Feat:Can directly generate an agent node by dragging and dropping the connecting line (#9226) (#9357)

…e connecting line (#9226)

### What problem does this PR solve?

Can directly generate an agent node by dragging and dropping the
connecting line (#9226)

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

web/src/pages/agent/canvas/node/dropdown/next-step-dropdown.tsx

@@ -20,55 +20,111 @@ import { IModalProps } from '@/interfaces/common';
 import { Operator } from '@/pages/agent/constant';
 import { AgentInstanceContext, HandleContext } from '@/pages/agent/context';
 import OperatorIcon from '@/pages/agent/operator-icon';
+import { Position } from '@xyflow/react';
 import { lowerFirst } from 'lodash';
-import { PropsWithChildren, createContext, memo, useContext } from 'react';
+import {
+  PropsWithChildren,
+  createContext,
+  memo,
+  useContext,
+  useEffect,
+  useRef,
+} from 'react';
 import { useTranslation } from 'react-i18next';
 
-type OperatorItemProps = { operators: Operator[] };
+type OperatorItemProps = {
+  operators: Operator[];
+  isCustomDropdown?: boolean;
+  mousePosition?: { x: number; y: number };
+};
 
 const HideModalContext = createContext<IModalProps<any>['showModal']>(() => {});
+const OnNodeCreatedContext = createContext<
+  ((newNodeId: string) => void) | undefined
+>(undefined);
 
-function OperatorItemList({ operators }: OperatorItemProps) {
+function OperatorItemList({
+  operators,
+  isCustomDropdown = false,
+  mousePosition,
+}: OperatorItemProps) {
   const { addCanvasNode } = useContext(AgentInstanceContext);
-  const { nodeId, id, position } = useContext(HandleContext);
+  const handleContext = useContext(HandleContext);
   const hideModal = useContext(HideModalContext);
+  const onNodeCreated = useContext(OnNodeCreatedContext);
   const { t } = useTranslation();
 
-  return (
-    <ul className="space-y-2">
-      {operators.map((x) => {
-        return (
-          <Tooltip key={x}>
-            <TooltipTrigger asChild>
-              <DropdownMenuItem
-                key={x}
-                className="hover:bg-bg-card py-1 px-3 cursor-pointer rounded-sm flex gap-2 items-center justify-start"
-                onClick={addCanvasNode(x, {
-                  nodeId,
-                  id,
-                  position,
-                })}
-                onSelect={() => hideModal?.()}
-              >
-                <OperatorIcon name={x}></OperatorIcon>
-                {t(`flow.${lowerFirst(x)}`)}
-              </DropdownMenuItem>
-            </TooltipTrigger>
-            <TooltipContent side="right">
-              <p>{t(`flow.${lowerFirst(x)}Description`)}</p>
-            </TooltipContent>
-          </Tooltip>
-        );
-      })}
-    </ul>
-  );
+  const handleClick = (operator: Operator) => {
+    const contextData = handleContext || {
+      nodeId: '',
+      id: '',
+      type: 'source' as const,
+      position: Position.Right,
+      isFromConnectionDrag: true,
+    };
+
+    const mockEvent = mousePosition
+      ? {
+          clientX: mousePosition.x,
+          clientY: mousePosition.y,
+        }
+      : undefined;
+
+    const newNodeId = addCanvasNode(operator, contextData)(mockEvent);
+
+    if (onNodeCreated && newNodeId) {
+      onNodeCreated(newNodeId);
+    }
+
+    hideModal?.();
+  };
+
+  const renderOperatorItem = (operator: Operator) => {
+    const commonContent = (
+      <div className="hover:bg-background-card py-1 px-3 cursor-pointer rounded-sm flex gap-2 items-center justify-start">
+        <OperatorIcon name={operator} />
+        {t(`flow.${lowerFirst(operator)}`)}
+      </div>
+    );
+
+    return (
+      <Tooltip key={operator}>
+        <TooltipTrigger asChild>
+          {isCustomDropdown ? (
+            <li onClick={() => handleClick(operator)}>{commonContent}</li>
+          ) : (
+            <DropdownMenuItem
+              key={operator}
+              className="hover:bg-background-card py-1 px-3 cursor-pointer rounded-sm flex gap-2 items-center justify-start"
+              onClick={() => handleClick(operator)}
+              onSelect={() => hideModal?.()}
+            >
+              <OperatorIcon name={operator} />
+              {t(`flow.${lowerFirst(operator)}`)}
+            </DropdownMenuItem>
+          )}
+        </TooltipTrigger>
+        <TooltipContent side="right">
+          <p>{t(`flow.${lowerFirst(operator)}Description`)}</p>
+        </TooltipContent>
+      </Tooltip>
+    );
+  };
+
+  return <ul className="space-y-2">{operators.map(renderOperatorItem)}</ul>;
 }
 
