export type dropdownButtonPropsType = {
+  firstButtonName: string;
+  onFirstBtnClick: () => void;
+  options: Array<{ name: string; onBtnClick: () => void; }>;
+};

src/frontend/src/types/tabs/index.ts

@@ -24,7 +24,7 @@ export type TabsContextType = {
   uploadFlows: () => void;
   isBuilt: boolean;
   setIsBuilt: (state: boolean) => void;
-  uploadFlow: (newFlow?: boolean, file?: File) => void;
+  uploadFlow: (newFlow?: boolean, file?: File) => Promise<String | undefined>;
   hardReset: () => void;
   getNodeId: (nodeType: string) => string;
   tabsState: TabsState;

src/frontend/src/utils/styleUtils.ts

@@ -5,6 +5,7 @@ import {
   ChevronDown,
   ChevronLeft,
   ChevronRight,
+  ChevronUp,
   ChevronsLeft,
   ChevronsRight,
   ChevronsUpDown,
@@ -300,4 +301,5 @@ export const nodeIconsLucide: iconsType = {
   UserCog2,
   Key,
   Unplug,
+  ChevronUp,
 };