-function AccordionOperators() {
+function AccordionOperators({
+  isCustomDropdown = false,
+  mousePosition,
+}: {
+  isCustomDropdown?: boolean;
+  mousePosition?: { x: number; y: number };
+}) {
   return (
     <Accordion
       type="multiple"
-      className="px-2 text-text-primary max-h-[45vh] overflow-auto"
+      className="px-2 text-text-title max-h-[45vh] overflow-auto"
       defaultValue={['item-1', 'item-2', 'item-3', 'item-4', 'item-5']}
     >
       <AccordionItem value="item-1">
@@ -76,6 +132,8 @@ function AccordionOperators() {
         <AccordionContent className="flex flex-col gap-4 text-balance">
           <OperatorItemList
             operators={[Operator.Agent, Operator.Retrieval]}
+            isCustomDropdown={isCustomDropdown}
+            mousePosition={mousePosition}
           ></OperatorItemList>
         </AccordionContent>
       </AccordionItem>
@@ -84,6 +142,8 @@ function AccordionOperators() {
         <AccordionContent className="flex flex-col gap-4 text-balance">
           <OperatorItemList
             operators={[Operator.Message, Operator.UserFillUp]}
+            isCustomDropdown={isCustomDropdown}
+            mousePosition={mousePosition}
           ></OperatorItemList>
         </AccordionContent>
       </AccordionItem>
@@ -96,6 +156,8 @@ function AccordionOperators() {
               Operator.Iteration,
               Operator.Categorize,
             ]}
+            isCustomDropdown={isCustomDropdown}
+            mousePosition={mousePosition}
           ></OperatorItemList>
         </AccordionContent>
       </AccordionItem>
@@ -106,6 +168,8 @@ function AccordionOperators() {
         <AccordionContent className="flex flex-col gap-4 text-balance">
           <OperatorItemList
             operators={[Operator.Code, Operator.StringTransform]}
+            isCustomDropdown={isCustomDropdown}
+            mousePosition={mousePosition}
           ></OperatorItemList>
         </AccordionContent>
       </AccordionItem>
@@ -129,6 +193,8 @@ function AccordionOperators() {
               Operator.Invoke,
               Operator.WenCai,
             ]}
+            isCustomDropdown={isCustomDropdown}
+            mousePosition={mousePosition}
           ></OperatorItemList>
         </AccordionContent>
       </AccordionItem>
@@ -139,9 +205,69 @@ function AccordionOperators() {
 export function InnerNextStepDropdown({
   children,
   hideModal,
-}: PropsWithChildren & IModalProps<any>) {
+  position,
+  onNodeCreated,
+}: PropsWithChildren &
+  IModalProps<any> & {
+    position?: { x: number; y: number };
+    onNodeCreated?: (newNodeId: string) => void;
+  }) {
+  const dropdownRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    if (position && hideModal) {
+      const handleKeyDown = (event: KeyboardEvent) => {
+        if (event.key === 'Escape') {
+          hideModal();
+        }
+      };
+
+      document.addEventListener('keydown', handleKeyDown);
+
+      return () => {
+        document.removeEventListener('keydown', handleKeyDown);
+      };
+    }
+  }, [position, hideModal]);
+
+  if (position) {
+    return (
+      <div
+        ref={dropdownRef}
+        style={{
+          position: 'fixed',
+          left: position.x,
+          top: position.y + 10,
+          zIndex: 1000,
+        }}
+        onClick={(e) => e.stopPropagation()}
+      >
+        <div className="w-[300px] font-semibold bg-white border border-border rounded-md shadow-lg">
+          <div className="px-3 py-2 border-b border-border">
+            <div className="text-sm font-medium">Next Step</div>
+          </div>
+          <HideModalContext.Provider value={hideModal}>
+            <OnNodeCreatedContext.Provider value={onNodeCreated}>
+              <AccordionOperators
+                isCustomDropdown={true}
+                mousePosition={position}
+              ></AccordionOperators>
+            </OnNodeCreatedContext.Provider>
+          </HideModalContext.Provider>
+        </div>
+      </div>
+    );
+  }
+
   return (
-    <DropdownMenu open onOpenChange={hideModal}>
+    <DropdownMenu
+      open={true}
+      onOpenChange={(open) => {
+        if (!open && hideModal) {
+          hideModal();
+        }
+      }}
+    >
       <DropdownMenuTrigger asChild>{children}</DropdownMenuTrigger>
       <DropdownMenuContent
         onClick={(e) => e.stopPropagation()}